Add Pico display rendering abstraction

pico-dashboard/hardware/display.py

@@ -0,0 +1,31 @@
+class Display:
+    def __init__(self, driver=None):
+        self.driver = driver
+        self.commands = []
+
+    def clear(self):
+        self.commands.append(("clear",))
+
+    def text(self, x, y, value, size=1):
+        self.commands.append(("text", x, y, str(value), size))
+
+    def rect(self, x, y, w, h, filled=False):
+        self.commands.append(("rect", x, y, w, h, filled))
+
+    def flush(self):
+        if not self.driver:
+            return
+
+        for command in self.commands:
+            name = command[0]
+
+            if name == "clear":
+                self.driver.clear()
+            elif name == "text":
+                _, x, y, value, size = command
+                self.driver.text(x, y, value, size)
+            elif name == "rect":
+                _, x, y, w, h, filled = command
+                self.driver.rect(x, y, w, h, filled)
+
+        self.commands = []

pico-dashboard/ui/renderers.py

@@ -0,0 +1,51 @@
+class DashboardRenderer:
+    def __init__(self, display):
+        self.display = display
+
+    def render(self, view_model):
+        vm = view_model.as_dict()
+
+        self.display.clear()
+
+        top = vm["top_bar"]
+        self.display.text(0, 0, f'SOC {top["soc"]}')
+        self.display.text(120, 0, top["comms"])
+        self.display.text(260, 0, f'ALM {top["alarms"]}')
+
+        battery = vm["battery"]
+        self.display.text(0, 48, "Battery")
+        self.display.text(
+            0,
+            72,
+            f'{battery["voltage"]}  {battery["current"]}  {battery["runtime"]}',
+        )
+
+        fridge = vm["fridge"]
+        self.display.text(0, 128, "Fridge")
+        self.display.text(0, 152, f'Zone 1: {fridge["zone_1"]}')
+        self.display.text(0, 176, f'Zone 2: {fridge["zone_2"]}')
+
+        power = vm["power"]
+        self.display.text(0, 232, "Power")
+        self.display.text(
+            0,
+            256,
+            f'Starlink {power["starlink"]}  Fridge {power["fridge"]}',
+        )
+
+        self.render_nav("dashboard")
+
+    def render_nav(self, active_screen):
+        labels = [
+            ("dashboard", "Dash"),
+            ("battery", "Bat"),
+            ("temps", "Temps"),
+            ("power", "Power"),
+            ("system", "System"),
+        ]
+
+        x = 0
+        for screen, label in labels:
+            text = f"[{label}]" if screen == active_screen else label
+            self.display.text(x, 440, text)
+            x += 64

tests/test_pico_core.py

@@ -722,3 +722,59 @@ def test_touch_router_ignores_unpressed_event():
 
     assert handled is False
     assert screens.current_screen == "dashboard"
+
+
+def test_display_records_commands():
+    from hardware.display import Display
+
+    display = Display()
+
+    display.clear()
+    display.text(1, 2, "hello", size=2)
+    display.rect(3, 4, 5, 6, filled=True)
+
+    assert display.commands == [
+        ("clear",),
+        ("text", 1, 2, "hello", 2),
+        ("rect", 3, 4, 5, 6, True),
+    ]
+
+
+def test_dashboard_renderer_creates_draw_commands():
+    from hardware.display import Display
+    from ui.dashboard_view_model import DashboardViewModel
+    from ui.renderers import DashboardRenderer
+
+    state = AppState()
+    state.update_from_status({
+        "battery": {
+            "soc": 82,
+            "voltage": 13.2,
+            "current": -6.4,
+            "runtime_hours": 12.0,
+        },
+        "temps": {
+            "fridge_zone_1": 34.5,
+            "fridge_zone_2": 36.0,
+        },
+        "relays": {
+            "starlink": False,
+            "fridge": True,
+        },
+        "network": {
+            "uart_connected": True,
+        },
+    })
+
+    display = Display()
+    renderer = DashboardRenderer(display)
+
+    renderer.render(DashboardViewModel(state))
+
+    assert display.commands[0] == ("clear",)
+    assert ("text", 0, 0, "SOC 82%", 1) in display.commands
+    assert ("text", 120, 0, "UART OK", 1) in display.commands
+    assert ("text", 0, 48, "Battery", 1) in display.commands
+    assert ("text", 0, 128, "Fridge", 1) in display.commands
+    assert ("text", 0, 232, "Power", 1) in display.commands
+    assert ("text", 0, 440, "[Dash]", 1) in display.commands