示例:透视投影Flash Player 10 和更高版本,Adobe AIR 1.5 和更高版本 下面的示例演示如何使用透视投影来创建 3D 空间。该示例演示如何通过 projectionCenter 属性来修改消失点和更改空间的透视投影。进行这种修改后,将强制重新计算 focalLength 和 fieldOfView(及其相关的 3D 空间扭曲)。 此示例:
在测试此示例时,ProjectionDragger.swf 将圆拖动到不同的位置。消失点将跟随圆移动,直到释放圆时才固定下来。在移动投影中心使其远离舞台中心时,观察包围空间的框所发生的拉伸和出现的扭曲。 若要获取此范例的应用程序文件,请参阅 www.adobe.com/go/learn_programmingAS3samples_flash_cn。在 Samples/ProjectionDragger 文件夹中可以找到 ProjectionDragger 应用程序文件。 package { import flash.display.Sprite; import flash.display.Shape; import flash.geom.Point; import flash.events.*; public class ProjectionDragger extends Sprite { private var center : Sprite; private var boxPanel:Shape; private var inDrag:Boolean = false; public function ProjectionDragger():void { createBoxes(); createCenter(); } public function createCenter():void { var centerRadius:int = 20; center = new Sprite(); // circle center.graphics.lineStyle(1, 0x000099); center.graphics.beginFill(0xCCCCCC, 0.5); center.graphics.drawCircle(0, 0, centerRadius); center.graphics.endFill(); // cross hairs center.graphics.moveTo(0, centerRadius); center.graphics.lineTo(0, -centerRadius); center.graphics.moveTo(centerRadius, 0); center.graphics.lineTo(-centerRadius, 0); center.x = 175; center.y = 175; center.z = 0; this.addChild(center); center.addEventListener(MouseEvent.MOUSE_DOWN, startDragProjectionCenter); center.addEventListener(MouseEvent.MOUSE_UP, stopDragProjectionCenter); center.addEventListener( MouseEvent.MOUSE_MOVE, doDragProjectionCenter); root.transform.perspectiveProjection.projectionCenter = new Point(center.x, center.y); } public function createBoxes():void { // createBoxPanel(); var boxWidth:int = 50; var boxHeight:int = 50; var numLayers:int = 12; var depthPerLayer:int = 50; // var boxVec:Vector.<Shape> = new Vector.<Shape>(numLayers); for (var i:int = 0; i < numLayers; i++) { this.addChild(createBox(150, 50, (numLayers - i) * depthPerLayer, boxWidth, boxHeight, 0xCCCCFF)); this.addChild(createBox(50, 150, (numLayers - i) * depthPerLayer, boxWidth, boxHeight, 0xFFCCCC)); this.addChild(createBox(250, 150, (numLayers - i) * depthPerLayer, boxWidth, boxHeight, 0xCCFFCC)); this.addChild(createBox(150, 250, (numLayers - i) * depthPerLayer, boxWidth, boxHeight, 0xDDDDDD)); } } public function createBox(xPos:int = 0, yPos:int = 0, zPos:int = 100, w:int = 50, h:int = 50, color:int = 0xDDDDDD):Shape { var box:Shape = new Shape(); box.graphics.lineStyle(2, 0x666666); box.graphics.beginFill(color, 1.0); box.graphics.drawRect(0, 0, w, h); box.graphics.endFill(); box.x = xPos; box.y = yPos; box.z = zPos; return box; } public function startDragProjectionCenter(e:Event) { center.startDrag(); inDrag = true; } public function doDragProjectionCenter(e:Event) { if (inDrag) { root.transform.perspectiveProjection.projectionCenter = new Point(center.x, center.y); } } public function stopDragProjectionCenter(e:Event) { center.stopDrag(); root.transform.perspectiveProjection.projectionCenter = new Point(center.x, center.y); inDrag = false; } } } 对于更加复杂的透视投影,请使用 Matrix3D 类。 |
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