createPath method

@override Map<String, dynamic> createPath(String char, double scale, double offsetX, double offsetY, dynamic data,)

Implementation

@override
Map<String, dynamic> createPath(
    String char, double scale, double offsetX, double offsetY, data) {
  final font = data["font"];
  List<int> glyphs = List<int>.from(font.stringToGlyphs(char));

  final gid = glyphs[0];
  final charPath = font.glyphToPath(gid);

  final preScale = (100000) / ((font.head["unitsPerEm"] ?? 2048) * 72);
  // final _preScale = 1;
  final ha = (font.hmtx["aWidth"][gid] * preScale).round();

  final path = ShapePath();

  double x = 0.1;
  double y = 0.1;
  double cpx, cpy, cpx1, cpy1, cpx2, cpy2;

  final cmds = charPath["cmds"];
  List<double> crds = List<double>.from(charPath["crds"].map((e) => e.toDouble()));
  crds = crds.map((n) => (n * preScale).roundToDouble()).toList();

  int i = 0;
  int l = cmds.length;
  for (int j = 0; j < l; j++) {
    final action = cmds[j];

    switch (action) {
      case 'M': // moveTo
        x = crds[i++] * scale + offsetX;
        y = crds[i++] * scale + offsetY;

        path.moveTo(x, y);
        break;

      case 'L': // lineTo

        x = crds[i++] * scale + offsetX;
        y = crds[i++] * scale + offsetY;

        path.lineTo(x, y);

        break;

      case 'Q': // quadraticCurveTo

        cpx = crds[i++] * scale + offsetX;
        cpy = crds[i++] * scale + offsetY;
        cpx1 = crds[i++] * scale + offsetX;
        cpy1 = crds[i++] * scale + offsetY;

        path.quadraticCurveTo(cpx1, cpy1, cpx, cpy);

        break;

      case 'B':
      case 'C': // bezierCurveTo

        cpx = crds[i++] * scale + offsetX;
        cpy = crds[i++] * scale + offsetY;
        cpx1 = crds[i++] * scale + offsetX;
        cpy1 = crds[i++] * scale + offsetY;
        cpx2 = crds[i++] * scale + offsetX;
        cpy2 = crds[i++] * scale + offsetY;

        path.bezierCurveTo(cpx, cpy, cpx1, cpy1, cpx2, cpy2);

        break;
    }
  }

  return {"offsetX": ha * scale, "path": path};
}