@antv/g2/esm/transform/diffY.js

the Grammar of Graphics in Javascript

import { deepMix } from '@antv/util';
import { column, columnOf } from './utils/helper';
import { createGroups } from './utils/order';
/**
 * The DiffY transform apply offset for y0 channels.
 * Keep y unchanged, set y1 = max(otherY), if y1 > y, remove the data.
 */
export const DiffY = (options = {}) => {
    const { groupBy = 'x' } = options;
    return (I, mark) => {
        const { encode } = mark;
        const [Y] = columnOf(encode, 'y');
        const [_, fy1] = columnOf(encode, 'y1');
        // Create groups and apply specified order for each group.
        const groups = createGroups(groupBy, I, mark);
        // Only adjust Y1 channel.
        const newY1 = new Array(I.length);
        for (const G of groups) {
            const YG = G.map((i) => +Y[i]);
            // Process each series.
            for (let idx = 0; idx < G.length; idx++) {
                const i = G[idx];
                // Get the max Y of current group with current Y exclude.
                const max = Math.max(...YG.filter((_, _i) => _i !== idx));
                // Diff Y value.
                newY1[i] = +Y[i] > max ? max : Y[i];
            }
        }
        return [
            I,
            deepMix({}, mark, {
                encode: {
                    y1: column(newY1, fy1),
                },
            }),
        ];
    };
};
DiffY.props = {};
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