Created
August 24, 2020 13:38
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Canvas HTML General
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var canvas = document.getElementById('canvas'); | |
var ctx = canvas.getContext('2d'); | |
// var img = new Image(); | |
// img.src = 'https://source.unsplash.com/random'; | |
/** Function dégradée couleur */ | |
// for (let i = 0; i < 6; i++) { | |
// for (let j = 0; j < 6; j++) { | |
// ctx.fillStyle = `rgb(${255 - 46.5 * i}, ${255 - 46.5 * j}, ${42.5 * i})` | |
// ctx.fillRect(j * 25, i * 25, 25, 25) | |
// } | |
// } | |
/** Changement dimensions canvas fixe (non responsive) */ | |
// canvas.setAttribute('width', '500'); | |
// canvas.setAttribute('height', '300'); | |
/** Changement dimensions canvas responsive */ | |
canvas.width = window.innerWidth; | |
canvas.height = window.innerHeight; | |
window.addEventListener('resize', () => { | |
canvas.width = window.innerWidth; | |
canvas.height = window.innerHeight; | |
init(); | |
// ctx.drawImage(img, 50, 50); | |
}) | |
/** Rectangle */ | |
// ctx.fillRect(50, 50, 100, 50); | |
/** Carré */ | |
// ctx.fillRect(50, 50, 50, 50); | |
/** Triangle */ | |
// ctx.beginPath(); | |
// ctx.moveTo(75, 50); | |
// ctx.lineTo(100, 75); | |
// ctx.lineTo(100, 25); | |
// ctx.closePath(); | |
// ctx.stroke(); | |
/** Cercle */ | |
// ctx.beginPath(); | |
// ctx.arc(75, 75, 50, 0, 2 * Math.PI); | |
// ctx.fillStyle = 'red' | |
// ctx.fill(); | |
/** Text */ | |
// ctx.font = '40px serif'; | |
// ctx.strokeText('Hello world', 40, 80); | |
// ctx.fillText('Hello world', 40, 80); | |
/** variables pour RAF & click */ | |
// let x = 200; | |
// let y = 200; | |
// let v = 5; | |
/** variables pour Système solaire */ | |
let sun = new Image(); | |
let moon = new Image(); | |
let earth = new Image(); | |
sun.src = 'https://mdn.mozillademos.org/files/1456/Canvas_sun.png'; | |
moon.src = 'https://mdn.mozillademos.org/files/1443/Canvas_moon.png'; | |
earth.src = 'https://mdn.mozillademos.org/files/1429/Canvas_earth.png'; | |
const init = () => { | |
/** save & restore */ | |
// ctx.fillRect(0, 0, 150, 150); | |
// ctx.save() | |
// ctx.fillStyle = 'red'; | |
// ctx.fillRect(15, 15, 120, 120); | |
// ctx.save(); | |
// ctx.fillStyle = 'blue'; | |
// ctx.fillRect(30, 30, 90, 90); | |
// ctx.restore(); | |
// ctx.fillRect(45, 45, 60, 60); | |
/** Translate */ | |
// ctx.translate(50, 50); | |
// ctx.fillRect(0, 0, 100, 150); | |
// ctx.fillRect(100, 100, 100, 150); | |
/** Rotate */ | |
// ctx.beginPath(); | |
// ctx.arc(150, 150, 1, 0, 2 * Math.PI); | |
// ctx.stroke(); | |
// ctx.translate(150, 150); | |
// ctx.rotate(10 * Math.PI / 180); | |
// ctx.fillRect(50, 50, 100, 50); | |
/** Image */ | |
// img.addEventListener('load', () => { | |
// ctx.drawImage(img, 50, 50); | |
// }) | |
/** RequestAnimationFrame & click event */ | |
// requestAnimationFrame(init); | |
// ctx.clearRect(0, 0, innerWidth, innerHeight); | |
// ctx.beginPath(); | |
// ctx.arc(x, y, 60, 0, Math.PI * 2); | |
// ctx.strokeStyle = 'crimson'; | |
// ctx.stroke(); | |
// canvas.addEventListener('click', e => { | |
// x = e.clientX; | |
// y = e.clientY; | |
// }) | |
/** Système solaire */ | |
ctx.globalCompositeOperation = 'destination-over'; | |
ctx.clearRect(0, 0, 300, 300); | |
//dessin orbite terre | |
ctx.beginPath(); | |
ctx.strokeStyle = 'rgba(0,153,255,0.4)'; | |
ctx.arc(150, 150, 105, 0, Math.PI * 2); | |
ctx.stroke(); | |
ctx.save(); | |
ctx.translate(150,150); | |
let time = new Date(); | |
ctx.rotate(((2 * Math.PI / 60) * time.getSeconds()) + ((2 * Math.PI/60000 * time.getMilliseconds()))); | |
//mettre la terre sur orbite | |
ctx.translate(105,0); | |
ctx.drawImage(earth, -12, -12); | |
//lune | |
ctx.rotate(((2 * Math.PI / 6) * time.getSeconds()) + ((2 * Math.PI/6000 * time.getMilliseconds()))); | |
ctx.translate(0,28); | |
ctx.drawImage(moon, -3.5, -3.5); | |
//restore valeur defaut | |
ctx.restore(); | |
//dessin du soleil | |
ctx.drawImage(sun, 0, 0); | |
requestAnimationFrame(init); | |
} | |
init(); |
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<!DOCTYPE html> | |
<html lang="fr"> | |
<head> | |
<meta charset="UTF-8"> | |
<meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
<title>Canvas Course</title> | |
<style> | |
* { | |
margin: 0; | |
padding: 0; | |
} | |
html, body { | |
width: 100%; | |
height: 100%; | |
} | |
canvas { | |
display: block; | |
} | |
</style> | |
</head> | |
<body> | |
<canvas id="canvas"></canvas> | |
<script src="app.js"></script> | |
</body> | |
</html> |
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