Function positionTitleOutside

src/traces/pie/plot.js:877–933

(cd0, plotSize)

}

function positionTitleOutside(cd0, plotSize) {
    var scaleX = 1;
    var scaleY = 1;
    var maxPull;

    var trace = cd0.trace;
    // position of the baseline point of the text box in the plot, before scaling.
    // we anchored the text in the middle, so the baseline is on the bottom middle
    // of the first line of text.
    var topMiddle = {
        x: cd0.cx,
        y: cd0.cy
    };
    // relative translation of the text box after scaling
    var translate = {
        tx: 0,
        ty: 0
    };

    // we reason below as if the baseline is the top middle point of the text box.
    // so we must add the font size to approximate the y-coord. of the top.
    // note that this correction must happen after scaling.
    translate.ty += trace.title.font.size;
    maxPull = getMaxPull(trace);

    if (trace.title.position.indexOf('top') !== -1) {
        topMiddle.y -= (1 + maxPull) * cd0.r;
        translate.ty -= cd0.titleBox.height;
    } else if (trace.title.position.indexOf('bottom') !== -1) {
        topMiddle.y += (1 + maxPull) * cd0.r;
    }

    var rx = applyAspectRatio(cd0.r, cd0.trace.aspectratio);

    var maxWidth = (plotSize.w * (trace.domain.x[1] - trace.domain.x[0])) / 2;
    if (trace.title.position.indexOf('left') !== -1) {
        // we start the text at the left edge of the pie
        maxWidth = maxWidth + rx;
        topMiddle.x -= (1 + maxPull) * rx;
        translate.tx += cd0.titleBox.width / 2;
    } else if (trace.title.position.indexOf('center') !== -1) {
        maxWidth *= 2;
    } else if (trace.title.position.indexOf('right') !== -1) {
        maxWidth = maxWidth + rx;
        topMiddle.x += (1 + maxPull) * rx;
        translate.tx -= cd0.titleBox.width / 2;
    }
    scaleX = maxWidth / cd0.titleBox.width;
    scaleY = getTitleSpace(cd0, plotSize) / cd0.titleBox.height;
    return {
        x: topMiddle.x,
        y: topMiddle.y,
        scale: Math.min(scaleX, scaleY),
        tx: translate.tx,
        ty: translate.ty
    };
}