E9

int d = 10;

​

int xPos = 100;

int yPos = 100;

int directionX = 2;

int directionY = 2;

​

void setup() {

  size(300, 300);

​

  smooth();

}

​

void draw() {

  background(255);

​

​

​

noStroke();

fill(0);

ellipse(xPos, yPos, 20, 20);

fill(255);

text("+", xPos, yPos);

​

  xPos = xPos + directionX;

  yPos = yPos + directionY;

   if (xPos > mouseX || xPos <d/2) {

    directionX = -directionX;

   }

    if(yPos < d/2 || yPos > mouseY){

    directionY = -directionY;

  }

​

​

​

​

if(mousePressed){

  fill(0);

ellipse(mouseX, mouseY, 20, 20);

fill(255);

text("-", mouseX, mouseY);

​

​

}

}