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Author Topic: Vector double lines
bvb
Newbie
Posts: 7
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bvb
Post Vector double lines
on: August 28, 2014, 11:46
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Hey all!

Just broke out my polargraph after a year of travelling and wanted to draw some vectors for the first time.

I feel like I know my machine quite well, but I don't know the application that well.

Has anyone else recognised when and why the code will generate a line that the machine will draw once and then go over again?

Most of the time this does not happen to all the lines in the SVG/code, just most.

I've used several vectors and they've all been different, but this has happened with both paths and brush strokes.

So, anyone know how to fix it?

kongorilla
Pro
Posts: 362
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kongorilla
Post Re: Vector double lines
on: August 29, 2014, 07:28
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Hi bvb! I don't think I've ever seen what you're describing. Can you post a simple SVG that has segments that get drawn twice? I'll take a look at it.

sandy
Administrator
Posts: 1317
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sandy
Post Re: Vector double lines
on: August 29, 2014, 22:53
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Hello again, hope you had a nice trip 🙂

The SVG import is very simple - if there are double lines, it is because there are double lines in your SVG file. This happens a lot when I'm working with vector art created by autotrace type processes. What normally has happened is that I want to draw something like:

Image

Decomposed you would think this is simple, eight lines:

Image

But what isn't obvious from looking at it in Illustrator or inkscape is that this is not two overlapping, or nested shapes, it is actually two interlocking shapes:

Image

And when they are stacked, the boundary lines are naturally drawn twice.

It is a pain to fix unless you have simple enough artwork that you can fix it up by hand by deleting each contained shape, and relying on the hole it leaves. Alternatively if you're lucky, you can delete the contained shape in one fell swoop. Depends if you need _it's_ outline, or just it's ... er, inlines.

sn

bvb
Newbie
Posts: 7
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bvb
Post Re: Vector double lines
on: August 30, 2014, 08:20
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ah yeah, i tested some pens by doing a 1pt outline pattern and it worked out perfectly but doing a drawing for my friend who used the brush tool in illustrator, had double lines again.

this is the drawing, for kongo, but thanks for replying to me sandy, i think i know what you're saying.

https://www.dropbox.com/s/8bh2coanijpwqqy/meow%2C%20nerd.svg?dl=0

bvb
Newbie
Posts: 7
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bvb
Post Re: Vector double lines
on: August 30, 2014, 09:02
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okay after a bit of playing around i think i'm wrapping my head around how the paths are working in illustrator and how it translates to SVG and then the polargraph.

essentially, i need to draw in 1pt haha

kongorilla
Pro
Posts: 362
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kongorilla
Post Re: Vector double lines
on: August 30, 2014, 22:16
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bvb, here's a screenshot of part of your drawing displayed without fill. You can tell that it was drawn with a tool that creates outlines and fills, rather than just line segments. The polargraph is going to draw the outline segments, which in this case is going to look like it's drawing the lines twice.

When making a drawing, don't use a tool which has the purpose mimicking a brush or calligraphy pen, etc., because in order to create the varying line widths, they'll create filled objects. Just use a basic line segment tool instead.
Image

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