/// <summary>
/// Zooming out and in via mouse wheel handler
/// </summary>
private void PictureViewerFormMain_MouseWheel(object sender, MouseEventArgs e)
{
double modifier = 1.0 + 1.0 / ((double)e.Delta / 30.0);
zoom *= modifier;
if (GraphSettings.ImageWidth * zoom <= Width && zoom < 1)
{
zoom = (double)PictureBoxMain.Width / (double)GraphSettings.ImageWidth;
}
int lastW = PictureBoxMain.Width;
int lastH = PictureBoxMain.Height;
PictureBoxMain.SuspendLayout();
PictureBoxMain.Width = (int)(GraphSettings.ImageWidth * zoom);
PictureBoxMain.Height = (int)(GraphSettings.ImageHeight * zoom);
PictureBoxMain.Left = (int)(PictureBoxMain.Location.X + (lastW - GraphSettings.ImageWidth * zoom) / 2);
PictureBoxMain.Top = (int)(PictureBoxMain.Location.Y + (lastH - GraphSettings.ImageHeight * zoom) / 2);
PictureBoxMain.ResumeLayout();
}
