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 System.Threading.Tasks;
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namespace HotelPms.Share.Windows.GraphicsApi
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{
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public class Geometry
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{
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/// <summary>
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/// 任意二点の距離
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/// </summary>
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/// <param name="coord1"></param>
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/// <param name="coord2"></param>
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/// <returns></returns>
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public static double Dist2d(PointD coord1, PointD coord2)
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{
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double dx = coord1.X - coord2.X;
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double dy = coord1.Y - coord2.Y;
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return Math.Sqrt(dx * dx + dy * dy);
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}
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/// <summary>
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/// 二点同じ？
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/// </summary>
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/// <param name="coord1"></param>
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/// <param name="coord2"></param>
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/// <returns></returns>
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public static bool Equals(PointD coord1, PointD coord2)
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{
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return coord1.X == coord2.X && coord1.Y == coord2.Y;
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}
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/// <summary>
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/// 平行移動
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/// </summary>
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/// <param name="coords"></param>
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/// <param name="offset"></param>
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/// <returns></returns>
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public static IList<PointD> OffsetCoords(IList<PointD> coords, double offset)
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{
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var path = new List<PointD>();
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int N = coords.Count - 1;
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int max = N;
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double mi, mi1, li, li1, ri, ri1, si, si1, Xi1, Yi1;
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PointD p0, p1, p2;
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var isClosed = Equals(coords[0], coords[N]);
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if (!isClosed)
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{
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p0 = coords[0];
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p1 = coords[1];
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double qq1 = Dist2d(p0, p1);
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double qq2 = (p1.Y - p0.Y);
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double qq3 = qq2 / qq1;
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double qq4 = qq3 * offset;
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double qq5 = p0.X + qq4;
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p2 = new PointD(p0.X + (p1.Y - p0.Y) / Dist2d(p0, p1) * offset, p0.Y - (p1.X - p0.X) / Dist2d(p0, p1) * offset);
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path.Add(p2);
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coords.Add(coords[N].Clone());
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N++;
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max--;
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}
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for (var i = 0; i < max; i++)
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{
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p0 = coords[i];
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p1 = coords[(i + 1) % N];
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p2 = coords[(i + 2) % N];
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mi = (p1.Y - p0.Y) / (p1.X - p0.X);
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mi1 = (p2.Y - p1.Y) / (p2.X - p1.X);
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// Prevent alignements
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if (Math.Abs(mi - mi1) > 1e-10) //0.0000000001
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{
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li = Math.Sqrt((p1.X - p0.X) * (p1.X - p0.X) + (p1.Y - p0.Y) * (p1.Y - p0.Y));
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li1 = Math.Sqrt((p2.X - p1.X) * (p2.X - p1.X) + (p2.Y - p1.Y) * (p2.Y - p1.Y));
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ri = p0.X + offset * (p1.Y - p0.Y) / li;
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ri1 = p1.X + offset * (p2.Y - p1.Y) / li1;
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si = p0.Y - offset * (p1.X - p0.X) / li;
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si1 = p1.Y - offset * (p2.X - p1.X) / li1;
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Xi1 = (mi1 * ri1 - mi * ri + si - si1) / (mi1 - mi);
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Yi1 = (mi * mi1 * (ri1 - ri) + mi1 * si - mi * si1) / (mi1 - mi);
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// Correction for vertical lines
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if (p1.X - p0.X == 0)
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{
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Xi1 = p1.X + offset * (p1.Y - p0.Y) / Math.Abs(p1.Y - p0.Y);
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Yi1 = mi1 * Xi1 - mi1 * ri1 + si1;
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}
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if (p2.X - p1.X == 0)
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{
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Xi1 = p2.X + offset * (p2.Y - p1.Y) / Math.Abs(p2.Y - p1.Y);
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Yi1 = mi * Xi1 - mi * ri + si;
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}
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path.Add(new PointD(Xi1, Yi1));
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}
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}
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if (isClosed)
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{
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path.Add(path[0].Clone());
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}
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else
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{
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coords.RemoveAt(coords.Count - 1);
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p0 = coords[coords.Count - 1];
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p1 = coords[coords.Count - 2];
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p2 = new PointD(p0.X - (p1.Y - p0.Y) / Dist2d(p0, p1) * offset, p0.Y + (p1.X - p0.X) / Dist2d(p0, p1) * offset);
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path.Add(p2);
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}
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return path;
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}
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}
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}
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