PolarGridHelper constructor

PolarGridHelper([ dynamic radius = 10, dynamic radials = 16, dynamic circles = 8, dynamic divisions = 64, dynamic color1 = 0x444444, dynamic color2 = 0x888888, ])

Implementation

factory PolarGridHelper(
    [radius = 10,
    radials = 16,
    circles = 8,
    divisions = 64,
    color1 = 0x444444,
    color2 = 0x888888]) {
  color1 = Color(color1);
  color2 = Color(color2);

  List<double> vertices = [];
  List<double> colors = [];

  // create the radials

  for (var i = 0; i <= radials; i++) {
    var v = (i / radials) * (Math.PI * 2);

    var x = Math.sin(v) * radius;
    var z = Math.cos(v) * radius;

    vertices.addAll([0, 0, 0]);
    vertices.addAll([x, 0, z]);

    var color = ((i & 1) != 0) ? color1 : color2;

    colors.addAll([color.r, color.g, color.b]);
    colors.addAll([color.r, color.g, color.b]);
  }

  // create the circles

  for (var i = 0; i <= circles; i++) {
    var color = ((i & 1) != 0) ? color1 : color2;

    var r = radius - (radius / circles * i);

    for (var j = 0; j < divisions; j++) {
      // first vertex

      var v = (j / divisions) * (Math.PI * 2);

      var x = Math.sin(v) * r;
      var z = Math.cos(v) * r;

      vertices.addAll([x, 0, z]);
      colors.addAll([color.r, color.g, color.b]);

      // second vertex

      v = ((j + 1) / divisions) * (Math.PI * 2);

      x = Math.sin(v) * r;
      z = Math.cos(v) * r;

      vertices.addAll([x, 0, z]);
      colors.addAll([color.r, color.g, color.b]);
    }
  }

  var geometry = BufferGeometry();
  geometry.setAttribute(
      'position', Float32BufferAttribute(Float32Array.from(vertices), 3));
  geometry.setAttribute(
      'color', Float32BufferAttribute(Float32Array.from(colors), 3));

  var material =
      LineBasicMaterial({"vertexColors": true, "toneMapped": false});

  var pgh = PolarGridHelper.create(geometry, material);

  pgh.type = 'PolarGridHelper';
  return pgh;
}