-
Notifications
You must be signed in to change notification settings - Fork 12
/
Copy pathcanvas_geometry_shapes.html
489 lines (429 loc) · 20.3 KB
/
canvas_geometry_shapes.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js canvas - geometry - shapes</title>
<meta charset="utf-8">
<!--
如果没有设置viewport的width的话，网页很可能会超出手机屏幕宽度，具体多宽，要看浏览器定义的默认宽度是多少
user-scalable=no，规定了用户不能缩放网页，但有些浏览器对该项支持不是很好，故需要设置minimum-scale和maximum-scale相同来限制用户缩放
-->
<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: 0px;
width: 100%;
padding: 5px;
text-align:center;
}
</style>
</head>
<body>
<canvas id="debug" style="position:absolute; left:100px"></canvas>
<div id="info"><a href="http://threejs.org" target="_blank">three.js</a> - shape geometry</div>
<script src="../build/three.js"></script>
<!--
想要使用CanvasRenderer，必须添加如下两个js文件
Projector.js顾名思义上将3d图像投影到Canvas("2d")上，如果没有该文件会报如下错误
THREE.Projector has been moved to /examples/js/renderers/Projector.js. three.js:42883:3
TypeError: THREE.RenderableVertex is not a constructor
-->
<script src="js/renderers/Projector.js"></script>
<script src="js/renderers/CanvasRenderer.js"></script>
<!--
统计插件(FPS，渲染时间，chrome内存使用率)，min表示js代码经过压缩
-->
<script src="js/libs/stats.min.js"></script>
<script>
var container, stats;
var camera, scene, renderer;
var group, text, plane;
var targetRotation = 0;
var targetRotationOnMouseDown = 0;
var mouseX = 0;
var mouseXOnMouseDown = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
/*
透视相机
PerspectiveCamera(fov, aspect, near, far)
fov(视场)：从相机位置能够看到的部分场景。推荐默认值45
aspect(长宽比)：渲染结果输出区域的横向长度和纵向长度的比值。推荐默认值window.innerWidth/window.innerHeight
near(近面)：定义从距离相机多近的地方开始渲染场景。推荐默认值0.1
far(远面)：定义相机可以从它所处的位置看多远。默认值1000
*/
camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 1000 );
//定义相机的位置，有如下两种方式。如果不设置的话，相机位置为默认的Vector3{x:0,y:0,z:0}
camera.position.set( 0, 150, 500 );
camera.position.y = 150;
camera.position.z = 500;
scene = new THREE.Scene();
/*
Group对象，实质就是一个Object3D对象，打包后对象可以一起操作。
打包过后，对象就有里层对象和外层对象，如上面例子中group是里层对象，line1和line2是外层对象。
里层对象相对外层对象作相对运动，即里层对象所有运动都是相对于外层对象而言的。
*/
group = new THREE.Group();
group.position.y = 50;
scene.add( group );
function addShape( shape, color, x, y, z, rx, ry, rz, s ) {
// flat shape
var geometry = new THREE.ShapeGeometry( shape );
/*
MeshBasicMaterial：与光照无关，仅根据材质的颜色或贴图来渲染物体
color：材质的颜色
map：材质的贴图
wireframe: 显示三角形线框还是显示面
side：可选的值有THREE.FrontSide(仅渲染正面)、THREE.BackSide(仅渲染背面)、THREE.DoubleSide(双面渲染)
overdraw:过渡描绘。如果用THREE.CanvasRenderer对象，有缝隙时需设置该值。例如当前如果使用0.5以下的值，三角形的分界线就很明显。但是使用WebGLRenderer则不会有分割线
*/
var material = new THREE.MeshBasicMaterial( { color: color, overdraw: 0.5 } );
//双面渲染，否则只会渲染单面
//material.side = THREE.doubleSide;
var mesh = new THREE.Mesh( geometry, material );
mesh.position.set( x, y, z );
//这里的旋转是绕着原点旋转
mesh.rotation.set( rx, ry, rz );
//这里的放大是将原坐标乘以一定的比例
mesh.scale.set( s, s, s );
group.add( mesh );
// line
var geometry = shape.createPointsGeometry();
//封口
geometry.vertices.push( geometry.vertices[ 0 ].clone() );
geometry.colors = [];
//var base = 0xff0000 / geometry.vertices.length;
for(var i=0; i<geometry.vertices.length; i++) {
//geometry.colors[i] = new THREE.Color(parseInt(base * i));
geometry.colors[i] = new THREE.Color(0xffffff);
geometry.colors[i].setHSL(i / geometry.vertices.length, 0.5, 0.5);
}
//WebGLRenderer不支持linewidth，只有CanvasRenderer才支持该属性
var material = new THREE.LineBasicMaterial( { linewidth: 10, color: 0x333333, transparent: true, vertexColors: THREE.VertexColors } );
var line = new THREE.Line( geometry, material );
line.position.set( x, y, z );
line.rotation.set( rx, ry, rz );
line.scale.set( s, s, s );
group.add( line );
//three.js:41585 THREE.ParticleBasicMaterial has been renamed to THREE.PointsMaterial.
//var material = new THREE.PointsMaterial( { size: 10, color: 0xff0000, program: programFill } );
/*
THREE.ParticleSystem has been renamed to THREE.Points.
此外，该对象只能在WebGLRenderer中显示
*/
//var points = new THREE.Points(pointsGeometry, material);
var doublePI = Math.PI * 2;
var programFill = function ( context ) {
context.beginPath();
context.arc( 0, 0, 5, 0, doublePI, true );
context.fill();
};
//WebGLRenderer不支持Sprite，只有CanvasRenderer才支持
//添加辅助点
function addAuxiliarySprite(vector, x, y, z, rz, s) {
//three.js:41564 THREE.Particle has been renamed to THREE.Sprite.
var sprite = new THREE.Sprite(new THREE.SpriteCanvasMaterial( { color: 0xff0000, program: programFill }));
var pos = vector.clone().rotateAround(new THREE.Vector2(0, 0), rz);
sprite.position.set(pos.x, pos.y, 0);
sprite.position.multiplyScalar(s);
sprite.position.add(new THREE.Vector3(x, y, z));
group.add(sprite);
}
for(var i=0; i<shape.curves.length; i++) {
var curve = shape.curves[i];
if(curve instanceof THREE.LineCurve) {
//2, function LineCurve( v1, v2 )
addAuxiliarySprite(curve.v1, x, y, z, rz, s);
addAuxiliarySprite(curve.v2, x, y, z, rz, s);
} else if(curve instanceof THREE.QuadraticBezierCurve) {
//3, function QuadraticBezierCurve( v0, v1, v2 )
addAuxiliarySprite(curve.v0, x, y, z, rz, s);
addAuxiliarySprite(curve.v1, x, y, z, rz, s);
addAuxiliarySprite(curve.v2, x, y, z, rz, s);
} else if(curve instanceof THREE.CubicBezierCurve) {
//4, function CubicBezierCurve( v0, v1, v2, v3 )
addAuxiliarySprite(curve.v0, x, y, z, rz, s);
addAuxiliarySprite(curve.v1, x, y, z, rz, s);
addAuxiliarySprite(curve.v2, x, y, z, rz, s);
addAuxiliarySprite(curve.v3, x, y, z, rz, s);
} else if(curve instanceof THREE.SplineCurve) {
//1, function SplineCurve( points /* array of Vector2 */ )
for(var j=0;j<curve.points.length;j++) {
addAuxiliarySprite(curve.points[j], x, y, z, rz, s);
}
} else if(curve instanceof THREE.ArcCurve) {
//6, function ArcCurve( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise )
addAuxiliarySprite(new THREE.Vector2(curve.aX, curve.aY), x, y, z, rz, s);
} else if(curve instanceof THREE.EllipseCurve) {
//8, function EllipseCurve( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation )
addAuxiliarySprite(new THREE.Vector2(curve.aX, curve.aY), x, y, z, rz, s);
} else {
//输出"函数名"和"参数个数"
console.log(curve.constructor.name + "(" + curve.constructor.length + ")");
}
}
}
// California
var californiaPts = [];
californiaPts.push( new THREE.Vector2 ( 610, 320 ) );
californiaPts.push( new THREE.Vector2 ( 450, 300 ) );
californiaPts.push( new THREE.Vector2 ( 392, 392 ) );
californiaPts.push( new THREE.Vector2 ( 266, 438 ) );
californiaPts.push( new THREE.Vector2 ( 190, 570 ) );
californiaPts.push( new THREE.Vector2 ( 190, 600 ) );
californiaPts.push( new THREE.Vector2 ( 160, 620 ) );
californiaPts.push( new THREE.Vector2 ( 160, 650 ) );
californiaPts.push( new THREE.Vector2 ( 180, 640 ) );
californiaPts.push( new THREE.Vector2 ( 165, 680 ) );
californiaPts.push( new THREE.Vector2 ( 150, 670 ) );
californiaPts.push( new THREE.Vector2 ( 90, 737 ) );
californiaPts.push( new THREE.Vector2 ( 80, 795 ) );
californiaPts.push( new THREE.Vector2 ( 50, 835 ) );
californiaPts.push( new THREE.Vector2 ( 64, 870 ) );
californiaPts.push( new THREE.Vector2 ( 60, 945 ) );
californiaPts.push( new THREE.Vector2 ( 300, 945 ) );
californiaPts.push( new THREE.Vector2 ( 300, 743 ) );
californiaPts.push( new THREE.Vector2 ( 600, 473 ) );
californiaPts.push( new THREE.Vector2 ( 626, 425 ) );
californiaPts.push( new THREE.Vector2 ( 600, 370 ) );
californiaPts.push( new THREE.Vector2 ( 610, 320 ) );
//shape是二维几何体，和SVG中的path功能类似。数组参数相当于逐个lineTo
var californiaShape = new THREE.Shape( californiaPts );
// Triangle
var triangleShape = new THREE.Shape();
triangleShape.moveTo( 80, 20 );
triangleShape.lineTo( 40, 80 );
triangleShape.lineTo( 120, 80 );
triangleShape.lineTo( 80, 20 ); // close path
// Heart
var x = 0, y = 0;
var heartShape = new THREE.Shape(); // From http://blog.burlock.org/html5/130-paths
heartShape.moveTo( x + 25, y + 25 );
heartShape.bezierCurveTo( x + 25, y + 25, x + 20, y, x, y );
heartShape.bezierCurveTo( x - 30, y, x - 30, y + 35,x - 30,y + 35 );
heartShape.bezierCurveTo( x - 30, y + 55, x - 10, y + 77, x + 25, y + 95 );
heartShape.bezierCurveTo( x + 60, y + 77, x + 80, y + 55, x + 80, y + 35 );
heartShape.bezierCurveTo( x + 80, y + 35, x + 80, y, x + 50, y );
heartShape.bezierCurveTo( x + 35, y, x + 25, y + 25, x + 25, y + 25 );
// Square
var sqLength = 80;
var squareShape = new THREE.Shape();
squareShape.moveTo( 0,0 );
squareShape.lineTo( 0, sqLength );
squareShape.lineTo( sqLength, sqLength );
squareShape.lineTo( sqLength, 0 );
squareShape.lineTo( 0, 0 );
// Rectangle
var rectLength = 120, rectWidth = 40;
var rectShape = new THREE.Shape();
rectShape.moveTo( 0,0 );
rectShape.lineTo( 0, rectWidth );
rectShape.lineTo( rectLength, rectWidth );
rectShape.lineTo( rectLength, 0 );
rectShape.lineTo( 0, 0 );
// Rounded rectangle，lineTo负责直线部分，quadraticCurveTo负责圆角部分
var roundedRectShape = new THREE.Shape();
( function roundedRect( ctx, x, y, width, height, radius ){
ctx.moveTo( x, y + radius );
ctx.lineTo( x, y + height - radius );
ctx.quadraticCurveTo( x, y + height, x + radius, y + height );
ctx.lineTo( x + width - radius, y + height) ;
ctx.quadraticCurveTo( x + width, y + height, x + width, y + height - radius );
ctx.lineTo( x + width, y + radius );
ctx.quadraticCurveTo( x + width, y, x + width - radius, y );
ctx.lineTo( x + radius, y );
ctx.quadraticCurveTo( x, y, x, y + radius );
} )( roundedRectShape, 0, 0, 50, 50, 20 );
// Circle，需要的点是该圆的外切正方形
var circleRadius = 40;
var circleShape = new THREE.Shape();
circleShape.moveTo( 0, circleRadius );
circleShape.quadraticCurveTo( circleRadius, circleRadius, circleRadius, 0 );
circleShape.quadraticCurveTo( circleRadius, -circleRadius, 0, -circleRadius );
circleShape.quadraticCurveTo( -circleRadius, -circleRadius, -circleRadius, 0 );
circleShape.quadraticCurveTo( -circleRadius, circleRadius, 0, circleRadius );
// Fish
x = y = 0;
var fishShape = new THREE.Shape();
fishShape.moveTo(x,y);
fishShape.quadraticCurveTo(x + 50, y - 80, x + 90, y - 10);
fishShape.quadraticCurveTo(x + 100, y - 10, x + 115, y - 40);
fishShape.quadraticCurveTo(x + 115, y, x + 115, y + 40);
fishShape.quadraticCurveTo(x + 100, y + 10, x + 90, y + 10);
fishShape.quadraticCurveTo(x + 50, y + 80, x, y);
// Arc circle
var arcShape = new THREE.Shape();
arcShape.moveTo( 50, 10 );
//arc是相对当前位置，而absarc是绝对位置
arcShape.absarc( 10, 10, 40, 0, Math.PI*2, false );
//shape.holes，定义了一个路径数组，指在原来的形状上挖洞
var holePath = new THREE.Path();
holePath.moveTo( 20, 10 );
holePath.absarc( 10, 10, 10, 0, Math.PI*2, true );
//shape.curves和shape.holes都是array。curves存放的是Curve的子类，holes存放的是Path。
arcShape.holes.push( holePath );
// Smiley
var smileyShape = new THREE.Shape();
smileyShape.moveTo( 80, 40 );
smileyShape.absarc( 40, 40, 40, 0, Math.PI*2, false );
var smileyEye1Path = new THREE.Path();
smileyEye1Path.moveTo( 35, 20 );
// smileyEye1Path.absarc( 25, 20, 10, 0, Math.PI*2, true );
smileyEye1Path.absellipse( 25, 20, 10, 10, 0, Math.PI*2, true );
smileyShape.holes.push( smileyEye1Path );
var smileyEye2Path = new THREE.Path();
smileyEye2Path.moveTo( 65, 20 );
smileyEye2Path.absarc( 55, 20, 10, 0, Math.PI*2, true );
smileyShape.holes.push( smileyEye2Path );
var smileyMouthPath = new THREE.Path();
// ugly box mouth
/*
smileyMouthPath.moveTo( 20, 40 );
smileyMouthPath.lineTo( 60, 40 );
smileyMouthPath.lineTo( 60, 60 );
smileyMouthPath.lineTo( 20, 60 );
smileyMouthPath.lineTo( 20, 40 );
*/
smileyMouthPath.moveTo( 20, 40 );
smileyMouthPath.quadraticCurveTo( 40, 60, 60, 40 );
smileyMouthPath.bezierCurveTo( 70, 45, 70, 50, 60, 60 );
smileyMouthPath.quadraticCurveTo( 40, 80, 20, 60 );
smileyMouthPath.quadraticCurveTo( 5, 50, 20, 40 );
smileyShape.holes.push( smileyMouthPath );
// Spline shape + path extrusion
var splinepts = [];
splinepts.push( new THREE.Vector2 ( 350, 100 ) );
splinepts.push( new THREE.Vector2 ( 400, 450 ) );
splinepts.push( new THREE.Vector2 ( -140, 350 ) );
splinepts.push( new THREE.Vector2 ( 0, 0 ) );
var splineShape = new THREE.Shape( );
splineShape.moveTo( 0, 0 );
//沿着提供的点集绘制一条光滑的曲线。
splineShape.splineThru( splinepts );
// addShape( shape, color, x, y, z, rx, ry, rz, s );
addShape( californiaShape, 0xffaa00, -300, -100, 0, 0, 0, 0, 0.25 );
addShape( triangleShape, 0xffee00, -180, 0, 0, 0, 0, 0, 1 );
addShape( roundedRectShape, 0x005500, -150, 150, 0, 0, 0, 0, 1 );
addShape( squareShape, 0x0055ff, 150, 100, 0, 0, 0, 0, 1 );
addShape( heartShape, 0xff1100, 60, 100, 0, 0, 0, Math.PI, 1 );
addShape( circleShape, 0x00ff11, 120, 250, 0, 0, 0, 0, 1 );
addShape( fishShape, 0x222222, -60, 200, 0, 0, 0, 0, 1 );
addShape( smileyShape, 0xee00ff, -200, 250, 0, 0, 0, Math.PI, 1 );
addShape( arcShape, 0xbb4422, 150, 0, 0, 0, 0, 0, 1 );
addShape( splineShape, 0x888888, -50, -100, 0, 0, 0, 0, 0.2 );
renderer = new THREE.CanvasRenderer();
//设置渲染器的"清除色"和"透明度"
renderer.setClearColor( 0xf0f0f0 );
//设置屏幕像素比，与Android上的DIP相仿，作用是在所有设备上的显示效果都相近
renderer.setPixelRatio( window.devicePixelRatio );
//设置待渲染场景的大小
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.sortElements = false;
//将渲染器的DOM元素(即Canvas)添加到HTML中
container.appendChild( renderer.domElement );
//左上角的统计信息(FPS，渲染时间，chrome内存使用率)
stats = new Stats();
//这里注意，统计插件的dom元素是"dom"，而不是domElement
container.appendChild( stats.dom );
/*
element.addEventListener(event, function, useCapture)
useCapture，可选。true：事件句柄在捕获阶段执行；false：默认，事件句柄在冒泡阶段执行
*/
//mouse事件是针对PC浏览器的
document.addEventListener( 'mousedown', onDocumentMouseDown, false );
//touch事件是针对手持设备的
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
windowHalfX = window.innerWidth / 2;
windowHalfY = window.innerHeight / 2;
//重新设置相机的宽高比。如果宽高比不对，那么正方形可能就不是正方形了
camera.aspect = window.innerWidth / window.innerHeight;
//更新透视相机的投影矩阵
camera.updateProjectionMatrix();
//更新待渲染场景的大小
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onDocumentMouseDown( event ) {
//通知 Web 浏览器不要执行与事件关联的默认动作(如果存在这样的动作)
event.preventDefault();
//在mousedown的时候动态绑定事件
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'mouseup', onDocumentMouseUp, false );
document.addEventListener( 'mouseout', onDocumentMouseOut, false );
mouseXOnMouseDown = event.clientX - windowHalfX;
targetRotationOnMouseDown = targetRotation;
}
function onDocumentMouseMove( event ) {
/*
html的坐标轴是以左上角为(0,0)，右下方向为正方向
event.clientX=event.pageX返回当事件被触发时鼠标指针向对于浏览器可见区域的X坐标
event.offsetX返回当前事件相对于事件源元素（srcElement）的X坐标
event.screenX鼠标相对于用户显示器屏幕左上角的X坐标
*/
mouseX = event.clientX - windowHalfX;
//每一次旋转都从mousedown的角度开始计算
targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;
}
function onDocumentMouseUp( event ) {
//在mouseUp的时候解绑定相应事件
document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
}
function onDocumentMouseOut( event ) {
//鼠标移出该区域的时候解除相应的事件绑定
document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
}
function onDocumentTouchStart( event ) {
/*
event.touches存放的是多指触碰时的位置数组
三个等号是恒等，比较数值的同时也比较类型。
这里限制只有单指触摸的时候才执行相应的方法
*/
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
targetRotationOnMouseDown = targetRotation;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;
}
}
function animate() {
requestAnimationFrame( animate );
render();
//这里可以在render前后使用stats.begin和stats.end，也可以在每次渲染的时候调用一次stats.update
stats.update();
}
function render() {
/*
将旋转的角度按右手螺旋定则更新到原旋转角上
rotation.y是绕Y轴旋转
rotation.y其实是关于mouseX一元一次线性函数
*/
group.rotation.y += ( targetRotation - group.rotation.y ) * 0.05;
renderer.render( scene, camera );
}
</script>
</body>
</html>