Bouncing Balls

/*

Bouncing Balls by Xiaofeng Lin

Multiple balls going back and forth in different speeds

*/

​

​

int xPos;

int yPos;

​

int xPos2;

int yPos2;

​

int xPos3;

int yPos3;

​

//speeds of balls

int velocity;

int velocity2;

int velocity3;

​

void setup(){

   size(400,400);

   xPos = width/2;

   yPos = height/2;

   xPos2 = width/3;

   yPos2 = height/3;

   xPos3 = width/4;

   yPos3 = height*2/3;

   velocity = 3;

   velocity2 = 6;

   velocity3 = 9;

}

​

void draw(){

   background(230);

   fill(0,255,0);

   //middle ball

   xPos += velocity;

   if(xPos >= width-25 || xPos <= 25) {

   velocity = -velocity;

   }

   noStroke();

   fill(255-velocity*10,255-velocity2*10,255-velocity3*10);

   ellipse(xPos,yPos,50,50);

​

​

   //upper ball

   xPos2 += velocity2;

   if(xPos2 >= width-25 || xPos2 <= 25) {

   velocity2 = -velocity2;

   }

   fill(255-velocity*10,255-velocity2*10,255-velocity3*10);

   ellipse(xPos2,yPos2,50,50);

   //vertical ball

   yPos3 += velocity3;

   if(yPos3 >= height-25 || yPos3 <= 25) {

   velocity3 = -velocity3;

   }

   fill(255-velocity*10,255-velocity2*10,255-velocity3*10);

   ellipse(xPos3,yPos3,50,50);

​

​

}