hw2p helper

threejs 2D template

by zx22516969

HTML

<div id="info">THREE.JS 2D Template
  <br/>Left & right click to draw line</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script>

<!-- the following disable the regular right-button click -->
<script type="text/javascript">
  document.oncontextmenu = function() {
    return false;
  }

</script>

CSS

#info {
  position: absolute;
  top: 0px;
  width: 100%;
  padding: 10px;
  text-align: center;
  color: #ffff00
}

body {
  overflow: hidden;
}

JavaScript

var camera, scene, renderer;
var screenSize = 100;

var mouse = new THREE.Vector2();
var leftPt, rightPt; // Vector2
var flat=0;
var p1 = new Array(10);
var p2 = new Array(10);
var q1 = new Array(10);
var q2 = new Array(10);
//p1[0]=leftpt.x;
//p1[1]=rightpt.y;
//p2[0]=leftpt.x;
//p2[1]=rightpt.y;
/*var L1 = [p2[0]-p1[0] , p2[1]-p1[1]];
var L2 = [q1[0]-q2[0] , q1[1]-q2[1]];
var ins = L1[0]*L2[1] - L1[1]*L2[0];
var pi1 = [L2[1]/ins , (-1)*L1[1]/ins];
var pi2 = [(-1)*L2[0]/ins , L1[0]/ins];
var t = [q1[0]-p1[0] , q1[1]-p1[1]];
var st =[t[0]*pi1[0]*t[1]*pi2[0] , t[0]*pi1[1]+t[1]*pi2[1]];*/

init();
animate();

function init() {

	renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.setClearColor(0x888888);

  document.body.appendChild(renderer.domElement);
  window.addEventListener('resize', onWindowResize, false);
  window.addEventListener('mousedown', onDocumentMouseDown, false);

  scene = new THREE.Scene();

  var halfSize = screenSize / 2;
  camera = new THREE.OrthographicCamera(-halfSize, halfSize, halfSize, -halfSize, -10, 10);
  camera.position.z = 10;

  // draw border
  var material = new THREE.LineBasicMaterial({
    color: 0x0000ff
  });

  var geometry = new THREE.Geometry();
  var borderSize = halfSize * 0.8;
  geometry.vertices.push(
    new THREE.Vector3(-borderSize, -borderSize, 0),
    new THREE.Vector3(borderSize, -borderSize, 0),
    new THREE.Vector3(borderSize, borderSize, 0),
    new THREE.Vector3(-borderSize, borderSize, 0),
    new THREE.Vector3(-borderSize, -borderSize, 0));

  var border = new THREE.Line(geometry, material);
  scene.add(border);
  
  leftPt = null;
  rightPt = null;
}

function animate() {
  requestAnimationFrame(animate);
  renderer.render(scene, camera);
}

function onWindowResize() {
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(window.innerWidth, window.innerHeight);
}

function...