跟蹤導彈
function(targetPosition){
// 讓物體朝目標移動的方法
var speed = 5;
var targetPoint = targetPosition;
var thisPoint = cc.p(this.x, this.y);
//求兩點的差值,其實就是兩點的座標相減
var delta = cc.pSub(targetPoint, thisPoint);
// 求當前對象和目標兩點間的距離
var distance = cc.pDistance(thisPoint, targetPoint);
// 計算行走後的點xy座標
var x2 = thisPoint.x +speed *delta.x /distance;
var y2 = thisPoint.y + speed *delta.y/distance;
if(100>=distance){
return true;
}
// 修改當前對象的位置
var newPosition = cc.p(x2, y2);
this.setPosition(newPosition);
// 旋轉相應的角度
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;
}效果請看遊戲地址 http://www.seraph-fd.cn/games/1/index.html