用鼠标滚轮改变pictureBox中图片的大小

用鼠标滚轮改变pictureBox中图片的大小

//用委托

private void Form_Load(object sender, EventArgs e)

{

    MouseWheel += Panel_MouseWheel;

}

private void Panel_MouseWheel(object sender, MouseEventArgs e)

{

    if (_myZoom < 0.05) return;

    //判断滚轮的方向

    if (e.Delta > 0)

        _myZoom += 0.05;

    else

        _myZoom -= 0.05;

    printPreviewControl1.Zoom = _myZoom;

}