cocosCreator A*寻路算法
作者:互联网
searchRoad(start_x,start_y,end_x,end_y){
var openList=[], //开启列表
closeList=[], //关闭列表
result=[], //结果数组
result_index; //结果数组在开启列表中的序号
openList.push({x:start_x,y:start_y,G:0});//把当前点加入到开启列表中,并且G是0
do{
var currentPoint = openList.pop();
closeList.push(currentPoint);
//console.log(currentPoint.x,currentPoint.y);
var surroundPoint=this.surroundPoint(currentPoint);
for(var i in surroundPoint) {
var item = surroundPoint[i]; //获得周围的四个点
if (
item.x>=0 && //判断是否在地图上
item.y>=0 &&
item.x<this.rows &&
item.y<this.cols &&
this.itemArr[item.x][item.y] != 1 && //判断是否是障碍物
!this.existList(item, closeList) ) { //判断是否在关闭列表中
//g 到父节点的位置
//如果是上下左右位置的则g等于10,斜对角的就是14
var g = currentPoint.G + (Math.abs(currentPoint.x - item.x) + Math.abs(currentPoint.y - item.y));
if (!this.existList(item, openList)) { //如果不在开启列表中
//计算H,通过水平和垂直距离进行确定
item['H'] = Math.abs(end_x - item.x) + Math.abs(end_y - item.y);
item['G'] = g;
item['F'] = item.H + item.G;
item['parent'] = currentPoint;
openList.push(item);
}
else { //存在在开启列表中,比较目前的g值和之前的g的大小
var index = this.existList(item, openList);
//如果当前点的g更小
if (g < openList[index].G) {
openList[index].parent = currentPoint;
openList[index].G = g;
openList[index].F=g+openList[index].H;
}
}
}
}
//如果开启列表空了,没有通路,结果为空
if(openList.length==0) {
break;
}
openList.sort(this.sortF);//这一步是为了循环回去的时候,找出 F 值最小的, 将它从 "开启列表" 中移掉
}while(!(result_index=this.existList({x:end_x,y:end_y},openList)));
//判断结果列表是否为空
if(!result_index) {
result=[];
}
else {
var currentObj=openList[result_index];
do{
//把路劲节点添加到result当中
result.unshift({
x:currentObj.x,
y:currentObj.y
});
currentObj=currentObj.parent;
}while (currentObj.x!=start_x || currentObj.y!=start_y);
}
return result;
},
//用F值对数组排序
sortF(a,b){
return b.F - a.F;
},
//获取周围四个点的值
surroundPoint(curPoint){
var x=curPoint.x,y=curPoint.y;
return [
{x:x,y:y-1},
{x:x+1,y:y},
{x:x,y:y+1},
{x:x-1,y:y}
]
},
//判断点是否存在在列表中,是的话返回的是序列号
existList(point,list) {
for(var i in list) {
if(point.x==list[i].x && point.y==list[i].y) {
return i;
}
}
return false;
},
标签:item,openList,cocosCreator,算法,currentPoint,var,surroundPoint,寻路,start 来源: https://www.cnblogs.com/jianxiaopo/p/12642406.html