跟踪导弹 @H_404_9@function(targetPosition){
// 让物体朝目标移动的方法 var speed = 5;
var targetPoint = targetPosition;
var thisPoint = cc.p(this.x,this.y);
//求两点的差值，其实就是两点的坐标相减 var delta = cc.pSub(targetPoint,thisPoint);
// 求当前对象和目标两点间的距离 var distance = cc.pDistance(thisPoint,targetPoint);
// 计算行走后的点xy坐标 var x2 = thisPoint.x +speed *delta.x /distance;
var y2 = thisPoint.y + speed *delta.y/distance;
if(100>=distance){
return true;
}
// 修改当前对象的位置 var newPosition = cc.p(x2,y2);
this.setPosition(newPosition);
// 旋转相应的角度 var x1 = thisPoint.x;
var y1 = thisPoint.y;
var deltaRotation = 90-Math.atan2(y2-y1,x2-x1)*180/Math.PI;
this.setRotation(deltaRotation);
return false;
}效果请看游戏地址 http://www.seraph-fd.cn/games/1/index.html 