算法
先看下效果吧：
代码如下：
/*
请教大家一个关于势函数用到追踪和拦截的算法
有研究过的能不能指点一下!
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Email:happyclub@163.com
*/
var stepAngle:Number = 3;
//角度最大增量
var tempNum:Number = 0;
var radius:Number = 100;
//导弹飞行半径
var M_speed:Number = 3;
//导弹速度(非常量)
var P_speed:Number = 5;
//飞机速度
findToHit(missile, target);
function findToHit(missile, target) {
missile.onEnterFrame = function() {
_root.AngText = stepAngle;
if (missile.hitTest(target.hit)) {
target.play();
missile._visible = false;
delete missile.onEnterFrame;
}
//---------------击中目标
tempNum++;
if (tempNum == 15) {
if (stepAngle == 2) {
if (Math.abs(target._x-missile._x)>radius*2 || Math.abs(target._y-missile._y)>radius*2) {
stepAngle = 3;
}
} else if ((Math.abs(target._x-missile._x)<30 || Math.abs(target._y-missile._y)<30)) {
stepAngle = 2;
}
tempNum = 0;
}
//---------------------改变角度增量-------------------------
P = new Object();
P.x = missile.way._x;
P.y = missile.way._y;
missile.localToGlobal(P);
dx = P.x-missile._x;
dy = P.y-missile._y;
dx1 = target._x-P.x;
dy1 = target._y-P.y;
//----------------------取得向量--------------------------
angle = Math.atan2(dy1, dx1)*180/Math.PI;
//-----------------------取得角度------------------------
angle = angle<=0 ? Math.abs(360+angle) : angle;
M_angle = missile._rotation<0 ? 360+missile._rotation : missile._rotation;
if (Math.abs(M_angle-angle)>stepAngle) {
if (angle-M_angle>180) {
M_angle += -stepAngle;
} else {
M_angle += angle } missile._rotation = M_angle; } //---------------------改变导弹角度----------------------- missile._x += dx*M_speed/10; missile._y += dy*M_speed/10; //-----------------------导弹移动--------------------- }; } //-----------------------------追踪--------------------- listen = new Object(); listen.onKeyDown = function() { onEnterFrame = function () { if (Key.isDown(Key.RIGHT)) { target._x += P_speed; } else if (Key.isDown(Key.LEFT)) { target._x -= P_speed; } else if (Key.isDown(Key.UP)) { target._y -= P_speed; } else if (Key.isDown(Key.DOWN)) { target._y += P_speed; } }; }; Key.addListener(listen); //----------------------------键盘控制-------------------------- 看看源文件：游戏中导弹追踪算法.rar