roundCorners method

void roundCorners({ double radius = 0.5, })

Implementation

void roundCorners({double radius = 0.5}) {
  var vertices = getVertices();
  var arcs = <ArcBetweenPoints>[];

  for (var tuple in adjacentNTuples(vertices, 3)) {
    var v1 = tuple[0];
    var v2 = tuple[1];
    var v3 = tuple[2];
    var vec1 = v2 - v1;
    var vec2 = v3 - v2;

    var unitVec1 = vec1.normalize();
    var unitVec2 = vec2.normalize();

    var angle = vec1.angleBetween(vec2) * radius.sign;
    var cutOffLength = radius * tan(angle / 2) / 2;
    var sign = vec1.cross(vec2).z.sign;
    var arc = ArcBetweenPoints(
        start: v2 - unitVec1 * cutOffLength,
        end: v2 + unitVec2 * cutOffLength,
        angle: sign * angle);
    arcs.add(arc);
  }

  clearPoints();

  arcs = [arcs.last, ...withoutLast(arcs)];
  for (var arc12 in adjacentPairs(arcs)) {
    var arc1 = arc12[0];
    var arc2 = arc12[1];
    appendPoints(arc1.getPoints());
    var line = Line(start: arc1.getEnd(), end: arc2.getStart());
    var lengthRatio = line.getLength() / arc1.getArcLength();
    line.insertNCurves((lengthRatio * arc1.getNumCurves()).toInt());
    appendPoints(line.getPoints());
  }
}