public void ProcessMouseWheel(Control sender, MouseEventArgs e)
{
double num11;
double num12;
double num13;
RectDouble visibleCanvasViewportBounds = this.canvasView.GetVisibleCanvasViewportBounds();
PointInt32 point = base.PointToClient(sender.PointToScreen(e.Location)).ToPointInt32();
PointDouble viewportPt = RectDoubleUtil.Clamp(visibleCanvasViewportBounds, point);
PointDouble extentPt = this.canvasView.ConvertViewportToExtent(viewportPt);
PointDouble num5 = this.canvasView.ConvertExtentToCanvas(extentPt);
double scaleRatio = this.canvasView.ScaleRatio;
PointDouble viewportCanvasOffset = this.canvasView.ViewportCanvasOffset;
double num8 = ((double)e.Delta) / scaleRatio;
double x = viewportCanvasOffset.X;
double y = viewportCanvasOffset.Y;
ScaleBasis scaleBasis = this.canvasView.ScaleBasis;
ScaleBasis ratio = ScaleBasis.Ratio;
if (Control.ModifierKeys == Keys.Shift)
{
num11 = x - num8;
num12 = y;
ratio = scaleBasis;
num13 = scaleRatio;
}
else if (Control.ModifierKeys == Keys.Control)
{
double num16;
double num14 = ((double)e.Delta) / 120.0;
double num15 = Math.Pow(1.12, Math.Abs(num14));
if (e.Delta > 0)
{
num16 = scaleRatio * num15;
}
else
{
num16 = scaleRatio / num15;
}
double num17 = this.canvasView.ClampScaleRatio(num16);
double num18 = Math.Round(num17, MidpointRounding.AwayFromZero);
if ((Math.Abs((double)(num18 - num17)) < (num18 * 0.1)) && (Math.Abs((double)(num18 - num17)) < Math.Abs((double)(num18 - scaleRatio))))
{
num13 = num18;
}
else
{
num13 = num17;
}
ratio = ScaleBasis.Ratio;
num11 = num5.X - (viewportPt.X / num13);
num12 = num5.Y - (viewportPt.Y / num13);
}
else if (Control.ModifierKeys == Keys.None)
{
num11 = x;
num12 = y - num8;
ratio = scaleBasis;
num13 = scaleRatio;
}
else
{
num11 = x;
num12 = y;
ratio = scaleBasis;
num13 = scaleRatio;
}
this.canvasView.ViewportCanvasOffset = new PointDouble(num11, num12);
this.canvasView.ScaleBasis = ratio;
this.canvasView.ScaleRatio = num13;
}
