tv_xiaoyouxi/games/xiaoshuai/js/7/ndgmr.Collision.js

this.ndgmr=this.ndgmr||{};(function(){var collisionCanvas=document.createElement('canvas');var collisionCtx=collisionCanvas.getContext('2d');collisionCtx.save();var collisionCanvas2=document.createElement('canvas');var collisionCtx2=collisionCanvas2.getContext('2d');collisionCtx2.save();var cachedBAFrames=[];var checkRectCollision=function(bitmap1,bitmap2){var b1,b2;b1=getBounds(bitmap1);b2=getBounds(bitmap2);return calculateIntersection(b1,b2);}
ndgmr.checkRectCollision=checkRectCollision;var checkPixelCollision=function(bitmap1,bitmap2,alphaThreshold,getRect){if(ndgmr.DEBUG||ndgmr.DEBUG_COLLISION){document.body.appendChild(collisionCanvas);document.body.appendChild(collisionCanvas2);}
getRect=getRect||false;var areObjectsCloseEnough,intersetion,imageData1,imageData2,pixelIntersection;areObjectsCloseEnough=_collisionDistancePrecheck(bitmap1,bitmap2);if(!areObjectsCloseEnough){return false;}
intersection=checkRectCollision(bitmap1,bitmap2);if(!intersection){return false;}
alphaThreshold=alphaThreshold||0;alphaThreshold=Math.min(0.99999,alphaThreshold);collisionCanvas.width=intersection.width;collisionCanvas.height=intersection.height;collisionCanvas2.width=intersection.width;collisionCanvas2.height=intersection.height;imageData1=_intersectingImagePart(intersection,bitmap1,collisionCtx,1);imageData2=_intersectingImagePart(intersection,bitmap2,collisionCtx2,2);pixelIntersection=_compareAlphaValues(imageData1,imageData2,intersection.width,intersection.height,alphaThreshold,getRect);if(pixelIntersection){pixelIntersection.x+=intersection.x;pixelIntersection.x2+=intersection.x;pixelIntersection.y+=intersection.y;pixelIntersection.y2+=intersection.y;}else{return false;}
return pixelIntersection;}
ndgmr.checkPixelCollision=checkPixelCollision;var _collisionDistancePrecheck=function(bitmap1,bitmap2){var ir1,ir2,b1,b2;b1=bitmap1.localToGlobal(0,0);b2=bitmap2.localToGlobal(0,0);ir1=bitmap1 instanceof createjs.Bitmap?{width:bitmap1.image.width,height:bitmap1.image.height}:bitmap1.spriteSheet.getFrame(bitmap1.currentFrame).rect;ir2=bitmap2 instanceof createjs.Bitmap?{width:bitmap2.image.width,height:bitmap2.image.height}:bitmap2.spriteSheet.getFrame(bitmap2.currentFrame).rect;return(Math.abs(b2.x-b1.x)<ir2.width*bitmap2.scaleX+ir1.width*bitmap1.scaleX&&Math.abs(b2.y-b1.y)<ir2.height*bitmap2.scaleY+ir1.height*bitmap2.scaleY)}
var _intersectingImagePart=function(intersetion,bitmap,ctx,i){var bl,image,frameName,sr;if(bitmap instanceof createjs.Bitmap){image=bitmap.image;}else if(bitmap instanceof createjs.Sprite){frame=bitmap.spriteSheet.getFrame(bitmap.currentFrame)
frameName=frame.image.src+':'+
frame.rect.x+':'+frame.rect.y+':'+
frame.rect.width+':'+frame.rect.height;if(cachedBAFrames[frameName]){image=cachedBAFrames[frameName];}else{cachedBAFrames[frameName]=image=createjs.SpriteSheetUtils.extractFrame(bitmap.spriteSheet,bitmap.currentFrame);}}
bl=bitmap.globalToLocal(intersetion.x,intersetion.y);ctx.restore();ctx.save();ctx.rotate(_getParentalCumulatedProperty(bitmap,'rotation')*(Math.PI/180));ctx.scale(_getParentalCumulatedProperty(bitmap,'scaleX','*'),_getParentalCumulatedProperty(bitmap,'scaleY','*'));ctx.translate(-bl.x-intersetion['rect'+i].regX,-bl.y-intersetion['rect'+i].regY);if((sr=bitmap.sourceRect)!=undefined){ctx.drawImage(image,sr.x,sr.y,sr.width,sr.height,0,0,sr.width,sr.height);}else{ctx.drawImage(image,0,0,image.width,image.height);}
return ctx.getImageData(0,0,intersetion.width,intersetion.height).data;}
var _compareAlphaValues=function(imageData1,imageData2,width,height,alphaThreshold,getRect){var alpha1,alpha2,x,y,offset=3,pixelRect={x:Infinity,y:Infinity,x2:-Infinity,y2:-Infinity};for(y=0;y<height;++y){for(x=0;x<width;++x){alpha1=imageData1.length>offset+1?imageData1[offset]/255:0;alpha2=imageData2.length>offset+1?imageData2[offset]/255:0;if(alpha1>alphaThreshold&&alpha2>alphaThreshold){if(getRect){if(x<pixelRect.x)pixelRect.x=x;if(x>pixelRect.x2)pixelRect.x2=x;if(y<pixelRect.y)pixelRect.y=y;if(y>pixelRect.y2)pixelRect.y2=y;}else{return{x:x,y:y,width:1,height:1};}}
offset+=4;}}
if(pixelRect.x!=Infinity){pixelRect.width=pixelRect.x2-pixelRect.x+1;pixelRect.height=pixelRect.y2-pixelRect.y+1;return pixelRect;}
return null;}
var _getParentalCumulatedProperty=function(child,propName,operation){operation=operation||'+';if(child.parent&&child.parent[propName]){var cp=child[propName];var pp=_getParentalCumulatedProperty(child.parent,propName,operation);if(operation=='*'){return cp*pp;}else{return cp+pp;}}
return child[propName];}
var calculateIntersection=function(rect1,rect2)
{var dx,dy,r1={},r2={};r1.cx=rect1.x+(r1.hw=(rect1.width/2));r1.cy=rect1.y+(r1.hh=(rect1.height/2));r2.cx=rect2.x+(r2.hw=(rect2.width/2));r2.cy=rect2.y+(r2.hh=(rect2.height/2));dx=Math.abs(r1.cx-r2.cx)-(r1.hw+r2.hw);dy=Math.abs(r1.cy-r2.cy)-(r1.hh+r2.hh);if(dx<0&&dy<0){dx=Math.min(Math.min(rect1.width,rect2.width),-dx);dy=Math.min(Math.min(rect1.height,rect2.height),-dy);return{x:Math.max(rect1.x,rect2.x),y:Math.max(rect1.y,rect2.y),width:dx,height:dy,rect1:rect1,rect2:rect2};}else{return null;}}
ndgmr.calculateIntersection=calculateIntersection;var getBounds=function(obj){var bounds={x:Infinity,y:Infinity,width:0,height:0};if(obj instanceof createjs.Container){bounds.x2=-Infinity;bounds.y2=-Infinity;var children=obj.children,l=children.length,cbounds,c;for(c=0;c<l;c++){cbounds=getBounds(children[c]);if(cbounds.x<bounds.x)bounds.x=cbounds.x;if(cbounds.y<bounds.y)bounds.y=cbounds.y;if(cbounds.x+cbounds.width>bounds.x2)bounds.x2=cbounds.x+cbounds.width;if(cbounds.y+cbounds.height>bounds.y2)bounds.y2=cbounds.y+cbounds.height;}
if(bounds.x==Infinity)bounds.x=0;if(bounds.y==Infinity)bounds.y=0;if(bounds.x2==Infinity)bounds.x2=0;if(bounds.y2==Infinity)bounds.y2=0;bounds.width=bounds.x2-bounds.x;bounds.height=bounds.y2-bounds.y;delete bounds.x2;delete bounds.y2;}else{var gp,gp2,gp3,gp4,imgr={},sr;if(obj instanceof createjs.Bitmap){sr=obj.sourceRect||obj.image;imgr.width=sr.width;imgr.height=sr.height;}else if(obj instanceof createjs.Sprite){if(obj.spriteSheet._frames&&obj.spriteSheet._frames[obj.currentFrame]&&obj.spriteSheet._frames[obj.currentFrame].image){var cframe=obj.spriteSheet.getFrame(obj.currentFrame);imgr.width=cframe.rect.width;imgr.height=cframe.rect.height;imgr.regX=cframe.regX;imgr.regY=cframe.regY;}else{bounds.x=obj.x||0;bounds.y=obj.y||0;}}else{bounds.x=obj.x||0;bounds.y=obj.y||0;}
imgr.regX=imgr.regX||0;imgr.width=imgr.width||0;imgr.regY=imgr.regY||0;imgr.height=imgr.height||0;bounds.regX=imgr.regX;bounds.regY=imgr.regY;gp=obj.localToGlobal(0-imgr.regX,0-imgr.regY);gp2=obj.localToGlobal(imgr.width-imgr.regX,imgr.height-imgr.regY);gp3=obj.localToGlobal(imgr.width-imgr.regX,0-imgr.regY);gp4=obj.localToGlobal(0-imgr.regX,imgr.height-imgr.regY);bounds.x=Math.min(Math.min(Math.min(gp.x,gp2.x),gp3.x),gp4.x);bounds.y=Math.min(Math.min(Math.min(gp.y,gp2.y),gp3.y),gp4.y);bounds.width=Math.max(Math.max(Math.max(gp.x,gp2.x),gp3.x),gp4.x)-bounds.x;bounds.height=Math.max(Math.max(Math.max(gp.y,gp2.y),gp3.y),gp4.y)-bounds.y;}
return bounds;}
ndgmr.getBounds=getBounds;}());