Wookey wrote:
That example (scrap bmb2_s3) has a streamway with sandbanks. Having got the large water area to work, I find that some of the sandbanks are sandy, but some are covered in water. What determines when an area follows the outer wall, or the sandbank border? IS the only way to be sure to get the right thing to split the wall at the sandbank?
When I have to draw something like this, I draw one border curve that goes behind the wall on those places, where wall is areas active border. In the output, such border and area are clipped by walls.
This gets back to the problem that making changes to line which surround areas is problematic - if you split a line that is part of an area then both lines losetheir IDs and the area breaks. This is a tricky problem, but what you really want is for the areas and lines to get re-written so they all still work.
May be in the future it will be neccessary, but again - every time I draw area that should be surrounded by walls also, I just let it overlap walls and in the output this are will be clipped correctly. Regards, S.