add qr code rendering

README.md

 
 and go from there.
 
+## Dependencies
+
+You always need
+
+    pip install pil
+    pip install bdfparser
+    pip install "qrcode[pil]"
+
+The rest depends on the output device chosen.
+
 ## Licensing
 
 This project is licensed as beer-ware:

camp_small.py

     from life import GameOfLife
     from net import CheckHTTP
     from image import ImageScreen
+    from qr import QRScreen
     from manager import Manager
 
+    url = "http://ubabot.frubar.net"
+
     import util
     t = util.getTarget()
 
     t.loop_end()
 
     success = Manager(t)
-    success.add(ImageScreen(t, "drinka.gif", 0.2, 3, 20.0))
+    success.add(ImageScreen(t, "drinka.gif", 0.2, 2, 20.0))
+    success.add(Solid(t, 1.0))
+    success.add(QRScreen(t, url, 30.0))
     success.add(Solid(t, 1.0))
 
     fail = Manager(t)
     fail.add(GameOfLife(t, 20, (0, 255, 0), (0, 0, 0), None, 2.0))
     fail.add(Solid(t, 2.0))
 
-    d = CheckHTTP("http://ubabot.frubar.net")
+    d = CheckHTTP(url)
     d.success(success)
     d.fail(fail)
 

qr.py

+#!/usr/bin/env python3
+
+# ----------------------------------------------------------------------------
+# "THE BEER-WARE LICENSE" (Revision 42):
+# <xythobuz@xythobuz.de> wrote this file.  As long as you retain this notice
+# you can do whatever you want with this stuff. If we meet some day, and you
+# think this stuff is worth it, you can buy me a beer in return.   Thomas Buck
+# ----------------------------------------------------------------------------
+
+import time
+import qrcode
+import util
+
+class QRScreen:
+    def __init__(self, g, d, t = 10.0, c1 = (0, 0, 0), c2 = (255, 255, 255)):
+        self.gui = g
+        self.time = t
+        self.c1 = c1
+        self.c2 = c2
+
+        qr = qrcode.QRCode(
+            box_size = 1,
+            border = 0,
+        )
+        qr.add_data(d)
+        qr.make(fit = True)
+
+        if util.isPi():
+            # work-around for weird bug in old qrcode lib?
+            self.image = qr.make_image(fill_color = "black", back_color = "white")
+            self.c1 = (0, 0, 0)
+            self.c2 = (255, 255, 255)
+        else:
+            self.image = qr.make_image(fill_color = self.c1, back_color = self.c2)
+
+        self.xOff = int((self.gui.width - self.image.width) / 2)
+        self.yOff = int((self.gui.height - self.image.height) / 2)
+
+        self.restart()
+
+    def restart(self):
+        self.start = time.time()
+
+    def finished(self):
+        return (time.time() - self.start) >= self.time
+
+    def draw(self):
+        # fill border, if needed
+        if self.c2 != (0, 0, 0):
+            for x in range(0, self.gui.width):
+                for y in range(0, self.yOff):
+                    self.gui.set_pixel(x, y, self.c2)
+                for y in range(0, self.gui.height - self.image.height - self.yOff):
+                    self.gui.set_pixel(x, y + self.yOff + self.image.height, self.c2)
+            for y in range(0, self.image.height):
+                for x in range(0, self.xOff):
+                    self.gui.set_pixel(x, y + self.yOff, self.c2)
+                for x in range(0, self.gui.width - self.image.width - self.xOff):
+                    self.gui.set_pixel(x + self.xOff + self.image.width, y + self.yOff, self.c2)
+
+        for x in range(0, self.image.width):
+            for y in range(0, self.image.height):
+                v = self.image.getpixel((x, y))
+                if isinstance(v, int):
+                    v = (v, v, v)
+                self.gui.set_pixel(x + self.xOff, y + self.yOff, v)
+
+if __name__ == "__main__":
+    import util
+    t = util.getTarget()
+
+    d = QRScreen(t, "Hello World")
+    t.debug_loop(d.draw)

util.py

 
 import platform
 
+def isPi():
+    return platform.machine() == "armv7l"
+
 def getTarget():
     t = None
-    if platform.machine() == "armv7l":
+    if isPi():
         from pi import PiMatrix
         t = PiMatrix()
     else: