AS3性格跳跃​​/下降的问题 [英] AS3 Character jumping/falling problems

问题描述

我有问题，让人物跳跃/失败时，向上箭头为pressed。我想使它所以当向上箭头键pressed一旦它会跳到一定高度后下降。

下面是我的运动code：

 公共变种比重：INT = 2;



公共职能fireboyMo​​vement（E：的KeyboardEvent）：无效
    {
        如果（e.key code == 37）//权
        {
            fireboy1.x = fireboy1.x -5;
            checkBorder（）

        }
        否则，如果（e.key code == 39）//离开
        {
            fireboy1.x = fireboy1.x +5;
            checkBorder（）

        }
        如果（e.key code == 38）//起来
        {
            fireboy1.y = fireboy1.y -20;
            fireboy1.y + =重力;
            checkBorder（）
        }
 

解决方案

您的问题是，你需要增加球员的位置随时间（而不是一次）。

您可以使用一个补间动画引擎（如TweenLite的），或推出自己的定时器或输入帧处理。

下面是后者的一个示例：

 如果（e.key code == 38）//起来
    {
        如果（！isJumping）{
            isJumping = TRUE;
            速度= 50; //多少移动每个增量，重置每跳为默认值
            方向= -1; //通过去向上启动
            this.addEventListener（Event.ENTER_FRAME，jumpLoop）;
        }
    }
 

---

  VAR isJumping：布尔=假;
VAR摩擦：数= 0.85; //如何快速减速/加速 - 数字越低，就越快（必须小于1，和大于0至正常工作）
变种速度：数;
VAR方向：= -1;

功能jumpLoop（）{//这是每一个运行的框架，同时跳
    fireboy1.y + =速度*方向; //取当前速度，并把它应用在当前方向
    如果（方向℃，）{
        速度* =摩擦; //降低速度的球员上升
    }其他{
        速度* = 1 +（1  - 摩擦）; //增长速度，现在球员正在下降
    }

    如果（速度＆小于1）方向= 1; //如果玩家现在正小于1个像素，改变方向
    如果（fireboy1.y＆GT; stage.stageHeight  -  fireboy1.height）{//stage.stageheight是无论你的地板
        fireboy1.y = stage.stageHeight  -  fireboy1.height; //把球员在场上完全
        //跳结束后，停止jumpLoop
        this.removeEventListener（Event.ENTER_FRAME，jumpLoop）;
        isJumping = FALSE;
    }
}
 

I am having problems with getting the character to jump/fail when the up arrow is pressed. I'm trying to make it so when the up arrow key is pressed once it will jump a certain height then fall.

Here is my movement code:

public var gravity:int = 2;



public function fireboyMovement(e:KeyboardEvent):void
    {
        if (e.keyCode == 37) //right
        {
            fireboy1.x = fireboy1.x -5;
            checkBorder()

        }
        else if (e.keyCode == 39) //left
        {
            fireboy1.x = fireboy1.x +5;
            checkBorder()

        }
        if (e.keyCode == 38) //up
        {
            fireboy1.y = fireboy1.y -20;
            fireboy1.y += gravity;
            checkBorder()
        }

解决方案

Your issue is you need to increment the players position over time (and not all at once).

You can either use a tweening engine (like tweenlite), or roll your own timer or enter frame handler.

Here is an example of the latter:

    if (e.keyCode == 38) //up
    {
        if(!isJumping){
            isJumping = true;
            velocity = 50;  //how much to move every increment, reset every jump to default value
            direction = -1; //start by going upwards
            this.addEventListener(Event.ENTER_FRAME,jumpLoop);
        }
    }

---

var isJumping:Boolean = false;
var friction:Number = .85; //how fast to slow down / speed up - the lower the number the quicker (must be less than 1, and more than 0 to work properly)
var velocity:Number;
var direction:int = -1;

function jumpLoop(){ //this is running every frame while jumping 
    fireboy1.y += velocity * direction; //take the current velocity, and apply it in the current direction
    if(direction < 0){
        velocity *= friction; //reduce velocity as player ascends
    }else{
        velocity *= 1 + (1 - friction); //increase velocity now that player is falling
    }

    if(velocity < 1) direction = 1; //if player is moving less than 1 pixel now, change direction
    if(fireboy1.y > stage.stageHeight - fireboy1.height){  //stage.stageheight being wherever your floor is
        fireboy1.y = stage.stageHeight - fireboy1.height; //put player on the floor exactly
        //jump is over, stop the jumpLoop
        this.removeEventListener(Event.ENTER_FRAME,jumpLoop);
        isJumping = false;
    }
}

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