如何求B样条曲线上点的坐标

如何求B样条曲线上点的坐标

真实的B样条曲线都是计算机软件控制的好吧，你怎么会有这样的问题

{ // bezier曲线 tpoint p0,p1,p2,p3,p11,p22,pp0,pp1,pp2,pt11,pt22; int i; for(i = 0;i < cpfx-1;i++) { pt11 = ppfx[i]; pt22 = ppfx[i+1] pp0 = pts[ptn-1]; pp1 = pt11; pp2.x = (pt11.x + pt22.x)/2; pp2.y = (pt11.y + pt22.y)/2; p0 = pp0; p1.x = pp0.x/3 + 2 * pp1.x/3; p1.y = pp0.y/3 + 2 * pp1.y/3; p2.x = 2 * pp1.x/3 + pp2.x/3; p2.y = 2 * pp1.y/3 + pp2.y/3; p3 = pp2; //register float t; for(float t = 0.0f;t <= 1.0f;t += 0.5f) { float x = (1-t)*(1-t)*(1-t)*p0.x+ 3*t*(1-t)*(1-t)*p1.x+ 3*t*t *(1-t)*p2.x + t*t*t*p3.x; float y = (1-t)*(1-t)*(1-t)*p0.y + 3*t*(1-t)*(1-t)*p1.y+3 *t*t*(1-t)*p2.y + t*t*t*p3.y; pts[ptn].x = x; pts[ptn].y = y; ptn++; } } 根据具体的使用环境调整，这是ttf字库显示用的。