private void GViewer_KeyDown(object sender, KeyEventArgs e)
{
Debug.Print("{0} {1:X} {2}", e.KeyCode, e.KeyValue, e.KeyData);
if (e.KeyCode == Keys.Add || e.KeyCode == Keys.Oemplus)
{
gViewer.ZoomF *= 1.2;
e.Handled = true;
}
else if (e.KeyCode == Keys.Subtract || e.KeyCode == Keys.OemMinus)
{
gViewer.ZoomF /= 1.2;
e.Handled = true;
}
}