JS版box2d点击获取刚体

Question

在canvas起点在（0,0）时已经可以点击获取刚体，但是当canvas起点不在（0,0）时则无法获取，求指点？

Answer 1

canvas起点为(0,0)时代码如下
GetBodyClass.prototype.getBodyByClick=function(event){
   
   var x = event.layerX;
   if(!x) x = event.x;
   var y = event.layerY;
   if(!y) y = event.y;
   var canvasClickX=x-this.dis_left-this.canvasBorder;
   var canvasClickY=y-this.dis_top-this.canvasBorder;
   this.mousePVec= new b2Vec2(canvasClickX, canvasClickY);
   this.aabb= new b2AABB();
   this.aabb.minVertex.Set(this.mousePVec.x - 0.001, this.mousePVec.y - 0.001);
   this.aabb.maxVertex.Set(this.mousePVec.x + 0.001, this.mousePVec.y + 0.001);
   var k_maxCount= 10;
   var shapes= new Array();
   var count= this.world.Query(this.aabb, shapes, k_maxCount);
   
   var findBody= null;
   for (var i= 0; i < count; ++i)
   {
  if (shapes[i].GetBody().IsStatic() == false )
  {
 var tShape= shapes[i];
 var inside=tShape.GetBody();
 if (inside)
 {
findBody = tShape.GetBody();
break;
 }//if
  }//if
   }//for i
this.slectBody=findBody;
};