Erstveröffentlichung Weihnachten 2024
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58
pages/exhaust.py
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58
pages/exhaust.py
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"""
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XY-Graphik der Abgastemperatur
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"""
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import cairo
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import math
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from .page import Page
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class Exhaust(Page):
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def draw(self, ctx):
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# Title
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ctx.select_font_face("Ubuntu", cairo.FontSlant.NORMAL, cairo.FontWeight.BOLD)
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ctx.set_font_size(24)
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ctx.move_to(10, 45)
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ctx.show_text("Exhaust Temperature")
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# Graph anzeigen X/Y
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x0 = 55
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y0 = 255
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w = 300
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h = 200
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# X-Achse
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ctx.move_to(x0 - 20, y0)
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ctx.line_to(x0 + w, y0)
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# Y-Achse
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ctx.move_to(x0, y0 + 20)
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ctx.line_to(x0, y0 - h)
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ctx.stroke()
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# Pfeispitze X
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ctx.move_to(x0-4, y0 - h + 12)
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ctx.line_to(x0, y0 - h)
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ctx.line_to(x0 + 4, y0 - h + 12)
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ctx.fill()
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# Pfeilspitze Y
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ctx.move_to(x0 + w -12, y0 - 4)
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ctx.line_to(x0 + w, y0)
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ctx.line_to(x0 + w - 12, y0 + 4)
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ctx.fill()
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# Achsenbeschriftung
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ctx.set_font_size(16)
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ctx.move_to(x0 - 30, y0 - h + 20)
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ctx.show_text("°C")
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ctx.move_to(x0 + w - 10, y0 + 15)
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ctx.show_text("min")
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# Hier wird eine Reihe von Meßwerten erwartet
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# Aufgrund min und max kann die Y-Achse skaliert werden
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# Die X-Achse ist die Zeit
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self.draw_text_center(ctx, x0 - 30, y0 - h / 2, "Temperature", True, False)
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# Einzeichnen von zwei Warnschwellen als horizontale
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# Linie (gestrichelt)
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