From b044459fc1d1a370eb48e38c2e45dca714955db0 Mon Sep 17 00:00:00 2001
From: Tebjan Halm <tebjan@vvvv.org>
Date: Sat, 24 Dec 2011 04:53:56 +0100
Subject: [PATCH] * correct text alignment on base line

* added precise MeasureString method
---
 Source/SvgRenderer.cs        | 15 +++++++++++++++
 Source/Text/SvgText.cs       | 12 ++++++------
 Source/Text/SvgTextAnchor.cs |  2 ++
 3 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/Source/SvgRenderer.cs b/Source/SvgRenderer.cs
index 7af50e5..efe4187 100644
--- a/Source/SvgRenderer.cs
+++ b/Source/SvgRenderer.cs
@@ -132,5 +132,20 @@ namespace Svg
         {
             this._innerGraphics.Dispose();
         }
+        
+        public SizeF MeasureString(string text, Font font)
+        {
+        	var ff = font.FontFamily;
+        	float lineSpace = ff.GetLineSpacing(font.Style);
+        	float ascent = ff.GetCellAscent(font.Style);
+        	float baseline =  font.GetHeight(this._innerGraphics) * ascent / lineSpace;
+        	
+        	StringFormat format = StringFormat.GenericTypographic;
+        	format.SetMeasurableCharacterRanges(new CharacterRange[]{new CharacterRange(0, text.Length)});
+        	Region[] r = this._innerGraphics.MeasureCharacterRanges(text, font, new Rectangle(0, 0, 1000, 1000), format);
+        	RectangleF rect = r[0].GetBounds(this._innerGraphics);
+        	
+        	return new SizeF(rect.Width, baseline);
+        }
     }
 }
\ No newline at end of file
diff --git a/Source/Text/SvgText.cs b/Source/Text/SvgText.cs
index e0be0c1..c860cf7 100644
--- a/Source/Text/SvgText.cs
+++ b/Source/Text/SvgText.cs
@@ -191,6 +191,7 @@ namespace Svg
         {
             GraphicsPath p = new GraphicsPath();
             p.AddString(text, font.FontFamily, 0, font.Size, new PointF(0.0f, 0.0f), StringFormat.GenericTypographic);
+            
             p.Transform(renderer.Transform);
             return p.GetBounds();
         }
@@ -211,23 +212,22 @@ namespace Svg
                     {
                         fontSize = 1.0f;
                     }
-                    RectangleF stringBounds;
+
                     PointF location = PointF.Empty;
                     Font font = new Font(this._fontFamily, fontSize, FontStyle.Regular, GraphicsUnit.Pixel);
+                    SizeF stringBounds = _stringMeasure.MeasureString(this.Text, font);
 
                     // Minus FontSize because the x/y coords mark the bottom left, not bottom top.
                     switch (this.TextAnchor)
                     {
                         case SvgTextAnchor.Start:
-                            location = new PointF(this.X.ToDeviceValue(this), this.Y.ToDeviceValue(this, true) - this._fontSize);
+                            location = new PointF(this.X.ToDeviceValue(this), this.Y.ToDeviceValue(this, true) - stringBounds.Height);
                             break;
                         case SvgTextAnchor.Middle:
-                            stringBounds = SvgText.MeasureString(_stringMeasure, this.Text, font);
-                            location = new PointF(this.X.ToDeviceValue(this) - (stringBounds.Width / 2), this.Y.ToDeviceValue(this, true) - this._fontSize);
+                            location = new PointF(this.X.ToDeviceValue(this) - (stringBounds.Width / 2), this.Y.ToDeviceValue(this, true) - stringBounds.Height);
                             break;
                         case SvgTextAnchor.End:
-                            stringBounds = SvgText.MeasureString(_stringMeasure, this.Text, font);
-                            location = new PointF(this.X.ToDeviceValue(this) - stringBounds.Width, this.Y.ToDeviceValue(this, true) - this._fontSize);
+                            location = new PointF(this.X.ToDeviceValue(this) - stringBounds.Width, this.Y.ToDeviceValue(this, true) - stringBounds.Height);
                             break;
                     }
 
diff --git a/Source/Text/SvgTextAnchor.cs b/Source/Text/SvgTextAnchor.cs
index 55f7236..207bf95 100644
--- a/Source/Text/SvgTextAnchor.cs
+++ b/Source/Text/SvgTextAnchor.cs
@@ -2,12 +2,14 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using System.ComponentModel;
 
 namespace Svg
 {
     /// <summary>
     /// Text anchor is used to align (start-, middle- or end-alignment) a string of text relative to a given point.
     /// </summary>
+    [TypeConverter(typeof(SvgTextAnchorConverter))]
     public enum SvgTextAnchor
     {
         /// <summary>
-- 
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