how do I create offset hatches

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how do I create offset hatches

Postby LeoP » Thu Mar 04, 2010 4:40 pm

In cross sections where the section plane is folded, it is some times necessary to indicate the location of this fold line by shifting the hatch pattern by half the pitch on either side (standard NEN-ISO-128-40).

How do I do that in QCAD 2.2.2.0 Professional, short of drawing every single line of the hatch?
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Postby andrew » Thu Mar 04, 2010 10:25 pm

I'm not sure I understand your question.

For any shape of hatch, you will have to create the exact hatch boundary first, then hatch it. Note that the hatch boundary might be placed on an separate layer, so it can be easily hidden if desired.

If you need full control over every single line of a hatch, you might want to explode it after creation. This splits the hatch up into line segments: Modify - Explode.
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Postby LeoP » Fri Mar 05, 2010 12:09 am

I know it sounds a bit weird (when done right, it looks great though).

What I some times need is a way to hatch two adjacent shapes with the same pattern, while the hatch lines do not continue from one shape to the next. Even when I hatch these two shapes separately, it still looks like the hatch is made from one (the combined) shape.

Exploding the hatch after creating does not solve the problem: I would then need to delete every other line in both hatches... I have no 'externally accessible' storage space, otherwise I could show exactly what is needed in a little drawing.
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Postby andrew » Fri Mar 05, 2010 9:11 am

I think I understand now. There is no offset parameter for hatch patterns. However, you can most likely solve the problem with a separate hatch pattern in which the lines have the same angle but different positions than in the original hatch:

Image

The hatch pattern at the left is "ansi31" (included with QCAD), the one at the right "ansi31b" (new). You can download ansi31b from here:

http://www.ribbonsoft.com/qcad/ansi31b.dxf

Save it into the "patterns" directory of QCAD, then restart QCAD to start using the new pattern.
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Postby LeoP » Fri Mar 05, 2010 10:49 am

Spot on! :D
According to NEN-ISO-128-40, the vertical separation line would have to be omitted, but that's trivial.
I'll have a look into pattern design, but use your supplied one for now.

Thanks.
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