[ActionScript 3.0] Perspective projection

The following example shows how to use perspective projection to create 3D space. The example shows how to projectionCenter modify the vanishing point and change the perspective projection of space through properties. After this modification, the recalculation is forced focalLength and fieldOfView (and its associated 3D space warp).

This example:

1. Create a sprite named center as a circle that contains a crosshair

2. Property that assigns the coordinates of the sprite to the properties of the center root transform property perspectiveProjection projectionCenter

3. Add an event listener for mouse events to invoke the modified projectionCenter handler so that center the object's location can be traced

4. Create a four-fold style box that will form the walls of the perspective space in these four boxes

When you test this example, projectiondragger.swf drag the circle to a different location. The vanishing point moves with the circle until the circle is released. When moving the center of the projection away from the center of the stage, observe the stretching and distortions that occur in the box that surrounds the space.

1  Package2 {3     ImportFlash.display.Sprite;4     ImportFlash.display.Shape;5     ImportFlash.geom.Point;6     Importflash.events.*;7      Public classProjectiondraggerextendsSprite8     {9         Private varCenter:sprite;Ten         Private varBoxpanel:shape; One         Private varIndrag:Boolean=false; A  -          Public functionProjectiondragger ():void -         { the createboxes (); - Createcenter (); -         } -          Public functionCreatecenter ():void +         { -             varCenterradius:int = 20; +  ACenter =NewSprite; at  -             //Circle -Center.graphics.lineStyle (1,0x000099); -Center.graphics.beginFill (0xcccccc,0.5); -Center.graphics.drawCircle (0,0, Centerradius); - Center.graphics.endFill (); in             //Cross hairs; -Center.graphics.moveTo (0, Centerradius); toCenter.graphics.lineTo (0,-Centerradius); +Center.graphics.moveTo (centerradius,0); -Center.graphics.lineTo (-centerradius,0); thecenter.x = 175; *CENTER.Y = 175; $Center.z = 0;Panax Notoginseng              This. AddChild (center); -  the Center.addeventlistener (mouseevent.mouse_down,startdragprojectioncenter); + Center.addeventlistener (mouseevent.mouse_up,stopdragprojectioncenter); A Center.addeventlistener (mouseevent.mouse_move,dodragprojectioncenter); theRoot.transform.perspectiveProjection.projectionCenter =NewPoint (CENTER.X,CENTER.Y); +         } -          Public functionCreateboxes ():void $         { $             //Createboxpanel (); -             varBoxwidth:int = 50; -             varBoxheight:int = 50; the             varNumlayers:int = 12; -             varDepthperlayer:int = 50;Wuyi  the             //var boxvec:vector.<shape> = new vector.<shape> (numlayers); -              for(varI:int = 0; i < numlayers; i++) { Wu                  This. AddChild (Createbox (150,50, (numlayers-i) * DEPTHPERLAYER,BOXWIDTH,BOXHEIGHT,0XCCCCFF)); -                  This. AddChild (Createbox (50,150, (numlayers-i) * DEPTHPERLAYER,BOXWIDTH,BOXHEIGHT,0XFFCCCC)); About                  This. AddChild (Createbox (250,150, (numlayers-i) * DEPTHPERLAYER,BOXWIDTH,BOXHEIGHT,0XCCFFCC)); $                  This. AddChild (Createbox (150,250, (numlayers-i) * DEPTHPERLAYER,BOXWIDTH,BOXHEIGHT,0XDDDDDD)); -             } -         } -  A          Public functionCreatebox (xpos:int=0,ypos:int=0,zpos:int=100,w:int=50,h:int=50,color:int=0xdddddd): Shape +         { the             varBox:shape =NewShape; -Box.graphics.lineStyle (2,0x666666); $Box.graphics.beginFill (color,1.0); theBox.graphics.drawRect (0,0, w,h); the Box.graphics.endFill (); thebox.x =XPos; theBOX.Y =YPos; -Box.z =Zpos; in             returnbox; the         } the          Public functionStartdragprojectioncenter (e:event) About         { the Center.startdrag (); theIndrag =true; the         } +  -          Public functionDodragprojectioncenter (e:event) the         {Bayi             if(Indrag) { theRoot.transform.perspectiveProjection.projectionCenter =NewPoint (CENTER.X,CENTER.Y); the             } -         } -  the          Public functionStopdragprojectioncenter (e:event) the         { the Center.stopdrag (); theRoot.transform.perspectiveProjection.projectionCenter =NewPoint (CENTER.X,CENTER.Y); -Indrag =false; the         } the     } the}

Effect

[ActionScript 3.0] Perspective projection