/// <summary>
/// 获取轮廓多边形列表
/// </summary>
/// <param name="hdc">场景</param>
/// <param name="uChar">字符</param>
/// <returns></returns>
private static DOutline GetOutline(IntPtr hdc, uint uChar)
{
// 转置矩阵
MAT2 mat2 = new MAT2();
mat2.eM11.value = 1;
mat2.eM22.value = 1;
GLYPHMETRICS lpGlyph = new GLYPHMETRICS();
//获取缓存区大小
int bufferSize = GdiNativeMethods.GetGlyphOutline(hdc, uChar, GGO_NATIVE, out lpGlyph, 0, IntPtr.Zero, ref mat2);
if (bufferSize > 0)
{
//获取成功后，分配托管内存
IntPtr buffer = Marshal.AllocHGlobal(bufferSize);
try
{
int ret = GdiNativeMethods.GetGlyphOutline(hdc, uChar, GGO_NATIVE, out lpGlyph, (uint)bufferSize, buffer, ref mat2);
if (ret > 0)
{
//构建轮廓
DOutline outline = new DOutline(lpGlyph.gmBlackBoxX, lpGlyph.gmBlackBoxY);
//从缓存区构造字型轮廓
FillPolygons(outline, buffer, bufferSize);
return(outline);
}
else
{
throw new Exception("获取字型数据失败！");
}
}
finally
{
//释放托管内存
Marshal.FreeHGlobal(buffer);
}
}
else
{
throw new Exception("未能获取缓存区！");
}
}
/// <summary>
/// 获取指定字符在指定字体下的轮廓
/// </summary>
/// <param name="uChar">字符</param>
/// <param name="font">字体</param>
/// <returns></returns>
public static DOutline GetOutline(uint uChar, Font font)
{
//画板
Graphics g = Graphics.FromHwnd(IntPtr.Zero);
IntPtr hdc = g.GetHdc();
//将字体选入场景
IntPtr fontPtr = font.ToHfont();
GdiNativeMethods.SelectObject(hdc, fontPtr);
try
{
return(GetOutline(hdc, uChar));
}
finally
{
//关闭字体句柄，释放场景
GdiNativeMethods.CloseHandle(fontPtr);
g.ReleaseHdc(hdc);
}
}
