agar.io game - OpenProcessing

mySketch
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//possible values for movement
let movement = [10, -10]
​
class Food {
  constructor() {
    this.x = random(width)
    this.y = random(height)
  }
  
  // draws food
  render() {
    ellipse(this.x, this.y, 20, 20) 
  }
}
​
class Enemy {
  constructor() {
    this.x = random(width)
    this.y = random(height)
​
    this.size = 20
  }
  render() {
    ellipse(this.x, this.y, this.size, this.size)
  }
  
  eatFood(fx, fy) {
    if (abs(fx - this.x) < this.size && abs(fy - this.y) < this.size) {
      this.size += 5
      return true
    }
    return false
  }
 
  // move enemy in any direction randomly
  
  
  randomStep(){
    let xstep = random(movement)
    let ystep = random(movement)
    this.x += xstep
    
    // if enemy leaves the screen then reset on other side
    if (this.x > width-10) {
      this.x = 10
    }
    else if (this.x < 10) {
      this.x = width - 10
    }
    
    this.y += ystep
    
    if (this.y > height- 10) {
      this.y = 10
    }
    else if (this.y < 10) {
      this.y = height - 10
    }
    
  }
}
​
class Player {
  constructor() {
    this.x = width / 2
    this.y = height / 2
    this.size = 30
  }
  
  // draws player
  render() {
    ellipse(this.x, this.y, this.size, this.size)    
  }
  
  // takes an absolute position
  updatePos(x, y) {
    this.x = x
    this.y = y
  }
  
  // returns true if colliding and increases size
  eatFood(fx, fy) {
    if (abs(fx - this.x) < this.size/2 && abs(fy - this.y) < this.size/2) {
      this.size += 5
      return true
    }
    return false
  }
  
  //eats enemy if larger than it, else enemy eats it.
  //if equal nothing happens
  eatEnemy(enemy) {
    if (abs(enemy.x - this.x) < this.size/2 && abs(enemy.y - this.y) < this.size/2) {
      if (this.size > enemy.size) {
        this.size += enemy.size/3
        return 1
      }
      else if (this.size < enemy.size) {
        enemy.size += this.size/3
        return 2
      }
      else {
        return 3
      }
    }
  }
}
​
let food = []
let enemy = []
let player
​
function setup() { 
  createCanvas(windowWidth, windowHeight);
  background(255, 150, 255)
​
  
  // populate food array
  for (let i = 0; i < 100; i++) {
    food.push(new Food())
  }
  
  // populate enemy array
    for (let i = 0; i < 15; i++) {
    enemy.push(new Enemy())
  }
  // create player
  player = new Player()
  
} 
​
function draw() {
  // clear background
  background(255, 255, 255)
  
  // render food
  fill(255, 255, 255)
  stroke(0, 0, 255)
  
  
  // render food for loop way
  for (let i = 0; i < food.length; i++) {
    food[i].render()
  }
  
  // render player
  fill(0, 0, 255)
  noStroke()
  player.render()
  // render enemy for loop way
  for (let i = 0; i < enemy.length; i++) {
    noStroke()
    fill(255,0,0)
    enemy[i].render()
  }
  
  
  
  // move player
  player.updatePos(mouseX, mouseY)
  
  //move enemies
  for (let i = 0; i < enemy.length; i++) {
    enemy[i].randomStep()
    enemy[i].render()
  }
  
​
  
  // collisions for loop way
  for (let i = 0; i < food.length; i++) {
    if (player.eatFood(food[i].x, food[i].y)) {
      food.splice(i, 1)
      i-- // account for size decrease
      continue
    }
    for (let j = 0; j < enemy.length; j++){
      if (enemy[j].eatFood(food[i].x, food[i].y)){
        food.splice(i, 1)
        i-- 
        break
      }
    }
  }
  
​
  
  for (let i = 0; i < enemy.length; i++) {
    if (player.eatEnemy(enemy[i]) == 1) {
      enemy.splice(i, 1)
      i-- // account for size decrease
    }
    else if (player.eatEnemy(enemy[i]) == 2){
      player.size = 0
      noLoop()
      background(0)
      fill(255)
      textSize(30)
      text("You lose!!!",width/2, height/2)
      //fix this formatting
    }
  }
  
  if (food.length < 3){
    for (i = 0; i < random(0,3); i++) {
      food.push(new Food())
    }
  }
  
  if (enemy.length == 0) {
    noLoop()
      background(0)
      fill(255)
      textSize(30)
      text("You win!!!",width/2, height/2)
  }
    
​
}