javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - Canvas Textured Cube</title>
    <style>
    html, body {
        height: 100%;
        margin: 0;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>

<script type="importmap">
{
  "imports": {
    "three": "../../build/three.module.js"
  }
}
</script>

<script type="module">
import * as THREE from 'three';

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas});

  const fov = 75;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 5;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.z = 2;

  const scene = new THREE.Scene();

  const boxWidth = 1;
  const boxHeight = 1;
  const boxDepth = 1;
  const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);

  const cubes = [];  // just an array we can use to rotate the cubes
  const ctx = document.createElement('canvas').getContext('2d');
  ctx.canvas.width = 256;
  ctx.canvas.height = 256;
  ctx.fillStyle = '#FFF';
  ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
  const texture = new THREE.CanvasTexture(ctx.canvas);

  const material = new THREE.MeshBasicMaterial({
    map: texture,
  });
  const cube = new THREE.Mesh(geometry, material);
  scene.add(cube);
  cubes.push(cube);  // add to our list of cubes to rotate

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

  function randInt(min, max) {
    if (max === undefined) {
      max = min;
      min = 0;
    }
    return Math.random() * (max - min) + min | 0;
  }

  function drawRandomDot() {
    ctx.fillStyle = `#${randInt(0x1000000).toString(16).padStart(6, '0')}`;
    ctx.beginPath();

    const x = randInt(256);
    const y = randInt(256);
    const radius = randInt(10, 64);
    ctx.arc(x, y, radius, 0, Math.PI * 2);
    ctx.fill();
  }

  function render(time) {
    time *= 0.001;

    if (resizeRendererToDisplaySize(renderer)) {
      const canvas = renderer.domElement;
      camera.aspect = canvas.clientWidth / canvas.clientHeight;
      camera.updateProjectionMatrix();
    }

    drawRandomDot();
    texture.needsUpdate = true;

    cubes.forEach((cube, ndx) => {
      const speed = .2 + ndx * .1;
      const rot = time * speed;
      cube.rotation.x = rot;
      cube.rotation.y = rot;
    });

    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

main();
</script>
</html>