136 lines
4.5 KiB
C#
136 lines
4.5 KiB
C#
using FarseerPhysics;
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using FarseerPhysics.Common;
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using FarseerPhysics.Dynamics;
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using FarseerPhysics.Factories;
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using Voronoi2;
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namespace Subsurface
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{
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class Level
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{
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private int seed;
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List<Body> bodies;
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List<VoronoiCell> cells;
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public Level(int seed, int siteCount, int width, int height)
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{
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this.seed = seed;
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Voronoi voronoi = new Voronoi(1.0);
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List<PointF> sites = new List<PointF>();
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Random rand = new Random(seed);
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for (int i = 0; i < siteCount; i++)
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{
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sites.Add(new PointF((float)(rand.NextDouble() * width), (float)(rand.NextDouble() * width)));
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}
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List<GraphEdge> graphEdges = MakeVoronoiGraph(sites, voronoi, width, height);
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cells = new List<VoronoiCell>();
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foreach (GraphEdge ge in graphEdges)
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{
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for (int i = 0; i<2; i++)
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{
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int site = (i==0) ? ge.site1 : ge.site2;
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VoronoiCell cell = cells.Find(c => c.site == site);
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if (cell == null)
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{
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cell = new VoronoiCell(site);
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cells.Add(cell);
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}
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if (!cell.edges.Contains(ge)) cell.edges.Add(ge);
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}
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}
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bodies = new List<Body>();
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foreach (VoronoiCell cell in cells)
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{
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//List of vectors defining my custom poly
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List<Vector2> vlist = new List<Vector2>();
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foreach (GraphEdge ge in cell.edges)
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{
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if (vlist.Contains(ge.point1)) continue;
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vlist.Add(ge.point1);
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}
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if (vlist.Count < 2) continue;
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for (int i = 0; i < vlist.Count; i++ )
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{
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vlist[i] = ConvertUnits.ToSimUnits(vlist[i]);
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}
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//get farseer 'vertices' from vectors
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Vertices _shapevertices = new Vertices(vlist);
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//_shapevertices.Sort(less);
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//feed vertices array to BodyFactory.CreatePolygon to get a new farseer polygonal body
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Body _newBody = BodyFactory.CreatePolygon(Game1.world, _shapevertices, 15);
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_newBody.BodyType = BodyType.Static;
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_newBody.CollisionCategories = Physics.CollisionWall;
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bodies.Add(_newBody);
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}
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}
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public int Compare(Vector2 a, Vector2 b, Vector2 center)
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{
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if (a.X - center.X >= 0 && b.X - center.X < 0) return 1;
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if (a.X - center.X < 0 && b.X - center.X >= 0) return -1;
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if (a.X - center.X == 0 && b.X - center.X == 0)
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{
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if (a.Y - center.Y >= 0 || b.Y - center.Y >= 0) return Math.Sign(a.Y - b.Y);
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return Math.Sign(b.Y-a.Y);
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}
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// compute the cross product of vectors (center -> a) x (center -> b)
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float det = (a.X - center.X) * (b.Y - center.Y) - (b.X - center.X) * (a.Y - center.Y);
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if (det < 0) return 1;
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if (det > 0) return -1;
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// points a and b are on the same line from the center
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// check which point is closer to the center
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float d1 = (a.X - center.X) * (a.X - center.X) + (a.Y - center.Y) * (a.Y - center.Y);
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float d2 = (b.X - center.X) * (b.X - center.X) + (b.Y - center.Y) * (b.Y - center.Y);
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return Math.Sign(d1 - d2);
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}
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List<GraphEdge> MakeVoronoiGraph(List<PointF> sites, Voronoi voronoi, int width, int height)
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{
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double[] xVal = new double[sites.Count];
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double[] yVal = new double[sites.Count];
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for (int i = 0; i < sites.Count; i++)
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{
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xVal[i] = sites[i].X;
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yVal[i] = sites[i].Y;
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}
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return voronoi.generateVoronoi(xVal, yVal, 0, width, 0, height);
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}
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public void Render(SpriteBatch spriteBatch)
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{
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foreach (VoronoiCell cell in cells)
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{
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for (int i = 0; i<cell.edges.Count; i++)
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{
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GUI.DrawLine(spriteBatch, cell.edges[i].point1, cell.edges[i].point2, Microsoft.Xna.Framework.Color.Red);
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}
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}
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}
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}
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}
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