Created
February 27, 2022 04:23
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Moveable player for Canvas JS Game Tutorial. Timecode is 38:26
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const canvas = document.querySelector('canvas'); | |
const context = canvas.getContext('2d'); | |
const projectiles = []; | |
canvas.width = window.innerWidth; | |
canvas.height = window.innerHeight; | |
const x = canvas.width / 2; | |
const y = canvas.height / 2; | |
class Player { | |
constructor(x, y, radius, color) { | |
this.x = x; | |
this.y = y; | |
this.radius = radius; | |
this.color = color; | |
this.moveUp = false; | |
this.moveDown = false; | |
this.moveRight = false; | |
this.moveLeft = false; | |
} | |
draw() { | |
context.beginPath(); | |
context.arc(this.x, this.y, this.radius, 0, 360, false);//Math.PI * 2 | |
context.fillStyle = this.color; | |
context.fill(); | |
} | |
update() { | |
this.draw(); | |
if(this.moveUp) { | |
this.y = this.y - 1; | |
} | |
if(this.moveDown) { | |
this.y = this.y + 1; | |
} | |
if(this.moveRight) { | |
this.x = this.x + 1; | |
} | |
if(this.moveLeft) { | |
this.x = this.x - 1; | |
} | |
} | |
getX() { | |
return this.x; | |
} | |
getY() { | |
return this.y; | |
} | |
} | |
class Projectile { | |
constructor(x, y, radius, color, velocity) { | |
this.x = x; | |
this.y = y; | |
this.radius = radius; | |
this.color = color; | |
this.velocity = velocity; | |
} | |
draw() { | |
context.beginPath(); | |
context.arc(this.x, this.y, this.radius, 0, 360, false);//Math.PI * 2 | |
context.fillStyle = this.color; | |
context.fill(); | |
} | |
update() { | |
this.draw(); | |
this.x = this.x + this.velocity.x; | |
this.y = this.y + this.velocity.y; | |
} | |
} | |
const player = new Player(x, y, 30, 'green'); | |
// const projectile = new Projectile(player.getX(), player.getY(), 7, 'red', { x: 1, y: 1 }); | |
function clearTrail() { | |
context.clearRect(0, 0, canvas.width, canvas.height); | |
} | |
function animate() { | |
requestAnimationFrame(animate); | |
clearTrail(); | |
//player.draw(); | |
player.update(); | |
projectiles.forEach(p => { | |
p.update(); | |
}); | |
} | |
function pressedUp() { | |
player.moveUp = true; | |
console.log('Pressed UP'); | |
} | |
function pressedDown() { | |
player.moveDown = true; | |
console.log('Pressed DOWN'); | |
} | |
function pressedRight() { | |
player.moveRight = true; | |
console.log('Pressed RIGHT'); | |
} | |
function pressedLeft() { | |
player.moveLeft = true; | |
console.log('Pressed LEFT'); | |
} | |
function releasedUp() { | |
player.moveUp = false; | |
console.log('Released UP'); | |
} | |
function releasedDown() { | |
player.moveDown = false; | |
console.log('Released DOWN'); | |
} | |
function releasedRight() { | |
player.moveRight = false; | |
console.log('Released RIGHT'); | |
} | |
function releasedLeft() { | |
player.moveLeft = false; | |
console.log('Released LEFT'); | |
} | |
window.addEventListener('click', (e) => { | |
const angleRad = Math.atan2(e.clientY - player.getY(), e.clientX - player.getX()); | |
console.log(angleRad); | |
const velocity = { x: Math.cos(angleRad), y: Math.sin(angleRad) }; | |
projectiles.push(new Projectile(player.getX(), player.getY(), 7, 'red', velocity)); | |
}); | |
document.addEventListener('keydown', function(event) { | |
const key = event.key; // "ArrowRight", "ArrowLeft", "ArrowUp", or "ArrowDown" | |
const { code } = event; | |
if (code === "KeyW") { // KeyA, KeyS, KeyD | |
pressedUp(); | |
} | |
if (code === "KeyS") { // KeyA, KeyS, KeyD | |
pressedDown(); | |
} | |
if (code === "KeyD") { // KeyA, KeyS, KeyD | |
pressedRight(); | |
} | |
if (code === "KeyA") { // KeyA, KeyS, KeyD | |
pressedLeft(); | |
} | |
switch (key) { | |
case "ArrowLeft": | |
pressedLeft(); | |
break; | |
case "ArrowRight": | |
pressedRight(); | |
break; | |
case "ArrowUp": | |
pressedUp(); | |
break; | |
case "ArrowDown": | |
pressedDown(); | |
break; | |
} | |
}); | |
document.addEventListener('keyup', function(event) { | |
const key = event.key; // "ArrowRight", "ArrowLeft", "ArrowUp", or "ArrowDown" | |
const { code } = event; | |
if (code === "KeyW") { // KeyA, KeyS, KeyD | |
releasedUp(); | |
} | |
if (code === "KeyS") { // KeyA, KeyS, KeyD | |
releasedDown(); | |
} | |
if (code === "KeyD") { // KeyA, KeyS, KeyD | |
releasedRight(); | |
} | |
if (code === "KeyA") { // KeyA, KeyS, KeyD | |
releasedLeft(); | |
} | |
switch (key) { | |
case "ArrowLeft": | |
pressedLeft(); | |
break; | |
case "ArrowRight": | |
pressedRight(); | |
break; | |
case "ArrowUp": | |
pressedUp(); | |
break; | |
case "ArrowDown": | |
pressedDown(); | |
break; | |
} | |
}); | |
animate(); |
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Video tutorial of Canvas game by Chris Courses: https://www.youtube.com/watch?v=eI9idPTT0c4