Function tryLabel

docs/app/js/sanddance-app.js:138819–138837

(_x, _y, maxSize, textWidth, textHeight)

    const width = $.width, height = $.height, bm0 = bitmaps[0], // where labels have been placed
    bm1 = bitmaps[1]; // area outlines
    function tryLabel(_x, _y, maxSize, textWidth, textHeight) {
        const x = $.invert(_x), y = $.invert(_y);
        let lo = maxSize, hi = height, mid;
        if (!outOfBounds(x, y, textWidth, textHeight, width, height) && !collision($, x, y, textHeight, textWidth, lo, bm0, bm1) && !collision($, x, y, textHeight, textWidth, textHeight, bm0, null)) {
            // if the label fits at the current sample point,
            // perform binary search to find the largest font size that fits
            while(hi - lo >= 1){
                mid = (lo + hi) / 2;
                if (collision($, x, y, textHeight, textWidth, mid, bm0, bm1)) hi = mid;
                else lo = mid;
            } // place label if current lower bound exceeds prior max font size
            if (lo > maxSize) return [
                x,
                y,
                lo,
                true
            ];
        }
    } // try to place a label within an input area mark
    return function(d) {
        const items = d.datum.datum.items[markIndex].items, // area points
        n = items.length, // number of points