dxf: Fixed multiline string rendering

inabox.dxf/DrawData.cs

@@ -318,7 +318,7 @@ public class GdiGraphics : IGraphics
         Graphics.FillEllipse(new SolidBrush(color), point.X - thickness / 2, point.Y - thickness / 2, point.X + thickness / 2, point.Y + thickness / 2);
     }
 
-    private void TransformText(string text, Font font, PointF position, float rotation, TextFormat format)
+    private void TransformTextVertical(string text, Font font, PointF position, float rotation, TextFormat format)
     {
         DrawData.Translate(position);
         DrawData.Rotate(rotation);
@@ -350,18 +350,6 @@ public class GdiGraphics : IGraphics
                 DrawData.Translate(new PointF(0, -baseline + font.FontFamily.GetCellAscent(font.Style) * ratio));
                 break;
         }
-
-        switch (format.Alignment)
-        {
-            case TextAlignment.Left:
-                break;
-            case TextAlignment.Center:
-                DrawData.Translate(new PointF(-(float)size.Width / 2, 0));
-                break;
-            case TextAlignment.Right:
-                DrawData.Translate(new PointF(-(float)size.Width, 0));
-                break;
-        }
     }
 
     public void DrawText(string text, Color color, PointF position, float rotation, TextFormat format)
@@ -371,9 +359,32 @@ public class GdiGraphics : IGraphics
             return;
         }
         DrawData.PushTransform();
-        TransformText(text, Font, position, rotation, format);
+        TransformTextVertical(text, Font, position, rotation, format);
 
-        Graphics.DrawString(text, Font, new SolidBrush(color), new PointF(0, 0), StringFormat.GenericTypographic);
+        var pos = 0;
+        foreach(var line in text.Split(new char[] { '\n', '\r' }, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
+        {
+            DrawData.PushTransform();
+            DrawData.Translate(0, pos * Font.Height);
+            var size = Graphics.MeasureString(line, Font);
+
+            switch (format.Alignment)
+            {
+                case TextAlignment.Left:
+                    break;
+                case TextAlignment.Center:
+                    DrawData.Translate(new PointF(-(float)size.Width / 2, 0));
+                    break;
+                case TextAlignment.Right:
+                    DrawData.Translate(new PointF(-(float)size.Width, 0));
+                    break;
+            }
+
+            Graphics.DrawString(line, Font, new SolidBrush(color), new PointF(0, 0), StringFormat.GenericTypographic);
+            DrawData.PopTransform();
+
+            ++pos;
+        }
 
         DrawData.PopTransform();
     }