Processing: Creative Coding and Computational Art

default constructor
Ball() {
}
Ball(float x, float y, float r) {
this.x = x;
this.y = y;
this.r = r;
}
}
// Vect2D class:
class Vect2D{
float vx, vy;
// default constructor
Vect2D() {
}
Vect2D(float vx, float vy) {
this.vx = vx;
this.vy = vy;
}
}
// checkBoundaryCollision() function:
void checkBoundaryCollision(Ball ball, Vect2D vel){
if (ball.x > width-ball.r){
ball.x = width-ball.r;
vel.vx *= -1;
}
else if (ball.x < ball.r){
ball.x = ball.r;
vel.vx *= -1;
}
else if (ball.y > height-ball.r){
ball.y = height-ball.r;
vel.vy *= -1;
}
else if (ball.y < ball.r){
ball.y = ball.r;
vel.vy *= -1;
}
}
// checkObjectCollision() function:
void checkObjectCollision(Ball[] b, Vect2D[] v){
float d = dist(b[0].x, b[0].y, b[1].x, b[1].y);
if (d < b[0].r + b[1].r){
MOTION
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