c3/es6_modules/internals/region.js

const initRegion = function () {
    const $$ = this;
    $$.region = $$.main.append('g')
        .attr('clip-path', $$.clipPath)
        .attr('class', CLASS.regions);
};
const updateRegion = function (duration) {
    let $$ = this, config = $$.config;

    // hide if arc type
    $$.region.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');

    $$.mainRegion = $$.main.select('.' + CLASS.regions).selectAll('.' + CLASS.region)
        .data(config.regions);
    $$.mainRegion.enter().append('g')
      .append('rect')
        .style('fill-opacity', 0);
    $$.mainRegion
        .attr('class', $$.classRegion.bind($$));
    $$.mainRegion.exit().transition().duration(duration)
        .style('opacity', 0)
        .remove();
};
const redrawRegion = function (withTransition) {
    let $$ = this,
        regions = $$.mainRegion.selectAll('rect').each(function () {
            // data is binded to g and it's not transferred to rect (child node) automatically,
            // then data of each rect has to be updated manually.
            // TODO: there should be more efficient way to solve this?
            const parentData = $$.d3.select(this.parentNode).datum();
            $$.d3.select(this).datum(parentData);
        }),
        x = $$.regionX.bind($$),
        y = $$.regionY.bind($$),
        w = $$.regionWidth.bind($$),
        h = $$.regionHeight.bind($$);
    return [
        (withTransition ? regions.transition() : regions)
            .attr('x', x)
            .attr('y', y)
            .attr('width', w)
            .attr('height', h)
            .style('fill-opacity', (d) => { return isValue(d.opacity) ? d.opacity : 0.1; }),
    ];
};
const regionX = function (d) {
    let $$ = this, config = $$.config,
        xPos, yScale = d.axis === 'y' ? $$.y : $$.y2;
    if (d.axis === 'y' || d.axis === 'y2') {
        xPos = config.axis_rotated ? ('start' in d ? yScale(d.start) : 0) : 0;
    } else {
        xPos = config.axis_rotated ? 0 : ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0);
    }
    return xPos;
};
const regionY = function (d) {
    let $$ = this, config = $$.config,
        yPos, yScale = d.axis === 'y' ? $$.y : $$.y2;
    if (d.axis === 'y' || d.axis === 'y2') {
        yPos = config.axis_rotated ? 0 : ('end' in d ? yScale(d.end) : 0);
    } else {
        yPos = config.axis_rotated ? ('start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0) : 0;
    }
    return yPos;
};
const regionWidth = function (d) {
    let $$ = this, config = $$.config,
        start = $$.regionX(d), end, yScale = d.axis === 'y' ? $$.y : $$.y2;
    if (d.axis === 'y' || d.axis === 'y2') {
        end = config.axis_rotated ? ('end' in d ? yScale(d.end) : $$.width) : $$.width;
    } else {
        end = config.axis_rotated ? $$.width : ('end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.width);
    }
    return end < start ? 0 : end - start;
};
const regionHeight = function (d) {
    let $$ = this, config = $$.config,
        start = this.regionY(d), end, yScale = d.axis === 'y' ? $$.y : $$.y2;
    if (d.axis === 'y' || d.axis === 'y2') {
        end = config.axis_rotated ? $$.height : ('start' in d ? yScale(d.start) : $$.height);
    } else {
        end = config.axis_rotated ? ('end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.height) : $$.height;
    }
    return end < start ? 0 : end - start;
};
const isRegionOnX = function (d) {
    return !d.axis || d.axis === 'x';
};

export {
    initRegion,
    updateRegion,
    redrawRegion,
    regionX,
    regionY,
    regionWidth,
    regionHeight,
    isRegionOnX,
};