Function axisTitle

docs/app/js/sanddance-app.js:149195–149251

(spec, config, userEncode, dataRef)

    }, userEncode);
}
function axisTitle(spec, config, userEncode, dataRef) {
    const _ = lookup(spec, config), orient = spec.orient, sign = getSign(orient, -1, 1);
    let enter, update;
    const encode = {
        enter: enter = {
            opacity: zero,
            anchor: encoder(_("titleAnchor", null)),
            align: {
                signal: alignExpr$1
            }
        },
        update: update = (0, _vegaUtil.extend)({}, enter, {
            opacity: one,
            text: encoder(spec.title)
        }),
        exit: {
            opacity: zero
        }
    };
    const titlePos = {
        signal: `lerp(range("${spec.scale}"), ${anchorExpr(0, 1, 0.5)})`
    };
    update.x = ifX(orient, titlePos);
    update.y = ifY(orient, titlePos);
    enter.angle = ifX(orient, zero, mult(sign, 90));
    enter.baseline = ifX(orient, ifTop(orient, Bottom, Top), {
        value: Bottom
    });
    update.angle = enter.angle;
    update.baseline = enter.baseline;
    addEncoders(encode, {
        fill: _("titleColor"),
        fillOpacity: _("titleOpacity"),
        font: _("titleFont"),
        fontSize: _("titleFontSize"),
        fontStyle: _("titleFontStyle"),
        fontWeight: _("titleFontWeight"),
        limit: _("titleLimit"),
        lineHeight: _("titleLineHeight")
    }, {
        // require update
        align: _("titleAlign"),
        angle: _("titleAngle"),
        baseline: _("titleBaseline")
    });
    autoLayout(_, orient, encode, userEncode);
    encode.update.align = patch(encode.update.align, enter.align);
    encode.update.angle = patch(encode.update.angle, enter.angle);
    encode.update.baseline = patch(encode.update.baseline, enter.baseline);
    return guideMark({
        type: TextMark,
        role: AxisTitleRole,
        style: GuideTitleStyle,
        from: dataRef,
        encode
    }, userEncode);
}
function autoLayout(_, orient, encode, userEncode) {