/**
* Convenience method to calculate <code>res</code> vertices along a circle of <code>R</code>
* radius
*
* @param R Radius of circle
* @param res Number of points to calculate
* @return
*/
public static UVertexList getCircle(float R, int res) {
UVertexList vl = new UVertexList();
float D = TWO_PI / (float) (res - 1);
for (int i = 0; i < res; i++)
vl.add(PApplet.cos(D * (float) i) * R, PApplet.sin(D * (float) i) * R, 0);
return vl;
}
/*
* Reorders a vertex list organized as a QUAD_STRIP duplets of vertices, so that it forms an outline path instead. The logic is as follows:
* <pre>
* int u=n/2;
* UVertexList tmp=new UVertexList();
*
* for(int i=u-1; i>-1; i--) tmp.add(v[i*2]);
* for(int i=0; i<u; i++) tmp.add(v[i*2+1]);
* v=tmp.v;
* n=tmp.n;
* </pre>
*/
public UVertexList QStoOutline() {
int u = n / 2;
UVertexList tmp = new UVertexList();
for (int i = u - 1; i > -1; i--) tmp.add(v[i * 2]);
for (int i = 0; i < u; i++) tmp.add(v[i * 2 + 1]);
v = tmp.v;
n = tmp.n;
return this;
}