/*
*
*/

color colorA;
color colorB;

void setup() {
  size(600,400,P3D);
 // smooth();
  noStroke();
  colorMode(HSB,100);

}



void draw() 
{
 background(1,0,20);
 lights();

   colorA = color(frameCount%100,90,100);
   colorB = color(100-frameCount%100,90,100);
 
 translate(200,200);
 rotateX(frameCount*0.01);
 rotateY(frameCount*0.02);
 rotateZ(frameCount*0.03);
 cylinder(10,200,20,colorA,colorB);
 translate(30,0);
 cylinder(10,200,20,colorA,colorB);
 translate(30,0);
 cylinder(10,200,20,colorA,colorB);
 translate(30,0);
 cylinder(10,200,20,colorA,colorB);
 translate(-90,0);
}

void cylinder(float w, float h, int sides, color colorTop, color colorBottom)
{
  float angle;
  float[] x = new float[sides+1];
  float[] z = new float[sides+1];
 
  //get the x and z position on a circle for all the sides
  for(int i=0; i < x.length; i++){
    angle = TWO_PI / (sides) * i;
    x[i] = sin(angle) * w;
    z[i] = cos(angle) * w;
  }
 
  //draw the top of the cylinder
  beginShape(TRIANGLE_FAN);
  fill(colorTop);
  vertex(0,   -h/2,    0);
  for(int i=0; i < x.length; i++){
    vertex(x[i], -h/2, z[i]);
  }
 
  endShape();
 
  //draw the center of the cylinder
  beginShape(QUAD_STRIP); 
 
  for(int i=0; i < x.length; i++){
    fill(colorTop);
    vertex(x[i], -h/2, z[i]);
    fill(colorBottom);
    vertex(x[i], h/2, z[i]);
    
  }
 
  endShape();
 
  //draw the bottom of the cylinder
  beginShape(TRIANGLE_FAN); 
  fill(colorBottom);
  vertex(0,   h/2,    0);
  
  for(int i=0; i < x.length; i++){
    vertex(x[i], h/2, z[i]);
  }
 
  endShape();
  
}