Graphics::DrawClosedCurve(constPen*,constPointF*,INT,REAL) method (gdiplusgraphics.h)
The Graphics::DrawClosedCurve method draws a closed cardinal spline.
Syntax
Status DrawClosedCurve(
[in] const Pen *pen,
[in] const PointF *points,
[in] INT count,
[in] REAL tension
);
Parameters
[in] pen
Type: const Pen*
Pointer to a pen that is used to draw the closed cardinal spline.
[in] points
Type: const PointF*
Pointer to an array of PointF objects that specify the coordinates of the closed cardinal spline. The array of PointF objects must contain a minimum of three elements.
[in] count
Type: INT
Integer that specifies the number of elements in the points array.
[in] tension
Type: REAL
Real number that specifies how tightly the curve bends through the coordinates of the closed cardinal spline.
Return value
Type: Status
If the method succeeds, it returns Ok, which is an element of the Status enumeration.
If the method fails, it returns one of the other elements of the Status enumeration.
Remarks
Each ending point is the starting point for the next cardinal spline. In a closed cardinal spline, the curve continues through the last point in the points array and connects with the first point in the array.
Examples
The following example draws a closed cardinal spline.
VOID Example_DrawClosedCurve4(HDC hdc)
{
Graphics graphics(hdc);
// Define a Pen object and an array of PointF objects.
Pen greenPen(Color(255, 0, 0, 255), 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);
PointF curvePoints[7] = {
point1,
point2,
point3,
point4,
point5,
point6,
point7};
// Draw the closed curve.
graphics.DrawClosedCurve(&greenPen, curvePoints, 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));
}
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP, Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | gdiplusgraphics.h (include Gdiplus.h) |
| Library | Gdiplus.lib |
| DLL | Gdiplus.dll |