描述
画椭圆.
C++ Syntax
Status DrawEllipse( [in] const Pen *pen, [in] REAL x, [in] REAL y, [in] REAL width, [in] REAL height ); |
Status DrawEllipse( [in] const Pen *pen, [in] INT x, [in] INT y, [in] INT width, [in] INT height ); |
Status DrawEllipse( [in] const Pen *pen, [in, ref] const RectF &rect ); |
Status DrawEllipse( [in] const Pen *pen, [in, ref] const Rect &rect ); |
FreeBASIC 语法
FUNCTION DrawEllipse ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL x AS SINGLE, _ BYVAL y AS SINGLE, _ BYVAL nWidth AS SINGLE, _ BYVAL nHeight AS SINGLE _ ) AS GpStatus |
FUNCTION DrawEllipse ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL x AS INT_, _ BYVAL y AS INT_, _ BYVAL nWidth AS INT_, _ BYVAL nHeight AS INT_ _ ) AS GpStatus |
FUNCTION DrawEllipse ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL rc AS GpRectF _ ) AS GpStatus |
FUNCTION DrawEllipse ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL rc AS GpRect _ ) AS GpStatus |
参数
pPen
[in]指针的那一支钢笔是用来绘制椭圆.
x
[in]单精度数指定矩形左上角的x坐标,椭圆的边界.
y
[in]单精度数,指定矩形左上角的坐标范围的椭圆.
nWidth
[in]单精度数指定矩形的宽度范围的椭圆.
nHeight
[in]简单精度数指定矩形的高度填充的椭圆.
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 an ellipse.
' ========================================================================================
SUB Example_DrawEllipse (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 ellipse
DIM bluePen AS CGpPen = CGpPen(GDIP_ARGB(255, 0, 0, 255), 3)
graphics.DrawEllipse(@bluePen, 100.0, 70.0, 200.0, 100.0)
END SUB
' ========================================================================================