| /* 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! Powered By Sunday 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<M_angle && (M_angle-angle<180) ? -stepAngle : +stepAngle; } 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-------------------------- |
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