[Murphy23x]

Summary

Adds ten features to the sketch (GenerativeLineArt/GenerativeLineArt.pde) and updates the README and CONTRIBUTING. The side panel now has two tabs: Design (paper, layers, pattern parameters) and Output (plotter, clean-up, mask and export settings). The panel also scrolls when its contents don't fit.

• Plot time estimate: pen-down distance, pen-up travel and pen lifts per layer, converted to a time using configurable pen-down speed, travel speed and lift time. The total also shows in the status bar.
• Path clean-up: simplification (Ramer-Douglas-Peucker), joining paths whose ends nearly touch, dropping tiny pieces and duplicate paths, and a faster nearest-neighbour travel ordering that scales to tens of thousands of paths. It runs before the preview, so the preview, stats and export all use the same paths.
• Registration marks and pen test swatches: corner crosshairs drawn by every pen, plus a small test patch per pen in the bottom margin, plotted first.
• Undo / redo: buttons, Ctrl+Z, and Ctrl+Y or Ctrl+Shift+Z. A whole slider drag counts as one step; up to 200 steps.
• Batch export: writes N seed variations into exports/batch_<timestamp>/.
• Parameter locks: right-click a pattern parameter or the seed to lock it. Randomize, New seed and batch export leave locked values alone.
• G-code and HPGL export alongside SVG:
  • G-code is GRBL-style, with a Z-axis or servo (M3 S) pen lift, a dwell after each lift, and an M0 pause between pens.
  • HPGL uses pen n (SP1–SP4) for layer n.
• Masks: per layer, Off / Inside / Outside, using either typed text or a PNG/JPG/GIF/SVG image, with threshold and invert.
• Image pattern: turns a photo into a TSP line, stipple dots, hatching, a spiral or squiggle lines. Without a photo it uses a built-in demo picture.
• New patterns: Hex Truchet, Penrose (rhombs and/or arcs) and Hex maze.

Presets now also save the new settings, the mask and the locks. Older presets still load and get default values for anything new.

Behaviour change: clean-up is on by default (simplify 0.05 mm, merge gap 0.1 mm, minimum length 0.2 mm). Existing designs will export slightly fewer points and strokes. Set the sliders to 0 to switch it off.

Testing

• The sketch builds with the Processing 4.5.7 CLI, the same version CI uses.
• I ran the sketch headless (Xvfb) with a test script, then reviewed the screenshots:
  • every pattern and every Image style produces lines
  • masks, registration marks and pen tests render as expected
  • SVG, G-code and HPGL exports were checked by hand
  • batch export keeps locked seeds
  • undo/redo, locks with Randomize, and saving/loading presets all behave correctly
• Not tested:
  • real mouse and keyboard input: the file dialogs, right-click and Ctrl+Z on actual hardware
  • G-code or HPGL on a physical plotter

🤖 Generated with Claude Code

https://claude.ai/code/session_01CspRSgko45MN3D4Esk5wXs

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Generated by Claude Code