Flappy Bird - code.org GameLab

flappy-bird.js

var FLYING_SPEED = -3;
var GRAVITATIONAL_ACCELERATION = 0.5;

//
// background
//

var backgrounds = [
  createSprite(World.width*0.5, World.height*0.5-28),
  createSprite(World.width*1.5, World.height*0.5-28)
];
var grounds = [
  createSprite(World.width*0.5, World.height),
  createSprite(World.width*1.5, World.height)
];
for (var i=0; i<=1; i++) {
  backgrounds[i].setAnimation("background");
  backgrounds[i].width = World.width;
  if (backgrounds[i].height < World.height) {
    backgrounds[i].height = World.height;
  }
  backgrounds[i].velocityX = FLYING_SPEED * 0.2;
}
for (var i=0; i<=1; i++) {
  grounds[i].setAnimation("base");
  grounds[i].width = World.width;
  grounds[i].velocityX = FLYING_SPEED;
}

function updateBackground() {
  for (var i=0; i<=1; i++) {
    if (backgrounds[i].x <= -World.width*0.5) {
      backgrounds[i].x += World.width*2;
    }
    if (grounds[i].x <= -World.width*0.5) {
      grounds[i].x += World.width*2;
    }
    bird.collide(grounds[i]);
  }
}

//
// bird
//

var bird = createSprite(World.width*0.25, World.height*0.5);
bird.setAnimation("bird");
bird.play();

//
// pipe
//

var pipes = [];
var pipesToCount = [];

function createPipes() {
  var height = randomNumber(80, 120);
  var postion = randomNumber(height*0.5+56, World.height-height*0.5-112);

  var pipeUp = createSprite(World.width, postion-height*0.5-160);
  pipeUp.setAnimation("pipe");
  pipeUp.width = 26;
  pipeUp.mirrorY(-1);
  pipeUp.velocityX = FLYING_SPEED;

  var pipeDown = createSprite(World.width, postion+height*0.5+160);
  pipeDown.setAnimation("pipe");
  pipeDown.width = 26;
  pipeDown.velocityX = FLYING_SPEED;

  pipes.push([pipeUp, pipeDown]);
  
  pipesToCount.push(pipeUp);
}

var randomPipePos = randomNumber(World.width*0.4, World.width*0.7);
function updatePipes() {
  while (pipes.length > 0 && pipes[0][0].x < -pipes[0][0].width*0.5) {
    var v = pipes.shift();
    v[0].destroy();
    v[1].destroy();
  }
  if (pipes.length <= 0 || pipes[pipes.length-1][0].x < randomPipePos) {
    createPipes();
    randomPipePos = randomNumber(World.width*0.4, World.width*0.7);
  }
  for (var i=0; i<pipes.length; i++) {
    bird.collide(pipes[i][0]);
    bird.collide(pipes[i][1]);
  }
  
  while (pipesToCount.length > 0 && pipesToCount[0].x < bird.x - bird.width) {
    score++;
    // if (score % 10 == 0) {
    //   FLYING_SPEED--;
    //   for (var i=0; i<pipes.length; i++) {
    //     pipes[i][0].velocityX = FLYING_SPEED;
    //     pipes[i][1].velocityX = FLYING_SPEED;
    //   }
    //   grounds[0].velocityX = FLYING_SPEED;
    //   grounds[1].velocityX = FLYING_SPEED;
    // }
    pipesToCount.shift();
  }
}

//
// state
//
var state = 0;
var score = 0;
var maxScore = 0;

function drawScore() {
  if (maxScore < score) {
    maxScore = score;
  }
  fill("white");
  textSize(16);
  textAlign("left", "top");
  text("Score: " + score + "\nMax Score: " + maxScore, 10, 10);
}



//
// draw
//

function draw() {
  updateBackground();
  
  if (state == 0) {
    // ready to play
    bird.x = World.width*0.5;
    bird.y = World.height*0.5;
    bird.play();
    drawSprites();
    fill("white");
    textSize(24);
    textAlign("center", "center");
    text("Press [SPACE] to start", 0, 0, World.width, World.height*0.5);
    if (keyWentDown('space')) {
      state = 1;
      score = 0;
      for (var i=0; i<pipes.length; i++) {
        pipes[i][0].destroy();
        pipes[i][1].destroy();
      }
      pipes=[];
      for (var i=0; i<pipesToCount.length; i++) {
        pipesToCount[i].destroy();
      }
      pipesToCount=[];
    }
    return;
  }

  updatePipes();

  if (state == 2) {
    // game over
    drawSprites();
    drawScore();
    
    fill("White");
    textSize(24);
    textAlign("center", "center");
    text("Game Over\nPress [R] to replay", 0, 0, World.width, World.height*0.5);
    if (keyWentDown('r')) {
      while (pipes.length > 0) {
        var v = pipes.shift();
        v[0].destroy();
        v[1].destroy();
      }
      state = 0;
    }
    return;
  }
  
  var accel = GRAVITATIONAL_ACCELERATION;
  if (keyDown('space')) {
    accel = -GRAVITATIONAL_ACCELERATION * 2;
  }

  if (accel < 0) {
    bird.nextFrame();
  } else {
    bird.play();
  }
  bird.velocityY += accel;
  if (bird.y < 0) {
    bird.y = 0;
    bird.velocityY = 0;
  }
  bird.velocityX=0;
  if (bird.x < 0) {
    bird.x = 0;
    state = 2;
  }
  drawSprites();
  drawScore();
}

https://studio.code.org/projects/gamelab/yeTumzoI6xltLWJGykd5vDV40JABIcfgPmep8lBRNl0