jsKeyPressed/js/index.js

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JavaScript
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2021-07-21 18:40:19 +03:00
let canvas = null;
let context = null;
let cW = null;
let cH = null;
let pressedKeys = {};
window.onload = function() {
'use strict';
canvas = document.getElementById('app');
context = canvas.getContext('2d');
cW = canvas.width;
cH = canvas.height;
window.requestAnimationFrame(GameLoop);
}
window.onkeyup = function(e) { pressedKeys[e.code] = false; }
window.onkeydown = function(e) { pressedKeys[e.code] = true; }
function GameLoop(timeStamp) {
'use strict';
Update();
Draw();
window.requestAnimationFrame(GameLoop);
}
function Draw() {
'use strict';
// clean context
context.fillStyle = '#999999';
context.fillRect(0, 0, cW, cH);
context.fillStyle = '#ffffff';
if(pressedKeys['KeyW']) {
context.fillStyle = '#ff0000';
}
context.fillRect(cW / 2 - 25, 100, 50, 50); // W
context.fillStyle = '#ffffff';
if(pressedKeys['KeyA']) {
context.fillStyle = '#ff0000';
}
context.fillRect(cW / 2 - 75, 150, 50, 50); // A
context.fillStyle = '#ffffff';
if(pressedKeys['KeyS']) {
context.fillStyle = '#ff0000';
}
context.fillRect(cW / 2 - 25, 150, 50, 50); // S
context.fillStyle = '#ffffff';
if(pressedKeys['KeyD']) {
context.fillStyle = '#ff0000';
}
context.fillRect(cW / 2 + 25, 150, 50, 50); // D
}
function Update() {
'use strict';
//
}