Working out some scrolling text and handling of user-entered strings

Added the LetterSpool class to handle the current "set" of user-entered
words

ty.py

@@ -1,21 +1,55 @@
 #!/usr/bin/env python
 
+import logging
+import os
 import sys
 import random
 
 import pygame
 from pygame.locals import *
 
-class ExitException(Exception):
-    pass
+from typy import words
+
+if os.environ.get('DEBUG'):
+    logging.basicConfig(level=logging.DEBUG)
+
+class LetterSpool(object):
+    spooled = None
+    parent = None
+    font = None
+    clear_keys = (K_RETURN, K_SPACE,)
+    color = (255, 255, 255,)
+
+    def __init__(self, parent, **kwargs):
+        self.parent = parent
+        self.font = pygame.font.SysFont('Courier', 32)
+        self.spooled = []
+
+    def clear(self):
+        logging.debug('LetterSpool.clear()')
+        self.spooled = []
+
+    def handle_key(self, event):
+        if event.key in self.clear_keys:
+            self.clear()
+            return
+        if event.key == K_BACKSPACE:
+            self.spooled = self.spooled[:-1]
+        else:
+            self.spooled.append(event.unicode)
+        self.parent.blit(self.font.render(''.join(self.spooled), 0, self.color),
+                (0,0,))
+
 
 class Typy(object):
     surface = None
     size = None
     clock = None
-    tick = 30
+    tick = 15
     background_music = False
     font = None
+    spool = None
+    current_letters = None
 
     def __init__(self, width, height, **kwargs):
         self.size = width, height
@@ -28,6 +62,7 @@ class Typy(object):
         pygame.mouse.set_visible(False)
 
         self.font = pygame.font.SysFont('Courier', 48)
+        self.spool = LetterSpool(self.surface)
 
     def should_exit(self, event):
         if event.type == QUIT:
@@ -42,19 +77,33 @@ class Typy(object):
             return False
         if event.type == KEYDOWN:
             self.surface.fill((0, 0, 0))
-            self.surface.blit(self.font.render(event.unicode, 0, (255,255,255)),
-                    (0,0))
+            self.spool.handle_key(event)
         print ('handle_event', event)
         return True
 
     def runloop(self):
+        run = True
         if self.background_music:
             pygame.mixer.music.load('background.mid')
             pygame.mixer.music.play(-1, 0.0)
-        run = True
+
+        word_x = 480
+        step = 0.05
+        text = 'hello'
+        word = self.font.render(text, 0, (255,255,255))
+        f_w, f_h = self.font.size(text)
+        off_screen = len(text) * f_w
         while run:
             for event in pygame.event.get():
                 run = self.handle_event(event)
+
+            if word_x >= -off_screen:
+                # Rect(left, top, width, height)
+                self.surface.fill((0,0,0), 
+                        rect=pygame.Rect(word_x, 100, f_w, f_h))
+                self.surface.blit(word, (word_x, 100))
+                word_x = word_x - step
+
             pygame.display.update()
         pygame.mixer.music.stop()
 

typy/__init__.py

@@ -0,0 +1,2 @@
+#!/usr/bin/env python
+

typy/words.py

@@ -0,0 +1,4 @@
+#!/usr/bin/env python
+
+def words():
+    return 'four score and seven years ago'.split(' ')