# HG changeset patch
# User Simon Cross <hodgestar@gmail.com>
# Date 1252086577 0
# Node ID f06010d34cd3fa2d9bc041c6403b71c7676ea1af
# Parent  cef972d285f77adbf564020c341645c1d211c84b
Add sprite cursors for building placement.

diff -r cef972d285f7 -r f06010d34cd3 gamelib/gameboard.py
--- a/gamelib/gameboard.py	Fri Sep 04 17:39:29 2009 +0000
+++ b/gamelib/gameboard.py	Fri Sep 04 17:49:37 2009 +0000
@@ -1,7 +1,7 @@
 import random
 
 import pygame
-from pygame.locals import MOUSEBUTTONDOWN, KEYDOWN, K_UP, K_DOWN, K_LEFT, K_RIGHT
+from pygame.locals import MOUSEBUTTONDOWN, MOUSEMOTION, KEYDOWN, K_UP, K_DOWN, K_LEFT, K_RIGHT
 from pgu import gui
 
 import data
@@ -13,6 +13,7 @@
 import equipment
 import sound
 import cursors
+import sprite_cursor
 
 class OpaqueLabel(gui.Label):
     def __init__(self, value, **params):
@@ -158,6 +159,8 @@
     def event(self, e):
         if e.type == MOUSEBUTTONDOWN:
             self.gameboard.use_tool(e)
+        elif e.type == MOUSEMOTION and self.gameboard.sprite_cursor:
+            self.gameboard.update_sprite_cursor(e)
 
 
 class GameBoard(object):
@@ -179,6 +182,7 @@
 
         self.selected_tool = None
         self.animal_to_place = None
+        self.sprite_cursor = None
         self.chickens = set()
         self.foxes = set()
         self.buildings = []
@@ -218,10 +222,20 @@
             pygame.mouse.set_cursor(*cursor)
         else:
             pygame.mouse.set_cursor(*cursors.cursors['arrow'])
+        if self.sprite_cursor:
+            self.tv.sprites.remove(self.sprite_cursor)
+            self.sprite_cursor = None
+        if buildings.is_building(tool):
+            self.sprite_cursor = sprite_cursor.SpriteCursor(tool.IMAGE, self.tv)
+            self.tv.sprites.append(self.sprite_cursor)
 
     def reset_cursor(self):
         pygame.mouse.set_cursor(*cursors.cursors['arrow'])
 
+    def update_sprite_cursor(self, e):
+        tile_pos = self.tv.screen_to_tile(e.pos)
+        self.sprite_cursor.set_pos(tile_pos)
+
     def in_bounds(self, pos):
         """Check if a position is within the game boundaries"""
         if pos.x < 0 or pos.y < 0:
diff -r cef972d285f7 -r f06010d34cd3 gamelib/imagecache.py
--- a/gamelib/imagecache.py	Fri Sep 04 17:39:29 2009 +0000
+++ b/gamelib/imagecache.py	Fri Sep 04 17:49:37 2009 +0000
@@ -56,7 +56,7 @@
 
 # modifiers
 
-from pygame.locals import BLEND_MULT, BLEND_ADD
+from pygame.locals import BLEND_MULT, BLEND_ADD, BLEND_RGBA_MULT
 NIGHT_COLOUR = (100.0, 100.0, 200.0, 255.0)
 DARKEN_COLOUR = (100.0, 100.0, 100.0, 255.0)
 LIGHTEN_COLOUR = (200.0, 200.0, 200.0, 225.0)
@@ -92,6 +92,11 @@
     lighten.blit(overlay, (over_x, over_y), None, BLEND_ADD)
     return lighten
 
+def sprite_cursor(image):
+    cursor = image.copy()
+    cursor.fill((255, 255, 255, 100), None, BLEND_RGBA_MULT)
+    return cursor
+
 # globals
 
 cache = ImageCache()
@@ -99,4 +104,5 @@
 cache.register_modifier("right_facing", convert_to_right_facing)
 cache.register_modifier("darken_center", darken_center)
 cache.register_modifier("lighten_most", lighten_most)
+cache.register_modifier("sprite_cursor", sprite_cursor)
 load_image = cache.load_image
diff -r cef972d285f7 -r f06010d34cd3 gamelib/sprite_cursor.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gamelib/sprite_cursor.py	Fri Sep 04 17:49:37 2009 +0000
@@ -0,0 +1,20 @@
+"""In-game sprite cursors for the gameboard.
+
+   Currently mostly used when placing buildings.
+   """
+
+import imagecache
+from pgu.vid import Sprite
+
+class SpriteCursor(Sprite):
+    """A Sprite used as an on-board cursor."""
+
+    def __init__(self, image_name, tv):
+        image = imagecache.load_image(image_name, ["sprite_cursor"])
+        # Create the sprite somewhere far off screen
+        Sprite.__init__(self, image, (-1000, -1000))
+        self._tv = tv
+
+    def set_pos(self, tile_pos):
+        """Set the cursor position on the gameboard."""
+        self.rect.x, self.rect.y = self._tv.tile_to_view(tile_pos)