freesewing/plugins/plugin-annotations/src/grainline.mjs

const markers = `
<marker orient="auto" refY="4.0" refX="10.0" id="grainlineFrom" style="overflow:visible;" markerWidth="12" markerHeight="8">
	<path class="note fill-note" d="M 0,4 L 12,0 C 10,2 10,6  12,8 z" />
</marker>
<marker orient="auto" refY="4.0" refX="2.0" id="grainlineTo" style="overflow:visible;" markerWidth="12" markerHeight="8">
	<path class="note fill-note" d="M 12,4 L 0,0 C 2,2 2,6  0,8 z" />
</marker>`

const dflts = { text: 'grainline' }

// Export hooks and macros
export const grainlineHooks = {
  preRender: [
    function (svg) {
      if (svg.defs.indexOf(markers) === -1) svg.defs += markers
    },
  ],
}
export const grainlineMacros = {
  grainline: function (so = {}, { points, paths, Path, complete, store }) {
    if (so === false) {
      delete points.grainlineFrom
      delete points.grainlineTo
      delete paths.grainline
      if (store.cutlist?.setGrain) store.cutlist.setGrain(90) // Restoring default
      return true
    }
    so = {
      ...dflts,
      ...so,
    }
    // setGrain relies on plugin-cutlist
    if (typeof store.cutlist?.setGrain === 'function') {
      store.cutlist.setGrain(so.from.angle(so.to))
    }
    if (complete) {
      points.grainlineFrom = so.from.shiftFractionTowards(so.to, 0.05)
      points.grainlineTo = so.to.shiftFractionTowards(so.from, 0.05)
      paths.grainline = new Path()
        .move(points.grainlineFrom)
        .line(points.grainlineTo)
        .attr('class', 'note')
        .attr('marker-start', 'url(#grainlineFrom)')
        .attr('marker-end', 'url(#grainlineTo)')
        .attr('data-text', so.text)
        .attr('data-text-class', 'center fill-note')
    }
  },
}