// If you "mouse click" within ball, score goes up

// If you miss a "mouse click", score goes down

//

// Versions:

// - Version 1: https://editor.p5js.org/jonfroehlich/sketches/04sI6mCwQ

// - Version 2 (changes dir/speed after scoring): https://editor.p5js.org/jonfroehlich/sketches/TPN7xA0WD

// - This version (has stages, gets faster):  https://editor.p5js.org/jonfroehlich/sketches/Cs1lWc1-_ 

// - Version 4 (has timing): https://editor.p5js.org/jonfroehlich/sketches/ZtbrCLdhw

//

// By Jon Froehlich

// https://makeabilitylab.cs.washington.edu/

// 

let x;

let y;

let xSpeed;

let ySpeed;

let diameter = 40;

let score = 0;

let stage = 1;

​

function setup() {

  createCanvas(400, 400);

  x = width / 2;

  y = height / 2;

  xSpeed = random(1, 3); // random x speed 

  ySpeed = random(1, 2); // random y speed

}

​

function draw() {

  background(220);

  x += xSpeed;

  y += ySpeed;

  fill(200, 0, 0);

  noStroke();

  ellipse(x, y, diameter);

  // check to make sure it doesn't go offscreen

  let radius = diameter / 2;

  if(x - radius < 0 || x + radius > width){

    xSpeed = xSpeed * -1; // reverse x direction

  }

  if(y - radius < 0 || y + radius > height){

    ySpeed = ySpeed * -1; // reverse y direction

  }

  textSize(20);

  fill("black");

  text("Score: " + score + "  Stage: " + stage, 10, 25);

}

​

function mousePressed(event){

  let distMouseAndCircleCenter = dist(mouseX, mouseY, x, y);

  if(distMouseAndCircleCenter <= diameter / 2){

    score++;

    if(score > 0 && score % 5 == 0){ // if score is divisible by 5

      stage++;

    }

    xSpeed = random(1, 2 * stage); // random x speed 

    ySpeed = random(1, 2 * stage); // random y speed

    if(random() < 0.5){

      xSpeed = xSpeed * -1;

    }

    if(random() < 0.5){

      ySpeed = ySpeed * -1;

    }

  }else{

    score--;

    if(score % 5 == 0 && stage > 1){ // if score is divisible by 5

      stage--;

    }

  }

}

​

function keyPressed() {

  if(key == ' '){

    print("Reseting the game!")

    score = 0;

  }

}