/**
 * 矩形區(qū)域碰撞檢測(cè)
 * Created by Administrator on 14-4-7.
 * author: marker
 */
function Rectangle(x, y, _width, _height){
  this.x = x;
  this.y = y; 
  this.width = _width;
  this.height = _height;
   
  //碰撞檢測(cè)(參數(shù)為此類(lèi))
  this.intersects = function(obj){
    var a_x_w = Math.abs((this.x+this.width/2) - (obj.x+obj.width/2));
    var b_w_w = Math.abs((this.width+obj.width)/2);
    var a_y_h = Math.abs((this.y+this.height/2) - (obj.y+obj.height/2)); 
    var b_h_h = Math.abs((this.height+obj.height)/2);
    if( a_x_w < b_w_w && a_y_h < b_h_h ) return true;
    else return false;
  }
 
}

/**
 * 圓形區(qū)域碰撞檢測(cè)
 * Created by Administrator on 14-4-7.
 * author: marker
 *
 */
function RadiusRectangle(x, y, radius){
  this.x = x;
  this.y = y;
  this.radius = radius;
 
  //碰撞檢測(cè)(參數(shù)為此類(lèi))
  this.intersects = function(rr){
    var maxRadius = rr.radius + this.radius;
    // 已知兩條直角邊的長(zhǎng)度 ，可按公式：c²=a²+b² 計(jì)算斜邊。
    var a = Math.abs(rr.x - this.x);
    var b = Math.abs(rr.y - this.y);
    var distance = Math.sqrt(Math.pow(a,2) + Math.pow(b,2));// 計(jì)算圓心距離
    if(distance < maxRadius){
      return true;
    }
    return false;
  }
}