//Animate a square moving across the screen
//introduction draw loop and to global variables

//THIS CODE IS INTENTIONALLY BROKEN 
//it shows why we actually need global variable declaration


//Processing Copyright info http://processing.org/copyright.html
//This code copyright BitMonkey Labs under Creative Commons Licence: http://creativecommons.org/licenses/by/2.5/
//10/01/2008

int x, inc_x;
int y, inc_y;      //yes, I was thinking of writing a pong-clone, just got lazy :(

void setup()
{
  size(500, 500);  
  x=0;        //set the initial value of x
  inc_x=10;
  
  y=0;        //set the initial value of x
  inc_y=15;
  
  frameRate(30);      //play with the value here <-- speed in frames per second
}

void draw()
//everything in draw loop with be repeated foreeeeeeeeeeeever.........
{

  background(255, 0, 0);        

  rect(x, y, 50, 50);

  x=x+inc_x;        //each time through the loop increment the value of x

  y=y+inc_y;        //each time through the loop increment the value of x



  if ((x>width)||(x<0))          //make sure the box bounces back :)
    //the two pipes above mean "OR", look up "logical operators" in the reference 
  {
    inc_x=inc_x*-1;
  }
  
  if ((y>height)||(y<0))          //make sure the box bounces back :)
    //the two pipes above mean "OR", look up "logical operators" in the reference 
  {
    inc_y=inc_y*-1;
  }
  
  if((x>mouseX)&&(x<mouseX+150))
  {
     if(y==mouseY-50)
     {
       inc_y=inc_y*-1;
     } 
  }
  
 
 rect(mouseX,mouseY,150,20);
 
  
  
}