Add bitmap demos.

gui/demos/bitmap.py

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+# bitmap.py Minimal micro-gui demo.
+
+# Released under the MIT License (MIT). See LICENSE.
+# Copyright (c) 2022 Peter Hinch
+
+# hardware_setup must be imported before other modules because of RAM use.
+import gc
+import uasyncio as asyncio
+import hardware_setup  # Create a display instance
+from gui.core.ugui import Screen, ssd
+from gui.widgets import Label, Button, CloseButton, BMG
+# Create buffer for bitmapped graphic before fragmentation sets in
+scale = 1
+qr_ht = 100
+qr_wd = 100
+qr_buf = BMG.make_buffer(qr_ht, qr_wd)
+gc.collect()
+from gui.core.writer import CWriter
+import gui.fonts.arial10 as arial10
+from gui.core.colors import *
+
+
+class BaseScreen(Screen):
+
+    def __init__(self):
+
+        super().__init__()
+        wri = CWriter(ssd, arial10, GREEN, BLACK)
+        col = 2
+        row = 2
+        Label(wri, row, col, "Bitmap Demo.")
+        row = 50
+        self.graphic = BMG(wri, row, col, qr_ht, qr_wd, scale, fgcolor=WHITE, bgcolor=BLACK, buf=qr_buf)
+        #Button(wri, row, col, text="URL", callback=my_callback, args=(graphic, qr))
+        asyncio.create_task(self.animate())
+        CloseButton(wri)  # Quit the application
+
+    async def animate(self):
+        while True:
+            for n in range(13):
+                fn = f"/moon/m{n}.c"
+                #print(fn)
+                await asyncio.sleep_ms(200)
+                self.graphic.value(fn)
+
+def test():
+    print("Bitmap demo.")
+    Screen.change(BaseScreen)  # A class is passed here, not an instance.
+
+test()

gui/demos/qrcode.py

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+# qrcode.py Minimal micro-gui demo.
+
+# Released under the MIT License (MIT). See LICENSE.
+# Copyright (c) 2022 Peter Hinch
+
+# hardware_setup must be imported before other modules because of RAM use.
+import gc
+import hardware_setup  # Create a display instance
+from uQR import QRCode
+from gui.core.ugui import Screen, ssd
+from gui.widgets import Label, Button, CloseButton, BMG
+# Create buffer for bitmapped graphic before fragmentation sets in
+scale = 3  # Magnification of graphic
+qr_ht = scale * 41
+qr_wd = scale *41
+qr_buf = BMG.make_buffer(qr_ht, qr_wd)
+gc.collect()
+from gui.core.writer import CWriter
+import gui.fonts.arial10 as arial10
+from gui.core.colors import *
+
+
+class BaseScreen(Screen):
+
+    def __init__(self):
+
+        def my_callback(button, graphic, qr):
+            qr.clear()
+            qr.add_data("https://en.wikipedia.org/wiki/QR_code")
+            graphic.value(qr.get_matrix())
+
+        super().__init__()
+        wri = CWriter(ssd, arial10, GREEN, BLACK)
+        col = 2
+        row = 2
+        Label(wri, row, col, "QR code Demo.")
+        row = 50
+        graphic = BMG(wri, row, col, qr_ht, qr_wd, scale, fgcolor=BLACK, bgcolor=WHITE, buf=qr_buf)
+        qr = QRCode(version=4)  # Gives 41x41 matrix
+        qr.add_data("uQR rocks!")
+        graphic.value(qr.get_matrix())
+        col = 160
+        Button(wri, row, col, text="URL", callback=my_callback, args=(graphic, qr))
+        CloseButton(wri)  # Quit the application
+
+def test():
+    print("QR code demo.")
+    Screen.change(BaseScreen)  # A class is passed here, not an instance.
+
+test()