Spirograph I

processing code

// A variation of Spirograph  by Ali Khan, licensed under Creative Commons at OpenProcessing.org. 
// http://www.openprocessing.org/visuals/?visualID=17230
// Used to create http://www.redbubble.com/people/rupertrussell/t-shirts/7055494-spirograph-v

SpiroCircle sc;
float r1, incr;
boolean pause;
int count;

float currentMouseX;
float currentMouseY;
 
void setup() {
  size(400,400);
  strokeWeight(25);
  smooth();
 
  sc = new SpiroCircle();
  r1 = 0.0;
  incr = 0.05;
  pause = false;
}
 
void draw() {
 
  r1+=incr;
  if(r1>width/2)
    r1=0.0;
 
  if(keyPressed) {
    if(key>='1' && key<='9')
      incr=((int) key-'1'+1)/20.0;
 
    if(key==' ')
      pause=true;
    else
      pause=false;
  }
 
  if(!pause) {
    background(0);
    
    currentMouseX = mouseX;
    currentMouseY = mouseY;
    
    if(currentMouseX == 0){
     currentMouseX = 300;   
    }
    
    if(currentMouseY == 0){
     currentMouseY = 300;   
    }
    
    println(str(currentMouseX));
    
    sc.init(width/2, height/2, r1, currentMouseX/2, currentMouseY/2); 
    sc.drawIterations(1000, incr);
  }
  
  /* 
  if (mousePressed){
    count ++;
    save("AE_" + str(count));
  }
  */
  
}

class SpiroCircle {
 
  int center_x = 0;
  int center_y = 0;
  float r1 = 0;
  float r2 = 0;
  float h = 0;
  float x, y, prev_x, prev_y;
  int iter;
  boolean first;
 
  // constructor
  public void SpiroCirle() {
  }
 
  public void init(int x, int y, float radius_1, float radius_2, float point_distance) {
    center_x = x;
    center_y = y;
    r1 = radius_1;
    r2 = radius_2;
    h = point_distance;
    first = true;
  }
 
  public void drawIterations(int iter, float incr) {
    float rads = 0.0;
 
    for(int i=0; i < iter * 1; ++i) {
      stroke((sin(PI*i/iter)*255)-5 );
      drawPoint(rads);
      rads+=incr;
    }
  }
 
  private void drawPoint(float rads) {
    float x, y;
 
    x = center_x + (r1-r2)*cos(rads)+h*cos((r1-r2)/r2*rads);
    y = center_y + (r1-r2)*sin(rads)+h*sin((r1-r2)/r2*rads);
 
    if(first) {
      first = false;
    }
    else {
      strokeWeight(6);
      // line(prev_x, prev_y, x,y);
      // strokeWeight(17);
      point(x,y);
    }
 
    prev_x = x;
    prev_y = y;
  }
}