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Crease Pattern Editor

This is a draft of a web software tool for drawing quick crease/slit patterns. Currently it works well for crease patterns that fit on an integer grid.

Features So Far

  • Graph-based: Always maintain a planar graph, automatically subdividing and merging together touching vertices
  • Draw a crease with two clicks or with dragging
  • Recolor existing creases as different types by dragging over them (easily recoloring just part of a line)
  • Fold angle support: enter degrees (or formula for degrees) to adjust mountain/valley fold amount (drawn via opacity)
  • Erase existing creases by dragging over them
  • Move vertices by dragging them (bringing all connected edges with them)
  • Snapping to grid or existing vertex (e.g. from intersection)
  • Cleanup to remove extra degree-0 or -2 vertices
  • Undo/redo
  • Save/export to .fold/.svg, including cutting (unwelding) of slits
  • CLI for bulk conversion: node cpedit.js --cleanup --fold --svg filename.cp
  • Title setting for document (file_title in fold format)
  • Page size setting (width and height)
  • Transform document by reflection or 90° rotation
  • Keyboard shortcuts:
    • Escape key cancels current operation
    • z for undo, Z or y for redo
    • Modes and line types list their key shortcut

Installation

  • Type npm install to do the necessary preparation
  • Type git submodule update --init --recursive to use Origami Simulator integration
  • Open cpedit.html in a web browser such as Chrome