[gcompris] Add different difficulties to mining activity

[Bruno Coudoin <bcoudoin src gnome org>]

commit 541cfeda916085591fe761693a96693fba3385e7
Author: Peter Albrecht <pa-dev gmx de>
Date:   Sat Sep 15 17:58:14 2012 +0200

    Add different difficulties to mining activity
    
    The maximum zoom depth and the number of mousewheel turns to reach it are
    now set according to the current acitivity level.
    In general: The higher the level, the deeper the user has to zoom in and
    the more mousewheel turns are needed.
    
    Also the number of nuggets to collect, is increased each level.

 src/mining-activity/mining.py |   47 ++++++++++++++++++++++++++++++++--------
 1 files changed, 37 insertions(+), 10 deletions(-)
---
diff --git a/src/mining-activity/mining.py b/src/mining-activity/mining.py
index 9670e62..5748dd9 100644
--- a/src/mining-activity/mining.py
+++ b/src/mining-activity/mining.py
@@ -76,7 +76,7 @@ class Gcompris_mining:
 
     print "mining start"
 
-    self.gcomprisBoard.maxlevel = 9
+    self.gcomprisBoard.maxlevel = 3
     self.gcomprisBoard.sublevel = 1
     self.gcomprisBoard.number_of_sublevel = 1
 
@@ -138,18 +138,26 @@ class Gcompris_mining:
     gcompris.bar_set_level(self.gcomprisBoard);
 
     # load level specific values
-    self.nuggets_to_collect = 3
+    if level == 1:
+      self.nuggets_to_collect = 3
+
+    elif level == 2:
+      self.nuggets_to_collect = 6
+
+    elif level == 3:
+      self.nuggets_to_collect = 9
+
+    else:
+      print("Warning: No level specific values defined for level %i! Keeping current settings." % level)
+
 
     # prepare new game
     self.is_game_won = False
     self.nugget_count = 0
     self.need_new_nugget = False
 
-    # TODO: set level-function:
-    #  perhaps different backgrounds?
-
     self.update_lorry()
-    self.viewport.reset()
+    self.viewport.reset(level)
 
     self.placer.add_blocker(self.gc_bar_blocker)
     self.placer.add_blocker(self.lorry)
@@ -506,10 +514,12 @@ class Viewport:
 
   # The limit to max zoom in.
   # Try to keep scale_max reachable by  scale_min * zoom_factor ^ n  (with n in [1, 2, 3, 4, ...[)
-  scale_max = 0.9520
+  # This value is set up in reset()
+  scale_max = None
 
   # the factor to zoom on each zoom event
-  zoom_factor = 1.3
+  # This value is set up in reset()
+  zoom_factor = None
 
 
   # The GooCanvas group, which holds everything that is affected by zooming
@@ -541,8 +551,25 @@ class Viewport:
     )
 
 
-  def reset(self):
-    """ Reset the viewport """
+  def reset(self, level):
+    """ Reset the viewport and set zooming parameters according to current level """
+
+    # in general: higher level means more zooming
+    if level == 1:
+      self.scale_max = 0.6000
+      self.zoom_factor = 1.3417  # 2 zoom events from min to max
+
+    elif level == 2:
+      self.scale_max = 0.8000
+      self.zoom_factor = 1.2447  # 4 zoom events from min to max
+
+    elif level == 3:
+      self.scale_max = 1.0000
+      self.zoom_factor = 1.2010  # 6 zoom events from min to max
+
+    else:
+      print("Warning: No level specific zooming values defined for level %i! Keeping current settings." % level)
+
 
     # zoom out max
     self.scale = self.scale_min