Question

当我的角色掉到平台上时，我可以移动一切，一切正常。唯一的问题是当我跳跃时，它只允许它跳一次，然后在那之后不响应任何upKey事件。

我想知道如何解决我的代码问题。我希望每次按下向上箭头时我的角色都能跳跃。

继承我的代码：

package  {

import flash.display.MovieClip;
import flash.events.KeyboardEvent;
import flash.events.Event;
import flash.ui.Keyboard;


public class GameCode extends MovieClip {

    var upKey:Boolean;
    var leftKey:Boolean;
    var rightKey:Boolean;
    var jump:Boolean = false;

    var xvelocity:int = 10;
    var yvelocity:int = 0;
    var gravity:Number = 1;
    var jumpspeed:int = -10;
    var onPlatform:Boolean;

    var startPosY:int;
    var startPosX:int;
    var lastPosY:int;
    var lastPosX:int;

    public function GameCode() {
        // constructor code
    }

    public function startGame(){
        stage.addEventListener(KeyboardEvent.KEY_UP, checkKeyUp);
        stage.addEventListener(KeyboardEvent.KEY_DOWN, checkKeyDown);
        stage.addEventListener(Event.ENTER_FRAME, update);
    }

    function update(evt:Event){
        moveCharacter();
        yvelocity += gravity;

        if (!platform.hitTestObject(player)){
                player.y += yvelocity;
                onPlatform = false;
        }

        for (var i:int = 0; i < 10; i++){
            if (platform.hitTestPoint(player.x, player.y, true)){
                yvelocity = 0;
                player.y = platform.y - 1;
                onPlatform = true;
            }
        }
    }

    function moveCharacter(){
        lastPosY = player.y;
        lastPosX = player.x;

        if (leftKey == true){
            player.x -= xvelocity;
        }
        if (rightKey == true){
            player.x += xvelocity;
        }
        if (upKey == true && onPlatform == true){
            yvelocity = jumpspeed;
            player.y += yvelocity;
        }
    }

    function checkKeyDown(evt:KeyboardEvent){
        if (evt.keyCode == Keyboard.LEFT){
            leftKey = true;
        }
        else if (evt.keyCode == Keyboard.RIGHT){
            rightKey = true;
        }
        else if (evt.keyCode == Keyboard.UP){
            upKey = true;
        }
    }

    function checkKeyUp(evt:KeyboardEvent){
        if (evt.keyCode == Keyboard.LEFT){
            leftKey = false;
        }
        else if (evt.keyCode == Keyboard.RIGHT){
            rightKey = false;
        }
        else if (evt.keyCode == Keyboard.UP){
            upKey = false;
        }
    }
}

}

Answer 1

我用一些痕迹运行你的代码。当你跳跃和降落时，onPlatform继续解决为假。这是因为，当您循环遍历i的10次迭代时，您根本不在循环中使用i。通过将玩家定位在平台上方1个像素，并且因为您只检查玩家的碰撞精确坐标，该循环将永远不会检测到命中。改变......

if (platform.hitTestPoint(player.x, player.y, true)){

为...

if (platform.hitTestPoint(player.x, player.y + i, true)){

Answer 2

不确定礼仪是什么 - 我基本上只是想让OP知道我弄清楚了他的问题。我认为另一个答案可能会记录在他的活动'饲料'上。所以...

当你跳跃和降落时，onPlatform继续解决为假。这是因为，当你遍历10次'i'迭代时，你根本不在循环中使用'i'。通过将玩家定位在平台上方1个像素，并且因为您只检查玩家的碰撞精确坐标，该循环将永远不会检测到命中。改变......

if (platform.hitTestPoint(player.x, player.y, true)){

为...

if (platform.hitTestPoint(player.x, player.y + i, true)){

......它有效。

角色只在平台上跳一次：AS3

2 个答案: