Significant Update of Processing Line-Us plotter

Programming and API
1

Yesterday i have significantly re-wrote the code for the main sketch. Using copilot for help i remade the code around functional programming paradigm this should significantly cleanup the code.

Now i am trying to fix squashing when you change the zoom level.

GitHub - bareimage/LineUs_SVG: Simple SVG plotter for the LineUs drawbot

2

I had the same issue with squashing when changing the zoom level while working on my Line-Us here in Italy. For me, the problem came from not keeping the aspect ratio consistent between the SVG coordinate system and the canvas/plotter space.

What helped was:

1-Calculate a uniform scale – Instead of scaling width and height separately, I used the same factor for both axes:

let scale = Math.min(canvasWidth / svgWidth, canvasHeight / svgHeight);
let x = (svgX * scale) + offsetX;
let y = (svgY * scale) + offsetY;

2-Keep aspect ratio locked – This prevents the drawing from getting stretched or squashed when zoom changes.
3-Center the drawing– By adjusting offsetX/offsetY after scaling, the plot stays neat in the middle without distortion.

Once I switched to this uniform scaling approach, the drawings stayed correct no matter the zoom level. It took me a bit to figure it out, but now my sketches look clean on paper.

Maybe this trick can also help with your updated code.

Best Regards

Chief Developer at

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