GDI+: GdipStartPathFigure

[José Roca]

The following example creates a path and adds two figures to that path. The first figure has three arcs, and the second figure has two arcs. The arcs within a figure are connected by straight lines, but there is no connecting line between the last arc in the first figure and the first arc in the second figure.

C++

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

   Pen pen(Color(255, 0, 0, 255));
   Rect rect(0, 0, 100, 50);
   GraphicsPath path;

   path.AddArc(0, 0, 100, 50, 0.0f, 180.0f);
   path.AddArc(0, 60, 100, 50, 0.0f, 180.0f);
   path.AddArc(0, 120, 100, 50, 0.0f, 180.0f);

   // Start a new figure (subpath).
   // Do not close the current figure.
   path.StartFigure();
   path.AddArc(0, 180, 100, 50, 0.0f, 180.0f);
   path.AddArc(0, 240, 100, 50, 0.0f, 180.0f);

   graphics.DrawPath(&pen, &path);
}


PowerBASIC

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SUB GDIP_StartPathFigure (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pPath AS DWORD
   LOCAL pPen AS DWORD
   DIM   pts(2) AS POINTF

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   hStatus = GdipCreatePath(%FillModeAlternate, pPath)
   hStatus = GdipCreatePen1(GDIP_ARGB(255, 0, 0, 255), 1, %UnitWorld, pPen)
   hStatus = GdipAddPathArc(pPath, 0, 0, 100, 50, 0, 180)
   hStatus = GdipAddPathArc(pPath, 0, 60, 100, 50, 0, 180)
   hStatus = GdipAddPathArc(pPath, 0, 120, 100, 50, 0, 180)

   ' // Start a new figure (subpath).
   ' // Do not close the current figure.
   hStatus = GdipStartPathFigure(pPath)
   hStatus = GdipAddPathArc(pPath, 0, 180, 100, 50, 0, 180)
   hStatus = GdipAddPathArc(pPath, 0, 240, 100, 50, 0, 180)
   hStatus = GdipDrawPath(pGraphics, pPen, pPath)

   ' // Cleanup
   IF pPen THEN GdipDeletePen(pPen)
   IF pPath THEN GdipDeletePath(pPath)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB