motion balls OOP

/* espiral en movimiento, con retroceso

*/

​

ball bola;

​

void setup() {

  size(500, 500);

  bola = new ball();

}

​

void draw() {

  rectMode(CENTER);

  fill(0,10);

  noStroke();

  rect(width/2,height/2,width,height);

bola.move();

bola.display();

 //ball settings

}

 class ball{

  color a;

 // a polar coordinate

float r; // radius value

float theta;

float speed;

float x1;

float y1;

float xp; 

float yp; 

​

ball() {

  a= color (0,0,250);

  r = 50; // radius value

  theta = 1;

  speed = 2;

  x1 = 100;

  y1 = 100;

  xp = r*cos(theta); //add random values to jitter

  yp = r* sin (theta);

}

​

void display(){

 strokeWeight(20);

stroke(250,0,20,40);

noFill ();

ellipse(width/2 +xp,height/2 + yp, 50+r, 50+r);

​

stroke(a,60);

ellipse(width/2 +xp*-1,height/2 + yp*-1, 50+r, 50+r);

​

}

​

void move(){

theta=theta+.1;

r= r+2;

  xp = r*cos(theta);

  yp= r* sin (theta);

if (xp > 400 ) {

xp = 0;

yp=0;

​

​

​

}

​

while (r == 400) {

theta =theta *-.1;

r = r*-1;

​

}

}

 }

​