import noc.*;

boolean showVectors = true;
boolean check = false;

Thing T;

void setup()
{
  size(640,480);
  T = new Thing(new Vector3D(1,1),new Vector3D(0,0),new Vector3D(420,100));
  translate(320,0);
  smooth();
  ellipseMode(CENTER);
  noStroke();
  fill(200);
}

void draw()
{
  background(0);
  T.go();  
}

void drawVector(Vector3D v, Vector3D l, float scayl)
{
  pushMatrix();
  translate(l.x,l.y);
  popMatrix();
}

void mousePressed()
{
  T = new Thing(new Vector3D(1,1),new Vector3D(0,0),new Vector3D(mouseX,mouseY));
}

// Simple Vector3D
// Daniel Shiffman <http://www.shiffman.net>
// The Nature of Code, Spring 2006

// Demonstrates simple motion with a Thing class

// Created 2 May 2005

// A class to describe a thing in our world
// Has variables for location, velocity, and acceleration

class Thing {
  Vector3D loc;
  Vector3D vel;
  Vector3D acc;

  int change = 1;
  //The Constructor (called when the object is first created)
  Thing(Vector3D a, Vector3D v, Vector3D l) {
    acc = a.copy();
    vel = v.copy();
    loc = l.copy();
  }

  //main function to operate object)
  void go() {
    update();
    borders();
    render();
  }

  //function to update location
  void update() {
    vel.add(acc);
    loc.add(vel);
  }

  void borders() {
    if (loc.y >= height-8) 
    {      
      vel.y*=-1;
      loc.y = height-8;
    }
    if (loc.x >= width-8) 
    {       
      change=-1;
    }
    if (loc.x <= 0) 
    {      
      change=1;
    }
     acc.x-=0.02; 
     if(acc.x<=0) acc.x=0;     
     vel.x = abs(vel.x)-0.007;
     if(abs(vel.x)<=0) vel.x = 0;
     vel.x*=change;     

  }

  //function to display
  void render() {    
    ellipse(loc.x,loc.y,16,16);
    //drawVector(vel,loc,10);
  }

}