Thanks for the clarification Eric. I stand corrected (and clarified)!
Sincerely, John E. Polasky Geographic Information Systems Manager The Schwan Food Company Home Service - West 115 West College Drive Marshall, MN 56258 phone - 507-537-8631 mailto:[EMAIL PROTECTED] Web: http://www.theschwanfoodcompany.com/ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, August 31, 2004 12:38 PM To: Christine Schildhauer Cc: [EMAIL PROTECTED] Subject: Re: MI-L drawing order for lines Christine and all of MapInfo -L, Let me dispel some incorrect information that is being listed. There is no way to permanently control the draw order of objects within a layer. Layers are the only unit of draw order. Objects are drawn in the order they come back from the spatial index and that is determined by the density of objects in an area, the size of the internal blocks and the implementation of the data source (MapInfo native files, MapInfo data stored in a database such as MapInfo SpatialWare or third party vendors such as Oracle where we have absolutely no say over the order). The order is definitely NOT the order in which the data is created and is not in any way related to the Rowids of the records. What makes some people think this is true is the fact that when you insert or edit data in MapInfo Professional, the edits are stored in a temporary separate file with its own indexes. MapInfo manages the issues so that only the latest edited version of the object is displayed. This fact results in a display order where objects that have not yet been saved are displayed on top. However, as soon as those changes are committed, that order is permanently lost. So, I suppose you could cut and paste data that you wanted on top, quickly print or save images of the map and then get the result you wanted. However, that is only temporary. Exporting and reimporting via MIF has essentially the same impact as a pack which can, in ways that are hard to determine, change the draw order. The best way to do this is definitely to separate the objects into separate tables or to use query tables to dynamically query the correct objects and put those result set tables into the correct layer order. The speed will be best as separate tables but depending on how much data you have, using queries may be and often is quite acceptable. I am interested in why this is not a viable option. As to why we do not have this feature, I would start a different thread on that. The short answer is that we could but it is unclear how one would decide what was drawn when. If the criteria was based on data, the implementation would best do queries just as you can now. If the criteria was arbitrary, then you have some draw order list, which is only manageable for small amounts of data and will be slow because the draw code can't use the spatial index. Like I said, if you want to continue this discussion, I would start a new thread. Eric Blasenheim Software Architect MapInfo Corporation Mail List: [EMAIL PROTECTED] From: on 08/31/2004 03:56 PM ZE2 To: <[EMAIL PROTECTED]> cc: Subject: MI-L drawing order for lines Hi list, is it possible to force Mapinfo to draw lines in a userdefined order within one layer ? I have one layer with lots of lines. The lines have a gray or yellow color. I would like to draw all grey lines first and the yellow ones on top of the grey. I know it would be possible to select the grey and the yellow ones in different queries or separat layers, and manage the order in the table manager - but we don't want to do it this way. Trying to sort the table with the grey lines as first datasets and the yellow lines as last datasets doesn't help. So far I thought Mapinfo draws objects in the order of the datasets but wrong... Any suggestions? Mit freundlichen Grüßen Christine Schildhauer Ingenieurgruppe IVV GmbH Saarbrücker Straße 36A 10405 Berlin Tel: (030) 818 772-13 Fax: (030) 818 772-22 MailTo:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> http:\\www.ivv-berlin.de <http://www.ivv-berlin.de/> --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 13137 --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 13150 --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 13151
