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GDI+: GdipCombineRegionRegion

Started by José Roca, June 25, 2008, 02:52:13 PM

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José Roca

June 25, 2008, 02:52:13 PM Last Edit: August 07, 2011, 09:54:25 PM by José Roca


The following example creates two regions, one from a path and the other from a rectangle. The code then uses the rectangular region to update the path region. The updated region is the union of the two regions.

C++

Code Select

VOID Example_UnionReg(HDC hdc)
{
   Graphics graphics(hdc);

   Point points[] = {
      Point(110, 20),
      Point(120, 30),
      Point(100, 60),
      Point(120, 70),
      Point(150, 60),
      Point(140, 10)};

   Rect rect(65, 15, 70, 45);
   GraphicsPath path;
   SolidBrush solidBrush(Color(255, 255, 0, 0));

   path.AddClosedCurve(points, 6);

   // Create a region from a path.
   Region pathRegion(&path);

   // Create a region from a rectangle.
   Region rectRegion(rect);

   // Form the union of the two regions.
   pathRegion.Union(&rectRegion);

   graphics.FillRegion(&solidBrush, &pathRegion);
}


PowerBASIC

Code Select

SUB GDIP_CombineRegionRegion (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pPath AS DWORD
   LOCAL pSolidBrush AS DWORD
   LOCAL pPathRegion AS DWORD
   LOCAL pRectRegion AS DWORD
   LOCAL rc AS RECTL
   DIM   pts(5) AS POINTL

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 255, 0, 0), pSolidBrush)

   pts(0).x = 110 : pts(0).y = 20
   pts(1).x = 120 : pts(1).y = 30
   pts(2).x = 100 : pts(2).y = 60
   pts(3).x = 120 : pts(3).y = 70
   pts(4).x = 150 : pts(4).y = 60
   pts(5).x = 140 : pts(5).y = 10

   SetRect rc, 65, 15, 70, 45
   hStatus = GdipCreatePath(%FillModeAlternate, pPath)

   hStatus = GdipAddPathClosedCurveI(pPath, pts(0), 6)

   ' // Create a region from a path.
   hStatus = GdipCreateRegionPath(pPath, pPathRegion)

   ' // Create a region from a rectangle.
   hStatus = GdipCreateRegionRectI(rc, pRectRegion)

   ' // Form the union of the region and a rectangle.
   hStatus = GdipCombineRegionRegion(pPathRegion, pRectRegion, %CombineModeUnion)

   ' // Fill the union of the two regions with a semitransparent blue brush.
   hStatus = GdipFillRegion(pGraphics, pSolidBrush, pPathRegion)

   ' // Cleanup
   IF pRectRegion THEN GdipDeleteRegion(pRectRegion)
   IF pPathRegion THEN GdipDeleteRegion(pPathRegion)
   IF pSolidBrush THEN GdipDeleteBrush(pSolidBrush)
   IF pPath THEN GdipDeletePath(pPath)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

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


The following illustration shows the output of the preceding code.


José Roca

#1
June 25, 2008, 03:20:37 PM Last Edit: August 07, 2011, 09:54:56 PM by José Roca
 
The following example creates two regions, one from a path and the other from a rectangle. The code then uses the rectangular region to update the path region.

C++

Code Select

VOID Example_XorReg(HDC hdc)
{
   Graphics graphics(hdc);

   Point points[] = {
      Point(110, 20),
      Point(120, 30),
      Point(100, 60),
      Point(120, 70),
      Point(150, 60),
      Point(140, 10)};

   Rect rect(65, 15, 70, 45);
   GraphicsPath path;
   SolidBrush solidBrush(Color(255, 255, 0, 0));

   path.AddClosedCurve(points, 6);

   // Create a region from a path.
   Region pathRegion(&path);

   // Create a region from a rectangle.
   Region rectRegion(rect);

   // Perform an exclusive OR operation on the two regions.
   pathRegion.Xor(&rectRegion);

   graphics.FillRegion(&solidBrush, &pathRegion);
}


PowerBASIC

Code Select

SUB GDIP_CombineRegionRegion (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pPath AS DWORD
   LOCAL pSolidBrush AS DWORD
   LOCAL pPathRegion AS DWORD
   LOCAL pRectRegion AS DWORD
   LOCAL rc AS RECTL
   DIM   pts(5) AS POINTL

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 255, 0, 0), pSolidBrush)

   pts(0).x = 110 : pts(0).y = 20
   pts(1).x = 120 : pts(1).y = 30
   pts(2).x = 100 : pts(2).y = 60
   pts(3).x = 120 : pts(3).y = 70
   pts(4).x = 150 : pts(4).y = 60
   pts(5).x = 140 : pts(5).y = 10

   SetRect rc, 65, 15, 70, 45
   hStatus = GdipCreatePath(%FillModeAlternate, pPath)

   hStatus = GdipAddPathClosedCurveI(pPath, pts(0), 6)

   ' // Create a region from a path.
   hStatus = GdipCreateRegionPath(pPath, pPathRegion)

   ' // Create a region from a rectangle.
   hStatus = GdipCreateRegionRectI(rc, pRectRegion)

   ' // Perform an exclusive OR operation on the two regions.
   hStatus = GdipCombineRegionRegion(pPathRegion, pRectRegion, %CombineModeXor)

   ' // Fill the union of the two regions with a semitransparent blue brush.
   hStatus = GdipFillRegion(pGraphics, pSolidBrush, pPathRegion)

   ' // Cleanup
   IF pRectRegion THEN GdipDeleteRegion(pRectRegion)
   IF pPathRegion THEN GdipDeleteRegion(pPathRegion)
   IF pSolidBrush THEN GdipDeleteBrush(pSolidBrush)
   IF pPath THEN GdipDeletePath(pPath)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB


The following illustration shows the output of the preceding code.


José Roca

#2
June 25, 2008, 03:57:32 PM Last Edit: August 07, 2011, 09:55:21 PM by José Roca
 
The following example creates a region from a rectangle and a region from a path. Then the code uses the path region to update the rectangular region.

C++

Code Select

VOID Example_XorReg(HDC hdc)
{
   Graphics graphics(hdc);

   Point points[] = {
      Point(110, 20),
      Point(120, 30),
      Point(100, 60),
      Point(120, 70),
      Point(150, 60),
      Point(140, 10)};

   Rect rect(65, 15, 70, 45);
   GraphicsPath path;
   SolidBrush solidBrush(Color(255, 255, 0, 0));

   path.AddClosedCurve(points, 6);

   // Create a region from a path.
   Region pathRegion(&path);

   // Create a region from a rectangle.
   Region rectRegion(rect);

   // Update the rectangular region so that it consists of all points inside
   // the path region but outside the rectangular region.
   rectRegion.Complement(&pathRegion);

   graphics.FillRegion(&solidBrush, &pathRegion);
}


PowerBASIC

Code Select

SUB GDIP_CombineRegionRegion (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pPath AS DWORD
   LOCAL pSolidBrush AS DWORD
   LOCAL pPathRegion AS DWORD
   LOCAL pRectRegion AS DWORD
   LOCAL rc AS RECTL
   DIM   pts(5) AS POINTL

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 255, 0, 0), pSolidBrush)

   pts(0).x = 110 : pts(0).y = 20
   pts(1).x = 120 : pts(1).y = 30
   pts(2).x = 100 : pts(2).y = 60
   pts(3).x = 120 : pts(3).y = 70
   pts(4).x = 150 : pts(4).y = 60
   pts(5).x = 140 : pts(5).y = 10

   SetRect rc, 65, 15, 70, 45
   hStatus = GdipCreatePath(%FillModeAlternate, pPath)

   hStatus = GdipAddPathClosedCurveI(pPath, pts(0), 6)

   ' // Create a region from a path.
   hStatus = GdipCreateRegionPath(pPath, pPathRegion)

   ' // Create a region from a rectangle.
   hStatus = GdipCreateRegionRectI(rc, pRectRegion)

   ' // Update the rectangular region so that it consists of all points inside
   ' // the path region but outside the rectangular region.
   hStatus = GdipCombineRegionRegion(pPathRegion, pRectRegion, %CombineModeComplement)

   ' // Fill the union of the two regions with a semitransparent blue brush.
   hStatus = GdipFillRegion(pGraphics, pSolidBrush, pPathRegion)

   ' // Cleanup
   IF pRectRegion THEN GdipDeleteRegion(pRectRegion)
   IF pPathRegion THEN GdipDeleteRegion(pPathRegion)
   IF pSolidBrush THEN GdipDeleteBrush(pSolidBrush)
   IF pPath THEN GdipDeletePath(pPath)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB


The following illustration shows the output of the preceding code.


José Roca

#3
June 26, 2008, 02:17:52 PM Last Edit: August 07, 2011, 09:55:53 PM by José Roca
 
The following example creates two regions, one from a rectangle and the other from a path. Then the code uses the rectangular region to update the path region.

C++

Code Select

VOID Example_ExcludeReg(HDC hdc)
{
   Graphics graphics(hdc);

   Point points[] = {
      Point(110, 20),
      Point(120, 30),
      Point(100, 60),
      Point(120, 70),
      Point(150, 60),
      Point(140, 10)};

   Rect rect(65, 15, 70, 45);
   GraphicsPath path;
   SolidBrush solidBrush(Color(255, 255, 0, 0));

   path.AddClosedCurve(points, 6);

   // Create a region from a rectangle.
   Region rectRegion(rect);

   // Create a region from a path.
   Region pathRegion(&path);

   // Exclude a rectangle region from the path region.
   pathRegion.Exclude(&rectRegion);

   graphics.FillRegion(&solidBrush, &pathRegion);
}


PowerBASIC

Code Select

SUB GDIP_CombineRegionRegion (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pPath AS DWORD
   LOCAL pSolidBrush AS DWORD
   LOCAL pPathRegion AS DWORD
   LOCAL pRectRegion AS DWORD
   LOCAL rc AS RECTL
   DIM   pts(5) AS POINTL

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 255, 0, 0), pSolidBrush)

   pts(0).x = 110 : pts(0).y = 20
   pts(1).x = 120 : pts(1).y = 30
   pts(2).x = 100 : pts(2).y = 60
   pts(3).x = 120 : pts(3).y = 70
   pts(4).x = 150 : pts(4).y = 60
   pts(5).x = 140 : pts(5).y = 10

   SetRect rc, 65, 15, 70, 45
   hStatus = GdipCreatePath(%FillModeAlternate, pPath)

   hStatus = GdipAddPathClosedCurveI(pPath, pts(0), 6)

   ' // Create a region from a path.
   hStatus = GdipCreateRegionPath(pPath, pPathRegion)

   ' // Create a region from a rectangle.
   hStatus = GdipCreateRegionRectI(rc, pRectRegion)

   ' // Exclude a rectangle region from the path region.
   hStatus = GdipCombineRegionRegion(pPathRegion, pRectRegion, %CombineModeExclude)

   ' // Fill the union of the two regions with a semitransparent blue brush.
   hStatus = GdipFillRegion(pGraphics, pSolidBrush, pPathRegion)

   ' // Cleanup
   IF pRectRegion THEN GdipDeleteRegion(pRectRegion)
   IF pPathRegion THEN GdipDeleteRegion(pPathRegion)
   IF pSolidBrush THEN GdipDeleteBrush(pSolidBrush)
   IF pPath THEN GdipDeletePath(pPath)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB


The following illustration shows the output of the preceding code.


José Roca

#4
June 26, 2008, 07:51:48 PM Last Edit: August 07, 2011, 09:56:27 PM by José Roca
 
The following example creates a region from a path and then uses a rectangle to update the region.

C++

Code Select

VOID Example_IntersectReg(HDC hdc)
{
   Graphics graphics(hdc);

   Point points[] = {
      Point(110, 20),
      Point(120, 30),
      Point(100, 60),
      Point(120, 70),
      Point(150, 60),
      Point(140, 10)};

   Rect rect(65, 15, 70, 45);
   GraphicsPath path;
   SolidBrush solidBrush(Color(255, 255, 0, 0));

   path.AddClosedCurve(points, 6);

   // Create a region from a path.
   Region pathRegion(&path);   

   // Create a region from a rectangle.
   Region rectRegion(rect);

   // Update the region to the portion that intersects with another region.
   pathRegion.Intersect(&rectRegion);

   graphics.FillRegion(&solidBrush, &pathRegion);
}


PowerBASIC

Code Select

SUB GDIP_CombineRegionRegion (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pPath AS DWORD
   LOCAL pSolidBrush AS DWORD
   LOCAL pPathRegion AS DWORD
   LOCAL pRectRegion AS DWORD
   LOCAL rc AS RECTL
   DIM   pts(5) AS POINTL

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 255, 0, 0), pSolidBrush)

   pts(0).x = 110 : pts(0).y = 20
   pts(1).x = 120 : pts(1).y = 30
   pts(2).x = 100 : pts(2).y = 60
   pts(3).x = 120 : pts(3).y = 70
   pts(4).x = 150 : pts(4).y = 60
   pts(5).x = 140 : pts(5).y = 10

   SetRect rc, 65, 15, 70, 45
   hStatus = GdipCreatePath(%FillModeAlternate, pPath)

   hStatus = GdipAddPathClosedCurveI(pPath, pts(0), 6)

   ' // Create a region from a path.
   hStatus = GdipCreateRegionPath(pPath, pPathRegion)

   ' // Create a region from a rectangle.
   hStatus = GdipCreateRegionRectI(rc, pRectRegion)

   ' // Exclude a rectangle region from the path region.
   hStatus = GdipCombineRegionRegion(pPathRegion, pRectRegion, %CombineModeIntersect)

   ' // Fill the union of the two regions with a semitransparent blue brush.
   hStatus = GdipFillRegion(pGraphics, pSolidBrush, pPathRegion)

   ' // Cleanup
   IF pRectRegion THEN GdipDeleteRegion(pRectRegion)
   IF pPathRegion THEN GdipDeleteRegion(pPathRegion)
   IF pSolidBrush THEN GdipDeleteBrush(pSolidBrush)
   IF pPath THEN GdipDeletePath(pPath)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB


The following illustration shows the output of the preceding code.


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