/// <summary>
/// Creates a new Polygon Instance.
/// </summary>
/// <param name="vertexes">the vertexes that make up the shape of the Polygon</param>
/// <param name="gridSpacing">
/// How large a grid cell is. Usualy you will want at least 2 cells between major vertexes.
/// The smaller this is the better precision you get, but higher cost in memory.
/// The larger the less precision and if it's to high collision detection may fail completely.
public PolygonShape(Vector2D[] vertexes, Scalar gridSpacing)
{
if (vertexes == null)
{
throw new ArgumentNullException("vertexes");
}
if (vertexes.Length < 3)
{
throw new ArgumentException("too few", "vertexes");
}
if (gridSpacing <= 0)
{
throw new ArgumentOutOfRangeException("gridSpacing");
}
this.vertexes = vertexes;
this.grid = new DistanceGrid(this, gridSpacing);
this.vertexNormals = VertexHelper.GetVertexNormals(this.vertexes);
VertexInfo info = VertexHelper.GetVertexInfo(vertexes);
this.inertia = info.Inertia;
this.centroid = info.Centroid;
this.area = info.Area;
}
public MultiPolygonShape(Vector2D[][] polygons, Scalar gridSpacing)
{
if (gridSpacing <= 0)
{
throw new ArgumentOutOfRangeException("gridSpacing");
}
if (polygons == null)
{
throw new ArgumentNullException("polygons");
}
if (polygons.Length == 0)
{
throw new ArgumentOutOfRangeException("polygons");
}
this.polygons = polygons;
this.vertexes = ConcatVertexes(polygons);
this.vertexNormals = CalculateNormals();
this.grid = new DistanceGrid(this, gridSpacing);
VertexInfo info = VertexHelper.GetVertexInfoOfRange(polygons);
this.inertia = info.Inertia;
this.centroid = info.Centroid;
this.area = info.Area;
}
