| 术语 | arcto |
| 释义 | ArcTo 语法： BOOL ArcTo( __in HDC hdc, __in int nLeftRect, __in int nTopRect, __in int nRightRect, __in int nBottomRect, __in int nXRadial1, __in int nYRadial1, __in int nXRadial2, __in int nYRadial2 ); ArcTo功能 该ArcTo函数绘制一个椭圆弧。 参数 hdc [in] 阿处理设备环境下绘图发生。 nLeftRect [in] 的x坐标，按逻辑单位，对边界矩形的左上角。 nTopRect [in] 该y坐标，按逻辑单位，对边界矩形的左上角。 nRightRect [in] 的x坐标，按逻辑单位，在较低的边界矩形右下角。 nBottomRect [in] 在y坐标，按逻辑单位低，的边界矩形右下角。 nXRadial1 [in] 的x坐标，按逻辑单位，对确定弧的起点径向端点。 nYRadial1 [in] 在y坐标，按逻辑单位，对确定弧的起点径向端点。 nXRadial2 [in] 的x坐标，按逻辑单位，对确定弧终点径向端点。 nYRadial2 [in] 在y坐标，按逻辑单位，对确定弧终点径向端点。 返回值 如果函数成功，返回值为非零。 如果函数失败，返回值是零。 备注 ArcTo类似弧功能，除了目前的位置更新。 点(nLeftRect，nTopRect)和(nRightRect，nBottomRect)指定的边界矩形。由指定的边界矩形组成的一个椭圆定义的弧线。弧范围从逆时针方向点相交的地方，从边界矩形的中心辐射线的(nXRadial1，nYRadial1)点。弧线相交的地方结束了从边界矩形中心辐射线的(nXRadial2，nYRadial2)点。如果起点和终点都是一样的，一个完整的椭圆绘制。 一条线是来自目前的立场，弧的起点。如果没有错误发生，当前位置设置为弧的终点。 绘制弧使用当前的笔，它是没有填写。 要求： 最低支持：client－Windows 2000专业版 最低支持server－Windows 2000服务器 HeaderWingdi.h(头文件：winuser.h) LibraryGdi32.lib DLLGdi32.dll 参见 直线和曲线概述 线和曲线函数 AngleArc 弧 SetArcDirection 如果有任何问题和意见，请发送给微软(wsddocfb@microsoft.com) 生成日期：2009年7月11日 ＝＝英文原文＝＝ArcTo Function The ArcTo function draws an elliptical arc. Syntax BOOL ArcTo( __in HDC hdc, __in int nLeftRect, __in int nTopRect, __in int nRightRect, __in int nBottomRect, __in int nXRadial1, __in int nYRadial1, __in int nXRadial2, __in int nYRadial2 ); Parameters hdc [in] A handle to the device context where drawing takes place. nLeftRect [in] The x-coordinate, in logical units, of the upper-left corner of the bounding rectangle. nTopRect [in] The y-coordinate, in logical units, of the upper-left corner of the bounding rectangle. nRightRect [in] The x-coordinate, in logical units, of the lower-right corner of the bounding rectangle. nBottomRect [in] The y-coordinate, in logical units, of the lower-right corner of the bounding rectangle. nXRadial1 [in] The x-coordinate, in logical units, of the endpoint of the radial defining the starting point of the arc. nYRadial1 [in] The y-coordinate, in logical units, of the endpoint of the radial defining the starting point of the arc. nXRadial2 [in] The x-coordinate, in logical units, of the endpoint of the radial defining the ending point of the arc. nYRadial2 [in] The y-coordinate, in logical units, of the endpoint of the radial defining the ending point of the arc. Return Value If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. Remarks ArcTo is similar to the Arc function, except that the current position is updated. The points (nLeftRect, nTopRect) and (nRightRect, nBottomRect) specify the bounding rectangle. An ellipse formed by the specified bounding rectangle defines the curve of the arc. The arc extends counterclockwise from the point where it intersects the radial line from the center of the bounding rectangle to the (nXRadial1, nYRadial1) point. The arc ends where it intersects the radial line from the center of the bounding rectangle to the (nXRadial2, nYRadial2) point. If the starting point and ending point are the same, a complete ellipse is drawn. A line is drawn from the current position to the starting point of the arc. If no error occurs, the current position is set to the ending point of the arc. The arc is drawn using the current pen; it is not filled. Requirements Minimum supported clientWindows 2000 Professional Minimum supported serverWindows 2000 Server HeaderWingdi.h (include Windows.h) LibraryGdi32.lib DLLGdi32.dll See Also Lines and Curves Overview Line and Curve Functions AngleArc Arc SetArcDirection Send comments about this topic to Microsoft Build date: 7/11/2009 ＝＝原始网址＝＝http://msdn.microsoft.com/en-us/library/dd183358(VS.85).aspx\n |
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