react-native-chart-kit/dist/v2/core/scales/band.js

Beautiful React Native charts for dashboards, reports, and data-rich mobile apps.

export const createBandScale = ({ domain, range, paddingInner = 0, paddingOuter = 0 }) => {
    const count = domain.length;
    const rangeSpan = range[1] - range[0];
    const denominator = Math.max(1, count - paddingInner + paddingOuter * 2);
    const step = count === 0 ? 0 : rangeSpan / denominator;
    const bandwidth = step * Math.max(0, 1 - paddingInner);
    const positions = new Map();
    domain.forEach((value, index) => {
        positions.set(value, range[0] + step * (paddingOuter + index));
    });
    return {
        domain,
        range,
        bandwidth,
        step,
        scale: (value) => positions.get(value)
    };
};
export const createPointScale = ({ domain, range, padding = 0 }) => {
    const count = domain.length;
    const rangeSpan = range[1] - range[0];
    const step = count <= 1 ? 0 : rangeSpan / Math.max(1, count - 1 + padding * 2);
    const offset = count <= 1 ? rangeSpan / 2 : step * padding;
    const positions = new Map();
    domain.forEach((value, index) => {
        positions.set(value, range[0] + offset + step * index);
    });
    return {
        domain,
        range,
        step,
        scale: (value) => positions.get(value)
    };
};