在路径上添加一个圆角矩形

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//BOOL pathAddRoundRecangle( GraphicsPath *path , RectF rect , float roundSize )
//功能：在路径上添加一个圆角矩形
//程序员：黄江斌
//时间：8:40 2005-10-1
//最后修改时间：8:41 2005-10-1

BOOL yourClass::pathAddRoundRecangle(
            GraphicsPath *path ,
            RectF rect ,
            float roundSize )
{
float left = rect.X;
float top = rect.Y;
float right = rect.Width + rect.X;
float bottom = rect.Height + rect.Y;

//如果取值不合法，指定roundSize为10或较短边的1/4
if( roundSize <= 0 )
roundSize = 10;
float shortOne = rect.Width < rect.Height ? rect.Width : rect.Height;
if( roundSize > shortOne / 4 )
roundSize = shortOne / 4;

//左上角
path->AddArc( left , top , 2 * roundSize , 2 * roundSize , 180 , 90 );
//上横线
path->AddLine( left + roundSize , top , right - roundSize , top );
//右上角
path->AddArc( right - 2 * roundSize , top , 2 * roundSize , 2 * roundSize , 270 , 90 );
//右竖线
path->AddLine( right , top + roundSize , right , bottom - roundSize );
//右下角
path->AddArc( right - 2 * roundSize , bottom - 2 * roundSize , 2 * roundSize , 2 * roundSize , 0 , 90 );
//下横线
path->AddLine( left + roundSize , bottom , right - roundSize , bottom );
//左下角
path->AddArc( left , bottom - 2 * roundSize , 2 * roundSize , 2 * roundSize , 90 , 90 );
//左竖线
path->AddLine( left , top + roundSize , left , bottom - roundSize );

return TRUE;
}