.net 下操作鼠标滚轮的事件 以及换算方法

Code

public partial class Form1 : Form

{

Bitmap memBitmap;

float currRotation = 10;

Rectangle rect = new Rectangle(100, 50, 150, 100);

public Form1()

{

InitializeComponent();

memBitmap = new Bitmap(this.Width, this.Height);

using (Graphics g = Graphics.FromImage(memBitmap))

{

g.DrawRectangle(Pens.Blue, rect);

}

}

protected override void OnMouseWheel(MouseEventArgs e)

{

currRotation -= 5.0f * e.Delta / SystemInformation.MouseWheelScrollDelta; // 5 degree, you can make it 45

}