polygon hatches do not join at polygon boundaries

[tbonfort]

• support for hatches that are continuous from one polygon to the other
• support fot hatches that are continuous from one image request to the next

[kyngchaos]

misaligned hatches example

[kyngchaos]

I just ran into this problem also, only with WMS tiled requests (image attached). It looks like the hatches align across polygons for me (MS 6.0.1).

I'm guessing that hatches are aligned to the image request extents, so polygon hatches would align.

To make them align across image requests, I think it would need to align to projection coordinates, like 0, 0.

[havatv]

This functionality was suggested in RFC45 (see also #3846):

"give hatches and vector fills a stable geographical coordinate origin (0,0) to better support tiling and continuous rendering of neighbouring polygons"

[tbonfort]

committed in r12807.

imageObj now contains a refpoint pointObj object which contains the image coordinates of the (0,0) geographical point. This reference point it used to align the hatches across tiled requests.

[tbonfort]

autotest results updated in r12808

[rouault]

r12810 /trunk/mapserver/mapprimitive.c: Fix compilation with MSVC (#3847)

[havatv]

This is great news! I have tested with trunk, and I found an issue with hatches (angles between 90 and 180). See ticket #4095.