//Week2 assignment for ITP ICM Fall2005
//Chris Kairalla, Teresa Porter, and Christian Croft



float colorhue= 0;
float colorbright=100; 
float rsize=50;
float distance;
float throttle = 8; //determines speed of size diff
float slider = 160;
int yline = 25;
int xline = 25;
void setup(){
  size(320, 360);  
  background(0);
  colorMode (HSB, 100);
  ellipseMode(CENTER);
  rectMode(CENTER);
  noStroke();
  ellipse(slider, 340, 10,10);
}

void mouseDragged() 
{ 
  if(mouseY > 320) { 
    slider = mouseX;
    throttle = mouseX/ 20;

  } 
} 
void draw(){
  background(0);
  
  //This draws the grid
  for (yline = 25; yline < 310; yline = yline + 40){
    for (xline = 25; xline < 310; xline = xline + 40){
      checkDistance (xline, yline);
      rcolor(distance);
      fill (colorhue,30,colorbright);
      rect(xline, yline, rsize, rsize);
    }
  }
  
  //this is the slider
  fill(0,100,100);
  rect(5, 340, 630, 2);
  fill (0, 0, 100);
  ellipse(slider, 340, 10,10);
}

void checkDistance(int _xline, int _yline){
  distance = dist(_xline, _yline, mouseX, mouseY)/throttle;
  rsize = 50-distance;
  if (rsize <= 5) {
    rsize = 5;
  }
}
void rcolor(float _distance){
  colorhue = 100-_distance;
  colorbright = 100-_distance;
}