Changeset 226 for trunk/src/pyspacewar/ui.py

Timestamp:

12/25/06 18:55:40 (5 years ago)

Author:

mg

Message:

Fade in a "Paused" message when you press Pause.

Files:

• trunk/src/pyspacewar/ui.py (modified) (6 diffs)

trunk/src/pyspacewar/ui.py

@@ -10 +10 @@
 import glob
 import time
+import math
 import random
 import itertools
@@ -168 +169 @@
     beta = 1-alpha
     return (int(alpha*r1+beta*r2), int(alpha*g1+beta*g2), int(alpha*b1+beta*b2))
+
+
+def smooth(x, xmax, y1, y2):
+    """Calculate a smooth transition from y1 to y2 as x moves from 0 to xmax.
+
+        >>> for x in range(10):
+        ...     print '*' * int(smooth(x, 9, 1, 10))
+        *
+        *
+        *
+        **
+        ****
+        ******
+        ********
+        *********
+        *********
+        *********
+
+    """
+    t = -5 + 10 * (float(x) / xmax)
+    value = 1 / (1 + math.exp(-t))
+    return y1 + (y2 - y1) * value
+
 
 
@@ -1002 +1026 @@
     fg_color = (220, 255, 255)
     bg_color = (24, 120, 14)
+    alpha = int(255 * 0.9)
 
     def __init__(self, font, text, xpadding=16, ypadding=16, xalign=0.5,
@@ -1014 +1039 @@
         self.text = text
         self.surface = pygame.Surface((self.width, self.height))
-        self.surface.set_alpha(255 * 0.9)
         self.surface.set_colorkey((1, 1, 1))
         self.surface.fill(self.bg_color)
@@ -1030 +1054 @@
         """Draw the element."""
         x, y = self.position(surface)
+        self.surface.set_alpha(self.alpha)
         surface.blit(self.surface, (x, y))
 
@@ -1146 +1171 @@
     paused = True
 
+    show_message_after = 1 # seconds
+    fade_in_time = 5 # seconds
+
+    def enter(self, prev_mode):
+        """Enter the mode."""
+        UIMode.enter(self, prev_mode)
+        self.message = None
+        self.pause_entered = time.time()
+        self.animate = self.wait_for_fade
+
     def draw(self, screen):
         """Draw extra things pertaining to the mode."""
         self.prev_mode.draw(screen)
+        if self.animate:
+            self.animate()
+        if self.message:
+            self.message.draw(screen)
+
+    def wait_for_fade(self):
+        if time.time() >= self.pause_entered + self.show_message_after:
+            self.message = HUDMessage(self.ui.menu_font, "Paused")
+            self.message.alpha = 0
+            self.animate = self.fade_in
+
+    def fade_in(self):
+        t = time.time() - self.pause_entered - self.show_message_after
+        if t > self.fade_in_time:
+            self.message.alpha = int(255 * 0.9)
+            self.animate = None
+        else:
+            self.message.alpha = int(smooth(t, self.fade_in_time, 0, 255 * 0.9))
 
     def handle_any_other_key(self, event):