as3碰撞检测（两图重叠区）(例子)

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1 package
2 {
3
4      import flash.display.Sprite;
5      import flash.events.MouseEvent;
6      import ws.tink.display.HitTest;
7      import flash.geom.Rectangle;
8
9      public class ComplexIntersectionRectangle extends Sprite
10      {
11
12          private var _circle0         : Sprite;
13          private var _circle1         : Sprite;
14          private var _hit             : Boolean;
15          private var _intersection     : Sprite;
16
17          public function ComplexIntersectionRectangle()
18          {
19              super();
20
21              initialize();
22          }
23
24          private function initialize():void
25          {
26
27              _circle0 = new Sprite();
28              _circle0.x = 50;
29              _circle0.y = 100;
30              _circle0.addEventListener( MouseEvent.MOUSE_DOWN, onCircleMouseDown );
31              draw( _circle0, 0xFFFFFF );
32              addChild( _circle0 );
33
34              _circle1 = new Sprite();
35              _circle1.x = 250;
36              _circle1.y = 100;
37              _circle1.addEventListener( MouseEvent.MOUSE_DOWN, onCircleMouseDown );
38              draw( _circle1, 0xFFFFFF );
39              addChild( _circle1 );
40
41              _intersection = new Sprite();
42              addChild( _intersection );
43
44              _hit = false;
45
46              stage.addEventListener( MouseEvent.MOUSE_MOVE, onStageMouseMove );
47              stage.addEventListener( MouseEvent.MOUSE_UP, onStageMouseUp );
48          }
49
50          private function onCircleMouseDown( event:MouseEvent ):void
51          {
52             var circle:Sprite = Sprite( event.target );
53              circle.startDrag( false );
54          }
55
56          private function onStageMouseMove( event:MouseEvent ):void
57          {
58             var intersection:Rectangle = HitTest.complexIntersectionRectangle( _circle0, _circle1, 5 );
59             var hit:Boolean = ( intersection.width > 0 && intersection.height > 0 );
60
61              _intersection.graphics.clear();
62             if( hit )
63              {
64                  _intersection.graphics.beginFill( 0xFF0000, 0.5 );
65                  _intersection.graphics.drawRect( intersection.x, intersection.y, intersection.width, intersection.height );
66                  _intersection.graphics.endFill();
67              }
68
69             if( hit != _hit )
70              {
71                  _hit = hit;
72                 var color:Number = ( _hit ) ? 0x00FF00 : 0xFFFFFF;
73                  draw( _circle0, color );
74                  draw( _circle1, color );
75              }
76          }
77
78          private function onStageMouseUp( event:MouseEvent ):void
79          {
80              _circle0.stopDrag();
81              _circle1.stopDrag();
82          }
83
84          private function draw( circle:Sprite, color:Number ):void
85          {
86              circle.graphics.clear();
87              circle.graphics.beginFill( color, 1 )
88              circle.graphics.drawCircle( 0, 0, 25 );
89              circle.graphics.endFill();
90          }
91      }
92 }