Problem hatching radiussed elements.

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GrowMate
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Posts: 42
Joined: Tue Jan 26, 2021 11:45 pm

Problem hatching radiussed elements.

Post by GrowMate » Mon Jul 05, 2021 11:32 pm

I find that when filling shapes with solid colour that have radiussed sections, I can sometimes select a complete arc with a single click but on other occasions I can't. If I zoom in, I find that the arc has fragmented into segments so tiny that it's impractical to click on all of them and indeed the boundary indicator colour quickly 'dries up'. Is this a procedural error on my part, or is it a programming issue that has yet to be overcome?!

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Husky
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Joined: Wed May 11, 2011 9:25 am
Location: USA

Re: Problem hatching radiussed elements.

Post by Husky » Tue Jul 06, 2021 12:51 am

GrowMate wrote:
Mon Jul 05, 2021 11:32 pm
... or is it a programming issue that has yet to be overcome?!
No, there are different ways to built a shape. Tiny lines to built an arc etc is one of them.

Probably it is easy to convert it to a polyline but to help you effective I need to know the QCAD Version. An example drawing as dxf/dwg attached to this topic would help too ... :wink:
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CVH
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Joined: Wed Sep 27, 2017 4:17 pm

Re: Problem hatching radiussed elements.

Post by CVH » Tue Jul 06, 2021 8:39 am

Hi,
I know of solid Hatches their Arc boundary segments are interpolated with Line segments.
In fact, that counts for patterned hatches too.
As example, one can see that up close in a pdf with a solid hatched area at an Arc boundary segment (Without the boundary itself).
InterpolatedPdfArc.png
InterpolatedPdfArc.png (3.45 KiB) Viewed 3250 times

I suspect it is less of a computational effort to find trimming points between a boundary Line segment and a pattern Line segment.
Then again, I don't or I can't detect them at spline boundary segments.

I never had an Arc that was itself interpolated somehow.
I never had an interpolated Arc hatch boundary from an explosion of a 'curved' hatch entity itself.
For one, sticking to QCAD that is. It stores boundaries exactly as the shapes they are made of.
And second, I always keep a copy of my original boundaries and therefor I don't have to rely on such an explosion.

So, yes please, document how you achieved such interpolated Arc segments.

If the contour is simplex then you can start hatching with a contour selected or with a polyline of such a contour.
Double click near one of the segment of the contour or use (De-) Select Contour (TC).

Regards,
CVH

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