Question

我有一个程序，我想用键盘键移动一个Graphic。我最初有一个功能，只要按下一个按钮就可以移动图形，但我放弃了这种方法来绕过键盘重复延迟。相反，我决定使用一个计时器，我将在KeyPess事件上启用它，并禁用KeyUp事件。起初，我为每个不同的方向使用了4个不同的计时器，虽然它有效但我注意到我的程序已经开始经常冻结。我决定对所有动作使用单个计时器，并使用if语句来确定方向。现在，似乎我的Graphic根本没有移动，即使我所做的只是复制和粘贴代码。

enum Direction
{
    Left, Right, Up, Down
}
private Direction _objectDirection;
int _x = 100, _y = 100;
private void Form1_Paint(object sender, PaintEventArgs e)
{
Picture.MakeTransparent(Color.Transparent);
e.Graphics.DrawImage(Picture, _x, _y);
}
void Form1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.W)
    {
        if (timerAnimation.Enabled == false)
        {
            AnimationMaxFrame = 3;
            timerAnimation.Enabled = true;
        }
        _objectDirection = Direction.Up;
        timerMovement.Enabled = true;
    }
    //The rest of this code is omitted to save space, it is repeated 4 times with the only 
    //changes being the key pressed, and the object direction.
    Invalidate();
}
void Form1_KeyUp(object sender, KeyEventArgs e)
{
    timerAnimation.Enabled = false;
    timerMovement.Enabled = false;
    Picture = Idle;
    this.Refresh();
}
private void timerMovement_Tick(object sender, EventArgs e)
{
    if (_objectDirection == Direction.Up)
    {
        if (_y > 24)
        { _y = _y - 2; }
        else
        { timerMovement.Enabled = false; }
        //This if statement is to ensure that the object doesn't leave the form. 
        //I have tried removing them already, they're not the problem.
    }
    //Again, this is shortened to save space, it is repeated for each direction.
    Invalidate();
}

什么阻止我的图形移动，有没有更好的方法来做到这一点？我还想添加很多功能，但它已经冻结了。

Answer 1

不确定您是否正在使用WinForms制作游戏，但重点是......

您需要处理按键事件，当按下按键事件时，根据事件是按下还是释放，在代码中设置一个布尔标记。然后在更新代码中检查标记并相应地进行移动。

这将是这样的（示例代码）：

bool moveup = false;
void KeyPressed(object sender, KeyEventArgs e)
{
   // check for keys that trigger starting of movement
   if (e.KeyCode == Keys.W) moveup = true;
}
void KeyReleased(object sender, EventEventArgs e)
{
   // check for keys that trigger stopping of movement
   if (e.KeyCode == Keys.W) moveup = false;
}
void TimerTick(obect sender, EventArgs e)
{
   if (moveup)
   {
      // move your object
   }
}

为什么我的物体不动？

1 个答案: