40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
import enum
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import math
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import cairo
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from hexagram.dial import Dial
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class Tacho(Dial):
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__slots__ = 'units',
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MIN_ANGLE = 232.0 * (math.pi / 180.0)
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MAX_ANGLE = 488.0 * (math.pi / 180.0)
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FONT_FACE = "Muli"
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def __init__(self, x: float, y: float, radius: float, max_value: float):
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super().__init__(x, y, radius, self.MIN_ANGLE, self.MAX_ANGLE, max_value)
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def draw_number(self, cr: cairo.Context, radius: float, value: float, text: str):
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scale = value / self.max_value
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angle = self.min_angle + ((self.max_angle - self.min_angle) * scale) - Dial.ANGLE_OFFSET
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cr.set_source_rgb(1, 1, 1)
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cr.move_to(self.x + radius * self.radius * math.cos(angle) - 8,
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self.y + radius * self.radius * math.sin(angle) + 15)
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cr.show_text(text)
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cr.stroke()
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def draw_bg(self, cr: cairo.Context):
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super().draw_bg(cr)
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cr.select_font_face(self.FONT_FACE,
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cairo.FontSlant.ITALIC,
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cairo.FontWeight.BOLD)
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cr.set_font_size(self.radius * 0.15)
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cr.set_source_rgb(1, 1, 1)
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for speed in range(0, int(self.max_value)+1, 1000):
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self.draw_number(cr, 0.78, speed, "%d" % int(speed / 1000))
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