javascript
/
three.js
镜像自地址 https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - vector - text</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 {
				font-family: Monospace;
				background-color: #f0f0f0;
				margin: 0px;
				overflow: hidden;
			}

			#info {
				position: absolute;
				top: 10px;
				width: 100%;
				text-align: center;
			}
		</style>
	</head>
	<body>
		<div id="info">
			<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - Resolution-Independent Vector Fonts. <a href="https://github.com/mrdoob/three.js/issues/4746">info</a>.
		</div>
		<script src="../build/three.js"></script>
		<script src="./js/controls/OrbitControls.js"></script>

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

		<script type="x-shader/x-fragment" id="fs">

			varying vec2 vUv;
			varying float flip;
			uniform vec3 color;

			float inCurve(vec2 uv) {
				return uv.x * uv.x - uv.y;
			}

			float delta = 0.1;

			void main() {
				float x = inCurve(vUv);

				if (x * flip > 0.) discard;
				gl_FragColor = vec4(color, 1.);
			}

		</script>

		<script type="x-shader/x-vertex" id="vs">

			varying vec2 vUv;
			attribute float invert;
			varying float flip;

			void main() {

				vUv = uv;
				flip = invert;
				vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
				gl_Position = projectionMatrix * mvPosition;

			}

		</script>


		<script>

			var stats;

			var camera, scene, renderer, controls;

			var group;

			var loader = new THREE.FontLoader();
			loader.load( 'fonts/helvetiker_regular.typeface.json', function ( font ) {

				init( font );
				animate();

			} );

			function init( font ) {

				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.set( 50, 100, 500 );

				controls = new THREE.OrbitControls( camera );
				controls.target.set( 50, 100, 0 );
				controls.update();

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xf0f0f0 );

				var theText = '&'; // i % & j b 8

				group = new THREE.Group();
				scene.add( group );

				var textMaterial = new THREE.MeshBasicMaterial( {
					color: new THREE.Color( 0, 0, 1 ),
					side: THREE.DoubleSide,
					wireframe: true
				} );

				var textShapes = font.generateShapes( theText, 180 );

				var geometry = new THREE.ShapeBufferGeometry( textShapes );

				var text = new THREE.Mesh( geometry, textMaterial );
				text.position.x = - 200;
				group.add( text );

				//

				var vA = new THREE.Vector2();
				var vB = new THREE.Vector2();
				var vDot = new THREE.Vector2();

				function processShape( path, reverse ) {

					var pts = []; // bigger area (convex hull)
					var pts2 = []; // smaller area (full solid shapes)
					var beziers = []; // quad bezier points
					var invert = [];
					var z;

					var wind;

					pts.push( path[ 0 ].getPoint( 0 ) );
					pts2.push( path[ 0 ].getPoint( 0 ) );

					for ( var i = 0; i < path.length; i ++ ) {

						var curve = path[ i ];
						if ( curve instanceof THREE.LineCurve ) {

							pts.push( curve.v2 );
							pts2.push( curve.v2 );

						} else if ( curve instanceof THREE.QuadraticBezierCurve ) {

							vA = vA.subVectors( curve.v1, curve.v0 );
							vB = vB.subVectors( curve.v2, curve.v1 );
							z = vA.x * vB.y - vA.y * vB.x; // z component of cross Production
							wind = z < 0; // clockwise/anticlock wind

							if ( wind ) {

								pts.push( curve.v1 );
								pts.push( curve.v2 );
								pts2.push( curve.v2 );

							} else {

											pts.push( curve.v2 );
											pts2.push( curve.v1 );
											pts2.push( curve.v2 );

							}

								var flip = wind ? 1 : - 1;
								// if (reverse) flip *= -1;

								invert.push( flip, flip, flip );
								beziers.push( curve.v0, curve.v1, curve.v2 );

							}

					}

					return {
						pts: pts,
						pts2: pts2,
						beziers: beziers,
						invert: invert
					};

				}

				var pts, pts2;
				var subshape;
				var convexhullShape;
				var solidShape;
				var convexhullShapeGroup = [];
				var solidShapeGroup = [];

				var beziers = [], invert = [];
				var process;
				var hole;

				for ( var s = 0; s < textShapes.length; s ++ ) {

					subshape = textShapes[ s ];
					process = processShape( subshape.curves );

					pts = process.pts;
					pts2 = process.pts2;
					beziers = beziers.concat( process.beziers );
					invert = invert.concat( process.invert );

					convexhullShape = new THREE.Shape( pts );
					solidShape = new THREE.Shape( pts2 );

					convexhullShapeGroup.push( convexhullShape );
					solidShapeGroup.push( solidShape );

					for ( var i = 0; i < subshape.holes.length; i ++ ) {

						hole = subshape.holes[ i ];

						process = processShape( hole.curves, true );

						pts = process.pts;
						pts2 = process.pts2;
						beziers = beziers.concat( process.beziers );
						invert = invert.concat( process.invert );

						convexhullShape.holes.push( new THREE.Shape( pts ) );
						solidShape.holes.push( new THREE.Shape( pts2 ) );

					}

				} // end of subshape

				var bezierGeometry = new THREE.BufferGeometry();
				var vertices = [];
				var uvs = [];

				for ( var i = 0; i < beziers.length; i ++ ) {

					var p = beziers[ i ];
					vertices.push( p.x, p.y, 0 );

				}

				for ( var i = 0; i < beziers.length; i += 3 ) {

					uvs.push( 0, 0,  0.5, 0, 1, 1   );

				}

				bezierGeometry.addAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
				bezierGeometry.addAttribute( 'uv', new THREE.Float32BufferAttribute( uvs, 2 ) );
				bezierGeometry.addAttribute( 'invert', new THREE.Float32BufferAttribute( invert, 1 ) );

				geometry = new THREE.ShapeBufferGeometry( convexhullShapeGroup );

				text = new THREE.Mesh( geometry, textMaterial );
				text.position.x = 200;
				group.add( text );

				geometry = new THREE.ShapeBufferGeometry( solidShapeGroup );

				text = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { color: new THREE.Color( 1, 0, 0 ), side: THREE.DoubleSide, wireframe: true } ) );
				text.position.x = 200;
				group.add( text );

				//

				var newMaterial = new THREE.ShaderMaterial( {
					uniforms: {
						color: { value: new THREE.Color( 0.45 * 0xffffff ) }
					},
					vertexShader: document.getElementById( 'vs' ).textContent,
					fragmentShader: document.getElementById( 'fs' ).textContent,
					side: THREE.DoubleSide
				} );

				text = new THREE.Mesh( bezierGeometry, newMaterial );
				text.rotation.y = Math.PI * 2;

				group.add( text );

				//


				geometry = new THREE.ShapeBufferGeometry( solidShapeGroup );

				text = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { color: 0.45 * 0xffffff, side: THREE.DoubleSide } ) );
				text.rotation.y = Math.PI * 2;

				group.add( text );

				//

				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 );

			}

			function onWindowResize() {

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

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

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>