//it's my first art piece program I've ever written
//move the mouse around the window to control the colored circles
//click and hold on the mouse to stop the trails fading out
//I don't know why the web applet doesn't look as good as the applications
//it doesn't seem to handle the transparency or the HSB colormode command 
//
//enjoy
//jeff hedberg
//http://www.evilblender.com


float currX;
float currY;
float prevX;
float prevY;
float i = 0;


void setup(){
  size(200,200);
  smooth(); 
colorMode(HSB,100,100,100,100);
 fill (0,0,0,100);
 rect(0,0,width,height);
}

void draw(){
  noStroke();
  
  currX = (mouseX - prevX) / 50;
  currY = (mouseY - prevY) / 50;
  prevX = prevX + currX;
  prevY = prevY + currY;
 
  fill(i,75,80,100);
    
  //the four corners
  ellipse(prevX,prevY,10,10);
  ellipse(width-prevX,prevY,10,10);
  ellipse(prevX,height-prevY,10,10);
  ellipse(width-prevX,height-prevY,10,10);
  //now the reverse y and x
  ellipse(prevY,prevX,10,10);
  ellipse(height-prevY,prevX,10,10);
  ellipse(prevY,width-prevX,10,10);
  ellipse(height-prevY,width-prevX,10,10);
  
  
// cycle the colors
 
 i+=.5;
 if (i==100) i=0;
 
//mouse down = start to erase (slowly) 
if (mousePressed == true) {

}else{
  fill(0,2);
 rect(0,0,width,height); 
}

}