PVector[] rrect(float w, float h, float r, int res) {
  PVector[] ret = new PVector[res*4];
  int[] cor = new int[]{-1, -1, 1, -1, 1, 1, -1, 1};
  float[] ang = new float[]{PI, PI+HALF_PI, 0, HALF_PI};
  float inc = HALF_PI/res;
  
  beginShape();
  for(int a=0; a<4; a++) {
    int crx = cor[a*2];
    int cry = cor[a*2+1];
    for(int b=0; b<res; b++) {
      
              
               float cag = ang[a]+inc*b;
      
               float posx = w*.5*crx + r*crx*-1;
      
               float posy = h*.5*cry + r*cry*-1;
      
               float x = posx + 
               cos(cag)*r;
      
               float y = posy + 
               sin(cag)*r;
      
               vertex(x, y);
      ret[b+res*a] = 
               new 
               PVector(x, y);
    }
  }
  
               endShape(
               CLOSE);
  
               return ret;
}