hi everyone,

i want to write a programm that draws voronoi cells based on a particle system. yet i didn´t come too far. my problem is that i always get arrayIndexOutOfBounds. i want to use the expand function but that seems not to work.
thank you for every answer.
here is the code

import noc.*;


Particle[] p;
int numP = 50;

float xpos,ypos,dia;

void setup(){
 
 size(400,400);
 
 
 
 p = new Particle[numP];
 
 for(int i=0;i<numP;i++){
   
   xpos = random(0,width);
   ypos = random(0,height);
   dia = 10;
   
   p[i] = new Particle(xpos,ypos,dia);
   
 }
 
}

void draw(){
 
 background(0);
 
 Vector3D[] allPts = new Vector3D[numP];
 
 for(int i=0;i<numP;i++){
 
   allPts[i] = new Vector3D(p[i].xpos,p[i].ypos);
 }
 
 for(int i=0;i<numP;i++){
   
   p[i].display();
   
   Vector3D pt = allPts[i];    
   connect(pt,allPts);
   
 }
 
}

void connect(Vector3D pt,Vector3D[] allPts){
 
 float d;
 float maxD = 10.0;
 int numRel,numPts;
 
 int c = 0;
 Vector3D[] vecRel = new Vector3D[c];
   
 numPts = allPts.length;

 for(int i=0;i<numPts;i++){
   
   Vector3D vecA = new Vector3D();
   vecA.sub(pt,allPts[i]);
   d = vecA.magnitude();
   
   /*###############################################
   vecRel does not expand
   */
   
   if(d<maxD){
     
     println("c = " + c);
     vecRel[c] = allPts[i];
                   
     c += 1;
     vecRel = (Vector3D[]) expand(vecRel,c);
     println("test");
   }  
 }
 
 //######################################################
   
}

thank you very much, ArrayList helped.