/**
* Course Number: 22491 for Eng 
* Assignment Number: 5
* Question Number: 
* Sketch description
* @author Ignas Jauneika, G00247692  
* 08/03/2009
*/


int xpos, ypos;   

int xspeed = 1;  
int yspeed = 2;  

int xdirection = 1;  
int ydirection = 1;  


void setup () {
  size ( 300, 300 );
  smooth ();
  frameRate(30);
  
}

void draw () {
  
  background (255);
  
  rectMode(CENTER);
  fill (distanceFromMouse(0,0));
  rect ( 150, 150, 50, 50);
  
  rectMode(CORNER);
  
  drawRect ( 0, 0, 300, color(mouseX,38,mouseY,140));
  drawRect ( 0,150,300, color(100,mouseX,0,140));
  int tsize = int(dist(xpos,ypos,mouseX,mouseY)/2);
  drawCircle ( xpos, ypos,tsize, color (xpos,ypos));
  move();
  bounce();
  
  
}

void drawRect (int x, int y, int thesize, color c) {
  noStroke ();
  fill (c);
  rect ( x, y, thesize, thesize/2);
}

void drawCircle ( int xpos, int ypos, int circlesize, color c) {
  noStroke();
  fill(c);
  ellipse ( xpos, ypos, circlesize, circlesize);
}

void move () {
   xpos = xpos + ( xspeed * xdirection );
   ypos = ypos + ( yspeed * ydirection );
}

void bounce () {
   if (xpos > width || xpos < 0) {
    xdirection *= -1;
  }
  if (ypos > height || ypos < 0) {
    ydirection *= -1;
  }
}
float distanceFromMouse(int f, int i) {
  float dx = f-mouseX;
  float dy = i-mouseY;
  float d = sqrt(dx*dx + dy*dy);
  return d;
}