mirror of
https://git.do.srb2.org/STJr/UltimateZoneBuilder.git
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74 lines
1.9 KiB
C#
74 lines
1.9 KiB
C#
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#region ================== Copyright (c) 2007 Pascal vd Heiden
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/*
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* Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
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* This program is released under GNU General Public License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#endregion
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#region ================== Namespaces
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Text;
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using CodeImp.DoomBuilder.Map;
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#endregion
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namespace CodeImp.DoomBuilder.Geometry
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{
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internal class SidedefAngleSorter : IComparer<Sidedef>
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{
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// Variables
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private float baseangle;
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private Vertex basevertex;
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// Constructor
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public SidedefAngleSorter(Sidedef baseside, Vertex basev)
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{
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// Initialize
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baseangle = baseside.Angle;
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if(baseside.Line.Start == basev) basevertex = baseside.Line.End;
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else basevertex = baseside.Line.Start;
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// We have no destructor
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GC.SuppressFinalize(this);
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}
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// Comparer
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public int Compare(Sidedef x, Sidedef y)
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{
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float ax, ay;
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float sx, sy;
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// Calculate x angle
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ax = Angle2D.Difference(baseangle, x.Angle);
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sx = x.Line.SideOfLine(basevertex.Position);
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if((sx < 0) && x.IsFront) ax += Angle2D.PI;
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if((sx > 0) && !x.IsFront) ax += Angle2D.PI;
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ax = Angle2D.Normalized(ax);
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// Calculate y angle
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ay = Angle2D.Difference(baseangle, y.Angle);
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sy = y.Line.SideOfLine(basevertex.Position);
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if((sy < 0) && x.IsFront) ay += Angle2D.PI;
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if((sy > 0) && !x.IsFront) ay += Angle2D.PI;
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ay = Angle2D.Normalized(ay);
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// Compare results
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if(ax < ay) return 1;
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else if(ax > ay) return -1;
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else return 0;
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}
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}
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}
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