Function convertToPathData

chapter24/docs/d3-graphviz.js:764–846

(originalData, guideData)

  }

  function convertToPathData(originalData, guideData) {
    if (originalData.tag == 'polygon') {
      var newData = shallowCopyObject(originalData);
      newData.tag = 'path';
      var originalAttributes = originalData.attributes;
      var newAttributes = shallowCopyObject(originalAttributes);
      var newPointsString = originalAttributes.points;
      if (guideData.tag == 'polygon') {
        var bbox = originalData.bbox;
        bbox.cx = bbox.x + bbox.width / 2;
        bbox.cy = bbox.y + bbox.height / 2;
        var pointsString = originalAttributes.points;
        var pointStrings = pointsString.split(' ');
        var normPoints = pointStrings.map(function (p) {
          var xy = p.split(',');
          return [xy[0] - bbox.cx, xy[1] - bbox.cy];
        });
        var x0 = normPoints[normPoints.length - 1][0];
        var y0 = normPoints[normPoints.length - 1][1];
        for (var i = 0; i < normPoints.length; i++, x0 = x1, y0 = y1) {
          var x1 = normPoints[i][0];
          var y1 = normPoints[i][1];
          var dx = x1 - x0;
          var dy = y1 - y0;
          if (dy == 0) {
            continue;
          } else {
            var x2 = x0 - y0 * dx / dy;
          }
          if (0 <= x2 && x2 < Infinity && (x0 <= x2 && x2 <= x1 || x1 <= x2 && x2 <= x0)) {
            break;
          }
        }
        var newPointStrings = [[bbox.cx + x2, bbox.cy + 0].join(',')];
        newPointStrings = newPointStrings.concat(pointStrings.slice(i));
        newPointStrings = newPointStrings.concat(pointStrings.slice(0, i));
        newPointsString = newPointStrings.join(' ');
      }
      newAttributes['d'] = 'M' + newPointsString + 'z';
      delete newAttributes.points;
      newData.attributes = newAttributes;
    } else /* if (originalData.tag == 'ellipse') */{
        var newData = shallowCopyObject(originalData);
        newData.tag = 'path';
        var originalAttributes = originalData.attributes;
        var newAttributes = shallowCopyObject(originalAttributes);
        var cx = originalAttributes.cx;
        var cy = originalAttributes.cy;
        var rx = originalAttributes.rx;
        var ry = originalAttributes.ry;
        if (guideData.tag == 'polygon') {
          var bbox = guideData.bbox;
          bbox.cx = bbox.x + bbox.width / 2;
          bbox.cy = bbox.y + bbox.height / 2;
          var p = guideData.attributes.points.split(' ')[0].split(',');
          var sx = p[0];
          var sy = p[1];
          var dx = sx - bbox.cx;