Hi,  I think I've found a couple of issues.

If objects are added to a flowchart (with autosizedoc=alldirections) the docextents aren't updated correctly (in the code attached, I'm looping over all visible boxes and arrows boudingboxes and trying to zoom to show just them.)

Also, when the subsequent zoomtorect is called where the docextents is incorrect due to the previous problem, and the zoomtorect rect is larger than the document, the following exception occurs:

System.ArgumentOutOfRangeException was unhandled
  Message="Value of '382' is not valid for 'Value'. 'Value' should be between 'minimum' and 'maximum'.\r\nParameter name: Value"
  Source="System.Windows.Forms"
  ParamName="Value"
  StackTrace:
      at System.Windows.Forms.ScrollBar.set_Value(Int32 value)
      at MindFusion.FlowChartX.FlowChart.resetScrollbars()
...

I would have thought another action other than an exception (perhaps if alldirections is set, then the docextents are extended.)

Thanks.

----------------

From visible objects:
minX = 400.0
minY = 0.0
width = 353.3059
height = 239.999985

ZoomToRect rect:
{X = 382.334717 Y = -11.999999
Width = 388.6365 Height = 264.0}

fcFlowChart.DocExtents:
{X = -14.5 Y = -19.05
Width = 311.5 Height = 229.05}

The code generating these values:
...
     foreach (Box box in fcFlowChart.Boxes)
     {
       if (box.Visible)
       {
         foundVisibleObject = true;
         if (box.BoundingRect.Left < minX)   minX = box.BoundingRect.Left;
         if (box.BoundingRect.Top < minY)    minY = box.BoundingRect.Top;
         if (box.BoundingRect.Right > maxX)  maxX = box.BoundingRect.Right;
         if (box.BoundingRect.Bottom > maxY) maxY = box.BoundingRect.Bottom;
       }
     }

     foreach (Arrow arrow in fcFlowChart.Arrows)
     {
       if (arrow.Visible)
       {
         foundVisibleObject = true;
         if (arrow.BoundingRect.Left < minX)   minX = arrow.BoundingRect.Left;
         if (arrow.BoundingRect.Top < minY)    minY = arrow.BoundingRect.Top;
         if (arrow.BoundingRect.Right > maxX)  maxX = arrow.BoundingRect.Right;
         if (arrow.BoundingRect.Bottom > maxY) maxY = arrow.BoundingRect.Bottom;
       }
     }

     float width = maxX - minX;
     float height = maxY - minY;

     if (foundVisibleObject)
       fcFlowChart.ZoomToRect(new RectangleF(minX - width * 0.05F, minY - height * 0.05F, width * 1.1F, height * 1.1F));
...

Thanks,

They are drawn with the API, so I've included a routine to update the docextents manually.

Paul.