updated LEDBackpack with my scrolling text modifications

Author: cameraready

Adafruit_LEDBackpack/Adafruit_8x8.py

@@ -1,55 +1,80 @@
 #!/usr/bin/python
+# Updated to allow for scrolling text with the Adafruit_GFX.py library
+# ColorEightByEight not updated yet.
 
-import time
-import datetime
 from Adafruit_LEDBackpack import LEDBackpack
 
 # ===========================================================================
 # 8x8 Pixel Display
 # ===========================================================================
 
-class EightByEight:
-  disp = None
+class EightByEight(LEDBackpack):
+  #disp = None
+  rotation = None
 
   # Constructor
   def __init__(self, address=0x70, debug=False):
     if (debug):
       print "Initializing a new instance of LEDBackpack at 0x%02X" % address
-    self.disp = LEDBackpack(address=address, debug=debug)
+    LEDBackpack.__init__(self, 8, 8, address, debug)
+    self.rotation = 0
 
   def writeRowRaw(self, charNumber, value):
-    "Sets a row of pixels using a raw 16-bit value"
+    #"Sets a row of pixels using a raw 16-bit value"
     if (charNumber > 7):
       return
     # Set the appropriate row
-    self.disp.setBufferRow(charNumber, value)
+    self.setBufferRow(charNumber, value)
 
   def clearPixel(self, x, y):
-    "A wrapper function to clear pixels (purely cosmetic)"
+    #"A wrapper function to clear pixels (purely cosmetic)"
     self.setPixel(x, y, 0)
 
-  def setPixel(self, x, y, color=1):
-    "Sets a single pixel"
-    if (x >= 8):
+  def drawPixel(self, x, y, color=1):
+    #"Sets a single pixel"
+    if ((y < 0) or (y >= 8)):
       return
-    if (y >= 8):
+    if ((x < 0) or (x >= 8)):
       return    
+      
+    # Added rotation code 4/16/13 - RH
+    if self.rotation == 1:
+      x, y = self.swap(x, y)
+      x = 8 - x - 1
+    elif self.rotation == 2:
+      x = 8 - x - 1
+      y = 8 - y - 1
+    elif self.rotation == 3:
+      x, y = self.swap(x, y)
+      y = 8 - y - 1
+
     x += 7   # ATTN: This might be a bug?  On the color matrix, this causes x=0 to draw on the last line instead of the first.
     x %= 8
     # Set the appropriate pixel
-    buffer = self.disp.getBuffer()
+    buffer = self.getBuffer()
     if (color):
-      self.disp.setBufferRow(y, buffer[y] | 1 << x)
-    else:
-      self.disp.setBufferRow(y, buffer[y] & ~(1 << x))
+      self.setBufferRow(y, buffer[y] | 1 << x, False)    # disable update option to determine if writeDisplay() is called when 
+    else:                                                # writing a bunch of pixels. Speeds things up dramatically when scrolling 
+      self.setBufferRow(y, buffer[y] & ~(1 << x), False) # text on multiple matrices. Call writeDisplay() after updating buffer.
+      
+  # Used to rotate display 4/16/13 - RH
+  # Corrected for dual output 6/5/13 - RH
+  def swap(self, x, y):
+      temp = x
+      x = y
+      y = temp
+      return (x, y)
 
-  def clear(self):
-    "Clears the entire display"
-    self.disp.clear()
+  # Added 6/3/13 - RH    
+  def printMessage(self, text):
+      for letter in range(0, len(text)):
+        self.write(text[letter])
+        if (self.debug):
+            print(text[letter])
 
 class ColorEightByEight(EightByEight):
   def setPixel(self, x, y, color=1):
-    "Sets a single pixel"
+    #"Sets a single pixel"
     if (x >= 8):
       return
     if (y >= 8):