52 lines
1.9 KiB
Python
52 lines
1.9 KiB
Python
from __future__ import annotations
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import json
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from backend.node_registry import register_node
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from backend.data_types import COLORMAPS, DEFAULT_CUSTOM_COLORMAP_STOPS, normalize_colormap_spec
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@register_node(display_name="Color Map")
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class ColorMap:
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@classmethod
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def INPUT_TYPES(cls):
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return {
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"required": {
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"mode": (["preset", "custom"], {"default": "preset"}),
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"preset": (list(COLORMAPS), {
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"default": "viridis",
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"show_when_widget_value": {"mode": ["preset"]},
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}),
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"stops": ("STRING", {
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"default": json.dumps(list(DEFAULT_CUSTOM_COLORMAP_STOPS)),
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"colormap_stops": True,
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"show_when_widget_value": {"mode": ["custom"]},
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}),
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}
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}
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OUTPUTS = (
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('COLORMAP', 'colormap'),
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)
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FUNCTION = "build"
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DESCRIPTION = (
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"Build a reusable colormap. Choose a preset, or create a custom gradient with min/max colours "
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"and any number of intermediate stops."
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)
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KEYWORDS = ("colour", "palette", "lut", "gradient")
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def build(self, mode: str, preset: str, stops: str | None = None, stops_json: str | None = None) -> tuple:
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if mode == "preset":
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return ({"mode": "preset", "preset": normalize_colormap_spec(preset)},)
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try:
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raw_stops = stops if stops is not None else stops_json
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stops_data = json.loads(raw_stops or "[]")
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except json.JSONDecodeError as exc:
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raise ValueError("Custom colormap stops must be valid JSON.") from exc
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spec = normalize_colormap_spec({"mode": "custom", "stops": stops_data}, fallback=None)
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if not (isinstance(spec, dict) and spec.get("mode") == "custom"):
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raise ValueError("Custom colormap must include at least min and max colours.")
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return (spec,)
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