feat(io): add title block region detection with corner/edge scoring (phase 3)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-04-30 11:50:45 -04:00
parent 09a5339b51
commit 4f2a8d29d5
2 changed files with 275 additions and 0 deletions
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using CSMath;
 using OpenNest.Geometry;
 using OpenNest.IO;
 using Xunit;
@@ -148,5 +149,97 @@ namespace OpenNest.Tests.IO

            Assert.Contains(entities[0].Id, result);
        }
+
+        [Fact]
+        public void DetectTitleBlock_FlagsEntitiesInTextDenseCorner()
+        {
+            var partLine1 = new Line(5, 70, 25, 120) { Layer = new Layer("0") };
+            var partLine2 = new Line(25, 120, 45, 70) { Layer = new Layer("0") };
+            var partLine3 = new Line(45, 70, 5, 70) { Layer = new Layer("0") };
+
+            var tbLines = new List<Entity>();
+            for (var x = 50; x <= 85; x += 5)
+                tbLines.Add(new Line(x, 0, x, 30) { Layer = new Layer("0") });
+            for (var y = 0; y <= 30; y += 5)
+                tbLines.Add(new Line(50, y, 85, y) { Layer = new Layer("0") });
+
+            var entities = new List<Entity> { partLine1, partLine2, partLine3 };
+            entities.AddRange(tbLines);
+
+            var doc = BuildDocWithTexts(
+                (60, 5, "TITLE: Test Part"),
+                (60, 10, "DWG NO: 12345"),
+                (60, 15, "SCALE: 1:1"),
+                (60, 20, "REV: A"),
+                (60, 25, "MATERIAL: STEEL"));
+
+            var result = TitleBlockDetector.Detect(entities, doc);
+
+            foreach (var tb in tbLines)
+                Assert.Contains(tb.Id, result);
+            Assert.DoesNotContain(partLine1.Id, result);
+            Assert.DoesNotContain(partLine2.Id, result);
+            Assert.DoesNotContain(partLine3.Id, result);
+        }
+
+        [Fact]
+        public void DetectTitleBlock_NoFalsePositivesWithoutText()
+        {
+            var entities = new List<Entity>
+            {
+                new Line(30, 40, 50, 90) { Layer = new Layer("0") },
+                new Line(50, 90, 70, 40) { Layer = new Layer("0") },
+                new Line(70, 40, 30, 40) { Layer = new Layer("0") },
+            };
+
+            var result = TitleBlockDetector.Detect(entities, null);
+
+            Assert.Empty(result);
+        }
+
+        [Fact]
+        public void DetectTitleBlock_BottomEdgeStrip()
+        {
+            var partLine = new Line(20, 40, 80, 40) { Layer = new Layer("0") };
+
+            var tbLines = new List<Entity>();
+            for (var x = 0; x <= 100; x += 10)
+                tbLines.Add(new Line(x, 0, x, 20) { Layer = new Layer("0") });
+            for (var y = 0; y <= 20; y += 5)
+                tbLines.Add(new Line(0, y, 100, y) { Layer = new Layer("0") });
+
+            var entities = new List<Entity> { partLine };
+            entities.AddRange(tbLines);
+
+            var doc = BuildDocWithTexts(
+                (10, 5, "TITLE"),
+                (30, 5, "DWG NO"),
+                (50, 5, "SCALE"),
+                (70, 5, "REV"),
+                (90, 5, "DATE"));
+
+            var result = TitleBlockDetector.Detect(entities, doc);
+
+            foreach (var tb in tbLines)
+                Assert.Contains(tb.Id, result);
+            Assert.DoesNotContain(partLine.Id, result);
+        }
+
+        private static ACadSharp.CadDocument BuildDocWithTexts(
+            params (double x, double y, string value)[] texts)
+        {
+            var doc = new ACadSharp.CadDocument();
+            foreach (var (x, y, value) in texts)
+            {
+                var mtext = new ACadSharp.Entities.MText
+                {
+                    InsertPoint = new XYZ(x, y, 0),
+                    Value = value,
+                    Height = 2.0
+                };
+                doc.Entities.Add(mtext);
+            }
+            return doc;
+        }
    }
 }