Added missing file

Source/Plugins/BuilderModes/VisualModes/SlopeArcher.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using CodeImp.DoomBuilder.Editing;
+using CodeImp.DoomBuilder.Map;
+using CodeImp.DoomBuilder.VisualModes;
+using CodeImp.DoomBuilder.Geometry;
+
+namespace CodeImp.DoomBuilder.BuilderModes
+{
+	internal class SlopeArcher
+	{
+		BaseVisualMode mode;
+		private List<IVisualEventReceiver> sectors;
+		private VisualSidedefSlope handle1;
+		private VisualSidedefSlope handle2;
+		private double theta;
+		private double offsetangle;
+		private double scale;
+		private int baseheight;
+		private double baseheightoffset;
+		private double heightoffset;
+		private Line2D handleline;
+		private double length;
+
+		public double Theta { get { return theta; } set { theta = value; CalculateBaseHeightOffset(); } }
+		public double OffsetAngle { get { return offsetangle; } set { offsetangle = value; CalculateBaseHeightOffset(); } }
+		public double Scale { get { return scale; } set { scale = value; } }
+		public int Baseheight { get { return baseheight; } }
+		public double HeightOffset { get { return heightoffset; } set { heightoffset = value; } }
+
+		public SlopeArcher(BaseVisualMode mode, List<IVisualEventReceiver> sectors, VisualSidedefSlope handle1, VisualSidedefSlope handle2, double theta, double offsetangle, double scale)
+		{
+			this.mode = mode;
+			this.sectors = sectors;
+			this.handle1 = handle1;
+			this.handle2 = handle2;
+			this.theta = theta;
+			this.offsetangle = offsetangle;
+			this.scale = scale;
+			heightoffset = 0.0;
+
+			handleline = new Line2D(handle1.GetCenterPoint(), handle2.GetCenterPoint());
+			length = handleline.GetLength();
+
+			baseheight = handle1.Level.type == SectorLevelType.Ceiling ? handle1.Level.sector.CeilHeight : handle1.Level.sector.FloorHeight;
+			baseheightoffset = 0.0;
+		}
+
+		private void CalculateBaseHeightOffset()
+		{
+			double right = Math.Cos(0.0);
+			double left = Math.Cos(theta + offsetangle);
+			double middle = Math.Cos(offsetangle);
+
+			double radius = length / (middle - left);
+			double leftdelimiter = Math.Cos(offsetangle + theta);
+			double rightdelimiter = Math.Cos(offsetangle);
+
+			double sectionstart = Math.Cos(offsetangle + theta) * radius;
+
+			baseheightoffset = Math.Sqrt(radius * radius - sectionstart * sectionstart) * scale;
+		}
+
+		public void ApplySlope()
+		{
+			double right = Math.Cos(0.0);
+			double left = Math.Cos(theta + offsetangle);
+			double middle = Math.Cos(offsetangle);
+
+			double radius = length / (middle - left);
+			double leftdelimiter = Math.Cos(offsetangle + theta);
+			double rightdelimiter = Math.Cos(offsetangle);
+
+			double sectionstart = Math.Cos(offsetangle + theta) * radius;
+
+			foreach (BaseVisualGeometrySector bvgs in sectors)
+			{
+				double u1 = 1.0;
+				double u2 = 0.0;
+
+				foreach (Sidedef sd in bvgs.Sector.Sides.Keys)
+				{
+					double intersection;
+					double bla;
+
+					if (!Line2D.GetIntersection(handleline.v1, handleline.v2, sd.Line.Line.v1.x, sd.Line.Line.v1.y, sd.Line.Line.v2.x, sd.Line.Line.v2.y, out bla, out intersection, false))
+						continue;
+
+					if (intersection < u1)
+						u1 = intersection;
+					if (intersection > u2)
+						u2 = intersection;
+				}
+
+				if (u1 == u2)
+				{
+					if (u1 >= 0.5)
+					{
+						u1 = 1.0;
+					}
+					else
+					{
+						u2 = 0.0;
+					}
+
+				}
+
+				double xpos1 = sectionstart + (u1 * length);
+				double xpos2 = sectionstart + (u2 * length);
+				double height1 = Math.Sqrt(radius * radius - xpos1 * xpos1) * scale;
+				double height2 = Math.Sqrt(radius * radius - xpos2 * xpos2) * scale;
+
+				if (double.IsNaN(height1))
+					height1 = 0.0;
+
+				if (double.IsNaN(height2))
+					height2 = 0.0;
+
+				height1 = height1 - baseheightoffset + baseheight;
+				height2 = height2 - baseheightoffset + baseheight;
+
+				height1 += heightoffset;
+				height2 += heightoffset;
+
+				double slopeangle = Vector2D.GetAngle(new Vector2D(xpos1, height1), new Vector2D(xpos2, height2));
+
+				Plane plane = new Plane(new Vector3D(handleline.GetCoordinatesAt(u1), height1), handleline.GetAngle() + Angle2D.PIHALF, slopeangle, true);
+
+				VisualSidedefSlope.ApplySlope(bvgs.Level, plane, mode);
+				bvgs.Sector.UpdateSectorGeometry(true);
+
+				//Debug.WriteLine(string.Format("sector: {0} | xpos1: {1}, height1: {2} | xpos2: {3}, height2: {4} | slope angle: {5}", bvgs.Sector.Sector.Index, xpos1, xpos2, height1, height2, slopeangle));
+			}
+		}
+	}
+}