基于as3实现的简单3d地球

最新推荐文章于 2021-05-25 21:17:39 发布

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最新推荐文章于 2021-05-25 21:17:39 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/sun11086/archive/2009/03/04/1403091.html

本文介绍了一个使用ActionScript 3 (AS3) 实现的图像球体绘制项目。通过构建三角网格并应用位图填充，实现了围绕x轴旋转的球体效果。文章提供了完整的源代码，并介绍了关键的数据结构和绘制方法。

经过我一天的努力总算是弄好了哈哈虽然很菜，但是总算弄出个东西了，这个是以x轴为中心点转动，暂时没有加进交互。

Code
  1 package
  2 {
  3     import __AS3__.vec.Vector;
  4
  5     import flash.display.Bitmap;
  6     import flash.display.Sprite;
  7     import flash.display.StageAlign;
  8     import flash.display.StageScaleMode;
  9     import flash.display.TriangleCulling;
10     import flash.events.Event;
11
12     [SWF(backgroundColor=0x000000, width=800, height=800)]
13     public class ImageSphere1 extends Sprite
14     {
15         [Embed(source="map.jpg")]
16         private var ImageClass:Class;
17
18         private var vertices:Vector.<Number> = new Vector.<Number>();
19         private var indices:Vector.<int> = new Vector.<int>();
20         private var uvtData:Vector.<Number> = new Vector.<Number>();
21         private var bitmap:Bitmap;
22         private var sprite:Sprite;
23         private var centerZ:int = 500;
24         private var cols:int = 20;
25         private var rows:int =20;
26         private var focalLength:Number = 1000;
27         private var radius:Number = 200;
28         private var offset:int = 0;
29         private var zSaver:Array=[];
30         private var xSaver:Array=[];
31         private var ySaver:Array=[];
32         private var DAngle:Number = .02;
33         public function ImageSphere1()
34         {
35             stage.align = StageAlign.TOP_LEFT;
36             stage.scaleMode = StageScaleMode.NO_SCALE;
37
38             sprite = new Sprite();
39             sprite.x = 400;
40             sprite.y = 400;
41             addChild(sprite);
42
43             bitmap= new ImageClass() as Bitmap;
44             makeTriangles();
45
46
47         }
48
49     private function onEnterFrame(event:Event):void
50         {
51             draws();
52         }
53
54
55         private function makeTriangles():void
56         {   vertices.length = 0;
57             uvtData.length = 0;
58             var zpos:Number =0;
59             var ypos:Number =0;
60             var xpos:Number = 0;
61             for(var i:int = 0; i < rows; i++)
62             {
63                 for(var j:int = 0; j < cols; j++)
64                 {
65                     if(i < rows - 1 && j < cols - 1)
66                     {
67                         indices.push(i * cols + j,
68                                      i * cols + j + 1,
69                                     (i + 1) * cols + j);
70
71                         indices.push(i * cols + j + 1,
72                                     (i + 1) * cols + j + 1,
73                                     (i + 1) * cols + j);
74
75                     }
76
77                         var angle:Number =Math.PI *2/ (rows - 1) * j;
78                         var dR:Number=2*radius/(rows-1);
79                         var scale:Number =0;
80
81                                  ypos=   radius-i*dR;
82                                  ySaver.push(ypos);
83
84                                  zpos= Math.cos(angle)*Math.sqrt(radius*radius-ypos*ypos);
85                                  zSaver.push(zpos);
86
87                                  xpos= Math.sin(angle)*Math.sqrt(radius*radius-ypos*ypos);
88                                  xSaver.push(xpos);
89
90                                   scale= focalLength / (focalLength + zpos + centerZ);
91                                  vertices.push(xpos * scale, ypos * scale);
92
93                                  uvtData.push(j / (cols - 1), i / (rows - 1));
94                                  uvtData.push(scale);
95
96
97                 }//for
98             }//for
99
100             sprite.graphics.clear();
101
102
103         sprite.graphics.lineStyle(1, 5, .8);
104         //graphics.beginFill(0xFF8F05);
105         sprite.graphics.drawTriangles(vertices, indices, uvtData);
106          trace("ini is:",vertices);
107              addEventListener(Event.ENTER_FRAME, onEnterFrame);
108         }//f ends
109
110         private function draws():void
111         {
112
113             offset++;
114             if(offset>=1) {
115
116             offset=0;
117             vertices.length = 0;
118
119
120
121         for(var i:int = 0; i < zSaver.length; i++)
122             {
123
124
125                         ySaver[i]= Math.cos(DAngle)*ySaver[i]-Math.sin(DAngle)*zSaver[i];
126
127                         zSaver[i]= Math.cos(DAngle)*zSaver[i]+Math.sin(DAngle)*ySaver[i];
128
129                         var scale:Number= focalLength / (focalLength +  zSaver[i] + centerZ);
130                         vertices.push(xSaver[i] * scale, ySaver[i] * scale);
131                         if(i*3+2<=uvtData.length) uvtData[i*3+2]=scale;
132
133             }
134
135             sprite.graphics.clear();
136
137             sprite.graphics.beginBitmapFill(bitmap.bitmapData);
138             //sprite.graphics.beginFill(0x628f06);
139             //
140             sprite.graphics.drawTriangles(vertices, indices,uvtData, TriangleCulling.NEGATIVE);
141             sprite.graphics.endFill();
142            // sprite.graphics.lineStyle(1, 5, .8);
143             //graphics.beginFill(0xFF8F05);
144             //sprite.graphics.drawTriangles(vertices, indices, uvtData, TriangleCulling.NEGATIVE);
145             trace(uvtData.length);
146             trace(zSaver.length);
147             }
148         }//f end
149
150     }
151 }

转载于:https://www.cnblogs.com/sun11086/archive/2009/03/04/1403091.html