static void cubicBez(float x1, float y1, float x2, float y2,
float x3, float y3, float x4, float y4,
float tol, int level)
{
float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234;
float d;
if (level > 12) return;
x12 = (x1+x2)*0.5f;
y12 = (y1+y2)*0.5f;
x23 = (x2+x3)*0.5f;
y23 = (y2+y3)*0.5f;
x34 = (x3+x4)*0.5f;
y34 = (y3+y4)*0.5f;
x123 = (x12+x23)*0.5f;
y123 = (y12+y23)*0.5f;
x234 = (x23+x34)*0.5f;
y234 = (y23+y34)*0.5f;
x1234 = (x123+x234)*0.5f;
y1234 = (y123+y234)*0.5f;
d = distPtSeg(x1234, y1234, x1,y1, x4,y4);
if (d > tol*tol) {
cubicBez(x1,y1, x12,y12, x123,y123, x1234,y1234, tol, level+1);
cubicBez(x1234,y1234, x234,y234, x34,y34, x4,y4, tol, level+1);
} else {
glVertex2f(x4, y4);
}
}
static void pathCubicBezShortTo(struct SVGParser* p, float* cpx, float* cpy,
float* cpx2, float* cpy2, float* args, int rel)
{
float x1, y1, x2, y2, cx1, cy1, cx2, cy2;
x1 = *cpx;
y1 = *cpy;
if (rel)
{
cx2 = *cpx + args[0];
cy2 = *cpy + args[1];
x2 = *cpx + args[2];
y2 = *cpy + args[3];
}
else
{
cx2 = args[0];
cy2 = args[1];
x2 = args[2];
y2 = args[3];
}
cx1 = 2*x1 - *cpx2;
cy1 = 2*y1 - *cpy2;
cubicBez(p, x1,y1, cx1,cy1, cx2,cy2, x2,y2);
*cpx2 = cx2;
*cpy2 = cy2;
*cpx = x2;
*cpy = y2;
}
void ofxSVGPathParser::pathCubicBezShortTo(float* cpx, float* cpy, float* cpx2, float* cpy2, float* args, int rel)
{
float x1, y1, x2, y2, cx1, cy1, cx2, cy2;
x1 = *cpx;
y1 = *cpy;
if (rel)
{
cx2 = *cpx + args[0];
cy2 = *cpy + args[1];
x2 = *cpx + args[2];
y2 = *cpy + args[3];
}
else
{
cx2 = args[0];
cy2 = args[1];
x2 = args[2];
y2 = args[3];
}
cx1 = 2*x1 - *cpx2;
cy1 = 2*y1 - *cpy2;
cubicBez(x1,y1, cx1,cy1, cx2,cy2, x2,y2);
//pathInstance->quadBezierTo(x1, y1, cx1, cy1, cx2, cy2, x2, y2);
*cpx2 = cx2;
*cpy2 = cy2;
*cpx = x2;
*cpy = y2;
}
void ofxSVGPathParser::pathCubicBezTo(float* cpx, float* cpy, float* cpx2, float* cpy2, float* args, int rel)
{
float x1, y1, x2, y2, cx1, cy1, cx2, cy2;
x1 = *cpx;
y1 = *cpy;
if (rel)
{
cx1 = *cpx + args[0];
cy1 = *cpy + args[1];
cx2 = *cpx + args[2];
cy2 = *cpy + args[3];
x2 = *cpx + args[4];
y2 = *cpy + args[5];
}
else
{
cx1 = args[0];
cy1 = args[1];
cx2 = args[2];
cy2 = args[3];
x2 = args[4];
y2 = args[5];
}
cubicBez(x1,y1, cx1,cy1, cx2,cy2, x2,y2);
//pathInstance->bezierTo(*x1, *y1, *cx1, *cy1, *cx2, *cy2, *x2, *y2);
*cpx2 = cx2;
*cpy2 = cy2;
*cpx = x2;
*cpy = y2;
}
void drawPath(float* pts, int npts, char closed, float tol)
{
int i;
glBegin(GL_LINE_STRIP);
glColor4ubv(lineColor);
glVertex2f(pts[0], pts[1]);
for (i = 0; i < npts-1; i += 3) {
float* p = &pts[i*2];
cubicBez(p[0],p[1], p[2],p[3], p[4],p[5], p[6],p[7], tol, 0);
}
if (closed) {
glVertex2f(pts[0], pts[1]);
}
glEnd();
}
