我已经开始学习一些Microsoft.DirectX 3D基本技术，并且碰到了这个对我来说太难的问题。我已经创建了3D场景，相机，灯光等，并绘制了一些简单的3D对象。我现在要做的是围绕所有三个轴简单地旋转对象。为此我想使用Arrow和ASWD键盘键，就像在计算机游戏中一样。为此，我使用了OnKeyDown和OnKeyUp事件处理程序：
#region - Event handler -
protected override void OnKeyDown(KeyEventArgs e)
{
base.OnKeyDown(e);
#region - speed -
if(e.KeyValue == (char)Keys.Add || e.KeyValue == (char)Keys.Oemplus)
step_p = true;
if(e.KeyValue == (char)Keys.Subtract || e.KeyValue == (char)Keys.OemMinus)
step_m = true;
if(step_p)
step++;
if(step_m)
step--;
if(step==0)
step = 1;
#endregion
#region - rotation -
if(e.KeyCode == Keys.Left)
{
left = true;
}
if(e.KeyCode == Keys.Right)
{
right = true;
}
if(e.KeyCode == Keys.Up)
{
up = true;
}
if(e.KeyCode == Keys.Down)
{
down = true;
}
if(e.KeyCode == Keys.A)
{
a = true;
}
if(e.KeyCode == Keys.D)
{
d = true;
}
if(left)
angleZ_D+=step;
if(right)
angleZ_D-=step;
if(up)
angleX_D-=step;
if(down)
angleX_D+=step;
if(a)
angleY_D+=step;
if(d)
angleY_D-=step;
//
//
//
if(angleX_D == 360)
angleX_D = 0;
if(angleY_D >= 360)
angleY_D = 0;
if(angleZ_D >= 360)
angleZ_D = 0;
angleX_R = angleX_D * rad;
angleY_R = angleY_D * rad;
angleZ_R = angleZ_D * rad;
//
//
//
#endregion
#region - zoom -
if(e.KeyValue == (char)Keys.W)
{
w = true;
}
if(e.KeyValue == (char)Keys.S)
{
s = true;
}
if(w)
{
zoom+=0.1f * step;
if(zoom>10.0f) zoom=10.0f;
}
if(s)
{
zoom-=0.1f * step;
if(zoom<1.0f) zoom=1.0f;
}
#endregion
Draw();
}
protected override void OnKeyUp(KeyEventArgs e)
{
base.OnKeyUp(e);
#region - speed -
if(e.KeyValue == (char)Keys.Add || e.KeyValue == (char)Keys.Oemplus)
step_p = false;
if(e.KeyValue == (char)Keys.Subtract || e.KeyValue == (char)Keys.OemMinus)
step_m = false;
#endregion
#region - rotation -
if(e.KeyCode == Keys.Left)
{
left = false;
}
if(e.KeyCode == Keys.Right)
{
right = false;
}
if(e.KeyCode == Keys.Up)
{
up = false;
}
if(e.KeyCode == Keys.Down)
{
down = false;
}
if(e.KeyCode == Keys.A)
{
a = false;
}
if(e.KeyCode == Keys.D)
{
d = false;
}
#endregion
#region - zoom -
if(e.KeyValue == (char)Keys.W)
{
w = false;
}
if(e.KeyValue == (char)Keys.S)
{
s = false;
}
#endregion
Draw();
}
这就是问题所在：
当我按下 A 键并按住它时我按下键 W ，程序运行正常但是当我释放键 W 时处理程序无法识别仍然按下 A 键。
C＃4.0和.Net framework 2.0中是否存在解决此问题的方法
一切顺利， ŽeljkoPerić
根据
引用： 您按照键盘按下时重复按键。 按下另一个键后，它就会停止工作。 您需要使用Timer并在Tick事件处理程序中 检查你想要移动的方式。现在关键重复不再重要。 将计时器的Interval属性设置为15或31以获得良好的一致性。 - Hans Passant
这是问题解决方案：
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 miliseconds
//
// 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 AWSD keys
//
int W = 0;
int A = 0;
int S = 0;
int D = 0;
//
// Variables ( flags ) for memorizing
// the key down state of AWSD 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 miliseconds
//
// 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 smaler 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 wich key is pressed
// upon key down flag value and updates correspondig 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(a)
A++;
if(s)
S++;
if(w)
W++;
if(d)
D++;
//
// Show values of counters
//
Label_A.Text = "A = " + A.ToString();
Label_S.Text = "S = " + S.ToString();
Label_W.Text = "W = " + W.ToString();
Label_D.Text = "D = " + D.ToString();
}
}
}