AS3 - 相对于角度移动阵列对象

Posted 2023-02-18

【中文标题】AS3 - 相对于角度移动阵列对象

【英文标题】：AS3 - Move Array objects relative to angle

【发布时间】：2018-05-14 17:30:37

【问题描述】：

我正在创建一个游戏，我需要将船只以设定的速度朝向它们所面对的角度移动。我已经使用此代码在游戏中的其他地方移动了奇异的船只，但我认为将它们放在一个数组中会很复杂。

任何帮助将不胜感激。

var ship1 = this.addChild(new Ship());
var ship2 = this.addChild(new Ship());
var ship3 = this.addChild(new Ship());
var ship4 = this.addChild(new Ship());

var shipSpeed1 = 10;

var shipArray: Array = [];

shipArray.push(ship1, ship2, ship3, ship4);

for (var i: int = 0; i < shipArray.length; i++)  
var randomX: Number = Math.random() * stage.stageHeight;
var randomY: Number = Math.random() * stage.stageHeight;

shipArray[i].x = randomX;
shipArray[i].y = randomY;

shipArray[i].rotation = 90;

shipArray[i].x += Math.sin(shipArray[i].rotation * (Math.PI / 180)) * shipSpeed1;
shipArray[i].y -= Math.cos(shipArray[i].rotation * (Math.PI / 180)) * shipSpeed1;

我也将它包含在同一个函数中，但我也无法让它工作。我又一次有了这个工作

if (shipArray[i].x < 0)  //This allows the boat to leave the scene and 
enter on the other side.
    shipArray[i].x = 750;

if (shipArray[i].x > 750) 
    shipArray[i].x = 0;

if (shipArray[i].y < 0) 
    shipArray[i].y = 600;

if (shipArray[i].y > 600) 
    shipArray[i].y = 0;

【问题讨论】：

显示你用来移动奇异飞船的代码。现在，您的代码不会在初始位置之外移动任何内容。

@BadFeelingAboutThis var ship = evt.currentTarget; ship.x += Math.sin(ship.rotation * (Math.PI / 180)) * randomSpeed(4, 15); //使用我的随机数控制船 ship.y -= Math.cos(ship.rotation * (Math.PI / 180)) * randomSpeed(4, 15);完全一样。

【参考方案1】：

首先，您需要将代码分成生成/初始化阶段和更新阶段。

类似于以下内容：

var shipArray: Array = [];

//spawn and set initial values (first phase)
//spawn 4 new ships
var i:int;
for(i=0;i<4;i++)
    //instantiate the new ship
    var ship:Ship = new Ship();
    //add it to the array
    shipArray.push(ship);

    //set it's initial x/y value
    ship.x = Math.random() * (stage.stageWidth - ship.width);
    ship.y = Math.random() * (stage.stageHeight - ship.height);

    //set it's initial rotation
    ship.rotation = Math.round(Math.random() * 360);

    //set the ships speed (dynamic property)
    ship.speed = 10;

    //add the new ship to the display
    addChild(ship);


//NEXT, add an enter frame listener that runs an update function every frame tick of the application
this.addEventListener(Event.ENTER_FRAME, gameUpdate);

function gameUpdate(e:Event):void 
    //loop through each ship in the array
    for (var i: int = 0; i < shipArray.length; i++)  
        //move it the direction it's rotated, the amount of it's speed property
        shipArray[i].x += Math.sin(shipArray[i].rotation * (Math.PI / 180)) * shipArray[i].speed;
        shipArray[i].y -= Math.cos(shipArray[i].rotation * (Math.PI / 180)) * shipArray[i].speed;
    

【讨论】：

新问题到底是什么？船只离开屏幕？