Latest Contributions by ScottMcNeil

ESRI finally provided the answer to this.  The registry setting is in a different location, but works the same as before. HKEY_CURRENT_USER_\Software\ESRI\Engine10.1\ArcMap\Settings add DWORD value, ReverseMouseWheel = 0 ... View more

Do the items that update flicker? No flicker on any item that doesn't move. Obviously, if it moves it is erased and redrawn.   I'm in the process of migrating from 9.3.1 to 10.1, but sticking with the engine for now.  Hope to have some time to experiment with the new runtime in the near future though. ... View more

I believe I ran into this same crash issue when I experimented with Graphics Tracker last year.  Never resolved it because I found the overall performance for my application to be inadequate (even without removing any items).  I ended up using BaseCustomLayer and partial redraws.  It was not too difficult overall, but was tricky to get it to work without redrawing all my objects (caused annoying flickering), so I had to put them into different layers to get them to draw independently.  Depending on how many objects you have this may be an option for you.  I currently use it with up to about 20 layers, each having between 5-10 objects with labels, each updating once per second, and have adequate performance for my application (CPU is kept fairly busy though).  I also check for updates in a timer routine to prevent too many redraws. ... View more

I should add that I can reverse the zoom direction in ArcMap 10.1 using the options setting, but this has no affect on zoom behavior in the  Arc engine application (not that this is a viable option-- just thought there may be a new registry value that might be useful). ... View more

Additional Note:  In the debugger, the Display.DisplayTransformation.SpatialReference member does not seem have the correct value.  The debugger shows the reference as that of "System.__ComObject".  On the working system the debugger correctly shows the object is an ESRI.ArcGIS.Geometry.ProjectedCoordinateSystemClass. ... View more

I have run into this problem as well.  I stumbled into it trying to redraw polylines on the map. Here is the thread I started. http://forums.arcgis.com/threads/32810 I have two problems using this approach.  1) often a layer's previous contents are left on the map (not removed), and 2) periodically, the entire map is repainted for no apparent reason... If I slow down my updates, I can make the first problem go away (not a practical solution for the real world...).  The second problem occurs regardless of how fast or slow I send my updates. ... View more

Hi Alex, My original implementation was using the foreground drawing method you describe, but there is no way to only redraw some of the items-- all foreground items must be redrawn.  I need to redraw only the items (polylines) that changed, which was my original reason for posting.  I tried using esriViewGraphics, but had no luck getting that to work. With my most recent attempts I am using a custom layer subclassed from BaseCustomLayer.  WIth this approach, no matter what draw phase parameter I provide to PartialRefresh(), my Draw() method override only gets invoked with a phase of esriDPGeography (which, I should note is actually a different enumeration type than is passed to PartialRefresh).  Neverthelss, according to ESRI documentation in my previous link, I should be able to refresh only the layer object passed to PartialRefresh.  I found these posts of others having similar PartialRefresh problems: http://forums.arcgis.com/threads/24958 http://forums.esri.com/Thread.asp?c=159&f=1707&t=180719 Based on suggestions in the Steven Dunn thread, I was able to make some improvements but its still not working correctly.  Draw() is now called on each of my layers independenty, but about 1/2  the time the the previous layer contents are left on the map (not removed).  Also, about once a second, it appears the entire map frame is repainted without ever needing to calling my layer's draw method... This is actually worse than redrawing all my layers since the entire map repaints, not just my layers. Thus, still working on it... ... View more

I tried using separate layers for groups of polylines and using the partialrefresh method that allows a single layer to be specified for redraw as described in docs (How to redraw the display) // Refresh a single layer. pMap.PartialRefresh(esriViewGeography, pLayer, null); http://edndoc.esri.com/arcobjects/9.2/net/7b7dfcf8-18bd-4b11-bc67-cf9af9bd6591.htm This partial refresh with an object reference passed does not call Draw() on my object/layer.  Draw only gets called if I provide null as the second parameter.  And as I expected, when I do that all of my polyline layers are refreshed (Draw is called on each layer)-- exactly what I wanted to avoid. Has anyone done something like this and been successful?  Doc also implies that using the esriViewGraphics phase individual elements can be refreshed.  Has anyone tried that? ... View more

Thanks for the suggestions.  The v10 GraphicsTracker looks promising but unfortunatley I am stuck using 9.3 for now, as my customer invested over 40K in it about a year and a half ago...   Also, I had tried using a dynamic display a while back and determined it was not well suited for the application.  Dont remember specifically but think it significantly degraded the map grahics. I am going to experiment some more with custom layers and see where that takes me.  I'm still not sure if its possible to force a refresh on a single custom layer without causing other custom layers to be redrawn.   If anyone has tried something like that, Id appriciate any input.  Thx, Scott ... View more