描述
画弧.圆弧是椭圆的一部分.
C++ Syntax
Status DrawArc( [in] const Pen *pen, [in] REAL x, [in] REAL y, [in] REAL width, [in] REAL height, [in] REAL startAngle, [in] REAL sweepAngle ); |
Status DrawArc( [in] const Pen *pen, [in] INT x, [in] INT y, [in] INT width, [in] INT height, [in] REAL startAngle, [in] REAL sweepAngle ); |
Status DrawArc( [in] const Pen *pen, [in, ref] const RectF &rect, [in] REAL startAngle, [in] REAL sweepAngle ); |
Status DrawArc( [in] const Pen *pen, [in, ref] const Rect &rect, [in] REAL startAngle, [in] REAL sweepAngle ); |
FreeBASIC 语法
FUNCTION DrawArc ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL x AS SINGLE, _ BYVAL y AS SINGLE, _ BYVAL nWidth AS SINGLE, _ BYVAL nHeight AS SINGLE, _ BYVAL startAngle AS SINGLE, _ BYVAL sweepAngle AS SINGLE _ ) AS LONG |
FUNCTION DrawArc ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL x AS INT_, _ BYVAL y AS INT_, _ BYVAL nWidth AS INT_, _ BYVAL nHeight AS INT_, _ BYVAL startAngle AS SINGLE, _ BYVAL sweepAngle AS SINGLE _ ) AS LONG |
FUNCTION DrawArc ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL rc AS GpRectF PTR, _ BYVAL startAngle AS SINGLE, _ BYVAL sweepAngle AS SINGLE _ ) AS LONG |
FUNCTION DrawArc ( _ BYVAL pPen AS CGpPen PTR, _ BYVAL rc AS GpRect PTR, _ BYVAL startAngle AS SINGLE, _ BYVAL sweepAngle AS SINGLE _ ) AS LONG |
参数
pPen
[in]指针的那一支钢笔是用来画弧.
x
[in]单精度数,指定包含圆弧椭圆的边框左上角的x坐标.
y
[in]单精度数,指定包含圆弧椭圆的边框左上角的y坐标.
nWidth
[in]简单精度数,指定包含圆弧椭圆的宽度.
nHeight
[in]简单精度数,指定包含圆弧椭圆的高度.
startAngle
[in]简单精度数指定X轴和圆弧的起始点之间的角度.
sweepAngle
[in]简单精度数指定的开始和结束点之间的弧角.
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 90-degree arc.
' ========================================================================================
SUB Example_DrawArc (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 arc
DIM redPen AS CGpPen = CGpPen(GDIP_ARGB(255, 255, 0, 0), 3)
graphics.DrawArc(@redPen, 0, 0, 200, 100, 0.0, 90.0)
END SUB
' ========================================================================================