wasp: clock: Add a simple battery meter

1 files changed, 48 insertions, 0 deletions

diff --git a/wasp/widgets.py b/wasp/widgets.py
new file mode 100644
index 0000000..90e98ea
--- /dev/null
+++ b/wasp/widgets.py
@@ -0,0 +1,48 @@
+import icons
+import watch
+
+class BatteryMeter(object):
+    def __init__(self):
+        self.level = None
+
+    def draw(self):
+        display = watch.display
+        icon = icons.battery
+
+        watch.display.rleblit(icon, pos=(239-icon[0], 0), fg=0x7bef)
+        self.level = -1
+        self.update()
+        
+    def update(self):
+        if watch.battery.charging():
+            if self.level != -1:
+                icon = icons.battery
+                watch.display.rleblit(icon, pos=(239-icon[0], 0), fg=0x7bef)
+                self.level = -1
+        else:
+            level = watch.battery.level()
+            if level == self.level:
+                return
+            self.level = level
+            x = 239 - 31
+            w = 18
+
+            # Use the level to work out the correct height
+            if level == 100:
+                h = 26
+            else:
+                h = level // 4
+
+            # Use the level to figure out the right color
+            if level > 96:
+                rgb = 0x07e0
+            else:
+                green = level // 3
+                red = 31-green
+                rgb = (red << 11) + (green << 6)
+
+            if 26 - h:
+                watch.display.fill(0, x, 13, 18, 26 - h)
+            if h:
+                watch.display.fill(rgb, x, 39 - h, 18, h)
+