Flash Actionscript 3.0 游戏弹丸创建

Question

-------- 最初的问题已修复，但我有一个新问题 - 请参见下文 ---------- ----

在我的横向卷轴游戏中，我尝试制作玩家射击的吹镖。当然，我希望飞镖从玩家所在的位置开始，然后飞镖朝他们的方向移动。

但是，我有一个问题。在我的游戏中，我使用了一个滚动功能，将玩家放在屏幕中间。这是那个函数：

        // This function scrolls the MovieClip Containers on the screen
    private function scrollScreen(event:Event):void {

        // Here we offset the elements' 'x' and 'y' coordinates by 
        // the distance between the Player and the centre of the stage
            // Environment Container
            envContainer.x += (stage.stageWidth * 0.5) - player.x;
            // Background Container
                // Background moves more slowly along the 'x' axis to simulate distance
            bgContainer.x += ((stage.stageWidth * 0.5) - player.x) * 1/20;
            // Position the Player at the centre of the game screen ('x' axis)
            player.x = stage.stageWidth * 0.5;

        // Here we offset the elements' 'y' coordinates
            // Environment Container
            envContainer.y += (stage.stageHeight * 0.5) - player.y;
            // Background Container
            bgContainer.y += (stage.stageHeight * 0.5) - player.y;
            // Position the Player at the centre of the game screen ('y' axis)
            player.y = stage.stageHeight * 0.5;             
   } // End of 'scrollScreen()' function    

据我所知，“envContainer”和“bgContainer”上的滚动与我正在谈论的问题无关。我只关心玩家的定位。

下面是我用来创建飞镖的函数：

    // This function creates a dart
    private function createDart():void {

        if (playerDartContainer.numChildren <= 4) {

            trace("DART!");

            playerDart = new PlayerDart();

            playerDart.x = player.x;
            playerDart.y = player.y;

            trace("PD x: " + playerDart.x);
            trace("Player x: " + player.x);
            trace("PD y: " + playerDart.y);
            trace("Player y: " + player.y);

            // Set the new dart's direction to equal that of the player
            // Player's facing right
            if (player.scaleX == 1) {
                // So dart faces right, too
                playerDart.scaleX = 1;
            } 
            // Player's facing left
            else if (player.scaleX == -1) {
                // So dart faces left, too
                playerDart.scaleX = -1;
            }

            playerDartContainer.addChild(playerDart);

            trace("Num children: " + playerDartContainer.numChildren);
        }
    }

发生的情况是飞镖总是添加到舞台的点 (350, 350) - 玩家放置的确切点（相对于屏幕，即 700*700）。所以我知道问题与程序认为 Player 和 Dart 对象应该是的坐标有关。我只是不知道如何解决这个问题。我看过 'globalToLocal()' 方法，但我对如何在这种情况下使用它感到困惑。

如何在相对于播放器的正确位置创建飞镖？

如果有任何帮助，我将不胜感激。谢谢！

------------------------------------------ 编辑和更新--------------------------

编辑和更新：我在正确的位置（靠近玩家——见下面的 cmets）创建了飞镖，并使用“movePlayerDarts()”函数移动它们。但我实际上有一个新问题。当玩家发射飞镖后移动时，飞镖会跟随他！如果玩家跳跃，飞镖就会升起。如果玩家向左移动，飞镖会稍微向左移动。

显然，某处有一些代码告诉飞镖跟随玩家。我不明白如何，除非“playerDartContainer”与此有关。但是容器始终在位置 (0,0) 并且它不会移动。

此外，作为测试，我在不断运行的“movePlayerDarts()”函数中追踪了飞镖的“y”坐​​标。如您所见，该函数通过增加 y 坐标值不断将 dart 沿 y 轴移动。但是当我跳跃时，被追踪的 'y' 坐标永远不会减少，即使飞镖看起来像是在上升！

如果有人有任何建议，我将不胜感激！

这是我用来创建飞镖的代码：

        // This function creates a dart
    public function createDart():void {

        if (playerDartContainer.numChildren <= 4) {
            // Play dart shooting sound
            sndDartShootIns.play();

            // Create a new 'PlayerDart' object
            playerDart = new PlayerDart();

            // Set the new dart's initial position and direction depending on the player's direction
            // Player's facing right
            if (player.scaleX == 1) {
                // Create dart in front of player's dart gun
                playerDart.x = player.x + 12;
                playerDart.y = player.y - 85;
                // Dart faces right, too
                playerDart.scaleX = 1;
            } 
            // Player's facing left
            else if (player.scaleX == -1) {
                // Create dart in front of player's dart gun
                playerDart.x = player.x - 12;
                playerDart.y = player.y - 85;
                // Dart faces left, too
                playerDart.scaleX = -1;
            }
            playerDartContainer.addChild(playerDart);
        }
    } // End of 'createDart()' function

此代码是玩家飞镖的 EnterFrameHandler：

        // In every frame, call 'movePlayerDarts()' to move the darts within the 'playerDartContainer'
    public function playerDartEnterFrameHandler(event:Event):void {
        // Only move the Player's darts if their container has at least one dart within
        if (playerDartContainer.numChildren > 0) {
            movePlayerDarts();
        }
    }                       

最后，这是实际移动所有玩家飞镖的代码：

            // Move all of the Player's darts
    public function movePlayerDarts():void {
            for (var pdIns:int = 0; pdIns < playerDartContainer.numChildren; pdIns++) {
                // Set the Player Dart 'instance' variable to equal the current PlayerDart
                playerDartIns = PlayerDart(playerDartContainer.getChildAt(pdIns));

                // Move the current dart in the direction it was shot. The dart's 'x-scale' 
                    // factor is multiplied by its speed (5) to move the dart in its correct
                    // direction. If the 'x-scale' factor is -1, the dart is pointing left (as
                    // seen in the 'createDart()' function. (-1 * 5 = -5), so the dart will go
                    // to left at a rate of 5. The opposite is true for the right-ward facing
                    // darts
                playerDartIns.x += playerDartIns.scaleX * 1;

                // Make gravity work on the dart
                playerDartIns.y += 0.7;
                //playerDartIns.y += 1;

                // What if the dart hits the ground?
                if (HitTest.intersects(playerDartIns, floor, this)) {
                    playerDartContainer.removeChild(playerDartIns);
                }

                //trace("Dart x: " + playerDartIns.x);
                trace("Dart y: " + playerDartIns.y);
            }
    }

Answer 1

playerDartContainer 应该与您的 player 实例在同一级别实例化。如果它没有更新它相对于玩家的位置，那么实例化并添加到它的飞镖就会出现在它所在的任何位置。

第一个解决方案是设置playerDartContainer的位置为playerDartContainer.x = player.x和playerDartContainer.y = player.y无论您在哪里更新您的玩家位置。将飞镖的实例更改为显示在 0,0。

第二种解决方案是将位置设置为 0,0（始终是屏幕的左上角），并且 playerDart 的偏移量与 playerDartContainer 中的玩家位置相同。由于您的玩家从不真正移动，因此 playerDartContainer 也不应该真正移动，因此您的飞镖将出现在与玩家相同的相对空间中。