31 lines
1.1 KiB
Python
31 lines
1.1 KiB
Python
class ColorCache:
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def __init__(self):
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# Use these colors for labels
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self.colors = [
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"#FFFFFF", "#999999", "#FF9999", "#FFCC99", "#FFFF99", "#CCFF99",
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"#99FF99", "#99FFCC", "#99FFFF", "#99CCFF", "#9999FF", "#CC99FF",
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"#FF99FF", "#FF99CC",
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]
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# Labels are cached here
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self.colorBuf = {}
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# Get a unique color for a given ID, reusing colors as we go
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def getColor(self, id: str) -> str:
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if id in self.colorBuf:
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# Sort entries in order of freshness
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color = self.colorBuf.pop(id)
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elif len(self.colorBuf) < len(self.colors):
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# Assign each initial entry color based on its order
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color = self.colors[len(self.colorBuf)]
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else:
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# If we run out of colors, reuse the oldest entry
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color = self.colorBuf.pop(next(iter(self.colorBuf)))
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# Done
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self.colorBuf[id] = color
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return color
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def rename(self, old_id: str, new_id: str):
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if old_id in self.colorBuf and new_id != old_id:
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self.colorBuf[new_id] = self.colorBuf[old_id]
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del self.colorBuf[old_id]
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