c# winform 如何让一个固定的图片按比例放大或缩小

Answer 1

是随鼠标的还是你点击后扩大到一定的比例大小
//窗体构造中
this.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseWheel);

#region 进入窗体时加载

public FormAlarmInfoQuery()
{
InitializeComponent();
pictureBox1.ImageLocation = "f:\\1.jpg";

this.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseWheel);
//判断是否已安装带滚轮的鼠标
//SystemInformation.MouseWheelPresent.ToString();
//获取鼠标滚轮在滚动时所获得的行数
//SystemInformation.MouseWheelScrollLines.ToString();
//判断该操作系统是否支持滚轮鼠标
//SystemInformation.NativeMouseWheelSupport.ToString();
}

#endregion
//鼠标事件
private void panel1_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
{
MessageBox.Show("滚动事件已被捕捉");
System.Drawing.Size t = pictureBox1.Size;
t.Width += e.Delta;
t.Height += e.Delta;
pictureBox1.Width = t.Width;
pictureBox1.Height = t.Height;
}

这是按鼠标移动改变的