let charDiam = 50;

let moveDist = 2;

​

let obstacles = [];

let maxObstacleDiam = 50;

​

let rewards = [];

let rewardDiam = 10;

let maxRewardCount = 12;

​

function overlap(o0, o1) {

  let d = sqrt((o1.x - o0.x) ** 2 + (o1.y - o0.y) ** 2);

  return d < o0.d / 2 + o1.d / 2;

}

​

function getObstacleDiam() {

  return random(maxObstacleDiam / 2, maxObstacleDiam);

}

​

function addObject(objArray, objDiam) {

  let rX = random(mChar.x + mChar.d, mChar.x + width);

  let rY = random(mChar.y + mChar.d, mChar.y + height);

​

  objArray.push({

    x: rX % width,

    y: rY % height,

    d: objDiam,

  });

}

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  mChar = {

    x: width / 2,

    y: height / 2,

    d: charDiam,

  };

​

  addObject(rewards, rewardDiam);

​

  addObject(obstacles, getObstacleDiam());

}

​

function draw() {

  background(220, 20, 120);

​

  if (keyIsPressed) {

    keyPressed();

  }

​

  fill(255, 0, 0);

  for (let i = 0; i < obstacles.length; i++) {

    // overlap with obstacle

    if (overlap(mChar, obstacles[i])) {

      obstacles.splice(i, 1);

​

      mChar.d = max(mChar.d - 10, 0);

​

      addObject(obstacles, getObstacleDiam());

      addObject(obstacles, getObstacleDiam());

    } else {

      ellipse(obstacles[i].x, obstacles[i].y, obstacles[i].d);

    }

  }

​

  fill(20, 220, 250);

  for (let i = 0; i < rewards.length; i++) {

    // overlap with reward

    if (overlap(mChar, rewards[i])) {

      rewards.splice(i, 1);

​

      mChar.d += 5;

​

      addObject(obstacles, getObstacleDiam());

​

      addObject(rewards, rewardDiam);

​

      if (rewards.length < maxRewardCount) {

        if (random() < 0.3333) {

          addObject(rewards, rewardDiam);

        }

        if (random() < 0.12) {

          addObject(rewards, rewardDiam);

        }

      }

    } else {

      ellipse(rewards[i].x, rewards[i].y, rewards[i].d);

    }

  }

​

  fill(255, 190, 90);

  ellipse(mChar.x, mChar.y, mChar.d);

}

​

function keyPressed() {

  if (keyCode == UP_ARROW) {

    mChar.y -= moveDist;

  } else if (keyCode == DOWN_ARROW) {

    mChar.y += moveDist;

  } else if (keyCode == LEFT_ARROW) {

    mChar.x -= moveDist;

  } else if (keyCode == RIGHT_ARROW) {

    mChar.x += moveDist;

  } else if (key == "r") {

    mChar.x = width / 2;

    mChar.y = height / 2;

  }

}

​