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mkrabset / krabzcam

Online CAM tool for generating G-code from vector graphics and bitmaps
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why smaller in KrabzCAM #38

Closed CycloRetro closed 2 months ago

CycloRetro commented 12 months ago

Why are SVG files 33% smaller when imported into KrabzCAM? This bug makes it very difficult to scale things correctly.

davi-domo commented 12 months ago

Hello I don’t have that kind of problem You import can be a svg in inch and krabzcam is in millimeters

mkrabset commented 12 months ago

Hi, yes, sounds like this is related to metric vs imperial units. If this is so, I guess the imported shapes should be ~39.37% of the intended size, not 33%.

I'll look into it and see if there are some improvements to be made.

Should be easy to handle though, just set pivot to origin and scale by factor 2.54.

-Marius

CycloRetro commented 12 months ago

My KrabzCam settings are set to millimeters but still the exported file is exactly 33.3% smaller. This indicates to me its not a metric vs imperial issue.

mkrabset commented 12 months ago

Hmm, ok. I guess you need to scale by factor 3 then.. If you post a sample svg, I will have a look.

-Marius

mkrabset commented 12 months ago

I think I understand now...when you say 33% smaller, I assume you mean the scale is 3/4 of what it is supposed to be. So you need to multiply by 4/3, e.g. hit "s" and then "1.3333"+enter. (while mouse pointer is inside the 2d view)

I assume the reason for this is that KrabzCAM (and Inkscape) assume resolution 1inch=96px...while other tools, like Adobe Illustator use 1inch=72px.

I'll put in some words about this in the user manual.

-Marius

CycloRetro commented 11 months ago

Yes I'm using Adobe Illustrator but in millimetres as its more accurate and easier to work with on small designs. It would be fantastic if SVG files from Illustrator would import into KrabzCAM at the correct size like for like. Many of my designs are tiny, sometimes there's shapes only 0.01mm and currently KrabzCAM cannot correctly display tiny shapes.

mkrabset commented 11 months ago

I'm not sure if there is an easy and consistent way to determine original DPI on an svg file.

but.. I've added a new 'Settings'-button. image

...with a dialogue where you can set tolerance (detail level) and svg DPI. image

The values are stored in the browser local storage, so you only have to set the values once (for each browser).

This is a bit experimental, so don't be surprised if problems occur. :-) Feedback is appreciated.

-Marius

CycloRetro commented 11 months ago

Its displaying the tiny shapes well now, thank you. But the sizing issue is still unsolved.

mkrabset commented 11 months ago

@CycloRetro if you post a sample SVG and a description of what dimension you expect, then I will have a look.