import java.util.*;
import java.awt.*;

public class RectangleTarget extends BApplet {
  ArrayList drops ;
  Rectangle targetRect;

  void setup() {
    size(200,200);
    targetRect = new Rectangle(50,100,20,20);
    drops = new ArrayList();
  }

  void mousePressed(){
    Drop newDrop = new Drop(mouseX,mouseY);
    drops.add(newDrop);
  }

  void loop() {
    background(127);
    
    fill(50);  //draw the rect regular
    rect(targetRect.x, targetRect.y, 10,10);
    
    for (int i = drops.size()-1; i > -1; i--){  //go backwards through the list in class you have to delete one, 
    //normally you would say for (int i =0; i< drops.size();  i++) to go forward throught an array
      Drop thisDrop = (Drop) drops.get(i);  //it has amnesia when it comes out so you have to cast it as something
      thisDrop.moveIt();
      thisDrop.drawIt();
     
 
      if (thisDrop.isHitting(targetRect)){  //if it intersects the target, draw the target differently
        fill(200);
        rect(targetRect.x, targetRect.y, 10,10);
      }
  

      if (thisDrop.isTooLow(height)){
        drops.remove(i);
        println("remove");
      }

    }
    
  }

  class Drop {
    Point dropPos = new Point();  //will hold both x and y

    Drop(int _x, int _y){
      dropPos.x = _x;
      dropPos.y = _y;
    }

    void moveIt(){
      dropPos.y = dropPos.y + 1;
    }

    boolean isTooLow(int _limit){
      return (dropPos.y > _limit);
    }

    boolean isHitting(Rectangle _targetRect){
      return (_targetRect.contains(dropPos)); //finally we don't have to have that terrible if statement
    }

    void drawIt(){
      fill(20);
      ellipse( dropPos.x, dropPos.y,5,5);
    }

  }

}