Symbol line direction in curved polygon

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      Barry Kelly

      I am modifying a GS hedge object to make it a little more useful for myself.
      I want to add a ‘grass’ symbol line type to the perimeter in plan to make it look a little more hedgy.
      This works fine when the perimeter is closed on a curved hedge.
      But as soon as I use the masking code to turn off the line for one edge the line on the inside curve inverts for some reason.
      There is no problem at all for a straight hedge – only when the polygon has a curve it seems.

      Here is the code used for the polygon.

      rad = 1.000
      breit = 0.500
      wink = 90
      end_1_swch = 1
      end_2_swch = 0	 !!change to 1 to close polygon
      poly2_b 7,1+2+4,gs_fill_pen,gs_back_pen,
      	rad, 0,3001

      Reversing the polygon doesn’t help either.

      add2 1.5, 0
      poly2_b 7,1+2+4,gs_fill_pen,gs_back_pen,
      	rad, 0,1
      del 1

      Even using ARC2 won’t help as you can’t reverse the direction of the line and can’t use a negative radius.

      Is this a bug (and if so can it be fixed)?
      Any ideas for a solution that doesn’t involve creating a new symbol line type that is reversed in the y direction and then using two polygons with various edges hidden or not?

      I am guessing that the positive y portion of a symbol line will always project towards the centre of an arc unless in a closed polygon with visible edges in which the direction can be reversed depending on the order of node scripting.



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