From cec20b55bd9c5b18dc8f22ddfade8e2195758a6f Mon Sep 17 00:00:00 2001
From: XANTRONIX Development <dev@xantronix.com>
Date: Mon, 1 Jan 2024 01:47:56 -0500
Subject: [PATCH] Ugly hack but I have a fuel gauge???

---
 py/hexagram/cluster.py |  8 +++++-
 py/hexagram/fuel.py    | 63 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 py/hexagram/fuel.py

diff --git a/py/hexagram/cluster.py b/py/hexagram/cluster.py
index 2d4e1d4..faafa3c 100644
--- a/py/hexagram/cluster.py
+++ b/py/hexagram/cluster.py
@@ -8,6 +8,7 @@ from hexagram.gauge   import Gauge
 from hexagram.dial    import Dial
 from hexagram.speedo  import Speedo
 from hexagram.tacho   import Tacho
+from hexagram.fuel    import FuelGauge
 
 class ShiftIndicator(Gauge):
     __slots__ = 'x', 'y', 'rpm_redline', 'rpm_max',
@@ -64,7 +65,7 @@ class Cluster():
     SHIFT_INDICATOR_X = 392
     SHIFT_INDICATOR_Y =  24
 
-    __slots__ = 'gauges', 'speedo', 'tacho',
+    __slots__ = 'gauges', 'speedo', 'tacho', 'fuel',
 
     def __init__(self, rpm_redline: float, rpm_max: float):
         self.gauges: List[Gauge] = list()
@@ -79,7 +80,12 @@ class Cluster():
                            self.HEIGHT / 2,
                            8000)
 
+        self.fuel = FuelGauge(self.HEIGHT / 2,
+                              self.HEIGHT / 2,
+                              self.HEIGHT / 2)
+
         self.gauges.append(self.speedo)
+        self.gauges.append(self.fuel)
         self.gauges.append(self.tacho)
 
         self.gauges.append(ShiftIndicator(self.SHIFT_INDICATOR_X,
diff --git a/py/hexagram/fuel.py b/py/hexagram/fuel.py
new file mode 100644
index 0000000..9ff71b8
--- /dev/null
+++ b/py/hexagram/fuel.py
@@ -0,0 +1,63 @@
+import enum
+import math
+import cairo
+
+from hexagram.dial import Dial
+
+class FuelGauge(Dial):
+    MIN_ANGLE = 144.0 * (math.pi / 180.0)
+    MAX_ANGLE = 216.0 * (math.pi / 180.0)
+
+    MAX_VALUE = 15
+
+    FONT_FACE = "Muli"
+
+    def __init__(self, x: float, y: float, radius: float):
+        super().__init__(x, y, radius, self.MIN_ANGLE, self.MAX_ANGLE, self.MAX_VALUE)
+
+    def draw_value(self, cr: cairo.Context, radius: float, value: float, text: str, x_offset: float):
+        scale = (self.max_value - value) / self.max_value
+        angle = self.min_angle + ((self.max_angle - self.min_angle) * scale) - self.ANGLE_OFFSET
+
+        cr.move_to(self.x + radius * self.radius * math.cos(angle) + x_offset,
+                   self.y + radius * self.radius * math.sin(angle))
+
+        cr.show_text(text)
+        cr.stroke()
+
+    def draw_mark(self, cr: cairo.Context, min_radius: float, max_radius: float, value: float):
+        angle = self.min_angle + \
+            ((self.max_angle - self.min_angle) * (value / self.max_value)) - self.ANGLE_OFFSET
+
+        cr.move_to(self.x + (min_radius * self.radius) * math.cos(angle),
+                   self.y + (min_radius * self.radius) * math.sin(angle))
+
+        cr.line_to(self.x + (max_radius * self.radius) * math.cos(angle),
+                   self.y + (max_radius * self.radius) * math.sin(angle))
+
+        cr.stroke()
+
+    def draw_bg(self, cr: cairo.Context):
+        cr.select_font_face(self.FONT_FACE,
+                            cairo.FontSlant.NORMAL,
+                            cairo.FontWeight.BOLD)
+
+        cr.set_font_size(self.radius * 0.1)
+
+        cr.set_source_rgb(1, 0, 0)
+        self.draw_value(cr, 0.75,  0, "0", -10)
+
+        cr.set_source_rgb(1, 1, 1)
+        self.draw_value(cr, 0.75, 15, "1", 0)
+
+        cr.set_line_width(6.0)
+
+        for level in range(0, self.MAX_VALUE+1):
+            if level < 4:
+                min_radius = 0.84
+                cr.set_source_rgb(1, 0, 0)
+            else:
+                min_radius = 0.82
+                cr.set_source_rgb(1, 1, 1)
+
+            self.draw_mark(cr, min_radius, 0.87, self.max_value - level)