Function markStager

packages/vega-deck.gl/src/marks/text.ts:27–66

(options: MarkStagerOptions, stage: Stage, scene: Scene, x: number, y: number, groupType: GroupType)

}

const markStager: MarkStager = (options: MarkStagerOptions, stage: Stage, scene: Scene, x: number, y: number, groupType: GroupType) => {

    //scale Deck.Gl text to Vega size
    const fontScale = 1;

    //change direction of y from SVG to GL
    const ty = -1;

    base.vega.sceneVisit(scene, function (item: SceneText2) {
        if (!item.text) return;
        const size = item.fontSize * fontScale;
        const alignmentBaseline = convertBaseline(item.baseline);
        const yOffset = alignmentBaseline === 'top' ? item.fontSize / 2 : 0;    //fixup to get tick text correct
        const textItem: VegaTextLayerDatum = {
            color: colorFromString(item.fill),
            text: item.limit === undefined ? item.text : base.vega.truncate(item.text, item.limit, 'right', item.ellipsis || '...'),   //use dots instead of unicode ellipsis for deck.gl's default font atlas
            position: [x + (item.x || 0), ty * (y + (item.y || 0) + yOffset), 0],
            size,
            angle: convertAngle(item.angle),
            textAnchor: convertAlignment(item.align),
            alignmentBaseline,
            metaData: item.metaData,
        };
        if (item.mark.role === 'axis-label') {
            const tickText = textItem as TickText;
            tickText.value = (item.datum as LabelDatum).value;
            if (options.currAxis.role === 'z') {
                zSwap(tickText.position);
            }
            options.currAxis.tickText.push(tickText);
        } else if (item.mark.role === 'axis-title') {
            if (options.currAxis.role === 'z') {
                zSwap(textItem.position);
            }
            options.currAxis.title = textItem;
        } else {
            stage.textData.push(textItem);
        }
    });
};

function convertAngle(vegaTextAngle: number) {
    if (vegaTextAngle && !isNaN(vegaTextAngle)) {