描述
绘制基数样条.
C++ Syntax
Status DrawCurve( [in] const Pen *pen, [in] const PointF *points, [in] INT count ); |
Status DrawCurve( [in] const Pen *pen, [in] const Point *points, [in] INT count ); |
Status DrawCurve( [in] const Pen *pen, [in] const PointF *points, [in] INT count, [in] REAL tension ); |
Status DrawCurve( [in] const Pen *pen, [in] const Point *points, [in] INT count, [in] REAL tension ); |
Status DrawCurve( [in] const Pen *pen, [in] const PointF *points, [in] INT count, [in] INT offset, [in] INT numberOfSegments, [in] REAL tension ); |
Status DrawCurve( [in] const Pen *pen, [in] const Point *points, [in] INT count, [in] INT offset, [in] INT numberOfSegments, [in] REAL tension ); |
FreeBASIC 语法
FUNCTION DrawCurve ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL pts AS GpPointF PTR, _ BYVAL count AS INT_ _ ) AS GpStatus |
FUNCTION DrawCurve ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL pts AS GpPoint PTR, _ BYVAL count AS INT_ _ ) AS GpStatus |
FUNCTION DrawCurve ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL pts AS GpPointF PTR, _ BYVAL count AS INT_, _ BYVAL tension AS SINGLE _ ) AS GpStatus |
FUNCTION DrawCurve ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL pts AS GpPoint PTR, _ BYVAL count AS INT_, _ BYVAL tension AS SINGLE _ ) AS GpStatus |
FUNCTION DrawCurve ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL pts AS GpPointF PTR, _ BYVAL count AS INT_, _ BYVAL tension AS SINGLE _ ) AS GpStatus |
FUNCTION DrawCurve ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL pts AS GpPointF PTR, _ BYVAL count AS INT_, _ BYVAL offset AS INT_, _ BYVAL numberOfSegments AS INT_, BYVAL tension AS SINGLE _ ) AS GpStatus |
FUNCTION DrawCurve ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL pts AS GpPoint PTR, _ BYVAL count AS INT_, _ BYVAL offset AS INT_, _ BYVAL numberOfSegments AS INT_, BYVAL tension AS SINGLE _ ) AS GpStatus |
参数
pPen
[in]指针一笔用于绘制基数样条.
pts
[in]指向PointF对象指定的基数样条曲线通过坐标数组.
count
[in]整数,指定的点的数组元素个数.
offset
[in]整数指定元素的数组,指定点的点的基数样条曲线开始.
numberOfSegments
[in]整数,指定的基数样条段数.
tension
[in]简单精度数,指定如何紧密的曲线弯曲的基数样条曲线的坐标.
返回值
如果该方法成功,则返回Ok,这是对Status枚举元素.
如果这个方法失败,它返回一个枚举的其他元素的Status.
备注
段被定义为在主样条中连接两个连续点的曲线.每个段的结束点是下一个的出发点.
引用文件
CGpBitmap.inc (include CGdiPlus.inc)
示例
' ========================================================================================
' The following example draws a cardinal spline.
' ========================================================================================
SUB Example_DrawCurve (BYVAL hdc AS HDC)
' // Create a graphics object from the window device context
DIM graphics AS CGpGraphics = hdc
' // Get the DPI scaling ratio
DIM rxRatio AS SINGLE = graphics.GetDpiX / 96
DIM ryRatio AS SINGLE = graphics.GetDpiY / 96
' // Set the scale transform
graphics.ScaleTransform(rxRatio, ryRatio)
DIM greenPen AS CGpPen = CGpPen(GDIP_ARGB(255, 0, 255, 0), 3)
DIM point1 AS GpPointF : point1.x = 100.0 : point1.y = 100.0
DIM point2 AS GpPointF : point2.x = 200.0 : point2.y = 50.0
DIM point3 AS GpPointF : point3.x = 400.0 : point3.y = 10.0
DIM point4 AS GpPointF : point4.x = 500.0 : point4.y = 100.0
DIM curvePoints(3) AS GpPointF
curvePoints(0) = point1
curvePoints(1) = point2
curvePoints(2) = point3
curvePoints(3) = point4
' // Draw the curve.
graphics.DrawCurve(@greenPen, @curvePoints(0), 4)
' // Draw the points in the curve.
DIM redBrush AS CGpSolidBrush = GDIP_ARGB(255, 255, 0, 0)
graphics.FillEllipse(@redBrush, 95, 95, 10, 10)
graphics.FillEllipse(@redBrush, 195, 45, 10, 10)
graphics.FillEllipse(@redBrush, 395, 5, 10, 10)
graphics.FillEllipse(@redBrush, 495, 95, 10, 10)
END SUB
' ========================================================================================