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空间解析几何坐标变换公式 (如果单是frz的话, 平面解析几何就足够了)
其中, x, y为原pos, theta为旋转角度
下面这个是相关的VSFilter的源代码片段- void CWord::Transform(CPoint org)
- {
- double scalex = m_style.fontScaleX/100;
- double scaley = m_style.fontScaleY/100;
- double caz = cos((3.1415/180)*m_style.fontAngleZ);
- double saz = sin((3.1415/180)*m_style.fontAngleZ);
- double cax = cos((3.1415/180)*m_style.fontAngleX);
- double sax = sin((3.1415/180)*m_style.fontAngleX);
- double cay = cos((3.1415/180)*m_style.fontAngleY);
- double say = sin((3.1415/180)*m_style.fontAngleY);
- for(int i = 0; i < mPathPoints; i++)
- {
- double x, y, z, xx, yy, zz;
- x = scalex * (mpPathPoints[i].x + m_style.fontShiftX * mpPathPoints[i].y) - org.x;
- y = scaley * (mpPathPoints[i].y + m_style.fontShiftY * mpPathPoints[i].x) - org.y;
- z = 0;
- xx = x*caz + y*saz;
- yy = -(x*saz - y*caz);
- zz = z;
- x = xx;
- y = yy*cax + zz*sax;
- z = yy*sax - zz*cax;
- xx = x*cay + z*say;
- yy = y;
- zz = x*say - z*cay;
- zz = max(zz, -19000);
- x = (xx * 20000) / (zz + 20000);
- y = (yy * 20000) / (zz + 20000);
- mpPathPoints[i].x = (LONG)(x + org.x + 0.5);
- mpPathPoints[i].y = (LONG)(y + org.y + 0.5);
- }
- }
复制代码 参考链接:
http://zh.wikipedia.org/wiki/%E6%97%8B%E8%BD%AC
http://zhidao.baidu.com/question/31601042
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