Save and restore state of the game

Ability to 'save' (when the user closes the Activity) and 'restore' (when the
user launch it from the Journal or the Home without holding Alt) the state of
the game.

For this ability I had to upgrade 'olpcgames' to 1.6 because
'olpcgames.FILE_READ_REQUEST' and 'olpcgames.FILE_WRITE_REQUEST' events are
added in that version and those events are needed for this.

The data is saved (as JSON, with json module) in the 'event.metadata["state"]' and the timestamp state is saved in 'event.filename'.

This commit solves ticket #2393:
 * http://bugs.sugarlabs.org/ticket/2393

Signed-off-by: Manuel Kaufmann <humitos@gmail.com>
Signed-off-by: Rafael Ortiz <rafael@activitycentral.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/olpcgames/textsprite.py b/olpcgames/textsprite.py
new file mode 100644
index 0000000..7663630
--- /dev/null
+++ b/olpcgames/textsprite.py
@@ -0,0 +1,40 @@
+"""Simple Sprite sub-class that renders via a PangoFont"""
+from pygame import sprite 
+from olpcgames import pangofont
+
+class TextSprite( sprite.Sprite ):
+    """Sprite with a simple text renderer"""
+    image = rect = text = color = background = None
+    def __init__( self, text=None, family=None, size=None, bold=False, italic=False, color=None, background=None ):
+        super( TextSprite, self ).__init__( )
+        self.font = pangofont.PangoFont( family=family, size=size, bold=bold, italic=italic )
+        self.set_color( color )
+        self.set_background( background )
+        self.set_text( text )
+    def set_text( self, text ):
+        """Set our text string and render to a graphic"""
+        self.text = text 
+        self.render( )
+    def set_color( self, color =None):
+        """Set our rendering colour (default white)"""
+        self.color = color or (255,255,255)
+        self.render()
+    def set_background( self, color=None ):
+        """Set our background color, default transparent"""
+        self.background = color 
+        self.render()
+    def render( self ):
+        """Render our image and rect (or None,None)
+        
+        After a render you will need to move the rect member to the 
+        correct location on the screen.
+        """
+        if self.text:
+            self.image = self.font.render( self.text, color = self.color, background = self.background )
+            currentRect = self.rect
+            self.rect = self.image.get_rect()
+            if currentRect:
+                self.rect.center = currentRect.center 
+        else:
+            self.rect = None 
+            self.image = None