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Grid in mm slowly drifts (rounding error from mil?)

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jumpbike 2 years ago

If I set the grid and the snap to 0.05mm, when I hover the mouse over the first few grid points the coordinate match up but once I'm 45mm across the coordinates are now snapping to 45.011. This is highlighted by the PCB outline point being on 45mm but not matching up to the grid. Origin: ![image.png](//image.easyeda.com/pullimage/RS6bHiS2H89m9tHJvdrtDA8FRKq3BEALPYvnUEIC.png) 45mm point: ![image.png](//image.easyeda.com/pullimage/nMot6q8dG0WHkc2H0U05QxQ2CvoEsNxyfRhYAURr.png) Is this a known issue? It is a bit of a nightmare once I start modifying a part of the PCB outline as the new part snaps to the grid. thanks,

Edge Chromium 96.0.1054.43 Windows 10 EasyEDA 6.4.25

Comments

andyfierman 2 years ago

@jumpbike, I can't reproduce this. One question however: Why do you need to use a grid and a snap of 0.05mm? Using such a fine grid makes it hard to manually place things accurately. You may find life a lot easier if you use the coarsest grid and snap that you can and then, if you need to position something precisely, use the element's XY centre co-ordinates or use the Alignment and Distribute Array tools under Format.

Chrome 96.0.4664.45 Windows 10 EasyEDA 6.4.25

jumpbike 2 years ago

@andyfierman I was drawing a 'notch' in my PCB outline around a silk screen shape on a board edge component but as the notch doesn't line up to a coarse grid, the easiest way for me to get the lines around the notch and the straight again was to make the grid fine. I do this all the time in other software for work but I've never seen a rounding error in the grid before.

Edge Chromium 96.0.1054.43 Windows 10 EasyEDA 6.4.25

andyfierman 2 years ago

@jumpbike, Understood. Have you swapped between mil and mm at some point during the layout? I'm wondering if that might be where the rounding error comes in. EasyEDA does seem to have a problem with rounding errors but not being a programmer, I don't know how such things are dealt with in coding.

Firefox 95.0 Ubuntu EasyEDA 6.4.25

MikeDB 2 years ago

I see the same problem constantly. Before going to PCB fabrication I have to check every component and sometimes give them a little jiggle to get them back on-grid. I reported this bug years ago but never fixed.

Electron 4.2.10 Windows 10 EasyEDA 6.4.25

jumpbike 2 years ago

@andyfierman it's strange to see this issue on a PC program where many decimal places should not be an issue at all

Edge Chromium 96.0.1054.53 Windows 10 EasyEDA 6.4.25

andyfierman 2 years ago

You might like to change the Category of this topic to Bug Report.

Chrome 94.0.4606.61 AndroidOS 10 EasyEDA 6.4.25

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