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Create flappybird.html #501

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141 changes: 141 additions & 0 deletions flappybird.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<html lang='en'>

<head>
<meta charset='UTF-8'>
<meta name='viewport' content='width=device-width, initial-scale=1.0'>
<style>
canvas {
border: 1px solid #d3d3d3;
background-color: #f1f1f1;
}
</style>
<title>Flappy Bird</title>
</head>

<body onload='startGame()'>
<script>
let myGamePiece;
let myObstacles = [];
let myScore;

function startGame() {
myGamePiece = new component(30, 30, 'red', 10, 120);
myGamePiece.gravity = 0.05;
myScore = new component('30px', 'Consolas', 'black', 280, 40, 'text');
myGameArea.start();
}

let 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.frameNo = 0;
this.interval = setInterval(updateGameArea, 20);
},
clear: function () {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
}

function component(width, height, color, x, y, type) {
this.type = type;
this.score = 0;
this.width = width;
this.height = height;
this.speedX = 0;
this.speedY = 0;
this.x = x;
this.y = y;
this.gravity = 0;
this.gravitySpeed = 0;
this.update = function () {
ctx = myGameArea.context;
if (this.type == 'text') {
ctx.font = this.width + ' ' + this.height;
ctx.fillStyle = color;
ctx.fillText(this.text, this.x, this.y);
} else {
ctx.fillStyle = color;
ctx.fillRect(this.x, this.y, this.width, this.height);
}
}
this.newPos = function () {
this.gravitySpeed += this.gravity;
this.x += this.speedX;
this.y += this.speedY + this.gravitySpeed;
this.hitBottom();
}
this.hitBottom = function () {
let rockbottom = myGameArea.canvas.height - this.height;
if (this.y > rockbottom) {
this.y = rockbottom;
this.gravitySpeed = 0;
}
}
this.crashWith = function (otherobj) {
let myleft = this.x;
let myright = this.x + (this.width);
let mytop = this.y;
let mybottom = this.y + (this.height);
let otherleft = otherobj.x;
let otherright = otherobj.x + (otherobj.width);
let othertop = otherobj.y;
let otherbottom = otherobj.y + (otherobj.height);
let crash = true;
if ((mybottom < othertop) || (mytop > otherbottom) || (myright < otherleft) || (myleft > otherright)) {
crash = false;
}
return crash;
}
}

function updateGameArea() {
let x, height, gap, minHeight, maxHeight, minGap, maxGap;
for (i = 0; i < myObstacles.length; i += 1) {
if (myGamePiece.crashWith(myObstacles[i])) {
return;
}
}
myGameArea.clear();
myGameArea.frameNo += 1;
if (myGameArea.frameNo == 1 || everyinterval(150)) {
x = myGameArea.canvas.width;
minHeight = 20;
maxHeight = 200;
height = Math.floor(Math.random() * (maxHeight - minHeight + 1) + minHeight);
minGap = 50;
maxGap = 200;
gap = Math.floor(Math.random() * (maxGap - minGap + 1) + minGap);
myObstacles.push(new component(10, height, 'green', x, 0));
myObstacles.push(new component(10, x - height - gap, 'green', x, height + gap));
}
for (i = 0; i < myObstacles.length; i += 1) {
myObstacles[i].x += -1;
myObstacles[i].update();
}
myScore.text = 'SCORE: ' + myGameArea.frameNo;
myScore.update();
myGamePiece.newPos();
myGamePiece.update();
}

function everyinterval(n) {
if ((myGameArea.frameNo / n) % 1 == 0) { return true; }
return false;
}

function accelerate(n) {
myGamePiece.gravity = n;
}
</script>
<br>
<button onmousedown='accelerate(-0.2)' onmouseup='accelerate(0.2)'>UP</button>
<p>Use the UP button to stay in the air</p>
<p>How long can you stay alive?</p>
</body>

</html>