@antv/g2/esm/shape/heatmap/renderer/gradient.js

the Grammar of Graphics in Javascript

/**
 * Parse heatmap gradient.
 */
export function parseGradient(gradient) {
    if (typeof gradient === 'string') {
        return gradient.split(' ').map((stop) => {
            const [r, c] = stop.split(':');
            return [+r, c];
        });
    }
    return gradient;
}
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