Render cold icon next to outside thermometer

py/hexagram/cluster.py

@@ -11,7 +11,7 @@ from hexagram.speedo  import Speedo
 from hexagram.tacho   import Tacho
 from hexagram.fuel    import FuelGauge
 from hexagram.thermo  import Thermometer
-from hexagram.status  import StatusIconBox
+from hexagram.status  import VehicleStatus, StatusIcon, StatusIconBox
 
 class ShiftIndicator(Gauge):
     __slots__ = 'x', 'y', 'rpm_min', 'rpm_redline', 'rpm_max',
@@ -95,14 +95,61 @@ class Odometer(TextGauge):
         return "%.1f mi" % self.value
 
 class AmbientTemp(TextGauge):
+    __slots__ = 'icon',
+
+    ICON_WIDTH   = 40
+    ICON_HEIGHT  = 40
+    ICON_PADDING = 16
+    ICON_COLOR   = '#fff'
+
+    COLD_THRESHOLD = 4.0 # °C
+
     def __init__(self, x: float, y: float, align: Align):
         super().__init__(x, y, -100, 100, align)
 
         self.value = 0
+        self.icon  = StatusIcon(VehicleStatus.COLD,
+                                'cold',
+                                self.ICON_WIDTH,
+                                self.ICON_HEIGHT,
+                                self.ICON_COLOR,
+                                'path {stroke: %(s)s;stroke-width: 8}')
 
     def format_text(self):
         return "%.1f°C" % self.value
 
+    def draw_fg(self, cr: cairo.Context):
+        cr.select_font_face(self.FONT_FACE,
+                            self.FONT_SLANT,
+                            self.FONT_WEIGHT)
+
+        text = self.format_text()
+
+        cr.set_font_size(self.FONT_SIZE)
+
+        extents = cr.text_extents(text)
+        width   = extents[2] - extents[0]
+
+        if self.value <= self.COLD_THRESHOLD:
+            width += self.icon.width + self.ICON_PADDING
+
+        if self.align is Align.LEFT:
+            text_x_offset = 0.0
+        elif self.align is Align.MIDDLE:
+            text_x_offset = self.x - width / 2.0
+        elif self.align is Align.RIGHT:
+            text_x_offset = self.x - width
+
+        cr.set_source_rgb(1, 1, 1)
+        cr.move_to(text_x_offset, self.y)
+        cr.show_text(text)
+
+        icon_y_offset = abs(self.icon.height - self.FONT_SIZE) * 2
+
+        self.icon.draw(cr,
+                       text_x_offset + width - self.icon.width,
+                       self.y - icon_y_offset)
+
 class Clock(TextGauge):
     def __init__(self, x: float, y: float, align: Align):
         super().__init__(x, y, 0, 9999, align)