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

the Grammar of Graphics in Javascript

import { Band } from '@antv/scale';
import { deepMix } from '@antv/util';
import { column, columnOf } from './utils/helper';
import { domainOf } from './utils/order';
export function rangeOf(value, scaleOptions, padding) {
    if (value === null)
        return [-0.5, 0.5];
    const domain = domainOf(value, scaleOptions);
    const scale = new Band({ domain, range: [0, 1], padding });
    const step = scale.getBandWidth();
    return [-step / 2, step / 2];
}
export function interpolate(t, a, b) {
    return a * (1 - t) + b * t;
}
/**
 * The jitter transform produce dx and dy channels for marks (especially for point)
 * with ordinal x and y dimension, say to make them jitter in their own space.
 */
export const Jitter = (options = {}) => {
    const { padding = 0, paddingX = padding, paddingY = padding, random = Math.random, } = options;
    return (I, mark) => {
        const { encode, scale } = mark;
        const { x: scaleX, y: scaleY } = scale;
        const [X] = columnOf(encode, 'x');
        const [Y] = columnOf(encode, 'y');
        const rangeX = rangeOf(X, scaleX, paddingX);
        const rangeY = rangeOf(Y, scaleY, paddingY);
        const DY = I.map(() => interpolate(random(), ...rangeY));
        const DX = I.map(() => interpolate(random(), ...rangeX));
        return [
            I,
            deepMix({
                scale: {
                    x: { padding: 0.5 },
                    y: { padding: 0.5 },
                },
            }, mark, {
                encode: { dy: column(DY), dx: column(DX) },
            }),
        ];
    };
};
Jitter.props = {};
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