freesewing/packages/plugin-flip/src/index.js

import { name, version } from '../package.json'

export default {
  name: name,
  version: version,
  hooks: {
    preRender: svg => svg.attributes.set('freesewing:plugin-flip', version)
  },
  macros: {
    flip: function () {
      let flipped = null
      let ops = ['from', 'to', 'cp1', 'cp2']
      for (let id in this.points) {
        // Keep track of the amount of flips (needed to allow flipping twice, but also avoid double flips in paths below)
        if (flipped === null) {
          flipped = this.points[id].attributes.get('flipped')
          if (flipped === false) flipped = 1
          else flipped += 1
        }
        this.points[id].x = this.points[id].x * -1
        this.points[id].attributes.set('flipped', flipped)
      }
      for (let id of Object.keys(this.paths)) {
        for (let op in this.paths[id].ops) {
          for (let type of ops) {
            if (typeof this.paths[id].ops[op][type] !== 'undefined') {
              // Path ops can use points not listed in part.points. We should only flip those here
              // and not double flip the points flipped above
              let wasFlipped = this.paths[id].ops[op][type].attributes.get('flipped')
              if (wasFlipped !== false) wasFlipped = parseInt(wasFlipped)
              if (wasFlipped !== flipped) {
                this.paths[id].ops[op][type].x = this.paths[id].ops[op][type].x * -1
                this.paths[id].ops[op][type].attributes.set('flipped', flipped)
              }
            }
          }
        }
      }
      for (let id of Object.keys(this.snippets)) {
        // Snippets use points not listed in part.points. We should only flip those here
        // and not double flip the points flipped above
        let wasFlipped = this.snippets[id].anchor.attributes.get('flipped')
        if (wasFlipped !== false) wasFlipped = parseInt(wasFlipped)
        if (wasFlipped !== flipped) this.snippets[id].anchor.x = this.snippets[id].anchor.x * -1
      }
    },
  },
}