This is tricky!

Question

At least for me. And I certainly hope it is not for you guys so I can learn how to do it.

I have a mxd set up in layout view. If I mouse over a vertex of a feature, both the coordinates for the defined projection (meters), and coordinates of the vertex on the paper (inches) show up at the bottom of the ArcMap window, as shown in the attached image.

My question is, how do I get the "paper coordinates" (inch readings) via ArcObjects, without opening the mxd in ArcMap?

Thanks a lot!

untitled.JPG

YukunXing · Answer

Kirk,

I'd love to try it. However, the description of the TransformCoords is kinda confusing:
http://edndoc.esri.com/arcobjects/8.3/ComponentHelp/esriCore/IDisplayTransformation_TransformCoords.htm

At the bottom of the page it talks about TRANSFORM_TOMAP and TRANSFORM_TODEVICE flags, but I don't see it anywhere in the arguments list. Also when I tried to click on "WKSPoint" and "tagPONT" to get more information, I got a blank page.

Do you have any sample code, or other refernece I could use? Thank you!

KirkKuykendall · Answer

I'd try IDisplayTransformation.TransformCoords for this.

Call it twice, first using the IActiveView of the map to get into device coords, then using the IActiveView of the pagelayout to go from device coords into page coords (even though page coords are treated as "map" coords when looking at the args).

YukunXing · Answer

Can't seem to make it work. The x coordiantes of the point is 457613 (meter), however, neither the ToMapPoint nor the FromMapPoint function changed it, I always got the same number after the conversion, 457613.

I'm not sure if I did anything wrong, or this is not the method for what I need at all. Bounds and VisibleBounds properties are automatically set from the pagelayout object. DeviceFrame and resolution are not set. I'm not sure how to set DeviceFrame, and on the other hand, if the resolution property has anything to do with the outcome, I'm prbably looking at the wrong method.