Offset line styles on polygons (with or without holes) seem to work ok with the following notes: 1. Draw a complementary top and bottom offset as separate styles in milisted.exe , so regardless of the direction of the poly, one will provide the desired inside or outside style. I drew a solid polyline at 4 pixel offset from centre. 2. It seems that holes adopt the direction of the outer boundary, so will have consistent style as the outer boundary (not 100% sure about this). 3. There is a problem of end conditions on line styles (they are projected from the centreline and not intersected with adjacent segments). THis may impact the output quality. Make sure a single pixel width line is used. 4. The region style picker "sample display" is with reference to a particular poly direction and thus wont necessarily reflect the final display. The sample looks very jaggy compared to the displayed version. 5. Use the region picker to change styles between the "inside" and "outside" versions of the style (was using #120 & #121) seemed to result in no change sometimes (MI 5.5) - changing to a 3rd style and then to the required one fixed.
Line styles have to be faster and easier to work with than buffering to achieve a display effect. if there is a tool somewhere for setting all polys to the same (say clockwise) direction, the process might be a bit more predicatable. Phil. ----- Original Message ----- From: "Uffe Kousgaard" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, October 02, 2002 9:33 PM Subject: Re: MI-L Line Editor Tool (LineEdit.exe) > From: "Lars Nielsen" <[EMAIL PROTECTED]> > > Using a shifted line style won't work, since there's no restriction on the > > direction of a polygon border line. It might run either way around the > > polygon, rendering it impossible to know which side of the line is > > "inside" and which is "outside". That applies for all borders including > > "holes". Shifting a line sideways will then just as often be done outwards > > as inwards. > > SHP files has a restriction on them regarding the direction of polygon > border lines. So converting to first SHP file and then back again, may > ensure that all directions are the same. Outside borders are clockwise and > holes are anti-clockwise (or the opposite - I can't remember right now and > I don't have the documentation here). > > So perhaps a shifted line style could work. > > Regards > Uffe Kousgaard > > > > --------------------------------------------------------------------- > List hosting provided by Directions Magazine | www.directionsmag.com | > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > Message number: 3358 > --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 3381
