GDI+: Graphics Examples

[José Roca]

 
The IGdipGraphics interface provides methods for drawing lines, curves, figures, images, and text. A Graphics object stores attributes of the display device and attributes of the items to be drawn.

[José Roca]

 
The following example draws a 90-degree arc.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawArc.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws a 90-degree arc.
' ========================================================================================
SUB Example_DrawArc (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Set up the arc.
'   Pen redPen(Color(255, 255, 0, 0), 3);
'   REAL x = 0;
'   REAL y = 0;
'   REAL width = 200.0f;
'   REAL height = 100.0f;
'   REAL startAngle = 0.0f;
'   REAL sweepAngle = 90.0f;
   LOCAL redPen AS IGdipPen
   redPen = pGdip.Pen(pGdip.Color(255, 255, 0, 0), 3)
   LOCAL x, y, nWidth, nHeight, startAngle, sweepAngle AS SINGLE
   x = 0
   y = 0
   nWidth = 200.0!
   nHeight = 100.0!
   startAngle = 0.0!
   sweepAngle = 90.0!

'  // Draw the arc.
'   graphics.DrawArc(&redPen, x, y, width, height, startAngle, sweepAngle);
   graphics.DrawArc(redPen, x, y, nWidth, nHeight, startAngle, sweepAngle)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw arc", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 400, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawArc(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws a Bézier curve.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawBezier.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws a Bézier curve.
' ========================================================================================
SUB Example_DrawBezier (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Set up the pen and curve points.
'   Pen greenPen(Color(255, 0, 255, 0));
'   REAL startPointx = 100.0f;
'   REAL startPointy = 100.0f;
'   REAL ctrlPoint1x = 200.0f;
'   REAL ctrlPoint1y = 10.0f;
'   REAL ctrlPoint2x = 350.0f;
'   REAL ctrlPoint2y = 50.0f;
'   REAL endPointx = 500.0f;
'   REAL endPointy = 100.0f;

   LOCAL greenPen AS IGdipPen
   greenPen = pGdip.Pen(pGdip.Color(255, 0, 255, 0))
   LOCAL startPointx, startPointy, ctrlPoint1x, ctrlPoint1y, ctrlPoint2x, ctrlPoint2y, endPointx, endPointy AS SINGLE
   startPointx = 100.0!
   startPointy = 100.0!
   ctrlPoint1x = 200.0!
   ctrlPoint1y = 10.0!
   ctrlPoint2x = 350.0!
   ctrlPoint2y = 50.0!
   endPointx = 500.0!
   endPointy = 100.0!

'   // Draw the curve.
'   graphics.DrawBezier(
'   &greenPen,
'   startPointx,
'   startPointy,
'   ctrlPoint1x,
'   ctrlPoint1y,
'   ctrlPoint2x,
'   ctrlPoint2y,
'   endPointx,
'   endPointy);

   graphics.DrawBezier(greenPen, startPointx, startPointy, ctrlPoint1x, ctrlPoint1y, _
                       ctrlPoint2x, ctrlPoint2y, endPointx, endPointy)

'   // Draw the end points and control points.
'   SolidBrush redBrush(Color(255, 255, 0, 0));
'   SolidBrush blueBrush(Color(255, 0, 0, 255));
'   graphics.FillEllipse(&redBrush, 100 - 5, 100 - 5, 10, 10);
'   graphics.FillEllipse(&redBrush, 500 - 5, 100 - 5, 10, 10);
'   graphics.FillEllipse(&blueBrush, 200 - 5, 10 - 5, 10, 10);
'   graphics.FillEllipse(&blueBrush, 350 - 5, 50 - 5, 10, 10);

   LOCAL redBrush AS IGdipSolidBrush
   redBrush = pGdip.SolidBrush(pGdip.Color(255, 255, 0, 0))
   LOCAL blueBrush AS IGdipSolidBrush
   blueBrush = pGdip.SolidBrush(pGdip.Color(255, 0, 0, 255))
   graphics.FillEllipse(redBrush, 100 - 5, 100 - 5, 10, 10)
   graphics.FillEllipse(redBrush, 500 - 5, 100 - 5, 10, 10)
   graphics.FillEllipse(blueBrush, 200 - 5, 10 - 5, 10, 10)
   graphics.FillEllipse(blueBrush, 350 - 5, 50 - 5, 10, 10)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw bezier", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 600, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawBezier(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws a pair of Bézier curves.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawBeziers.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws a pair of Bézier curves.
' ========================================================================================
SUB Example_DrawBeziers (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Define a Pen object and an array of PointF objects.
'   Pen greenPen(Color(255, 0, 255, 0), 3);
   LOCAL greenPen AS IGdipPen
   greenPen = pGdip.Pen(pGdip.Color(255, 0, 255, 0))

'   PointF startPoint(100.0f, 100.0f);
'   PointF ctrlPoint1(200.0f, 50.0f);
'   PointF ctrlPoint2(400.0f, 10.0f);
'   PointF endPoint1(500.0f, 100.0f);
'   PointF ctrlPoint3(600.0f, 200.0f);
'   PointF ctrlPoint4(700.0f, 400.0f);
'   PointF endPoint2(500.0f, 500.0f);

   LOCAL startPoint, ctrlPoint1, ctrlPoint2, ctrlPoint3, ctrlPoint4, endPoint1, endPoint2 AS PointF
   startPoint = pGdip.PointF(100.0!, 100.0!)
   ctrlPoint1 = pGdip.PointF(200.0!, 50.0!)
   ctrlPoint2 = pGdip.PointF(400.0!, 10.0!)
   endPoint1  = pGdip.PointF(500.0!, 100.0!)
   ctrlPoint3 = pGdip.PointF(600.0!, 200.0!)
   ctrlPoint4 = pGdip.PointF(700.0!, 400.0!)
   endPoint2  = pGdip.PointF(500.0!, 500.0!)

'   PointF curvePoints[7] = {
'      startPoint,
'      ctrlPoint1,
'      ctrlPoint2,
'      endPoint1,
'      ctrlPoint3,
'      ctrlPoint4,
'      endPoint2};

   DIM curvePoints(6) AS PointF
   curvePoints(0) = startPoint
   curvePoints(1) = ctrlPoint1
   curvePoints(2) = ctrlPoint2
   curvePoints(3) = endPoint1
   curvePoints(4) = ctrlPoint3
   curvePoints(5) = ctrlPoint4
   curvePoints(6) = endPoint2

'   // Draw the Bezier curves.
'   graphics.DrawBeziers(&greenPen, curvePoints, 7);
   graphics.DrawBeziers(greenPen, curvePoints(0), 7)

'   // Draw the control and end points.
'   SolidBrush redBrush(Color(255, 255, 0, 0));
'   graphics.FillEllipse(&redBrush, Rect(100 - 5, 100 - 5, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(500 - 5, 100 - 5, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(500 - 5, 500 - 5, 10, 10));
'   SolidBrush blueBrush(Color(255, 0, 0, 255));
'   graphics.FillEllipse(&blueBrush, Rect(200 - 5, 50 - 5, 10, 10));
'   graphics.FillEllipse(&blueBrush, Rect(400 - 5, 10 - 5, 10, 10));
'   graphics.FillEllipse(&blueBrush, Rect(600 - 5, 200 - 5, 10, 10));
'   graphics.FillEllipse(&blueBrush, Rect(700 - 5, 400 - 5, 10, 10));

   LOCAL redBrush AS IGdipSolidBrush
   redBrush = pGdip.SolidBrush(pGdip.Color(255, 255, 0, 0))
   graphics.FillEllipse(redBrush, 100 - 5, 100 - 5, 10, 10)
   graphics.FillEllipse(redBrush, 500 - 5, 100 - 5, 10, 10)
   graphics.FillEllipse(redBrush, 500 - 5, 500 - 5, 10, 10)
   LOCAL blueBrush AS IGdipSolidBrush
   blueBrush = pGdip.SolidBrush(pGdip.Color(255, 0, 0, 255))
   graphics.FillEllipse(blueBrush, 200 - 5, 50 - 5, 10, 10)
   graphics.FillEllipse(blueBrush, 400 - 5, 10 - 5, 10, 10)
   graphics.FillEllipse(blueBrush, 600 - 5, 200 - 5, 10, 10)
   graphics.FillEllipse(blueBrush, 700 - 5, 400 - 5, 10, 10)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw beziers", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 800, 530
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawBeziers(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws a closed cardinal spline.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawClosedCurve.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws a closed cardinal spline.
' ========================================================================================
SUB Example_DrawClosedCurve (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Define a Pen object and an array of PointF objects.
'   Pen greenPen(Color(255, 0, 255, 0), 3);
   LOCAL greenPen AS IGdipPen
   greenPen = pGdip.Pen(pGdip.Color(255, 0, 255, 0), 3)

'   PointF point1(100.0f, 100.0f);
'   PointF point2(200.0f, 50.0f);
'   PointF point3(400.0f, 10.0f);
'   PointF point4(500.0f, 100.0f);
'   PointF point5(600.0f, 200.0f);
'   PointF point6(700.0f, 400.0f);
'   PointF point7(500.0f, 500.0f);

   LOCAL point1, point2, point3, point4, point5, point6, point7 AS PointF
   point1 = pGdip.PointF(100.0!, 100.0!)
   point2 = pGdip.PointF(200.0!, 50.0!)
   point3 = pGdip.PointF(400.0!, 10.0!)
   point4 = pGdip.PointF(500.0!, 100.0!)
   point5 = pGdip.PointF(600.0!, 200.0!)
   point6 = pGdip.PointF(700.0!, 400.0!)
   point7 = pGdip.PointF(500.0!, 500.0!)

'   PointF curvePoints[7] = {
'      point1,
'      point2,
'      point3,
'      point4,
'      point5,
'      point6,
'      point7};

   DIM curvePoints(6) AS PointF
   curvePoints(0) = point1
   curvePoints(1) = point2
   curvePoints(2) = point3
   curvePoints(3) = point4
   curvePoints(4) = point5
   curvePoints(5) = point6
   curvePoints(6) = point7

'   // Draw the closed curve.
'   graphics.DrawClosedCurve(&greenPen, curvePoints, 7, 1.0);
   graphics.DrawClosedCurve(greenPen, curvePoints(0), 7, 1.0)

'   // Draw the points in the curve.
'   SolidBrush redBrush(Color(255, 255, 0, 0));
'   graphics.FillEllipse(&redBrush, Rect(95, 95, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(495, 95, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(495, 495, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(195, 45, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(395, 5, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(595, 195, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(695, 395, 10, 10));

   LOCAL redBrush AS IGdipSolidBrush
   redBrush = pGdip.SolidBrush(pGdip.Color(255, 255, 0, 0))
   graphics.FillEllipse(redBrush, 95, 95, 10, 10)
   graphics.FillEllipse(redBrush, 495, 95, 10, 10)
   graphics.FillEllipse(redBrush, 495, 495, 10, 10)
   graphics.FillEllipse(redBrush, 195, 45, 10, 10)
   graphics.FillEllipse(redBrush, 395, 5, 10, 10)
   graphics.FillEllipse(redBrush, 595, 195, 10, 10)
   graphics.FillEllipse(redBrush, 695, 395, 10, 10)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw closed curve", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 800, 545
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawClosedCurve(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws a cardinal spline.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawCurve.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws a cardinal spline.
' ========================================================================================
SUB Example_DrawCurve (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Define a Pen object and an array of Point objects.
'   Pen greenPen(Color::Green, 3);
'   PointF point1(100.0f, 100.0f);
'   PointF point2(200.0f, 50.0f);
'   PointF point3(400.0f, 10.0f);
'   PointF point4(500.0f, 100.0f);

   LOCAL greenPen AS IGdipPen
   greenPen = pGdip.Pen(%ARGB_Green, 3)
   LOCAL point1, point2, point3, point4 AS PointF
   point1 = pGdip.PointF(100.0!, 100.0!)
   point2 = pGdip.PointF(200.0!, 50.0!)
   point3 = pGdip.PointF(400.0!, 10.0!)
   point4 = pGdip.PointF(500.0!, 100.0!)

'   PointF curvePoints[4] = {
'   point1,
'   point2,
'   point3,
'   point4};

   DIM curvePoints(3) AS PointF
   curvePoints(0) = point1
   curvePoints(1) = point2
   curvePoints(2) = point3
   curvePoints(3) = point4

'   // Draw the curve.
'   graphics.DrawCurve(&greenPen, curvePoints, 4);
   graphics.DrawCurve(greenPen, curvePoints(0), 4)

'   // Draw the points in the curve.
'   SolidBrush redBrush(Color::Red);
'   graphics.FillEllipse(&redBrush, Rect(95, 95, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(195, 45, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(395, 5, 10, 10));
'   graphics.FillEllipse(&redBrush, Rect(495, 95, 10, 10));

   LOCAL redBrush AS IGdipSolidBrush
   redBrush = pGdip.SolidBrush(pGdip.Color(255, 255, 0, 0))
   graphics.FillEllipse(redBrush, 95, 95, 10, 10)
   graphics.FillEllipse(redBrush, 195, 45, 10, 10)
   graphics.FillEllipse(redBrush, 395, 5, 10, 10)
   graphics.FillEllipse(redBrush, 495, 95, 10, 10)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw bezier", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 600, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawCurve(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws an ellipse.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawEllipse.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws an ellipse.
' ========================================================================================
SUB Example_DrawEllipse (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Create a Pen object.
'   Pen bluePen(Color(255, 0, 0, 255));
   LOCAL bluePen AS IGdipPen
   bluePen = pGdip.Pen(pGdip.Color(255, 0, 0, 255), 3)

'   // Initialize the variables that define the ellipse.
'   REAL x = 100.0f;
'   REAL y = 70.0f;
'   REAL width = 200.0f;
'   REAL height = 100.0f;
   LOCAL x, y, nWidth, nHeight AS SINGLE
   x = 100.0!
   y = 70.0!
   nWidth = 200.0!
   nHeight = 100.0!

'   // Draw the ellipse.
'   graphics.DrawEllipse(&bluePen, x, y, width, height);
   graphics.DrawEllipse(bluePen, x, y, nWidth, nHeight)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw ellipse", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 400, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawEllipse(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws an image.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawImage.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws an image.
' ========================================================================================
SUB Example_DrawImage (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Create an Image object.
'   Image image(L"climber.jpg");
   LOCAL pImage AS IGdipImage
   pImage = pGdip.Image("climber.jpg")

'   // Draw the original source image.
'   graphics.DrawImage(&image, 10, 10);
   graphics.DrawImage(pImage, 10, 10)

'   // Draw the scaled image.
'   graphics.DrawImage(&image, 200.0f, 50.0f, 150.0f, 75.0f);
   graphics.DrawImage(pImage, 200, 50, 150, 75)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw image", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 400, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawImage(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws a portion of an image. The portion of the source image to be drawn is scaled to fit a specified parallelogram.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawImagePointRect.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws a portion of an image. The portion of the source image to be
' drawn is scaled to fit a specified parallelogram.
' ========================================================================================
SUB Example_DrawImage (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Create an Image object.
'   Image image(L"climber.jpg");
   LOCAL pImage AS IGdipImage
   pImage = pGdip.Image("climber.jpg")

'   // Draw the original source image.
'   graphics.DrawImage(&image, 10, 10);
   graphics.DrawImage(pImage, 10, 10)

'   // Set up the location for the image and the portion of the source to draw.
'   REAL x = 200.0f;
'   REAL y = 30.0f;
'   REAL srcx = 70.0f;
'   REAL srcy = 20.0f;
'   REAL srcwidth = 100.0f;
'   REAL srcheight = 200.0f;
'   Unit srcunit = UnitPixel;
   LOCAL x, y, srcx, srcy, srcwidth, srcheight AS SINGLE
   LOCAL srcunit AS LONG
   x = 200.0!
   y = 30.0!
   srcx = 70.0!
   srcy = 20.0!
   srcwidth = 100.0!
   srcheight = 200.0!
   srcunit = %UnitPixel

'   // Draw the image.
'   graphics.DrawImage(&image, x, y, srcx, srcy, srcwidth, srcheight, srcunit);
   graphics.DrawImagePointRect(pImage, x, y, srcx, srcy, srcwidth, srcheight, srcunit)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "DrawImagePointRect", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 400, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawImage(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws an image.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawImagePoints.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws an image.
' ========================================================================================
SUB Example_DrawImagePoints (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Create an Image object.
'   Image image(L"climber.jpg");
   LOCAL pImage AS IGdipImage
   pImage = pGdip.Image("climber.jpg")

'   // Create an array of PointF objects that specify the destination of the image.
'   PointF destPoints[3] = {
'   PointF(30.0f, 30.0f),
'   PointF(250.0f, 50.0f),
'   PointF(175.0f, 120.0f)};
   DIM destPoints(2) AS PointF
   destPoints(0) = pGdip.PointF(30, 30)
   destPoints(1) = pGdip.PointF(250, 50)
   destPoints(2) = pGdip.PointF(175, 120)

'   PointF* pdestPoints = destPoints;
'   // Draw the image.
'   graphics.DrawImage(&image, pdestPoints, 3);
   graphics.DrawImagePoints(pImage, destPoints(0), 3)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "DrawImagePoints", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 400, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawImagePoints(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws the original source image and then draws a portion of the image in a specified parallelogram.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawImageRectRect.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws the original source image and then draws a portion of the
' image in a specified parallelogram.
' ========================================================================================
SUB Example_DrawImageRectRect (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Create an Image object.
'   Image image(L"pattern.png");
   LOCAL pImage AS IGdipImage
   pImage = pGdip.Image("pattern.png")

'   // Draw the original source image.
'   graphics.DrawImage(&image, 10, 10);
   graphics.DrawImage(pImage, 10, 10)

'   // Define the portion of the image to draw.
'   REAL srcX = 70.0f;
'   REAL srcY = 20.0f;
'   REAL srcWidth = 100.0f;
'   REAL srcHeight = 100.0f;
   LOCAL srcX, srcY, srcWidth, srcHeight AS SINGLE
   srcX = 70.0!
   srcY = 20.0!
   srcWidth = 100.0!
   srcHeight = 100.0!

'   // Create an array of Point objects that specify the destination of the cropped image.
'   PointF destPoints[3] = {
'   PointF(230.0f, 30.0f),
'   PointF(350.0f, 50.0f),
'   PointF(275.0f, 120.0f)};
   DIM destPoints(2) AS PointF
   destPoints(0) = pGdip.PointF(230, 30)
   destPoints(1) = pGdip.PointF(350, 50)
   destPoints(2) = pGdip.PointF(275, 120)

'   Point* pdestPoints = destPoints;

'   // Create an ImageAttributes object that specifies a recoloring from red to blue.
'   ImageAttributes remapAttributes;
'   ColorMap redToBlue;
'   redToBlue.oldColor = Color(255, 255, 0, 0);
'   redToBlue.newColor = Color(255, 0, 0, 255);
'   remapAttributes.SetRemapTable(1, &redToBlue);
   LOCAL remapAttributes AS IGdipImageAttributes
   remapAttributes = pGdip.ImageAttributes
   LOCAL redToBlue AS ColorMap
   redToBlue.oldColor = pGdip.Color(255, 255, 0, 0)
   redToBlue.newColor = pGdip.Color(255, 0, 0, 255)
   remapAttributes.SetRemapTable(1, redToBlue)

'   // Draw the cropped image.
'   graphics.DrawImage(
'   &image,
'   pdestPoints,
'   3,
'   srcX,
'   srcY,
'   srcWidth,
'   srcHeight,
'   UnitPixel,
'   &remapAttributes,
'   NULL,
'   NULL);

   graphics.DrawImagePointsRect(pImage, destPoints(0), 3, srcX, srcY, srcWidth, srcHeight, _
                                %UnitPixel, remapAttributes, %NULL, %NULL)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "DrawImagePointRect", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 400, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawImageRectRect(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws a line.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawLine.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws a line.
' ========================================================================================
SUB Example_DrawLine (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Create a Pen object.
'   Pen blackPen(Color(255, 0, 0, 0), 3);
   LOCAL blackPen AS IGdipPen
   blackPen = pGdip.Pen(pGdip.Color(255, 0, 0, 0), 3)

'   // Initialize the coordinates of the points that define the line.
'   REAL x1 = 100.0f;
'   REAL y1 = 100.0f;
'   REAL x2 = 500.0f;
'   REAL y2 = 100.0f;
   LOCAL x1, y1,x2, y2 AS SINGLE
   x1 = 100.0! : y1 = 100.0! : x2 = 500.0! : y2 = 100.0!

'   // Draw the line.
'   graphics.DrawLine(&blackPen, x1, y1, x2, y2);
   graphics.DrawLine(blackPen, x1, y1, x2, y2)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw line", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 600, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawLine(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws a sequence of connected lines.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawLines.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws a sequence of connected lines.
' ========================================================================================
SUB Example_DrawLines (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Create a Pen object.
'   Pen blackPen(Color(255, 0, 0, 0), 3);
   LOCAL blackPen AS IGdipPen
   blackPen = pGdip.Pen(pGdip.Color(255, 0, 0, 0), 3)

'   // Create an array of PointF objects that define the lines to draw.
'   PointF point1(10.0f, 10.0f);
'   PointF point2(10.0f, 100.0f);
'   PointF point3(200.0f, 50.0f);
'   PointF point4(250.0f, 300.0f);
   LOCAL point1, point2, point3, point4 AS PointF
   point1 = pGdip.PointF(10, 10)
   point2 = pGdip.PointF(10, 100)
   point3 = pGdip.PointF(200, 50)
   point4 = pGdip.PointF(250, 300)

'   PointF points[4] = {point1, point2, point3, point4};
'   PointF* pPoints = points;
   DIM pts(3) AS PointF
   pts(0) = point1
   pts(1) = point2
   pts(2) = point3
   pts(3) = point4

'   // Draw the lines.
'   graphics.DrawLines(&blackPen, pPoints, 4);
   graphics.DrawLines(blackPen, pts(0), 4)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw line", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 400, 320
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawLines(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws a GraphicsPath object.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawPath.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws a GraphicsPath object.
' ========================================================================================
SUB Example_DrawPath (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Create a GraphicsPath, and add an ellipse.
'   GraphicsPath ellipsePath;
'   ellipsePath.AddEllipse(Rect(100, 70, 200, 100));
   LOCAL ellipsePath AS IGdipGraphicsPath
   ellipsePath = pGdip.GraphicsPath
   ellipsePath.AddEllipse(100, 70, 200, 100)

'   // Create a Pen object.
'   Pen blackPen(Color(255, 0, 0, 0), 3);
   LOCAL blackPen AS IGdipPen
   blackPen = pGdip.Pen(pGdip.Color(255, 0, 0, 0), 3)

'   // Draw ellipsePath.
'   graphics.DrawPath(&blackPen, &ellipsePath);
   graphics.DrawPath(blackPen, ellipsePath)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw path", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 400, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawPath(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


[José Roca]

 
The following example draws a pie.

Code Select Expand


' ########################################################################################
' Microsoft Windows
' File: CGDIP_DrawPie.bas
' Contents: GDI+ example
' This version uses the CWindow and CGdiPlus classes, and the GraphCtx graphic control
' Compilers: PBWIN 10+, PBCC 6+
' Headers: Windows API headers 2.03+
' Copyright (c) 2011 José Roca. Freeware. Use at your own risk.
' Portions Copyright (c) Microsoft Corporation. All Rights Reserved.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################

#COMPILE EXE
#DIM ALL
%UNICODE = 1
%USEGRAPHCTX = 1

' // Header files for imported files
#INCLUDE ONCE "CWindow.inc"    ' // CWindow class
#INCLUDE ONCE "CGdiPlus.inc"   ' // CGdiPlus class

%IDC_GRCTX = 1001

' ========================================================================================
' The following example draws a pie.
' ========================================================================================
SUB Example_DrawPie (BYVAL pGdip AS IGdiPlus, BYVAL hdc AS DWORD)

'   Graphics graphics(hdc);
   LOCAL graphics AS IGdipGraphics
   graphics = pGdip.Graphics(hdc)

'   // Create a Pen object.
'   Pen blackPen(Color(255, 0, 0, 0), 3);
   LOCAL blackPen AS IGdipPen
   blackPen = pGdip.Pen(pGdip.Color(255, 0, 0, 0), 3)

'   // Define the pie.
'   REAL x = 0.0f;
'   REAL y = 0.0f;
'   REAL width = 200.0f;
'   REAL height = 100.0f;
'   REAL startAngle = 0.0f;
'   REAL sweepAngle = 45.0f;
   LOCAL x, y, nWidth, nHeight, startAngle, sweepAngle AS SINGLE
   x = 0.0!
   y = 0.0!
   nWidth = 200.0!
   nHeight = 100.0!
   startAngle = 0.0!
   sweepAngle = 45.0!

'   // Draw the pie.
'   graphics.DrawPie(&blackPen, x, y, width, height, startAngle, sweepAngle);
   graphics.DrawPie(blackPen, x, y, nWidth, nHeight, startAngle, sweepAngle)

END SUB
' ========================================================================================

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the CWindow class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   LOCAL hwnd AS DWORD
   hwnd = pWindow.CreateWindow(%NULL, "Draw pie", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   pWindow.SetClientSize 400, 250
   ' // Center the window
   pWindow.CenterWindow

   ' // Create an instance of the GdiPlus class
   LOCAL pGdip AS IGdiPlus
   pGdip = NewGdiPlus

   ' // Add a GDI+ aware graphic control
   LOCAL hCtrl AS DWORD
   hCtrl = pWindow.AddGraphCtx(hwnd, %IDC_GRCTX, "", 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)
   GraphCtx_Clear(hCtrl, %WHITE)

   ' // Get the memory device context of the graphic control
   LOCAL hdc AS DWORD
   hdc = GraphCtx_GetDc(hCtrl)

   ' // Draw the graphics
   Example_DrawPie(pGdip, hdc)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   SELECT CASE uMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
               END IF
         END SELECT

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================