能给我一个在VS2010新建的控件类中绘制一个全向虚拟摇杆的示例代码吗
时间: 2023-02-24 16:36:21 浏览: 63
当然,以下是一个在VS2010中新建的控件类绘制全向虚拟摇杆的示例代码:
```
using System;
using System.Drawing;
using System.Windows.Forms;
namespace JoystickExample
{
public class JoystickControl : Control
{
private Point centerPoint;
private Point joystickPoint;
private int radius;
public JoystickControl()
{
SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.DoubleBuffer, true);
centerPoint = new Point(this.Width / 2, this.Height / 2);
radius = Math.Min(this.Width, this.Height) / 3;
joystickPoint = centerPoint;
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
e.Graphics.FillEllipse(Brushes.Gray, centerPoint.X - radius, centerPoint.Y - radius, 2 * radius, 2 * radius);
e.Graphics.FillEllipse(Brushes.Red, joystickPoint.X - radius / 2, joystickPoint.Y - radius / 2, radius, radius);
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (e.Button == MouseButtons.Left)
{
int x = e.X - centerPoint.X;
int y = e.Y - centerPoint.Y;
int distance = (int)Math.Sqrt(x * x + y * y);
if (distance <= radius)
{
joystickPoint = e.Location;
}
else
{
joystickPoint = new Point(centerPoint.X + x * radius / distance, centerPoint.Y + y * radius / distance);
}
Invalidate();
}
}
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
if (e.Button == MouseButtons.Left)
{
joystickPoint = e.Location;
Invalidate();
}
}
protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
if (e.Button == MouseButtons.Left)
{
joystickPoint = centerPoint;
Invalidate();
}
}
}
}
```
这个代码示例在VS2010中新建一个控件类,重写了`OnPaint`、`OnMouseMove`、`OnMouseDown`、`OnMouseUp`四个方法,实现了一个全向虚拟摇杆的绘制。