[gcompris] In the submarine activity, we now destroy and reset the frigate motion when we enter the help.

[Bruno Coudoin <bcoudoin src gnome org>]

commit ca14c4b9afd6bccac6cb5234a9572b3a0129d19d
Author: Bruno Coudoin <bruno coudoin free fr>
Date:   Mon Feb 28 22:29:21 2011 +0100

    In the submarine activity, we now destroy and reset the frigate motion when we enter the help.
    
    Not doing so makes the children loose the game while reading the manual.

 src/submarine-activity/submarine.c |   71 +++++++++++++++++++++++++-----------
 1 files changed, 49 insertions(+), 22 deletions(-)
---
diff --git a/src/submarine-activity/submarine.c b/src/submarine-activity/submarine.c
index 83b1cc2..b799d60 100644
--- a/src/submarine-activity/submarine.c
+++ b/src/submarine-activity/submarine.c
@@ -148,8 +148,9 @@ static GooCanvasItem *barre_av_item, *barre_ar_item,
   *ballast_ar_air_item_back, *ballast_ar_air_item_front,
   *ballast_av_air_item_rect, *ballast_ar_air_item_rect,
   *air_compressor_item, *battery_charger_item, *alert_submarine,
-  *bubbling[3], *frigate_item, *big_explosion, *whale, *treasure, *top_gate_item;
+  *bubbling[3], *big_explosion, *whale, *treasure, *top_gate_item;
 
+static GooCanvasItem *frigate_item = NULL;
 /* submarine parameters */
 static gdouble barre_av_angle, barre_ar_angle, depth, weight, resulting_weight;
 static gdouble submarine_x, air, battery, regleur;
@@ -196,6 +197,8 @@ static gboolean air_compressor_event(GooCanvasItem *item, GooCanvas *target,
 static gboolean battery_charger_event(GooCanvasItem *item, GooCanvas *target,
 				  GdkEventButton *event, gpointer data);
 
+static void start_frigate_anim(void);
+static void stop_frigate_anim(void);
 static void setSpeed(gdouble value);
 static void setBattery(gdouble value);
 static void setAir(gdouble value);
@@ -251,6 +254,13 @@ static void pause_board (gboolean pause)
 
   if(gamewon == TRUE && pause == FALSE) /* the game is won */
     game_won();
+  else
+    {
+      if(pause == TRUE)
+	stop_frigate_anim();
+      else
+	start_frigate_anim();
+    }
 
   board_paused = pause;
 }
@@ -774,27 +784,6 @@ static GooCanvasItem *submarine_create_item(GooCanvasItem *parent) {
   g_signal_connect(battery_charger_item, "button-press-event",
 		   (GtkSignalFunc) battery_charger_event, NULL);
 
-  // the antisubmarine warfare frigate
-  pixmap = gc_pixmap_load("submarine/asw_frigate.png");
-  w = gdk_pixbuf_get_width(pixmap);
-  frigate_item = goo_canvas_image_new (boardRootItem,
-				       pixmap,
-				       0,
-				       0,
-				       NULL);
-  goo_canvas_item_translate(frigate_item, BOARDWIDTH, 2);
-  goo_canvas_item_animate(frigate_item,
-			  -w,
-			  2.0,
-			  1,
-			  0,
-			  TRUE,
-			  30*1000,
-			  40,
-			  GOO_CANVAS_ANIMATE_RESTART);
-  gdk_pixbuf_unref(pixmap);
-
-
   /*
    * Set the right wall
    * ------------------
@@ -845,6 +834,44 @@ static GooCanvasItem *submarine_create_item(GooCanvasItem *parent) {
 
   return NULL;
 }
+
+static void start_frigate_anim()
+{
+  GdkPixbuf *pixmap;
+  int w;
+
+  // the antisubmarine warfare frigate
+  pixmap = gc_pixmap_load("submarine/asw_frigate.png");
+  w = gdk_pixbuf_get_width(pixmap);
+
+  frigate_item = goo_canvas_image_new (boardRootItem,
+				       pixmap,
+				       0,
+				       0,
+				       NULL);
+  goo_canvas_item_translate(frigate_item, BOARDWIDTH, 2);
+  goo_canvas_item_animate(frigate_item,
+			  -w,
+			  2.0,
+			  1,
+			  0,
+			  TRUE,
+			  30*1000,
+			  40,
+			  GOO_CANVAS_ANIMATE_RESTART);
+  gdk_pixbuf_unref(pixmap);
+}
+
+static void stop_frigate_anim()
+{
+  if (frigate_item)
+    {
+      goo_canvas_item_stop_animation (frigate_item);
+      goo_canvas_item_remove(frigate_item);
+    }
+  frigate_item = NULL;
+}
+
 /* =====================================================================
  * Periodically recalculate the submarine parameters
  * =====================================================================*/