import java.awt.*;

public class RectangleExample extends PApplet 
{ 
  Rectangle aRectangle;
  Rectangle bRectangle;
  
  int aXDirection = 1;
  int aYDirection = 1;
  int bXDirection = -1;
  int bYDirection = 1;

  color fillColor;
      
  void setup() 
  {
    size(200,200);
  
    fillColor = color(0,0,0);
    
    //Rectangle(int x, int y, int width, int height) 
    aRectangle = new Rectangle(100,100,75,50);
    bRectangle = new Rectangle(50,50,50,75);
  }

  void draw() 
  {
    background(127);

    // Check the bounds of the rectangles
    if (aRectangle.x < 0 || aRectangle.x + aRectangle.width > width)
    {
      aXDirection = aXDirection * -1;
    }
    
    if (bRectangle.x < 0 || bRectangle.x + bRectangle.width > width)
    {
      bXDirection = bXDirection * -1;
    }
    
    if (aRectangle.y < 0 || aRectangle.y + aRectangle.height > height)
    {
      aYDirection = aYDirection * -1;
    }
    
    if (bRectangle.y < 0 || bRectangle.y + bRectangle.height > height)
    {
      bYDirection = bYDirection * -1;
    }
    
    if (aRectangle.intersects(bRectangle))
    {
      aYDirection *= -1;
      aXDirection *= -1;
      bYDirection *= -1;
      bXDirection *= -1; 
    }

    aRectangle.x += aXDirection;
    aRectangle.y += aYDirection;
    bRectangle.x += bXDirection;
    bRectangle.y += bYDirection;
                                
    fill(fillColor);  //draw the rects using the regular processing drawing routine
    rect(aRectangle.x, aRectangle.y, aRectangle.width, aRectangle.height);
    rect(bRectangle.x, bRectangle.y, bRectangle.width, bRectangle.height);    
  }
  
  void mousePressed()
  {
    // Easier than using the width, height and comparing the mouse position
    if (aRectangle.contains(mouseX,mouseY))
    {
      fillColor = color(255,255,255);    
      aYDirection *= -1;
      aXDirection *= -1;      
    }
    else if (bRectangle.contains(mouseX,mouseY))
    {
      fillColor = color(255,255,255);    
      bYDirection *= -1;
      bXDirection *= -1; 
    }    
  }
  
  void mouseReleased()
  {
    // Easier than using the width, height and comparing the mouse position
    if (aRectangle.contains(mouseX,mouseY))
    {
      fillColor = color(0,0,0);      
    }
    else if (bRectangle.contains(mouseX,mouseY))
    {
      fillColor = color(0,0,0);
    }        
  }
}