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flickyfly.html
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flickyfly.html
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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
canvas {
border:1px solid #d3d3d3;
background-color: #f1f1f1;
}
</style>
</head>
<body onload="startGame()">
<script>
// TODO: OOP approach
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 : () => {
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 : () => {
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 = () => {
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 = () => {
this.gravitySpeed += this.gravity;
this.x += this.speedX;
this.y += this.speedY + this.gravitySpeed;
this.hitBottom();
}
this.hitBottom = () => {
let rockbottom = myGameArea.canvas.height - this.height;
if (this.y > rockbottom) {
this.y = rockbottom;
this.gravitySpeed = 0;
}
}
this.crashWith = (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);
return (
mybottom < othertop ||
mytop > otherbottom ||
myright < otherlef) ||
myleft > otherright
)
}
}
function updateGameArea () {
let x, height, gap, minHeight, maxHeight, minGap, maxGap;
for (let i = 0; i < myObstacles.length; i++) {
if (myGamePiece.crashWith(myObstacles[i])) return;
}
myGameArea.clear();
myGameArea.frameNo++;
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 (let i = 0; i < myObstacles.length; i++) {
myObstacles[i].x -= 1;
myObstacles[i].update();
}
myScore.text = "SCORE: " + myGameArea.frameNo;
myScore.update();
myGamePiece.newPos();
myGamePiece.update();
}
function everyinterval (n) {
return (myGameArea.frameNo / n) % 1 === 0
}
function accelerate (n) {
myGamePiece.gravity = n;
}
</script>
<br>
<button onmousedown="accelerate(-0.2)" onmouseup="accelerate(0.05)">ACCELERATE</button>
<p>Use the ACCELERATE button to stay in the air</p>
<p>How long can you stay alive?</p>
</body>
</html>