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

the Grammar of Graphics in Javascript

import { deepMix } from '@antv/util';
import { column, columnOf } from './utils/helper';
import { rangeOf, interpolate } from './jitter';
/**
 * The JitterY transform produce dy channels for marks (especially for point)
 * with ordinal x and y dimension, say to make them jitter in their own space.
 */
export const JitterY = (options = {}) => {
    const { padding = 0, random = Math.random } = options;
    return (I, mark) => {
        const { encode, scale } = mark;
        const { y: scaleY } = scale;
        const [Y] = columnOf(encode, 'y');
        const rangeY = rangeOf(Y, scaleY, padding);
        const DY = I.map(() => interpolate(random(), ...rangeY));
        return [
            I,
            deepMix({ scale: { y: { padding: 0.5 } } }, mark, {
                encode: { dy: column(DY) },
            }),
        ];
    };
};
JitterY.props = {};
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