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

import { name, version } from "../package.json";

export default {
  name: name,
  version: version,
  hooks: {
    preRender: function(svg) {
      if (svg.attributes.get("freesewing:plugin-flip") === false)
        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;
      }
    }
  }
};