我对代码中的 Keys 事件和计时器有点陌生，但由于某种原因，存在这个奇怪的错误。（阅读最后的编辑）
public partial class Form1 : Form
{
bool start = false;
Snake ormen = new Snake(10);
short direction = 3;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
button1.Hide();
timer1.Enabled = true;
start = true;
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
Graphics g = e.Graphics;
if (start)
{
ormen.rita(g);
}
}
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Up:
direction = 3;
break;
case Keys.Down:
direction = 1;
break;
case Keys.Left:
direction = 2;
break;
case Keys.Right:
direction = 0;
break;
default:
break;
}
}
private void timer1_Tick(object sender, EventArgs e)
{
ormen.flytta(direction);
Invalidate();
}
}
}
我还尝试在关键事件中使用调试，但它甚至在该时间段之后才激活。谁能告诉我为什么？另外，如果有任何明显的错误，如果您能提及它们，我将不胜感激。我还尝试使计时器间隔更高，以检查程序是否跟不上但可以。（阅读最后的编辑）
[编辑] 我认为这不会有帮助，但这里是“Snake”类的代码。我怀疑那里有问题，但无论如何。
private short diameter = 0;
//0 = Right, 1 = Down, 2 = Left, 3 = Up
public Snake(short diameter)
{
this.diameter = diameter;
ormensPlatser.Enqueue(new Point(0, 0));
ormensPlatser.Enqueue(new Point(0 + diameter, 0));
ormensPlatser.Enqueue(new Point(0 + diameter + diameter, 0));
}
Queue<Point> ormensPlatser = new Queue<Point>();
public void rita(Graphics g)
{
Point temp;
for (int i = 0; i < ormensPlatser.Count; i++)
{
temp = ormensPlatser.Dequeue();
g.FillEllipse(new SolidBrush(Color.Red), temp.X, temp.Y, diameter, diameter);
ormensPlatser.Enqueue(temp);
}
}
private void ormNäraKant(short direction,ref Point ormBit)
{
switch (direction)
{
case 0:
ormBit.X = ormBit.X + diameter >= 380 ? 0 : ormBit.X + diameter;
break;
case 1:
ormBit.Y = ormBit.Y + diameter >= 360 ? 0 : ormBit.Y + diameter;
break;
case 2:
ormBit.X = ormBit.X - diameter < 0 ? 370 : ormBit.X - diameter;
break;
case 3:
ormBit.Y = ormBit.Y - diameter < 0 ? 350 : ormBit.Y - diameter;
break;
}
}
public void flytta(short direction)
{
Point temp;
int temp1 = ormensPlatser.Count - 1;
for (int i = 0; i < ormensPlatser.Count; i++)
{
if (i == temp1)
{
switch(direction)
{
case 0:
temp = ormensPlatser.Dequeue();
ormNäraKant(0, ref temp);
ormensPlatser.Enqueue(temp);
break;
case 1:
temp = ormensPlatser.Dequeue();
ormNäraKant(1, ref temp);
ormensPlatser.Enqueue(temp);
break;
case 2:
temp = ormensPlatser.Dequeue();
ormNäraKant(2, ref temp);
ormensPlatser.Enqueue(temp);
break;
case 3:
temp = ormensPlatser.Dequeue();
ormNäraKant(3, ref temp);
ormensPlatser.Enqueue(temp);
break;
}
}
else
{
ormensPlatser.Dequeue();
temp = ormensPlatser.Peek();
ormensPlatser.Enqueue(temp);
}
}
}
}
}
[EDIT2] 好吧，显然不是关于时间或类似的东西，代码有效，但我认为这与 slawekwin 在评论中所说的程序启动时的焦点有关。所以问题仍然是一样的，但是如果我 ALT+tab 到另一个程序然后回到蛇程序它就可以工作。