#75 support vertical writing mode fonts

src/UglyToad.PdfPig.Tests/Fonts/CidFonts/VerticalWritingMetricsTests.cs

@@ -0,0 +1,62 @@
+namespace UglyToad.PdfPig.Tests.Fonts.CidFonts
+{
+    using System.Collections.Generic;
+    using PdfPig.Fonts.CidFonts;
+    using PdfPig.Geometry;
+    using Xunit;
+
+    public class VerticalWritingMetricsTests
+    {
+        private readonly VerticalVectorComponents defaults = new VerticalVectorComponents(250, 600);
+
+        [Fact]
+        public void UsesDefaultWhenOverridesNull()
+        {
+            var data = new VerticalWritingMetrics(defaults, null, null);
+
+            Assert.Empty(data.IndividualVerticalWritingDisplacements);
+            Assert.Empty(data.IndividualVerticalWritingPositions);
+
+            var position = data.GetPositionVector(60, 250);
+            Assert.Equal(defaults.Position, position.Y);
+
+            var displacement = data.GetDisplacementVector(32);
+            Assert.Equal(defaults.Displacement, displacement.Y);
+        }
+
+        [Fact]
+        public void DefaultXComponentsOfVectorsAreCorrect()
+        {
+            var data = new VerticalWritingMetrics(defaults, null, null);
+
+            var position = data.GetPositionVector(9, 120);
+            Assert.Equal(120 / 2m, position.X);
+
+            var displacement = data.GetDisplacementVector(10);
+            Assert.Equal(0m, displacement.X);
+        }
+
+        [Fact]
+        public void UsesVectorOverridesWhenPresent()
+        {
+            var data = new VerticalWritingMetrics(defaults, new Dictionary<int, decimal> {{7, 120}},
+                new Dictionary<int, PdfVector> {{7, new PdfVector(25, 250)}});
+
+            var position = data.GetPositionVector(7, 360);
+            Assert.Equal(25, position.X);
+            Assert.Equal(250, position.Y);
+
+            var displacement = data.GetDisplacementVector(7);
+            Assert.Equal(0, displacement.X);
+            Assert.Equal(120, displacement.Y);
+
+            var defaultPosition = data.GetPositionVector(6, 100);
+            Assert.Equal(50, defaultPosition.X);
+            Assert.Equal(defaults.Position, defaultPosition.Y);
+
+            var defaultDisplacement = data.GetDisplacementVector(6);
+            Assert.Equal(0, defaultDisplacement.X);
+            Assert.Equal(defaults.Displacement, defaultDisplacement.Y);
+        }
+    }
+}