The Interactive Image (Fall 2006)

Code

int numDots = 500;
float t, r, x, y, fraq;

void setup(){
  size(400,400);
  smooth();
}

void draw(){
  fill(#333333,10);
  rect(0,0,width,height);
  translate(width/2,height/2);
  pushMatrix();
  { 

    stroke(255);
    if(mousePressed){
      line(pmouseX-(width/2),pmouseY-(height/2),mouseX-(width/2),mouseY-(height/2));
    }
    noFill();
    beginShape();
    rotate(millis()*0.005);
    for (int i=1; i < numDots; i++) {
    
    fraq = i/(float)numDots;
    r = 50*i/150.0;
    t = fraq*TWO_PI*TWO_PI;
    
    x = r*sin(t); // circular identity
    y = r*cos(t); // circular identity
 
    vertex(x,y);
    }
    endShape();
  }
  popMatrix();
}

void keyPressed(){
  if(key == ' '){
    background(100);
  }
}