feat: add FillPolicy record and FillHelpers.FillWithDirectionPreference

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-21 12:41:07 -04:00
parent 1a41eeb81d
commit 4586a53590
3 changed files with 96 additions and 0 deletions
@@ -0,0 +1,50 @@
+using OpenNest.Engine;
+using OpenNest.Engine.Fill;
+using OpenNest.Engine.Strategies;
+using OpenNest.Geometry;
+
+namespace OpenNest.Tests;
+
+public class FillWithDirectionPreferenceTests
+{
+    private readonly IFillComparer comparer = new DefaultFillComparer();
+    private readonly Box workArea = new(0, 0, 100, 100);
+
+    [Fact]
+    public void NullPreference_TriesBothDirections_ReturnsBetter()
+    {
+        var hParts = new List<Part> { TestHelpers.MakePartAt(0, 0, 10), TestHelpers.MakePartAt(12, 0, 10) };
+        var vParts = new List<Part> { TestHelpers.MakePartAt(0, 0, 10) };
+
+        var result = FillHelpers.FillWithDirectionPreference(
+            dir => dir == NestDirection.Horizontal ? hParts : vParts,
+            null, comparer, workArea);
+
+        Assert.Equal(2, result.Count);
+    }
+
+    [Fact]
+    public void PreferredDirection_UsedFirst_WhenProducesResults()
+    {
+        var hParts = new List<Part> { TestHelpers.MakePartAt(0, 0, 10), TestHelpers.MakePartAt(12, 0, 10) };
+        var vParts = new List<Part> { TestHelpers.MakePartAt(0, 0, 10), TestHelpers.MakePartAt(0, 12, 10), TestHelpers.MakePartAt(0, 24, 10) };
+
+        var result = FillHelpers.FillWithDirectionPreference(
+            dir => dir == NestDirection.Horizontal ? hParts : vParts,
+            NestDirection.Horizontal, comparer, workArea);
+
+        Assert.Equal(2, result.Count); // H has results, so H is returned (preferred)
+    }
+
+    [Fact]
+    public void PreferredDirection_FallsBack_WhenPreferredReturnsEmpty()
+    {
+        var vParts = new List<Part> { TestHelpers.MakePartAt(0, 0, 10) };
+
+        var result = FillHelpers.FillWithDirectionPreference(
+            dir => dir == NestDirection.Horizontal ? new List<Part>() : vParts,
+            NestDirection.Horizontal, comparer, workArea);
+
+        Assert.Equal(1, result.Count); // Falls back to V
+    }
+}