The following example creates and draws a
path that has a line, a rectangle, an ellipse, and a curve. The code calls the
path's
GdipGetPointCount function to determine the number of data points that are stored in the
path. The code allocates a buffer large enough to receive the array of data points and passes the address of that buffer to the
GdipGetPathPoints function. Finally, the code draws each of the
path's data points.
C++
VOID GetPathPointsExample(HDC hdc)
{
Graphics graphics(hdc);
// Create a path that has a line, a rectangle, an ellipse, and a curve.
GraphicsPath path;
PointF[] = {
PointF(200, 200),
PointF(250, 240),
PointF(200, 300),
PointF(300, 310),
PointF(250, 350)};
path.AddLine(20, 100, 150, 200);
path.AddRectangle(Rect(40, 30, 80, 60));
path.AddEllipse(Rect(200, 30, 200, 100));
path.AddCurve(points, 5);
// Draw the path.
Pen pen(Color(255, 0, 0, 255));
graphics.DrawPath(&pen, &path);
// Get the path points.
INT count = path.GetPointCount();
PointF* dataPoints = new PointF[count];
path.GetPathPoints(dataPoints, count);
// Draw the path's data points.
SolidBrush brush(Color(255, 255, 0, 0));
for(INT j = 0; j < count; ++j)
{
graphics.FillEllipse(
&brush,
dataPoints[j].X - 3.0f,
dataPoints[j].Y - 3.0f,
6.0f,
6.0f);
}
delete [] dataPoints;
}
Color(255, 255, 0, 0)
SUB GDIP_GetPathPoints (BYVAL hdc AS DWORD)
LOCAL hStatus AS LONG
LOCAL pGraphics AS DWORD
LOCAL pPath AS DWORD
LOCAL pPen AS DWORD
LOCAL pBrush AS DWORD
LOCAL i AS LONG
LOCAL count AS LONG
DIM pts(4) AS POINTF
DIM DataPoints(0) AS POINTF
hStatus = GdipCreateFromHDC(hdc, pGraphics)
' // Create a path that has a line, a rectangle, an ellipse, and a curve.
hStatus = GdipCreatePath(%FillModeAlternate, pPath)
pts(0).x = 200 : pts(0).y = 200
pts(1).x = 250 : pts(1).y = 240
pts(2).x = 200 : pts(2).y = 300
pts(3).x = 300 : pts(3).y = 310
pts(4).x = 250 : pts(4).y = 350
hStatus = GdipAddPathLine(pPath, 20, 100, 150, 200)
hStatus = GdipAddPathRectangle(pPath, 40, 30, 80, 60)
hStatus = GdipAddPathEllipse(pPath, 200, 30, 200, 100)
hStatus = GdipAddPathCurve(pPath, pts(0), 5)
' // Draw the path
hStatus = GdipCreatePen1(GDIP_ARGB(255, 0, 0, 255), 1, %UnitWorld, pPen)
hStatus = GdipDrawPath(pGraphics, pPen, pPath)
' // Get the path points
hStatus = GdipGetPointCount(pPath, count)
IF count THEN
REDIM DataPoints(count - 1)
hStatus = GdipGetPathPoints(pPath, DataPoints(0), count)
END IF
' // Create a solid brush.
hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 255, 0, 0), pBrush)
' // Draw the path's data points.
FOR i = 0 TO count - 1
hStatus = GdipFillEllipse(pGraphics, pBrush, DataPoints(i).x - 3, DataPoints(i).y - 3, 6, 6)
NEXT
' // Cleanup
IF pBrush THEN GdipDeleteBrush(pBrush)
IF pPen THEN GdipDeletePen(pPen)
IF pPath THEN GdipDeletePath(pPath)
IF pGraphics THEN GdipDeleteGraphics(pGraphics)
END SUB
(http://www.jose.it-berater.org/captures/GdipGetPathPoints.png)