apps: demo: Move the demo code into a fully fledged application

README.rst

@@ -109,18 +109,6 @@ At this point you will also be able to use the Nordic UART Service to
 access the MicroPython REPL, although currently you must send ^C to
 interrupt the program that updates the watch display.
 
-Just for fun try:
-
-.. code-block:: python
-
-   ^C
-   import demo
-   demo.run()
-   # After watching the demo for a bit...
-   ^C
-   wasp.app.draw(watch)
-   wasp.system.run()
-
 To set the time and restart the main application:
 
 .. code-block:: python

wasp/apps/demo.py

@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
+# Copyright (C) 2020 Daniel Thompson
+
+"""Logo demo for PineTime
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This demo is simply an alternating sweep of the Pine64 and
+MicroPython logos. It cycles through a variety of colours
+and swaps between the logos every 5 images (so if you change
+anything make sure len(colors) is not a multiple of 5).
+"""
+
+import wasp
+import logo
+import icons
+
+colors = (
+        0xffff,
+        0xf800, # red
+        0xffff,
+        0xffe0, # yellow
+        0xffff,
+        0x07e0, # green
+        0xffff,
+        0x07ff, # cyan
+        0xffff,
+        0x001f, # blue
+        0xffff,
+        0xf81f, # magenta
+    )
+
+class DemoApp():
+    """Application for live demos.
+
+    Start this to give the watch something "interesting" to do when talking
+    over demos!
+    """
+    NAME = 'Demo'
+    ICON = icons.app
+
+    def __init__(self):
+        self._logo = logo.pine64
+        self._color = 0
+        self._i = 0
+
+    def foreground(self):
+        """Draw the first frame and establish the tick."""
+        self._draw()
+        wasp.system.request_tick(2000)
+
+    def tick(self, ticks):
+        """Handle the tick."""
+        self._draw()
+        wasp.system.keep_awake()
+
+    def _draw(self):
+        """Draw the next frame."""
+        draw = wasp.watch.drawable
+
+        if self._i < 5:
+            self._i += 1
+        else:
+            self._i = 0
+            if self._logo == logo.pine64:
+                self._logo = logo.micropython
+            else:
+                self._logo = logo.pine64
+            draw.fill()
+        draw.rleblit(self._logo, fg=colors[self._color])
+        self._color += 1
+        if self._color >= len(colors):
+            self._color = 0

wasp/demo.py

@@ -1,65 +0,0 @@
-# SPDX-License-Identifier: LGPL-3.0-or-later
-# Copyright (C) 2020 Daniel Thompson
-
-#
-# Logo demo for PineTime
-#
-# This demo is simply an alternating sweep of the Pine64 and
-# MicroPython logos. It cycles through a variety of colours
-# and swaps between the logos every 5 images (so make sure
-# len(colors) is not a multiple of 5 ;-) ).
-#
-
-import watch, logo, time, gc
-
-colors = (
-        0xffff,
-        0xf800, # red
-        0xffff,
-        0xffe0, # yellow
-        0xffff,
-        0x07e0, # green
-        0xffff,
-        0x07ff, # cyan
-        0xffff,
-        0x001f, # blue
-        0xffff,
-        0xf81f, # magenta
-    )
-
-def textdemo():
-    watch.display.fill(0)
-    draw = watch.drawable
-    draw.string("The quick brown", 12, 24)
-    draw.string("fox jumped over", 12, 48)
-    draw.string("the lazy dog.", 12, 72)
-    time.sleep(2)
-    draw.string("0123456789", 12, 120)
-    draw.string('!"£$%^&*()', 12, 144)
-    time.sleep(3)
-
-def run():
-    l = logo.pine64
-    i = 0
-
-    watch.display.poweron()
-    watch.backlight.set(2)
-
-    while True:
-        for c in colors:
-            if i == 2:
-                textdemo()
-            if i < 5:
-                i += 1
-            else:
-                i = 0
-                if l == logo.pine64:
-                    l = logo.micropython
-                else:
-                    l = logo.pine64
-                watch.display.fill(0)
-
-            watch.drawable.rleblit(l, fg=c)
-            time.sleep(2)
-            gc.collect()
-