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This commit is contained in:
Andras Schmelczer 2026-05-04 16:19:09 +01:00
parent 0bae902e08
commit d4dde21ad2
46 changed files with 4953 additions and 966 deletions
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40
frontend/src/lib/consts.ts
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@ -44,6 +44,46 @@ export const FEATURE_GRADIENT: { t: number; color: [number, number, number] }[]
{ t: 1, color: [142, 68, 173] },
];
export type GradientStop = { t: number; color: [number, number, number] };
function partyGradient(color: [number, number, number]): GradientStop[] {
return [
{ t: 0, color: [255, 255, 255] },
{
t: 0.5,
color: [
Math.round(255 + (color[0] - 255) * 0.45),
Math.round(255 + (color[1] - 255) * 0.45),
Math.round(255 + (color[2] - 255) * 0.45),
],
},
{ t: 1, color },
];
}
/** UK party colours for the 2024 General Election vote-share map layers. */
export const PARTY_FEATURE_GRADIENTS: Record<string, GradientStop[]> = {
'% Labour': partyGradient([228, 0, 59]), // Labour red
'% Conservative': partyGradient([0, 135, 220]), // Conservative blue
'% Liberal Democrat': partyGradient([255, 100, 0]), // Liberal Democrat orange
'% Reform UK': partyGradient([18, 182, 207]), // Reform UK cyan
'% Green': partyGradient([106, 176, 35]), // Green Party green
'% Other parties': partyGradient([107, 114, 128]), // neutral fallback for grouped parties
};
export const PARTY_FEATURE_COLORS: Record<string, string> = Object.fromEntries(
Object.entries(PARTY_FEATURE_GRADIENTS).map(([featureName, gradient]) => {
const color = gradient[gradient.length - 1].color;
return [featureName, `rgb(${color[0]}, ${color[1]}, ${color[2]})`];
})
);
export function getFeatureGradient(featureName: string | null | undefined): GradientStop[] {
return featureName
? (PARTY_FEATURE_GRADIENTS[featureName] ?? FEATURE_GRADIENT)
: FEATURE_GRADIENT;
}
/** Number of properties gradient — light mode (cream → orange) */
export const DENSITY_GRADIENT: { t: number; color: [number, number, number] }[] = [
{ t: 0, color: [255, 255, 255] },