Question

我正在尝试创造一种太空飞船游戏，用箭头键控制图像（显然是太空飞船），向上/向下/向下移动。为此我使用了CoreWindow.KeyDown事件。

它实际上工作正常，但运动不够平稳。每次按下其中一个箭头键，图像就会出现： 1.向该方向移动一步 2.冻结，半秒钟（甚至更少）然后继续前进，没有任何问题。（A＆＃34;步骤＆＃34;，是一个＆＃39; int＆＃39;变量，它包含多个像素，比如20）。

当然，这无法运行游戏。当我按下其中一个箭头键而没有＆＃34;半秒钟时，我想让船立即顺利移动。延迟。这是我的代码：

public sealed partial class MainPage : Page
{
    double playerYAxisPosition;
    double playerXAxisPosition;
    int steps = 20;
    bool upMovement;
    bool downMovement;
    bool rightMovement;
    bool leftMovement;

    public MainPage()
    {
        this.InitializeComponent();
        Window.Current.CoreWindow.KeyDown += CoreWindow_KeyDown;
        Window.Current.CoreWindow.KeyUp += CoreWindow_KeyUp;
    }

    // Recognizes the KeyDown press and sets the relevant booleans to "true"
    private void CoreWindow_KeyDown(Windows.UI.Core.CoreWindow sender, Windows.UI.Core.KeyEventArgs args) {
        playerYPosition = (double) playerShip.GetValue(Canvas.TopProperty);
        playerXPosition = (double) playerShip.GetValue(Canvas.LeftProperty);

        if (args.VirtualKey == Windows.System.VirtualKey.Up) {
            upMovement = true;
        }
        else if (args.VirtualKey == Windows.System.VirtualKey.Down) {
            downMovement = true;
        }
        else if (args.VirtualKey == Windows.System.VirtualKey.Left) {
            leftMovement = true;
        }
        else if (args.VirtualKey == Windows.System.VirtualKey.Right) {
            rightMovement = true;
        }
        movePlayer();
    }

    // recognizes the KeyUp event and sets the relevant booleans to "false"
    private void CoreWindow_KeyUp(Windows.UI.Core.CoreWindow sender, Windows.UI.Core.KeyEventArgs args) {
        if (args.VirtualKey == Windows.System.VirtualKey.Up) {
            upMovement = false;
        }
        else if (args.VirtualKey == Windows.System.VirtualKey.Down) {
            downMovement = false;
        }
        else if (args.VirtualKey == Windows.System.VirtualKey.Left) {
            leftMovement = false;
        }
        else if (args.VirtualKey == Windows.System.VirtualKey.Right) {
            rightMovement = false;
        }
    }

    // Calls the movement Methods of the relevant direction
    private void movePlayer() {
        if (upMovement) {
            moveUp();
        }
        if (downMovement) {
            moveDown();
        }
        if (rightMovement) {
            moveRight();
        }
        if (leftMovement) {
            moveLeft();
        }
    }

    private void moveUp() {
        playerShip.SetValue(Canvas.TopProperty, playerYPosition - stepsToMove);
    }

    private void moveDown() {
        playerShip.SetValue(Canvas.TopProperty, playerYPosition + stepsToMove);
    }

    private void moveRight() {
        playerShip.SetValue(Canvas.LeftProperty, playerXPosition + stepsToMove);
    }

    private void moveLeft() {
        playerShip.SetValue(Canvas.LeftProperty, playerXPosition - stepsToMove);
    }

顺便说一句，我创造了一些专门的布尔值的原因，这些布尔将被设置为“真正的”＃39;或者＆＃39; false＆＃39;在每个KeyDown事件上，并没有直接使用KeyDown事件，是因为该分离允许元素（船舶图像）也对角移动，同时使用＆＃34; args.VirtualKey == Windows.System.VirtualKey.SomeArrowKey＆＃34;从某种原因直接不允许它。

感谢您的帮助。

Answer 1

如果您想创建游戏，则应在游戏循环中移动playerShip。您可以使用DispatcherTimer或注册CompositionTarget.Rendering事件来创建游戏循环。

Windows.UI.Xaml.Media.CompositionTarget.Rendering += CompositionTarget_Rendering;

更改CoreWindow_KeyDown事件处理程序，如下所示：

private void CoreWindow_KeyDown(Windows.UI.Core.CoreWindow sender, Windows.UI.Core.KeyEventArgs args)
{
    if (args.VirtualKey == Windows.System.VirtualKey.Up)
    {
        upMovement = true;
    }
    else if (args.VirtualKey == Windows.System.VirtualKey.Down)
    {
        downMovement = true;
    }
    else if (args.VirtualKey == Windows.System.VirtualKey.Left)
    {
        leftMovement = true;
    }
    else if (args.VirtualKey == Windows.System.VirtualKey.Right)
    {
        rightMovement = true;
    }
}

接下来，在CompositionTarget.Rendering事件处理程序中移动您的船只。

private void CompositionTarget_Rendering(object sender, object e)
{
    playerYPosition = (double)playerShip.GetValue(Canvas.TopProperty);
    playerXPosition = (double)playerShip.GetValue(Canvas.LeftProperty);
    movePlayer();
}

使用KeyDown事件UWP在画布上平滑元素运动

1 个答案: