跟踪导弹
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