add SD card test and fix middlebutton press

Author: ladyada

code.py

@@ -1,11 +1,21 @@
+import adafruit_sdcard
+import storage
 from pyoa_graphics import PYOA_Graphics
+import board
+import digitalio
 
-
+try:
+    sdcard = adafruit_sdcard.SDCard(board.SPI(), digitalio.DigitalInOut(board.SD_CS))
+    vfs = storage.VfsFat(sdcard)
+    storage.mount(vfs, "/sd")
+    print("SD card found") # no biggie
+except OSError:
+    print("No SD card found") # no biggie
 
 gfx = PYOA_Graphics()
 
-gfx.load_game("/Adafruit_CircuitPython_PYOA/robots")
-current_card = 2   # start with first card
+gfx.load_game("/sd/robots")
+current_card = 0   # start with first card
 
 while True:
     print("Current card:", current_card)

pyoa_graphics.py

@@ -132,12 +132,18 @@ def display_card(self, card_num):
             p = self.ts.touch_point
             if p:
                 print("touch: ", p)
-                if self._left_button.contains(p):
-                    print("Left button")
-                    goto_page = card.get('button01_goto_page_id', None)
-                if self._right_button.contains(p):
-                    print("Right button")
-                    goto_page = card.get('button02_goto_page_id', None)
+                if button01_text and not button02_text:
+                    # showing only middle button
+                    if self._middle_button.contains(p):
+                        print("Middle button")
+                        goto_page = card.get('button01_goto_page_id', None)
+                if button01_text and button02_text:
+                    if self._left_button.contains(p):
+                        print("Left button")
+                        goto_page = card.get('button01_goto_page_id', None)
+                    if self._right_button.contains(p):
+                        print("Right button")
+                        goto_page = card.get('button02_goto_page_id', None)
         self.play_sound(None)  # stop playing any sounds
         for i, c in enumerate(self._game):
             if c.get('page_id', None) == goto_page: