The following example draws a Bézier curve.
C++
VOID Example_DrawBezier4(HDC hdc)
{
Graphics 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;
//Draw the curve.
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);
}
SUB GDIP_DrawBezier (BYVAL hdc AS DWORD)
LOCAL hStatus AS LONG
LOCAL pGraphics AS DWORD
LOCAL pGreenPen AS DWORD
LOCAL pRedBrush AS DWORD
LOCAL pBlueBrush AS DWORD
LOCAL startPointx AS SINGLE
LOCAL startPointy AS SINGLE
LOCAL ctrlPoint1x AS SINGLE
LOCAL ctrlPoint1y AS SINGLE
LOCAL ctrlPoint2x AS SINGLE
LOCAL ctrlPoint2y AS SINGLE
LOCAL endPointx AS SINGLE
LOCAL endPointy AS SINGLE
hStatus = GdipCreateFromHDC(hdc, pGraphics)
' // Create a green Pen
hStatus = GdipCreatePen1(GDIP_ARGB(255, 0, 255, 0), 1.0!, %UnitWorld, pGreenPen)
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
hStatus = GdipDrawBezier(pGraphics, pGreenPen, startPointx, startPointy, ctrlPoint1x, ctrlPoint1y, ctrlPoint2x, ctrlPoint2y, endPointx, endPointy)
' // Create the brushes
hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 255, 0, 0), pRedBrush)
hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 0, 0, 255), pBlueBrush)
' //Draw the end points and control points.
hStatus = GdipFillEllipse(pGraphics, pRedBrush, 100 - 5, 100 - 5, 10, 10)
hStatus = GdipFillEllipse(pGraphics, pRedBrush, 500 - 5, 100 - 5, 10, 10)
hStatus = GdipFillEllipse(pGraphics, pBlueBrush, 200 - 5, 10 - 5, 10, 10)
hStatus = GdipFillEllipse(pGraphics, pBlueBrush, 350 - 5, 50 - 5, 10, 10)
' // Cleanup
IF pBlueBrush THEN GdipDeleteBrush(pBlueBrush)
IF pRedBrush THEN GdipDeleteBrush(pRedBrush)
IF pGreenPen THEN GdipDeletePen(pGreenPen)
IF pGraphics THEN GdipDeleteGraphics(pGraphics)
END SUB
(http://www.jose.it-berater.org/captures/GdipDrawBezier.png)