VoronoiElements.cs

/*
 * Created by SharpDevelop.
 * User: Burhan
 * Date: 17/06/2014
 * Time: 09:29 م
 * 
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/*
      Copyright 2011 James Humphreys. All rights reserved.
    
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    THIS SOFTWARE IS PROVIDED BY James Humphreys ``AS IS\" AND ANY EXPRESS OR IMPLIED
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/*
 * C# Version by Burhan Joukhadar
 * 
 * Permission to use, copy, modify, and distribute this software for any
 * purpose without fee is hereby granted, provided that this entire notice
 * is included in all copies of any software which is or includes a copy
 * or modification of this software and in all copies of the supporting
 * documentation for such software.
 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR AT&T MAKE ANY
 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
 */
 
 
using Barotrauma;
using FarseerPhysics.Dynamics;
using Microsoft.Xna.Framework;
using System;
using System.Collections.Generic;
using System.Linq;
 
namespace Voronoi2
{
    public class DoubleVector2
    {
        public double X, Y;
 
        public DoubleVector2()
        {
        }
 
        public DoubleVector2(double x, double y)
        {
            this.X = x;
            this.Y = y;
        }
 
        public void SetPoint(double x, double y)
        {
            this.X = x;
            this.Y = y;
        }
 
        public void Normalize()
        {
            double length = System.Math.Sqrt(X * X + Y * Y);
            X /= length;
            Y /= length;
        }
    }
    
    // use for sites and vertecies
    public class Site
    {
        public DoubleVector2 Coord;
        public int SiteNbr;
 
        public void SetPoint(Vector2 point)
        {
            Coord.SetPoint(point.X, point.Y);
        }
        
        public Site ()
        {
            Coord = new DoubleVector2();
        }
    }
    
    public class Edge
    {
        public double a = 0, b = 0, c = 0;
        public Site[] ep;
        public Site[] reg;
        public int edgenbr;
        
        public Edge ()
        {
            ep = new Site[2];
            reg = new Site[2];
        }
    }
    
    
    public class Halfedge
    {
        public Halfedge ELleft, ELright;
        public Edge ELedge;
        public bool deleted;
        public int ELpm;
        public Site vertex;
        public double ystar;
        public Halfedge PQnext;
        
        public Halfedge ()
        {
            PQnext = null;
        }
    }
 
    public enum CellType
    {
        Solid, Empty, Path, Removed
    }
 
    public class VoronoiCell
    {
        public List<GraphEdge> Edges;
        public Site Site;
 
        public List<Vector2> BodyVertices;
 
        public Body Body;
 
        public CellType CellType;
 
        public Vector2 Translation;
 
        public bool Island;
 
        public bool IsDestructible;
        public bool DoesDamage;
 
        public Action OnDestroyed;
 
        public Vector2 Center
        {
            get { return new Vector2((float)Site.Coord.X, (float)Site.Coord.Y) + Translation; }
        }
        
        public VoronoiCell(Vector2[] vertices)
        {
            Edges = new List<GraphEdge>();
            BodyVertices = new List<Vector2>();
 
            Vector2 midPoint = Vector2.Zero;
            foreach (Vector2 vertex in vertices)
            {
                midPoint += vertex;
            }
            midPoint /= vertices.Length;
 
            for (int i = 0; i < vertices.Length; i++)
            {
                GraphEdge ge = new GraphEdge(vertices[i], vertices[MathUtils.PositiveModulo(i + 1, vertices.Length)]);
                System.Diagnostics.Debug.Assert(ge.Point1 != ge.Point2);
                Edges.Add(ge);
            }
 
            Site = new Site();
            Site.SetPoint(midPoint);
        }
 
        public VoronoiCell(Site site)
        {
            Edges = new List<GraphEdge>();
            BodyVertices = new List<Vector2>();
            //bodies = new List<Body>();
            this.Site = site;
        }
 
        public bool IsPointInside(Vector2 point)
        {
            if (!IsPointInsideAABB(point, margin: 0.0f)) { return false; }
            Vector2 transformedPoint = point - Translation;
            foreach (GraphEdge edge in Edges)
            {
                if (MathUtils.LineSegmentsIntersect(transformedPoint, Center - Translation, edge.Point1, edge.Point2)) { return false; }
            }
            return true;
        }
 
        public bool IsPointInsideAABB(Vector2 point2, float margin)
        {
            Vector2 transformedPoint = point2 - Translation;
            Vector2 max = transformedPoint + Vector2.One * margin;
            Vector2 min = transformedPoint - Vector2.One * margin;
 
            if (Edges.All(e => e.Point1.X < min.X && e.Point2.X < min.X)) { return false; }
            if (Edges.All(e => e.Point1.Y < min.Y && e.Point2.Y < min.Y)) { return false; }
            if (Edges.All(e => e.Point1.X > max.X && e.Point2.X > max.X)) { return false; }
            if (Edges.All(e => e.Point1.Y > max.Y && e.Point2.Y > max.Y)) { return false; }
 
            return true;
        }
    }
    
    public class GraphEdge
    {
        public Vector2 Point1, Point2;
        public Site Site1, Site2;
        public VoronoiCell Cell1, Cell2;
 
        public bool IsSolid;
        public bool OutsideLevel;
        public bool NextToCave, NextToMainPath, NextToSidePath;
 
        public Vector2 Center
        {
            get { return (Point1 + Point2) / 2.0f; }
        }
 
        public GraphEdge(Vector2 point1, Vector2 point2)
        {
            this.Point1 = point1;
            this.Point2 = point2;
        }
 
        public VoronoiCell AdjacentCell(VoronoiCell cell)
        {
            if (Cell1 == cell)
            {
                return Cell2;
            }
            else if (Cell2 == cell)
            {
                return Cell1;
            }
 
            return null;
        }
 
        public Vector2 GetNormal(VoronoiCell cell)
        {
            Vector2 dir = Vector2.Normalize(Point1 - Point2);
            Vector2 normal = new Vector2(dir.Y, -dir.X);
            if (cell != null && Vector2.Dot(normal, Vector2.Normalize(Center - (cell.Center - cell.Translation))) < 0)
            {
                normal = -normal;
            }
            return normal;
        }
 
        public override string ToString()
        {
            return "GraphEdge (" + Point1.ToString() + ", " + Point2.ToString() + ")";
        }
    }
    
    // للترتيب
    public class SiteSorterYX : IComparer<Site>
    {
        public int Compare ( Site p1, Site p2 )
        {
            DoubleVector2 s1 = p1.Coord;
            DoubleVector2 s2 = p2.Coord;
            if ( s1.Y < s2.Y )    return -1;
            if ( s1.Y > s2.Y ) return 1;
            if ( s1.X < s2.X ) return -1;
            if ( s1.X > s2.X ) return 1;
            return 0;
        }
    }
}