Question

对于一个学校项目，我需要制作一个多个椭圆移动的小游戏。用我的方法同时制作多个的最后一个用我制作的计时器移动。

如何为所有省略号制作一个计时器。

class EnemyTeam
{

    private Ellipse enemy;
    private Canvas canvas;
    private double xChange = 50, yChange = 50;
    public DispatcherTimer enemyTimer;
    private char direction = '0';
    private Thickness enemyThickness;

    public EnemyTeam(Canvas canvas, double startPosition, SolidColorBrush playerBrush)
    {
        this.canvas = canvas;
        DrawTeam(canvas, 40, playerBrush);
        enemyTimer.Interval = TimeSpan.FromMilliseconds(100);
        enemyTimer.Start();
    }

    private void DrawBall(SolidColorBrush brush, Canvas canvas,double x,double y)
    {
        enemy = new Ellipse();
        enemy.Stroke = brush;
        enemy.Fill = brush;
        enemy.Height = 30;
        enemy.Width = 30;
        enemy.Margin = new Thickness(x,y, 0, 0);
        enemyTimer = new DispatcherTimer();
        enemyThickness = enemy.Margin;
        canvas.Children.Add(enemy);   
        enemyTimer.Tick += enemyTimer_Tick;
    }

    void enemyTimer_Tick(object sender, EventArgs e)
    {
        if (enemyThickness.Left >= canvas.Width - 100)
        {
            GoDown();
            direction = '1';
        }

        if (enemyThickness.Left <= 0 + 20)
        {
            GoDown();
            direction = '0';
        }
        MoveTeam(enemy);
    }

    private void MoveTeam(Ellipse enemy)
    {
        enemyThickness = enemy.Margin;

        if (direction == '1')
        {
            enemyThickness.Left -= xChange;
        }

        if (direction == '0')
        {
            enemyThickness.Left += xChange;
        }

        enemy.Margin = enemyThickness;
    }

    private void GoDown()
    {
        enemyThickness.Top += yChange;
        enemy.Margin = enemyThickness;
    }
}

Answer 1

将enemyTimer声明为静态字段：

class EnemyTeam
{
    private static enemyTimer = new DispatcherTimer();
...

关键字static将使该字段共享该字段。

Answer 2

不是在DrawBall方法中初始化和分配事件处理程序，而是在EnemyTeam类的构造函数中执行此操作。这将为每个EnemyTeam对象提供计时器。

Answer 3

你正在制作多个计时器并扔掉它们。见这一行：

enemyTimer = new DispatcherTimer();

每当你打电话给你时，你都会制作一个新的计时器并丢弃enemyTimer持有引用的先前副本。因为在enemyTimer.Start()之后调用DrawTeam，所以只在最后创建的计时器上调用它。没有其他计时器开始。

但即使其他计时器开始，你仍然只能看到一个椭圆移动，因为在enemyTimer_Tick中你只能对enemy进行更改，这是一个类成员变量，指向最后创建的椭圆。

我建议您只使用一个计时器，将您在列表中创建的所有省略保存在以后使用，并在enemyTimer_Tick中通过迭代列表来更新所有这些省略号。

编辑：这是您的代码的副本，重新设计一下，向您展示我的意思。我真的不明白你要对MoveTeam和敌人的变量做什么，所以我并没有把这些东西搞得一团糟。也就是说，这不是一个完整的工作解决方案，只是我所建议的变化的一个例子。

using System.Collections.Generic;

class EnemyTeam
{

    private List<Ellipse> enemies = new List<Ellipse>();
    private Canvas canvas;
    private double xChange = 50, yChange = 50;
    public DispatcherTimer enemyTimer;
    private char direction = '0';
    private Thickness enemyThickness;

    public EnemyTeam(Canvas canvas, double startPosition, SolidColorBrush playerBrush)
    {
        this.canvas = canvas;
        DrawTeam(canvas, 40, playerBrush);
        enemyTimer = new DispatcherTimer();
        enemyTimer.Interval = TimeSpan.FromMilliseconds(100);
        enemyTimer.Tick += enemyTimer_Tick;
        enemyTimer.Start();
    }

    private void DrawBall(SolidColorBrush brush, Canvas canvas,double x,double y)
    {
        enemy = new Ellipse();
        enemy.Stroke = brush;
        enemy.Fill = brush;
        enemy.Height = 30;
        enemy.Width = 30;
        enemy.Margin = new Thickness(x,y, 0, 0);
        enemyThickness = enemy.Margin; // what is this supposed to do?
        canvas.Children.Add(enemy);
        enemies.Add(enemy);
    }

    void enemyTimer_Tick(object sender, EventArgs e)
    {
        foreach (Ellipse enemy in enemies)
        {
            if (enemyThickness.Left >= canvas.Width - 100)
            {
                GoDown();
                direction = '1';
            }

            if (enemyThickness.Left <= 0 + 20)
            {
                GoDown();
                direction = '0';
            }
            MoveTeam(enemy);
        }
    }

    private void MoveTeam(Ellipse enemy)
    {
        enemyThickness = enemy.Margin;

        if (direction == '1')
        {
            enemyThickness.Left -= xChange;
        }

        if (direction == '0')
        {
            enemyThickness.Left += xChange;
        }

        enemy.Margin = enemyThickness;
    }

    private void GoDown()
    {
        enemyThickness.Top += yChange;
        enemy.Margin = enemyThickness;
    }
}

C＃一个多个形状的计时器

3 个答案: