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flappyBird.html
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flappyBird.html
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<!DOCTYPE html>
<html>
<head>
<title> Flappy Bird </title>
<style>
canvas {
border: 1px solid #d3d3d3;
background-color: rgb(200, 250, 255);
}
</style>
</head>
<body onload="startGame()">
<script>
var myGamePiece;
var myObstacles = [];
var score = 0;
function startGame() {
myGameArea.start();
myGamePiece = new component(30, 30, "rgb(230, 230, 65)", 100, 120);
}
var myGameArea = {
canvas : document.createElement("canvas"),
start : function() {
this.canvas.width = 480;
this.canvas.height = 270;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.interval = setInterval(updateGameArea, 20);
window.addEventListener('keydown', function (e) {
myGameArea.key = e.keyCode;
})
window.addEventListener('keyup', function (e) {
myGameArea.key = false;
})
this.frameNo = 0;
},
clear : function() {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
},
stop : function() {
endGameMessage();
clearInterval(this.interval);
}
}
function component(width, height, color, x, y) {
this.width = width;
this.height = height;
this.x = x;
this.y = y;
this.speedY = 2;
this.jumpTimeRemaining = 0;
this.update = function() {
context = myGameArea.context;
context.fillStyle = color;
context.fillRect(this.x, this.y, this.width, this.height);
}
this.newPosition = function() {
myGamePiece.y += myGamePiece.speedY;
}
this.jump = function() {
this.jumpTimeRemaining = 12;
this.speedY = -3;
}
this.crashWith = function(otherObj) {
var myLeft = this.x;
var myRight = this.x + (this.width);
var myTop = this.y;
var myBottom = this.y + (this.height);
var otherLeft = otherObj.x;
var otherRight = otherObj.x + (otherObj.width);
var otherTop = otherObj.y;
var otherBottom = otherObj.y + (otherObj.height);
if((myBottom < otherTop) ||
(myTop > otherBottom) ||
(myRight < otherLeft) ||
(myLeft > otherRight))
return false;
return true;
}
}
function updateGameArea() {
myGameArea.clear();
myGameArea.frameNo += 1;
createWalls();
moveWalls();
// key 32 mean space bar
if(myGameArea.key == 32 && myGamePiece.y > 0)
myGamePiece.jump();
if(myGamePiece.jumpTimeRemaining == 0) {
myGamePiece.speedY = 2;
}
else{
myGamePiece.jumpTimeRemaining -= 1;
}
myGamePiece.newPosition();
myGamePiece.update();
if(crashed())
myGameArea.stop();
if(myGameArea.frameNo > 200 && (myGameArea.frameNo - 50) % 150 == 0)
score++;
displayScore();
}
function displayScore() {
myGameArea.context.font = "20px" + " " + "Consolas";
myGameArea.context.fillStyle = "black";
myGameArea.context.fillText("Score: " + score, 350, 40);
}
function createWalls() {
if(myGameArea.frameNo%150 == 0){
wallColor = "rgb(55, 180, 50)";
x = myGameArea.canvas.width;
minHeight = 20;
maxHeight = 170;
height = Math.floor(Math.random()*(maxHeight - minHeight + 1) + minHeight);
width = 50;
gap = 100;
myObstacles.push(new component(width, height, wallColor, x, 0));
myObstacles.push(new component(width, x-height-gap, wallColor, x, height + gap));
}
}
function moveWalls() {
for(i=0; i<myObstacles.length; i += 1) {
myObstacles[i].x += -2;
myObstacles[i].update();
}
}
function endGameMessage() {
myGameArea.context.font = "40px" + " " + "Consolas";
myGameArea.context.fillStyle = "black";
myGameArea.context.fillText("Game Over", 130, 140);
}
function crashed() {
for(i = 0; i < myObstacles.length; i += 1) {
if(myGamePiece.crashWith(myObstacles[i])) {
return true;
}
}
if(myGamePiece.y + myGamePiece.height > myGameArea.canvas.height)
return true;
return false;
}
function randomColor() {
var r = Math.floor(Math.random()*256);
var g = Math.floor(Math.random()*256);
var b = Math.floor(Math.random()*256);
return "rgb("+r+","+g+","+b+")";
}
</script>
</body>
</html>