javascript
/
three.js
镜像自地址 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 - Cameras - Orthographic Canvas Top Left Origin</title>
    <style>
    html, body {
        margin: 0;
        height: 100%;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    .split {
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      display: flex;
    }
    .split>div {
      width: 100%;
      height: 100%;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<script src="resources/threejs/r102/three.min.js"></script>
<script src="resources/threejs/r102/js/controls/OrbitControls.js"></script>
<script src="../3rdparty/dat.gui.min.js"></script>
<script>
'use strict';

/* global THREE */

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

  const left = 0;
  const right = 300;  // default canvas size
  const top = 0;
  const bottom = 150;  // defautl canvas size
  const near = -1;
  const far = 1;
  const camera = new THREE.OrthographicCamera(left, right, top, bottom, near, far);
  camera.zoom = 1;

  const scene = new THREE.Scene();
  scene.background = new THREE.Color('black');

  const loader = new THREE.TextureLoader();
  const textures = [
    loader.load('resources/images/flower-1.jpg'),
    loader.load('resources/images/flower-2.jpg'),
    loader.load('resources/images/flower-3.jpg'),
    loader.load('resources/images/flower-4.jpg'),
    loader.load('resources/images/flower-5.jpg'),
    loader.load('resources/images/flower-6.jpg'),
  ];
  const planeSize = 256;
  const planeGeo = new THREE.PlaneBufferGeometry(planeSize, planeSize);
  const planes = textures.map((texture) => {
    const planePivot = new THREE.Object3D();
    scene.add(planePivot);
    texture.magFilter = THREE.NearestFilter;
    const planeMat = new THREE.MeshBasicMaterial({
      map: texture,
      side: THREE.DoubleSide,
    });
    const mesh = new THREE.Mesh(planeGeo, planeMat);
    planePivot.add(mesh);
    // move plane so top left corner is origin
    mesh.position.set(planeSize / 2, planeSize / 2, 0);
    return planePivot;
  });

  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 render(time) {
    time *= 0.001;  // convert to seconds;

    if (resizeRendererToDisplaySize(renderer)) {
      camera.right = canvas.width;
      camera.bottom = canvas.height;
      camera.updateProjectionMatrix();
    }

    const xRange = Math.max(20, canvas.width - planeSize) * 2;
    const yRange = Math.max(20, canvas.height - planeSize) * 2;

    planes.forEach((plane, ndx) => {
      const speed = 180;
      const t = time * speed + ndx * 300;
      const xt = t % xRange;
      const yt = t % yRange;

      const x = xt < xRange / 2 ? xt : xRange - xt;
      const y = yt < yRange / 2 ? yt : yRange - yt;

      plane.position.set(x, y, 0);
    });

    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

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