如何在 C# 中处理和使用同时按下两个或多个键的事件 - WASD 键盘游戏控制 -

引言

引用

您依赖于键盘在按住某个键时重复该键。

一旦您按下另一个键，它就会停止工作。

您需要改用 Timer，并在 Tick 事件处理程序中

检查您想要移动的方向。现在，按键重复不再重要。

将 timer 的 Interval 属性设置为 15 或 31 以获得良好的一致性。

                                                       – Hans Passant

 

下载开源代码 - 39.6 KB

 

技巧与窍门

使用代码

下载开源代码 - 39.6 KB

using System;
using System.Windows.Forms;

namespace WASD_keyboard_game_control
{
    public partial class MainForm : Form
    {

        //
        // Global variables declaration
        //

        //
        // Timer
        //
        // Implements a timer that
        // raises event at user defined interval
        //
        Timer Clock;

        //
        // Set Timer tick Interval in milliseconds
        //
        // By changing value of Interval,
        // we control how often the timer tick event handler is raised
        // and eventually the call frequency of Main_Function()
        //
        const int Interval = 15;

        //
        // Variables for counting the number
        // of times that program has confirmed
        // the key down state of WASD keys
        //
        int W = 0;
        int A = 0;
        int S = 0;
        int D = 0;

        //
        // Variables ( flags ) for memorizing
        // the key down state of WASD keys
        //
        // true  - key is down ( pressed )
        //
        // false - key is up ( released )
        //
        //
        bool w = false;
        bool a = false;
        bool s = false;
        bool d = false;

        //
        //
        //

        public MainForm()
        {
            //
            // The InitializeComponent() call is required
            // for Windows Forms designer support.
            //
            InitializeComponent();

            //
            // Call Initialize_Timer() function
            //
            Initialize_Timer();
        }
       

        void Initialize_Timer()
        {
            // Create new timer
            Clock = new Timer();

            // Set timer tick interval in milliseconds
            //
            // By changing value of interval,
            // we control how often the timer tick event handler is raised
            // and eventually the call frequency of Main_Function()
            //
            Clock.Interval = Interval;

            //
            // Add timer tick event handler
            //
            // This event handler is raised
            // every time timer make tick
            //
            // The smaller value for timer interval,
            // more often the event handler is raised
            //
            Clock.Tick += new System.EventHandler(this.ClockTick);

            //
            // Start timer
            //
            Clock.Start();
        }
       

        void ClockTick(object sender, EventArgs e)
        {
            //
            // Timer tick event handler
            //

            //
            // Call Main_Function()
            //
            Main_Function();

            //
            //
            //
        }

        protected override void OnKeyDown(KeyEventArgs e)
        {
            //
            // This event handler is raised every time
            // some key on the keyboard is first pressed
            //

            base.OnKeyDown(e);

            //
            // Set corresponding key down flag state to true
            //

            if(e.KeyCode == Keys.W)
                w = true;
            if(e.KeyCode == Keys.A)
                a = true;
            if(e.KeyCode == Keys.S)
                s = true;
            if(e.KeyCode == Keys.D)
                d = true;
        }
       

        protected override void OnKeyUp(KeyEventArgs e)
        {
            //
            // This event handler is raised every time
            // some key on the keyboard is released
            //

            base.OnKeyUp(e);

            //
            // Set corresponding key down flag state to false
            //

            if(e.KeyCode == Keys.W)
                w = false;
            if(e.KeyCode == Keys.A)
                a = false;
            if(e.KeyCode == Keys.S)
                s = false;
            if(e.KeyCode == Keys.D)
                d = false;
        }
       

        void Main_Function()
        {
            //
            // Main function
            //

            //
            // This function is called every time the
            // timer tick event handler is raised
            //

            //
            // This function determines which key is pressed
            // upon key down flag value and updates corresponding counter value
            //
            // Counter value shows how many times program has confirmed the
            // key down state and not how many times user has pressed the key
            //
           

            //
            // Increase counter value if key is down
            //

            if(w)
                W++;
            if(a)
                A++;
            if(s)
                S++;          
            if(d)
                D++;

            //
            // Show values of counters
            //

            Label_W.Text = "W = " + W.ToString();
            Label_A.Text = "A = " + A.ToString();
            Label_S.Text = "S = " + S.ToString();
            Label_D.Text = "D = " + D.ToString();
        }
    }
}

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最后更新 2016 年 10 月 22 日，作者