GetPartType

EtchBendLines/Bend.cs

@@ -8,8 +8,6 @@ namespace EtchBendLines
 {
     public class Bend
 	{
-        const double RadPerDeg = Math.PI / 180.0;
-
         public Line Line { get; set; }
 
 		public double YIntercept
@@ -32,7 +30,17 @@ namespace EtchBendLines
 			get { return Line.IsHorizontal(); }
 		}
 
-		public bool IsCollinearTo(Bend bend)
+        public bool IsParallelTo(Bend bend)
+        {
+            return Line.IsParallelTo(bend.Line);
+        }
+
+        public bool IsPerpendicularTo(Bend bend)
+        {
+            return Line.IsPerpendicularTo(bend.Line);
+        }
+
+        public bool IsCollinearTo(Bend bend)
 		{
 			if (bend.IsVertical || this.IsVertical)
 				return (bend.IsVertical && this.IsVertical && bend.YIntercept == this.YIntercept);
@@ -146,5 +154,14 @@ namespace EtchBendLines
 				return Math.Sqrt(x * x + y * y);
 			}
 		}
-	}
+
+        public double? Radius { get; set; }
+
+        public double? Angle { get; set; }
+
+        public override string ToString()
+        {
+            return $"{Direction.ToString()} {Angle}° R{Radius}";
+        }
+    }
 }

EtchBendLines/Extensions.cs

@@ -92,11 +92,47 @@ namespace EtchBendLines
             return NormalizeRad(Math.Atan2(y, x));
         }
 
-
         static double NormalizeRad(double angle)
         {
             double r = angle % TwoPI;
             return r < 0 ? TwoPI + r : r;
         }
+
+        public static bool IsPerpendicularTo(this Line line1, Line line2)
+        {
+            bool line1Vertical = line1.IsVertical();
+            bool line2Vertical = line2.IsVertical();
+
+            if (line1Vertical)
+                return line2.IsHorizontal();
+            else if (line2.IsVertical())
+                return line1.IsHorizontal();
+
+            return line1.Slope().IsEqualTo(-1 / line2.Slope());
+        }
+
+        public static bool IsParallelTo(this Line line1, Line line2)
+        {
+            if (line1.IsVertical())
+            {
+                if (line2.IsVertical())
+                    return true;
+
+                return false;
+            }
+            else if (line2.IsVertical())
+            {
+                return false;
+            }
+
+            return line2.Slope().IsEqualTo(line1.Slope());
+        }
+
+        public const double Epsilon = 0.00001;
+
+        public static bool IsEqualTo(this double a, double b, double tolerance = Epsilon)
+        {
+            return Math.Abs(b - a) <= tolerance;
+        }
     }
 }

EtchBendLines/Program.cs

@@ -34,8 +34,7 @@ namespace EtchBendLines
             foreach (var file in files)
             {
                 AddEtchLines(file);
-                Console.WriteLine("----------------------------------------------------------------");
-
+                Console.WriteLine();
             }
 
             PressAnyKeyToExit();
@@ -49,8 +48,7 @@ namespace EtchBendLines
 
         static void AddEtchLines(string filePath)
         {
-            var name = Path.GetFileNameWithoutExtension(filePath);
-            Console.WriteLine($"Adding etch lines to file \"{name}\"");
+            Console.WriteLine(filePath);
 
             var dxf = LoadDoc(filePath);
             var bendLines = GetBendLines(dxf);
@@ -90,8 +88,12 @@ namespace EtchBendLines
 			AssignBendDirections(bendLines, bendNotes);
 
 			var upBends = bendLines.Where(b => b.Direction == BendDirection.Up);
+            var upBendCount = upBends.Count();
+            var downBendCount = bendLines.Count - upBendCount;
 
-            Console.WriteLine($"{upBends.Count()} up bends, {bendLines.Count - upBends.Count()} down bends.");
+            Console.WriteLine($"{upBendCount} Up     {downBendCount} Down");
+
+            var partType = GetPartType(bendLines);
 
             foreach (var bendline in upBends)
             {
@@ -262,5 +264,62 @@ namespace EtchBendLines
 
             return bendNotes;
         }
+
+        static PartType GetPartType(List<Bend> bends)
+        {
+            if (bends.Count == 0)
+                return PartType.Flat;
+
+            var upBends = bends.Where(b => b.Direction == BendDirection.Up).ToList();
+            var downBends = bends.Where(b => b.Direction == BendDirection.Down).ToList();
+
+            if (upBends.Count == 0 || downBends.Count == 0)
+            {
+                // bends are going the same direction
+
+                if (bends.Count == 2 && bends[0].IsParallelTo(bends[1]))
+                    return PartType.Channel;
+
+                if (bends.Count == 4)
+                {
+                    var groups = bends.GroupBy(b => b.Line.Slope()).ToList();
+
+                    if (groups.Count == 2)
+                    {
+                        var bend1 = groups[0].First();
+                        var bend2 = groups[1].First();
+
+                        if (bend1.IsPerpendicularTo(bend2))
+                        {
+                            return PartType.Pan;
+                        }
+                    }
+                }
+            }
+
+            if (bends.Count == 1)
+                return PartType.Angle;
+
+            if (bends.Count == 2)
+            {
+                var bend1 = bends[0];
+                var bend2 = bends[1];
+
+                if (bend1.IsParallelTo(bend2))
+                    return PartType.ZAngle;
+            }
+
+            return PartType.Other;
+        }
+    }
+
+    public enum PartType
+    {
+        Flat,
+        Angle,
+        Channel,
+        Pan,
+        ZAngle,
+        Other
     }
 }