NYUSH2020S_9_objects

/* IxLab 2020S -  NYU Shanghai
 *  coded in class 
 *  Ideas to practice: 
 *  
 *  - make it move
 *  - add several other balls
 *  - have different ball colors
 */

class Ball {
  // PROPERTIES = variables
  float x, y; 
  float spdX, spdY;
  int r, g, b;     //color of the ball

  // constructor
  Ball () {
    r = 125;
    g = 125;
    b = 125;

    x = random(width);
    y = random(height);
    spdX = random(-10, 10);
    spdY = random(-10, 10);
  } 

  // METHOD = functions inside of an object
  void display() {
    fill(r, g, b);
    ellipse (x, y, 20, 20);
  }
  void update() {
  }
}

/*
float x, y; 
 float spdX, spdY;
 int r, g, b;     //color of the ball
 
 float x2, y2; 
 float spdX2, spdY2;
 int r2, g2, b2;     //color of the ball  2
 */
Ball ball1; 

void setup() {
  size(400, 400);
  noStroke();
  ball1 = new Ball();
}


void draw() {
  background(0);

  ball1.display(); 
  ball1.update();
  
}


/* this was for ball 1
 void initialize() {
 r = 125;
 g = 125;
 b = 125;
 
 x = random(width);
 y = random(height);
 spdX = random(-10, 10);
 spdY = random(-10, 10);
 }
 
 void update() {
 x = x + spdX;
 y = y + spdY;
 //println(x);    //this might come handy when "debugging"
 if ((x > width) || (x < 0)) {  // x is too big
 spdX *= -1;  // spdX = -spdX;
 }
 if ((y > height) || (y < 0)) {  // x is too big
 spdY *= -1;
 }
 }
 
 void display() {
 fill(r, g, b);
 ellipse (x, y, 20, 20);
 }
 */
/* this was for ball 2
 void initialize2() {
 r2 = 125;
 g2 = 125;
 b2 = 125;
 
 x2 = random(width);
 y2 = random(height);
 spdX2 = random(-10, 10);
 spdY2 = random(-10, 10);
 }
 
 void update2() {
 x2 = x2 + spdX2;
 y2 = y2 + spdY2;
 //println(x);    //this might come handy when "debugging"
 if ((x2 > width) || (x2 < 0)) {  // x is too big
 spdX2 *= -1;  // spdX = -spdX;
 }
 if ((y2 > height) || (y2 < 0)) {  // x is too big
 spdY2 *= -1;
 }
 }
 
 void display2() {
 fill(r2, g2, b2);
 ellipse (x2, y2, 20, 20);
 }
 
 */