@antv/g2/esm/utils/scale.js

the Grammar of Graphics in Javascript

import { bisectLeft, sort } from 'd3-array';
function constrain(x, lo, hi) {
    return Math.min(hi, Math.max(lo, x));
}
export function isOrdinalScale(scale) {
    return !!scale.getBandWidth;
}
export function invert(scale, x, start) {
    if (!isOrdinalScale(scale))
        return scale.invert(x);
    const { adjustedRange } = scale;
    const { domain } = scale.getOptions();
    const offset = start ? -1 : 0;
    const step = scale.getStep();
    const range = start ? adjustedRange : adjustedRange.map((d) => d + step);
    // R[i0 - 1] < x <= R[i0]
    const i0 = bisectLeft(range, x);
    const i1 = constrain(i0 + offset, 0, domain.length - 1);
    return domain[i1];
}
export function domainOf(scale, values, ratioX) {
    if (!values)
        return scale.getOptions().domain;
    if (!isOrdinalScale(scale)) {
        const sortedDomain = sort(values);
        if (!ratioX)
            return sortedDomain;
        const [d] = sortedDomain;
        const { range } = scale.getOptions();
        const [r0, r1] = range;
        const v = r0 > r1 ? -1 : 1;
        const d1 = scale.invert(scale.map(d) + v * ratioX);
        return [d, d1];
    }
    const { domain } = scale.getOptions();
    const v1 = values[0];
    const start = domain.indexOf(v1);
    if (ratioX) {
        const end = start + Math.round(domain.length * ratioX);
        return domain.slice(start, end);
    }
    const v2 = values[values.length - 1];
    const end = domain.indexOf(v2);
    return domain.slice(start, end + 1);
}
export function selectionOf(x, y, x1, y1, scale, coordinate) {
    const { x: scaleX, y: scaleY } = scale;
    const abstractDomain = (point, start) => {
        const [x, y] = coordinate.invert(point);
        return [invert(scaleX, x, start), invert(scaleY, y, start)];
    };
    const p0 = abstractDomain([x, y], true);
    const p1 = abstractDomain([x1, y1], false);
    const domainX = domainOf(scaleX, [p0[0], p1[0]]);
    const domainY = domainOf(scaleY, [p0[1], p1[1]]);
    return [domainX, domainY];
}
export function abstractOf(domain, scale) {
    const [d0, d1] = domain;
    const maybeStep = (scale) => (scale.getStep ? scale.getStep() : 0);
    return [scale.map(d0), scale.map(d1) + maybeStep(scale)];
}
export function pixelsOf(selection, scale, coordinate) {
    const { x: scaleX, y: scaleY } = scale;
    const [X, Y] = selection;
    const AX = abstractOf(X, scaleX);
    const AY = abstractOf(Y, scaleY);
    const p0 = [AX[0], AY[0]];
    const p1 = [AX[1], AY[1]];
    const [x, y] = coordinate.map(p0);
    const [x1, y1] = coordinate.map(p1);
    return [x, y, x1, y1];
}
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