public static bool Create(IList <Vector2> vertices, float epsilon, out int dimension, out int[] indices)
{
Vector2ex.Information information = Vector2ex.GetInformation(vertices, epsilon);
if (information == null)
{
dimension = -1;
indices = null;
return(false);
}
int count = vertices.Count;
if (information.Dimension == 0)
{
dimension = 0;
int[] array = new int[1];
indices = array;
return(true);
}
if (information.Dimension == 1)
{
float[] array2 = new float[count];
Vector2 origin = information.Origin;
Vector2 vector = information.Direction[0];
for (int i = 0; i < count; i++)
{
Vector2 value = vertices[i] - origin;
array2[i] = vector.Dot(value);
}
ConvexHull1.Create(array2, epsilon, out dimension, out indices);
return(true);
}
dimension = 2;
Vector2[] array3 = new Vector2[count];
Vector2 min = information.Min;
float d = 1f / information.MaxRange;
for (int j = 0; j < count; j++)
{
array3[j] = (vertices[j] - min) * d;
}
Query2 query = new Query2(array3);
int num = information.Extreme[0];
int num2 = information.Extreme[1];
int num3 = information.Extreme[2];
ConvexHull2.Edge edge;
ConvexHull2.Edge edge2;
ConvexHull2.Edge edge3;
if (information.ExtremeCCW)
{
edge = new ConvexHull2.Edge(num, num2);
edge2 = new ConvexHull2.Edge(num2, num3);
edge3 = new ConvexHull2.Edge(num3, num);
}
else
{
edge = new ConvexHull2.Edge(num, num3);
edge2 = new ConvexHull2.Edge(num3, num2);
edge3 = new ConvexHull2.Edge(num2, num);
}
edge.Insert(edge3, edge2);
edge2.Insert(edge, edge3);
edge3.Insert(edge2, edge);
ConvexHull2.Edge edge4 = edge;
for (int k = 0; k < count; k++)
{
if (!ConvexHull2.Update(ref edge4, k, query))
{
dimension = -1;
indices = null;
return(false);
}
}
edge4.GetIndices(out indices);
return(true);
}
internal static Vector2ex.Information GetInformation(IList <Vector2> points, float epsilon)
{
if (points == null)
{
return(null);
}
int count = points.Count;
if (count == 0 || epsilon < 0f)
{
return(null);
}
Vector2ex.Information information = new Vector2ex.Information();
information.ExtremeCCW = false;
float num2;
float num = num2 = points[0].x;
int num3 = 0;
int num4 = 0;
float num6;
float num5 = num6 = points[0].y;
int num7 = 0;
int num8 = 0;
for (int i = 1; i < count; i++)
{
float num9 = points[i].x;
if (num9 < num2)
{
num2 = num9;
num3 = i;
}
else if (num9 > num)
{
num = num9;
num4 = i;
}
num9 = points[i].y;
if (num9 < num6)
{
num6 = num9;
num7 = i;
}
else if (num9 > num5)
{
num5 = num9;
num8 = i;
}
}
information.Min.x = num2;
information.Min.y = num6;
information.Max.x = num;
information.Max.y = num5;
information.MaxRange = num - num2;
information.Extreme[0] = num3;
information.Extreme[1] = num4;
float num10 = num5 - num6;
if (num10 > information.MaxRange)
{
information.MaxRange = num10;
information.Extreme[0] = num7;
information.Extreme[1] = num8;
}
information.Origin = points[information.Extreme[0]];
if (information.MaxRange < epsilon)
{
information.Dimension = 0;
information.Extreme[1] = information.Extreme[0];
information.Extreme[2] = information.Extreme[0];
information.Direction[0] = Vector2ex.Zero;
information.Direction[1] = Vector2ex.Zero;
return(information);
}
information.Direction[0] = points[information.Extreme[1]] - information.Origin;
information.Direction[0].Normalize();
information.Direction[1] = -information.Direction[0].Perp();
float num11 = 0f;
float num12 = 0f;
information.Extreme[2] = information.Extreme[0];
for (int j = 0; j < count; j++)
{
Vector2 value = points[j] - information.Origin;
float num13 = information.Direction[1].Dot(value);
float num14 = Mathf.Sign(num13);
num13 = Mathf.Abs(num13);
if (num13 > num11)
{
num11 = num13;
num12 = num14;
information.Extreme[2] = j;
}
}
if (num11 < epsilon * information.MaxRange)
{
information.Dimension = 1;
information.Extreme[2] = information.Extreme[1];
return(information);
}
information.Dimension = 2;
information.ExtremeCCW = (num12 > 0f);
return(information);
}
