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A gauge needle, of sorts!

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XANTRONIX 2024-01-01 17:10:23 -05:00
parent 265b27196c
commit dbe473224b
1 changed files with 24 additions and 0 deletions
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24
py/hexagram/dial.py
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@ -55,6 +55,30 @@ class Dial(Gauge):
cr.stroke() cr.stroke()
def draw_needle(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 - 4 * (math.pi / 180.0)
angle_start = angle - 4 * (math.pi / 180.0)
angle_end = angle + 4 * (math.pi / 180.0)
cr.set_source_rgba(1, 1, 1, 0.75)
cr.move_to(self.x + (min_radius * self.radius) * math.cos(angle_start),
self.y + (min_radius * self.radius) * math.sin(angle_start))
cr.line_to(self.x + (max_radius * self.radius) * math.cos(angle),
self.y + (max_radius * self.radius) * math.sin(angle))
cr.line_to(self.x + (max_radius * self.radius) * math.cos(angle_end),
self.y + (max_radius * self.radius) * math.sin(angle_end))
cr.line_to(self.x + (min_radius * self.radius) * math.cos(angle_end),
self.y + (min_radius * self.radius) * math.sin(angle_end))
cr.fill()
def draw_bg(self, cr: cairo.Context): def draw_bg(self, cr: cairo.Context):
arc = (self.x, arc = (self.x,
self.y, self.y,