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


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - materials - canvas texture</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				margin: 0px;
				background-color: #050505;
				color: #fff;
				overflow: hidden;
			}

			a { color: #e00 }

			#info {
				position: absolute;
				top: 0px; width: 100%;
				color: #ffffff;
				padding: 5px;
				font-family: Monospace;
				font-size: 13px;
				text-align: center;
				z-index: 1000;
			}

			#drawing-canvas {
				position: absolute;
				background-color: #000000;
				top: 0px;
				right: 0px;
				z-index: 3000;
				cursor: crosshair;
			}
		</style>
	</head>
	<body>

		<div id="info">
			<a href="http://threejs.org" target="_blank">three.js</a> - webgl - canvas as a texture
			<div>click and draw in the white box</div>
		</div>
		<canvas id="drawing-canvas" height="128" width="128"></canvas>

		<script src="../build/three.js"></script>

		<script src="js/Detector.js"></script>
		<script src="js/libs/stats.min.js"></script>

		<script>

			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

			var camera, scene, renderer, mesh, material;
			var drawStartPos = { x: 0, y: 0 };

			init();
			setupCanvasDrawing();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 2000 );
				camera.position.z = 400;

				scene = new THREE.Scene();

				geometry = new THREE.BoxGeometry( 200, 200, 200 );

				material = new THREE.MeshBasicMaterial();

				mesh = new THREE.Mesh( geometry, material );
				scene.add( mesh );

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				document.body.appendChild( renderer.domElement );

				stats = new Stats();
				document.body.appendChild( stats.dom );

				window.addEventListener( 'resize', onWindowResize, false );

			}
			
			// Sets up the drawing canvas and adds it as the material map.
			function setupCanvasDrawing() {
				// get canvas and context
				var drawingCanvas = document.getElementById( 'drawing-canvas' );
				var drawingContext = drawingCanvas.getContext( '2d' );

				// draw white background
				drawingContext.fillStyle = "#FFFFFF";
				drawingContext.fillRect( 0, 0, 128, 128 );

				// set canvas as material.map (this could be done to any map, bump, displacement etc.)
				material.map = new THREE.Texture( drawingCanvas );
				// need to flag the map as needing updating.
				material.map.needsUpdate = true;

				// set the variable to keep track of when to draw
				var paint = false;

				// add canvas event listeners
				drawingCanvas.addEventListener( 'mousedown', function( e ) {
					paint = true;
					drawStartPos = { x: e.offsetX, y: e.offsetY };
				} );

				drawingCanvas.addEventListener( 'mousemove', function( e ) {
					if(paint){
						draw( drawingContext, e.offsetX, e.offsetY );
					}
				} );

				drawingCanvas.addEventListener( 'mouseup', function( e ) {
					paint = false;
				} );
				
				drawingCanvas.addEventListener( 'mouseleave', function( e ) {
					paint = false;
				} );

			}

			function draw( drawContext, x, y ) {

				drawContext.moveTo( drawStartPos.x, drawStartPos.y );
				drawContext.strokeStyle = '#000000';
				drawContext.lineTo( x, y );
				drawContext.stroke();
				// reset drawing start position to current position.
				drawStartPos = { x: x, y: y };
				// need to flag the map as needing updating.
				material.map.needsUpdate = true;

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				requestAnimationFrame( animate );

				mesh.rotation.x += 0.01;
				mesh.rotation.y += 0.01;

				renderer.render( scene, camera );
				stats.update();

			}

		</script>

	</body>
</html>