Function doThemeRiverLayout

src/chart/themeRiver/themeRiverLayout.ts:81–130

* The layout information about themeriver * * @param data data in the series * @param seriesModel the model object of themeRiver series * @param height value used to compute every series height

(
    data: SeriesData<ThemeRiverSeriesModel>,
    seriesModel: ThemeRiverSeriesModel,
    height: number
)

 * @param height  value used to compute every series height
 */
function doThemeRiverLayout(
    data: SeriesData<ThemeRiverSeriesModel>,
    seriesModel: ThemeRiverSeriesModel,
    height: number
) {
    if (!data.count()) {
        return;
    }
    const coordSys = seriesModel.coordinateSystem;
    // the data in each layer are organized into a series.
    const layerSeries = seriesModel.getLayerSeries();

    // the points in each layer.
    const timeDim = data.mapDimension('single');
    const valueDim = data.mapDimension('value');
    const layerPoints = zrUtil.map(layerSeries, function (singleLayer) {
        return zrUtil.map(singleLayer.indices, function (idx) {
            const pt = coordSys.dataToPoint(data.get(timeDim, idx));
            pt[1] = data.get(valueDim, idx) as number;
            return pt;
        });
    });

    const base = computeBaseline(layerPoints);
    const baseLine = base.y0;
    const ky = height / base.max;

    // set layout information for each item.
    const n = layerSeries.length;
    const m = layerSeries[0].indices.length;
    let baseY0;
    for (let j = 0; j < m; ++j) {
        baseY0 = baseLine[j] * ky;
        data.setItemLayout(layerSeries[0].indices[j], {
            layerIndex: 0,
            x: layerPoints[0][j][0],
            y0: baseY0,
            y: layerPoints[0][j][1] * ky
        });
        for (let i = 1; i < n; ++i) {
            baseY0 += layerPoints[i - 1][j][1] * ky;
            data.setItemLayout(layerSeries[i].indices[j], {
                layerIndex: i,
                x: layerPoints[i][j][0],
                y0: baseY0,
                y: layerPoints[i][j][1] * ky
            });
        }
    }
}

/**
 * Compute the baseLine of the rawdata