[longomatch] Implement correctly context saving and scalling

[Andoni Morales Alastruey <amorales src gnome org>]

commit 43a9f1a1543b75199717609e68385fce6ab3e291
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Tue Jun 17 21:20:03 2014 +0200

    Implement correctly context saving and scalling

 LongoMatch.Drawing.Cairo/CairoBackend.cs |   60 +++++++++++++++++++-----------
 1 files changed, 38 insertions(+), 22 deletions(-)
---
diff --git a/LongoMatch.Drawing.Cairo/CairoBackend.cs b/LongoMatch.Drawing.Cairo/CairoBackend.cs
index 860906f..6adc8bf 100644
--- a/LongoMatch.Drawing.Cairo/CairoBackend.cs
+++ b/LongoMatch.Drawing.Cairo/CairoBackend.cs
@@ -34,14 +34,14 @@ namespace LongoMatch.Drawing.Cairo
        public class CairoBackend: IDrawingToolkit
        {
                Context context;
-               Color strokeColor;
-               Color fillColor;
-               FontSlant fSlant;
-               FontWeight fWeight;
+               Color savedStrokeColor, savedFillColor;
+               FontSlant fSlant, savedFSlant;
+               FontWeight fWeight, savedFWeight;
+               int savedLineWidth, savedFontSize;
+               string savedFontFamily;
                
                public CairoBackend ()
                {
-                       Translation = new Point (0, 0);
                        StrokeColor = Color.Black;
                        FillColor = Color.Black;
                        LineWidth = 2;
@@ -62,21 +62,14 @@ namespace LongoMatch.Drawing.Cairo
                        protected get;
                }
                
-               public Point Translation {
+               public Color StrokeColor {
                        set;
                        protected get;
                }
                
-               public Color StrokeColor {
-                       set {
-                               strokeColor = value;
-                       }
-               }
-               
                public Color FillColor {
-                       set {
-                               fillColor = value;
-                       }
+                       set;
+                       protected get;
                }
                
                public string FontFamily {
@@ -120,16 +113,34 @@ namespace LongoMatch.Drawing.Cairo
                }
                
                public void Begin() {
+                       savedStrokeColor = StrokeColor;
+                       savedFillColor = FillColor;
+                       savedFSlant = fSlant;
+                       savedFWeight = fWeight;
+                       savedLineWidth = LineWidth;
+                       savedFontSize = FontSize;
+                       savedFontFamily = FontFamily;
                        context.Save ();
-                       context.Translate (Translation.X, Translation.Y);
+               }
+               
+               public void TranslateAndScale (Point translation, Point scale) {
+                       context.Translate (translation.X, translation.Y);
+                       context.Scale (scale.X, scale.Y);
                }
                
                public void End() {
                        context.Restore ();
+                       StrokeColor = savedStrokeColor;
+                       FillColor = savedFillColor;
+                       fSlant = savedFSlant;
+                       fWeight = savedFWeight;
+                       LineWidth = savedLineWidth;
+                       FontSize = savedFontSize;
+                       FontFamily = savedFontFamily;
                }
                
                public void DrawLine (Point start, Point stop) {
-                       SetColor (strokeColor);
+                       SetColor (StrokeColor);
                        context.LineWidth = LineWidth;
                        context.MoveTo (start.X, start.Y);
                        context.LineTo (stop.X, stop.Y);
@@ -159,13 +170,13 @@ namespace LongoMatch.Drawing.Cairo
                                break;
                        }
                        
-                       SetColor (strokeColor);
+                       SetColor (StrokeColor);
                        context.MoveTo (x1, y1);
                        context.LineTo (x2, y2);
                        context.LineTo (x3, y3);
                        context.ClosePath();
                        context.StrokePreserve ();
-                       SetColor (fillColor);
+                       SetColor (FillColor);
                        context.Fill();
                }
                
@@ -229,7 +240,7 @@ namespace LongoMatch.Drawing.Cairo
                        FontExtents fextents;
                        double x, y;
                        
-                       SetColor (strokeColor);
+                       SetColor (StrokeColor);
                        context.SelectFontFace (FontFamily, fSlant, fWeight);
                        context.SetFontSize (FontSize);
                        extents = context.TextExtents (text);
@@ -240,6 +251,11 @@ namespace LongoMatch.Drawing.Cairo
                        context.ShowText (text);
                }
                
+               public void DrawImage (Image image) {
+                       CairoHelper.SetSourcePixbuf (context, image.Value, 0, 0);
+                       context.Paint ();
+               }
+
                public void DrawImage (Point start, double width, double height, Image image, bool scale) {
                        double scaleX, scaleY;
                        Point offset;
@@ -266,9 +282,9 @@ namespace LongoMatch.Drawing.Cairo
                        context.LineCap = LineCap.Round;
                        context.LineJoin = LineJoin.Round;
                        context.LineWidth = LineWidth;
-                       SetColor (strokeColor);
+                       SetColor (StrokeColor);
                        context.StrokePreserve();
-                       SetColor (fillColor);
+                       SetColor (FillColor);
                        context.Fill();
                }