描述
Draws a B閦ier spline.
C++ Syntax
Status DrawBezier( [in] const Pen *pen, [in] REAL x1, [in] REAL y1, [in] REAL x2, [in] REAL y2, [in] REAL x3, [in] REAL y3, [in] REAL x4, [in] REAL y4 ); |
Status DrawBezier( [in] const Pen *pen, [in] INT x1, [in] INT y1, [in] INT x2, [in] INT y2, [in] INT x3, [in] INT y3, [in] INT x4, [in] INT y4 ); |
Status DrawBezier( [in] const Pen *pen, [in, ref] const POINTF &pt1, [in, ref] const POINTF &pt2, [in, ref] const POINTF &pt3, [in, ref] const POINTF &pt4 ); |
Status DrawBezier( [in] const Pen *pen, [in, ref] const POINT &pt1, [in, ref] const POINT &pt2, [in, ref] const POINT &pt3, [in, ref] const POINT &pt4 ); |
FreeBASIC 语法
FUNCTION DrawBezier ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL x1 AS SINGLE, _ BYVAL y1 AS SINGLE, _ BYVAL x2 AS SINGLE, _ BYVAL y2 AS SINGLE, _ BYVAL x3 AS SINGLE, _ BYVAL y3 AS SINGLE, _ BYVAL x4 AS SINGLE, _ BYVAL y4 AS SINGLE _ ) AS GpStatus |
FUNCTION DrawBezier ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL x1 AS INT_, _ BYVAL y1 AS INT_, _ BYVAL x2 AS INT_, _ BYVAL y2 AS INT_, _ BYVAL x3 AS INT_, _ BYVAL y3 AS INT_, _ BYVAL x4 AS INT_, _ BYVAL y4 AS INT_ _ ) AS GpStatus |
FUNCTION DrawBezier ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL pt1 AS GpPointF _ ) AS GpStatus |
FUNCTION DrawBezier ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL pt1 AS GpPoint _ ) AS GpStatus |
参数
pPen
[in] Pointer to a pen that is used to draw the B閦ier spline.
x1
[in] Simple precision number that specifies the x-coordinate of the starting point of the B閦ier spline.
y1
[in] Simple precision number that specifies the y-coordinate of the starting point of the B閦ier spline.
x2
[in] Simple precision number that specifies the x-coordinate of the first control point of the B閦ier spline.
y2
[in] Simple precision number that specifies the y-coordinate of the first control point of the B閦ier spline.
x3
[in] Simple precision number that specifies the x-coordinate of the second control point of the B閦ier spline.
y3
[in] Simple precision number that specifies the y-coordinate of the second control point of the B閦ier spline.
x4
[in] Simple precision number that specifies the x-coordinate of the ending point of the B閦ier spline.
y4
[in] Simple precision number that specifies the y-coordinate of the ending point of the B閦ier spline.
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.
引用文件
CGpBitmap.inc (include CGdiPlus.inc)
示例
' ========================================================================================
' The following example draws a B閦ier curve.
' ========================================================================================
SUB Example_DrawBezier (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)
' // Draw the curve.
DIM greenPen AS CGpPen = GDIP_ARGB(255, 0, 255, 0)
graphics.DrawBezier(@greenPen, 100.0, 100.0, 200.0, 10.0, 350.0, 50.0, 500.0, 100.0)
' // Draw the end points and control points.
DIM redBrush AS CGpSolidBrush = GDIP_ARGB(255, 255, 0, 0)
DIM blueBrush AS CGpSolidBrush = GDIP_ARGB(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)
END SUB
' ========================================================================================