/*
* 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;
}
/**
* 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;
}
/**
* Adds quad of vertices (order: bottom left, bottom right, top right, top left). if q.length%2==0
* the array data treated as 2D XY duplets.
*
* @param vv Array of XY duplets or XYZ triplets.
* @return Returns reference to self
*/
public UVertexList addQuad(float[] q) {
int id = 0;
if (q.length == 8) {
add(q[id++], q[id++]);
add(q[id++], q[id++]);
add(q[id++], q[id++]);
add(q[id++], q[id++]);
add(q[0], q[1]);
} else if (q.length == 12) {
add(q[id++], q[id++], q[id++]);
add(q[id++], q[id++], q[id++]);
add(q[id++], q[id++], q[id++]);
add(q[id++], q[id++], q[id++]);
add(q[0], q[1], q[2]);
}
return this;
}
/**
* Adds array of floats as vertices, treating values as XYZ triplets or XY duplets depending on
* whether vv.length%2==0 or vv.length%3==0.
*
* @param vv Array of XY duplets or XYZ triplets.
* @return Returns reference to self
*/
public UVertexList add(float[] vv) {
int id = 0, vn = vv.length;
if (vn == 2) add(vv[0], vv[1]);
else if (vn == 3) add(vv[0], vv[1], vv[2]);
else {
if (vn % 2 == 0) {
for (int i = 0; i < vn / 2; i++) add(vv[id++], vv[id++]);
} else if (vn % 3 == 0) {
for (int i = 0; i < vn / 1; i++) add(vv[id++], vv[id++], vv[id++]);
} else {
Util.logErr(
"VertexList.add(float[]): Unsure what to do with an array of " + vn + " positions.");
Util.logErr("Expecting an array of length divisible by 2 or 3.");
}
}
return this;
}
/** Parses a VertexList from the string produced by VertexList.toDataString(). */
public UVertexList(String in) {
String[] tok = PApplet.split(in, "\t");
v = new UVec3[tok.length];
for (int i = 0; i < tok.length; i++) add(UVec3.parse(tok[i]));
}
/**
* Create new UVertexList by copying the UVertexList given as parameter, leaving the input
* unchanged.
*
* @param _vl UVertexList to copy.
*/
public UVertexList(UVertexList _vl) {
n = 0;
v = new UVec3[_vl.n];
for (int i = 0; i < _vl.n; i++) add(_vl.v[i]);
}
/**
* Adds all vertices from another vertex list. All vertices are copied as new UVec3 instances, so
* changes in either vertex list will not affect the other
*
* @param _vl Input vertex list
* @return Returns reference to self
*/
public UVertexList add(UVertexList _vl) {
for (int i = 0; i < _vl.n; i++) add(_vl.v[i]);
return this;
}
/**
* Adds x,y,z vertex to list
*
* @param x
* @param y
* @param z
* @return Returns reference to self
*/
public UVertexList add(float x, float y, float z) {
add(new UVec3(x, y, z));
return this;
}
/**
* Convenience method to add X,Y vertices
*
* @param x
* @param y
* @return Returns reference to self
*/
public UVertexList add(float x, float y) {
add(x, y, 0);
return this;
}