Tutorial 03: 使用Camera3D

重點API：
sandy.core.scenegraph.Camera3D
sandy.core.data.Point3D
sandy.primitive.Line3D
sandy.primitive.Torus

1. package
2. {
3. import flash.display.InteractiveObject;
4. import flash.display.Sprite;
5. import flash.events.Event;
6. import flash.events.KeyboardEvent;
7. import flash.ui.Keyboard;
8. import sandy.core.data.Point3D;
9. import sandy.core.Scene3D;
10. import sandy.core.scenegraph.Camera3D;
11. import sandy.core.scenegraph.Group;
12. import sandy.materials.Appearance;
13. import sandy.materials.attributes.LightAttributes;
14. import sandy.materials.attributes.LineAttributes;
15. import sandy.materials.attributes.MaterialAttributes;
16. import sandy.materials.ColorMaterial;
17. import sandy.materials.Material;
18. import sandy.primitive.Line3D;
19. import sandy.primitive.Torus;
21. public class Example003 extends Sprite
22. {
23. private var scene:Scene3D;
24. private var camera:Camera3D;
26. public function Example003()
27. {
28. camera = new Camera3D(300, 300);
29. //camera.x = 100;
30. //camera.y = 100;
31. camera.z = -400;
32. // 使得 camera 物件朝某點拍攝
33. //camera.lookAt(0, 0, 0);
35. var root:Group = createScene();
37. scene = new Scene3D("scene", this, camera, root);
38. addEventListener(Event.ENTER_FRAME, enterFrameHandler);
39. // 為整個舞台添加鍵盤的 Key Down 事件聆聽器
40. stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
41. }
43. private function createScene():Group
44. {
45. var g:Group = new Group();
47. // 產生 3DLine 物件, 並設定其參數，分別為：
48. // 識別名稱，及 Point3D 物件以定議線條的折點
49. var myXLine:Line3D = new Line3D("x-coord", new Point3D( -50, 0, 0),
50. new Point3D(50, 0, 0));
51. var myYLine:Line3D = new Line3D("y-coord", new Point3D(0, -50, 0),
52. new Point3D(0, 50, 0));
53. var myZLine:Line3D = new Line3D("z-coord", new Point3D(0, 0, -50),
54. new Point3D(0, 0, 50));
56. // 產生 Torus 物件，並設定其參數，分別為：
57. // 識別名稱、大半徑及小半徑
58. var torus:Torus = new Torus("theTorus", 120, 20);
60. var materialAttr:MaterialAttributes = new MaterialAttributes(
61. new LineAttributes(0.5, 0x2111BB, 0.4),
62. new LightAttributes(true, 0.1)
63. );
65. var material:Material = new ColorMaterial(0xFFCC33, 1, materialAttr);
66. material.lightingEnable = true;
67. var app:Appearance = new Appearance(material);
69. // 將外觀物件套用到顯示物件 tours
70. torus.appearance = app;
72. torus.rotateX = 30;
73. torus.rotateY = 30;
75. // 將顯示物件加入舞台顯示群組中
76. g.addChild(myXLine);
77. g.addChild(myYLine);
78. g.addChild(myZLine);
79. g.addChild(torus);
81. return g;
82. }
84. private function enterFrameHandler(evt:Event):void
85. {
86. scene.render();
87. }
89. private function keyPressed(evt:KeyboardEvent):void
90. {
91. // 依據使用者所按下的鍵，做不用的處理
92. switch(evt.keyCode) {
93. case Keyboard.UP:
94. // 調整 camera 傾斜的幅度
95. camera.tilt += 2;
96. break;
97. case Keyboard.DOWN:
98. camera.tilt -= 2;
99. break;
100. case Keyboard.RIGHT:
101. // 調整 camera 沿Y軸轉向的幅度
102. camera.pan -= 2;
103. break;
104. case Keyboard.LEFT:
105. camera.pan += 2;
106. break;
107. case Keyboard.CONTROL:
108. // 調整 camera 沿Z軸卷動的幅度
109. camera.roll += 2;
110. break;
111. case Keyboard.PAGE_DOWN:
112. // 調整 camera 鏡頭的遠近幅度
113. camera.z -= 5;
114. break;
115. case Keyboard.PAGE_UP:
116. camera.z += 5;
117. break;
118. }
119. }
120. }
121. }

產出：



程式碼出處：http://www.flashsandy.org/tutorials/3.0/sandy_cs3_tut03