// TODO: Use _polygonShape.Vertices instead of _bottomLeftVertices, etc...
public void Iterate(int iterationNumber = 1)
{
if (iterationNumber == 0)
{
return;
}
var minY = 0f;
var maxY = 0f;
var bottomVertex = _bottomLeftVertices.Last();
// We revert it earlier
_topLeftVertices.Reverse();
var topVertex = Vector2.Zero;
if (_topLeftVertices.Count > 0)
{
topVertex = _topLeftVertices.Last();
}
for (var i = 0; i < iterationNumber; i++)
{
var possibleDirections = new List <Direction>()
{
Direction.Up, Direction.Down, Direction.Right, Direction.UpRight, Direction.DownRight
};
if (bottomVertex.Y <= _step)
{
possibleDirections.Remove(Direction.Up);
possibleDirections.Remove(Direction.UpRight);
possibleDirections.Remove(Direction.Right);
}
if (i == iterationNumber - 1 || _bottomLeftVertices.Count == 1)
{
possibleDirections.Remove(Direction.Down);
possibleDirections.Remove(Direction.Up);
}
bottomVertex = GenerateRandomPosition(bottomVertex, possibleDirections, ref _bottomRightLastDirection);
if (bottomVertex.Y > maxY)
{
maxY = bottomVertex.Y;
}
_bottomLeftVertices.Add(bottomVertex);
_size.X = bottomVertex.X * 2;
// Update top part
while (topVertex.X < bottomVertex.X)
{
possibleDirections = new List <Direction>()
{
Direction.Up, Direction.Down, Direction.Right, Direction.UpRight, Direction.DownRight
};
if (topVertex.Y >= -_step)
{
possibleDirections.Remove(Direction.Down);
possibleDirections.Remove(Direction.DownRight);
possibleDirections.Remove(Direction.Right);
}
topVertex = GenerateRandomPosition(topVertex, possibleDirections, ref _topRightLastDirection);
if (topVertex.Y < minY)
{
minY = topVertex.Y;
}
_topLeftVertices.Add(topVertex);
}
}
// Generate vertical symmetry
_bottomRightVertices = GenerateSymmetry(_bottomLeftVertices, Symmetry.Vertical, _size.X / 2f);
_topRightVertices = GenerateSymmetry(_topLeftVertices, Symmetry.Vertical, _size.X / 2f);
var centerVerticesDistance = _bottomRightVertices.First().Y + _topRightVertices.First().Y;
_size.Y = Math.Abs(minY - maxY);
Origin = new Vector2(_size.X / 2f, centerVerticesDistance / 2f);
// We want CCW order
_topRightVertices.Reverse();
_topLeftVertices.Reverse();
var vertices = new List <Vector2>();
vertices.AddRange(_bottomLeftVertices);
vertices.AddRange(_bottomRightVertices);
vertices.AddRange(_topRightVertices);
vertices.AddRange(_topLeftVertices);
_polygonShape.UpdateVertices(vertices.ToArray());
}