Event detection in pixels

Package <br/> {</P> <p> Import flash. display. bitmapdata; <br/> Import flash. display. blendmode; <br/> Import flash. display. displayobject; <br/> Import flash. display. sprite; </P> <p> Import flash. geom. colortransform; <br/> Import flash. geom. matrix; <br/> Import flash. geom. point; <br/> Import flash. geom. rectangle; </P> <p> public class hittest <br/>{</P> <p>/* <br/> This method returns true/false <br/> * /<br/> publi C static function complexhittestobject (target1: displayobject, TARGET2: displayobject, accurracy: Number = 1): Boolean <br/>{< br/> return complexintersectionrectangle (target1, TARGET2, accurracy ). width! = 0; <br/>}</P> <p> Public static function intersectionrectangle (target1: displayobject, TARGET2: displayobject ): rectangle <br/>{< br/> // if either of the items don't have a reference to stage, then they are not in a display list <br/> // or if a simple hittestobject is false, they cannot be intersecting. <br/> If (! Target1.root |! Target2.root |! Target1.hittestobject (TARGET2) return New rectangle (); </P> <p> // get the bounds of each displayobject. <br/> var bounds1: rectangle = target1.getbounds (target1.root); <br/> var bounds2: rectangle = target2.getbounds (target2.root ); </P> <p> // determine Test Area Boundaries. <br/> var intersection: rectangle = new rectangle (); <br/> intersection. X = math. max (bounds1.x, bounds2.x); <br/> interse Ction. y = math. max (bounds1.y, bounds2.y); <br/> intersection. width = math. min (bounds1.x + bounds1.width)-intersection. x, (bounds2.x + bounds2.width)-intersection. x); <br/> intersection. height = math. min (bounds1.y + bounds1.height)-intersection. y, (bounds2.y + bounds2.height)-intersection. y); </P> <p> return intersection; <br/>}</P> <p> Public static function complexintersecti Onrectangle (target1: displayobject, TARGET2: displayobject, accurracy: Number = 1): rectangle <br/>{< br/> If (accurracy <= 0) throw new error ("argumenterror: Error #5001: invalid value for accurracy", 5001); </P> <p> // If a simple hittestobject is false, they cannot be intersecting. <br/> If (! Target1.hittestobject (TARGET2) return New rectangle (); </P> <p> var hitrectangle: rectangle = intersectionrectangle (target1, TARGET2 ); <br/> // if their boundaries are no interesecting, they cannot be intersecting. <br/> If (hitrectangle. width * accurracy <1 | hitrectangle. height * accurracy <1) return New rectangle (); </P> <p> var bitmapdata: bitmapdata = new bitmapdata (hitrectangle. width * ACC Urracy, hitrectangle. height * accurracy, false, 0x000000); </P> <p> // draw the first target. <br/> bitmapdata. draw (target1, hittest. getdrawmatrix (target1, hitrectangle, accurracy), new colortransform (1, 1, 1, 1,255,-255,-255,255); <br/> // overlay the second target. <br/> bitmapdata. draw (TARGET2, hittest. getdrawmatrix (TARGET2, hitrectangle, accurracy), new colortransform (1, 1, 1, 1, 255,255,255,255), blendmode. difference); </P> <p> // find the intersection. <br/> var intersection: rectangle = bitmapdata. getcolorboundsrect (0 xffffffff, 0xff00ffff); </P> <p> bitmapdata. dispose (); </P> <p> // alter width and positions to compensate for accurracy <br/> If (accurracy! = 1) <br/>{< br/> intersection. x/= accurracy; <br/> intersection. y/= accurracy; <br/> intersection. width/= accurracy; <br/> intersection. height/= accurracy; <br/>}</P> <p> intersection. X + = hitrectangle. x; <br/> intersection. Y + = hitrectangle. y; </P> <p> return intersection; <br/>}</P> <p> protected static function getdrawmatrix (target: displayobject, hitrectangle: rectangle, accurracy: number ): Matrix <br/> {<br/> var localtoglobal: point; <br/> var matrix: matrix; </P> <p> var rootconcatenatedmatrix: matrix = target. root. transform. concatenatedmatrix; </P> <p> localtoglobal = target. localtoglobal (new point (); <br/> matrix = target. transform. concatenatedmatrix; <br/> matrix. tx = localtoglobal. x-hitrectangle. x; <br/> matrix. ty = localtoglobal. y-hitrectangle. y; </P> <p> matrix. A = matrix. A /Rootconcatenatedmatrix. A; <br/> matrix. d = matrix. d/rootconcatenatedmatrix. D; <br/> If (accurracy! = 1) matrix. scale (accurracy, accurracy); </P> <p> return matrix; <br/>}</P> <p>}

Hittest.