#21 add a test for accented characters and fill in more writing methods for content stream operators

the output is currently incorrect for accented characters

src/UglyToad.PdfPig.Tests/Writer/PdfDocumentBuilderTests.cs

@@ -207,6 +207,23 @@
             }
         }
 
+        [Fact]
+        public void CanWriteSinglePageWithAccentedCharacters()
+        {
+            var builder = new PdfDocumentBuilder();
+            var page = builder.AddPage(PageSize.A4);
+            
+            var path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Fonts", "TrueType");
+            var file = Path.Combine(path, "Roboto-Regular.ttf");
+
+            var font = builder.AddTrueTypeFont(File.ReadAllBytes(file));
+
+            page.AddText("é (lower case, upper case É).", 9, 
+                new PdfPoint(30, page.PageSize.Height - 50), font);
+
+            WriteFile(nameof(CanWriteSinglePageWithAccentedCharacters), builder.Build());
+        }
+
         private static void WriteFile(string name, byte[] bytes)
         {
             try

src/UglyToad.PdfPig/Filters/FlateFilter.cs

@@ -77,7 +77,7 @@
             {
                 using (var memoryStream = new MemoryStream(input))
                 {
-                    // The first 2 bytes are the header which DelfateStream does not support.
+                    // The first 2 bytes are the header which DeflateStream does not support.
                     memoryStream.ReadByte();
                     memoryStream.ReadByte();
 

src/UglyToad.PdfPig/Graphics/Operations/SpecialGraphicsState/ModifyCurrentTransformationMatrix.cs

@@ -5,6 +5,9 @@
     using Content;
     using PdfPig.Core;
 
+    /// <summary>
+    /// Modify the current transformation matrix by concatenating the specified matrix. 
+    /// </summary>
     internal class ModifyCurrentTransformationMatrix : IGraphicsStateOperation
     {
         public const string Symbol = "cm";

src/UglyToad.PdfPig/Graphics/Operations/SpecialGraphicsState/Pop.cs

@@ -4,9 +4,13 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Restore the graphics state by removing the most recently saved state from the stack and making it the current state.
+    /// </summary>
     internal class Pop : IGraphicsStateOperation
     {
         public const string Symbol = "Q";
+
         public static readonly Pop Value = new Pop();
 
         public string Operator => Symbol;
@@ -30,7 +34,8 @@
 
         public void Write(Stream stream)
         {
-            throw new NotImplementedException();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
         public override string ToString()

src/UglyToad.PdfPig/Graphics/Operations/SpecialGraphicsState/Push.cs

@@ -3,6 +3,9 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Save the current graphics state on the graphics state stack.
+    /// </summary>
     internal class Push : IGraphicsStateOperation
     {
         public const string Symbol = "q";
@@ -14,11 +17,6 @@
         {
         }
 
-        public override string ToString()
-        {
-            return Symbol;
-        }
-
         public void Run(IOperationContext context, IResourceStore resourceStore)
         {
             context.PushState();
@@ -26,7 +24,13 @@
 
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
+        }
+
+        public override string ToString()
+        {
+            return Symbol;
         }
     }
 }

src/UglyToad.PdfPig/Graphics/Operations/TextObjects/BeginText.cs

@@ -4,6 +4,9 @@
     using Content;
     using PdfPig.Core;
 
+    /// <summary>
+    /// Begin a text object, initializing the text matrix and the text line matrix to the identity matrix. Text objects cannot be nested.
+    /// </summary>
     internal class BeginText : IGraphicsStateOperation
     {
         public const string Symbol = "BT";

src/UglyToad.PdfPig/Graphics/Operations/TextObjects/EndText.cs

@@ -4,6 +4,9 @@
     using Content;
     using PdfPig.Core;
 
+    /// <summary>
+    /// End a text object, discarding the text matrix.
+    /// </summary>
     internal class EndText : IGraphicsStateOperation
     {
         public const string Symbol = "ET";

src/UglyToad.PdfPig/Graphics/Operations/TextPositioning/MoveToNextLine.cs

@@ -30,7 +30,8 @@
 
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
         public override string ToString()

src/UglyToad.PdfPig/Graphics/Operations/TextPositioning/MoveToNextLineWithOffsetSetLeading.cs

@@ -4,6 +4,10 @@
     using Content;
     using TextState;
 
+    /// <summary>
+    /// Move to the start of the next line, offset from the start of the current line by (tx, ty).
+    /// This operator also sets the leading parameter in the text state.
+    /// </summary>
     internal class MoveToNextLineWithOffsetSetLeading : IGraphicsStateOperation
     {
         public const string Symbol = "TD";
@@ -33,7 +37,12 @@
 
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteDecimal(Tx);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(Ty);
+            stream.WriteWhiteSpace();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
         public override string ToString()

src/UglyToad.PdfPig/Graphics/Operations/TextPositioning/SetTextMatrix.cs

@@ -5,6 +5,9 @@
     using Content;
     using PdfPig.Core;
 
+    /// <summary>
+    /// Set the text matrix and the text line matrix.
+    /// </summary>
     internal class SetTextMatrix : IGraphicsStateOperation
     {
         public const string Symbol = "Tm";
@@ -33,7 +36,20 @@
 
         public void Write(Stream stream)
         {
-            throw new NotImplementedException();
+            stream.WriteDecimal(Value[0]);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(Value[1]);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(Value[2]);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(Value[3]);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(Value[4]);
+            stream.WriteWhiteSpace();
+            stream.WriteDecimal(Value[5]);
+            stream.WriteWhiteSpace();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
         public override string ToString()

src/UglyToad.PdfPig/Graphics/Operations/TextState/SetCharacterSpacing.cs

@@ -3,6 +3,10 @@
     using System.IO;
     using Content;
 
+    /// <summary>
+    /// Set the character spacing to a number expressed in unscaled text space units.
+    /// Initial value: 0. 
+    /// </summary>
     internal class SetCharacterSpacing : IGraphicsStateOperation
     {
         public const string Symbol = "Tc";
@@ -25,7 +29,10 @@
 
         public void Write(Stream stream)
         {
-            throw new System.NotImplementedException();
+            stream.WriteDecimal(Spacing);
+            stream.WriteWhiteSpace();
+            stream.WriteText(Symbol);
+            stream.WriteNewLine();
         }
 
         public override string ToString()

src/UglyToad.PdfPig/Writer/TrueTypeWritingFont.cs

@@ -165,7 +165,7 @@
 
                     if (!font.TryGetBoundingAdvancedWidth(characterCode, out var width))
                     {
-                        throw new InvalidFontFormatException($"Could not find advanced with for character named '{pair.Value}' with character code: {characterCode}.");
+                        width = font.TableRegister.HorizontalMetricsTable.AdvancedWidths[0];
                     }
 
                     widths[pair.Key - firstCharacter] = new NumericToken(width * scaling);