JSFiddle - React, Tailwind, and code Playground
HTML
<canvas id="canvas" width="400" height="600"></canvas>
CSS
canvas {
margin: auto;
position: absolute;
left: 0;
top: 0;
right: 0;
bottom: 0;
border: 1px solid black;
}
body{
overflow: none;
}
JavaScript
// Set up requestAnimationFrame and cancelAnimationFrame
(function() {
var lastTime = 0;
var vendors = ['ms', 'moz', 'webkit', 'o'];
for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
window.cancelAnimationFrame =
window[vendors[x] + 'CancelAnimationFrame'] ||
window[vendors[x] + 'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame)
window.requestAnimationFrame = function(callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function() {
callback(currTime + timeToCall);
},
timeToCall);
lastTime = currTime + timeToCall;
return id;
};
if (!window.cancelAnimationFrame)
window.cancelAnimationFrame = function(id) {
clearTimeout(id);
};
}());
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
// ship data
var shipPositionX = canvas.width / 2;
var shipPositionY = canvas.height - 30;
var deltaShipPositionX = 10;
var deltaShipPositionY = 10;
var speed = 2.5;
function draw() {
clear();
createRectangleToCoverCanvas();
createSpaceShip(shipPositionX, shipPositionY, 10);
}
function clear() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
}
function createRectangleToCoverCanvas() {
ctx.fillStyle = 'black';
ctx.strokeStyle = 'black';
ctx.beginPath();
ctx.rect(0, 0, canvas.width, canvas.height);
ctx.fill();
ctx.stroke();
}
function createSpaceShip(x, y, radius) {
ctx.fillStyle = 'white'
ctx.strokeStyle = 'white'
ctx.beginPath();
ctx.rect(x, y, 20, 20);
ctx.fill();
ctx.stroke();
}
var raf, direction = {
x: 0,
y: 0
};
function triggerMoveSpaceShip(event) {
switch (event.keyCode) {
// left
case 37:
direction.x = -speed;
event.preventDefault();
break;
// up
...