private void toolStripButtonZoomIn_Click(object sender, EventArgs e)
{
float[] ratios = new float[] { 0.5F, 0.6F, 0.7F, 0.8F, 0.9F, 1.0F, 1.2F, 1.5F, 2.0F };
int n = 0;
foreach (float f in ratios)
{
n ++;
if (this.ViewRatio == f && n < ratios.Length)
{
this.ViewRatio = ratios[n];
break;
}
}
}