Function placeMarkLabel

docs/app/js/sanddance-app.js:138998–139040

($, bitmaps, anchors, offsets)

    "top"
];
function placeMarkLabel($, bitmaps, anchors, offsets) {
    const width = $.width, height = $.height, bm0 = bitmaps[0], bm1 = bitmaps[1], n = offsets.length;
    return function(d) {
        const boundary = d.boundary, textHeight = d.datum.fontSize; // can not be placed if the mark is not visible in the graph bound
        if (boundary[2] < 0 || boundary[5] < 0 || boundary[0] > width || boundary[3] > height) return false;
        let textWidth = 0, dx, dy, isInside, sizeFactor, insideFactor, x1, x2, y1, y2, xc, yc, _x1, _x2, _y1, _y2; // for each anchor and offset
        for(let i7 = 0; i7 < n; ++i7){
            dx = (anchors[i7] & 0x3) - 1;
            dy = (anchors[i7] >>> 0x2 & 0x3) - 1;
            isInside = dx === 0 && dy === 0 || offsets[i7] < 0;
            sizeFactor = dx && dy ? Math.SQRT1_2 : 1;
            insideFactor = offsets[i7] < 0 ? -1 : 1;
            x1 = boundary[1 + dx] + offsets[i7] * dx * sizeFactor;
            yc = boundary[4 + dy] + insideFactor * textHeight * dy / 2 + offsets[i7] * dy * sizeFactor;
            y1 = yc - textHeight / 2;
            y2 = yc + textHeight / 2;
            _x1 = $(x1);
            _y1 = $(y1);
            _y2 = $(y2);
            if (!textWidth) {
                // to avoid finding width of text label,
                if (!test(_x1, _x1, _y1, _y2, bm0, bm1, x1, x1, y1, y2, boundary, isInside)) continue;
                else // Otherwise, find the label width
                textWidth = (0, _vegaScenegraph.textMetrics).width(d.datum, d.datum.text);
            }
            xc = x1 + insideFactor * textWidth * dx / 2;
            x1 = xc - textWidth / 2;
            x2 = xc + textWidth / 2;
            _x1 = $(x1);
            _x2 = $(x2);
            if (test(_x1, _x2, _y1, _y2, bm0, bm1, x1, x2, y1, y2, boundary, isInside)) {
                // place label if the position is placeable
                d.x = !dx ? xc : dx * insideFactor < 0 ? x2 : x1;
                d.y = !dy ? yc : dy * insideFactor < 0 ? y2 : y1;
                d.align = Aligns[dx * insideFactor + 1];
                d.baseline = Baselines[dy * insideFactor + 1];
                bm0.setRange(_x1, _y1, _x2, _y2);
                return true;
            }
        }
        return false;
    };
} // Test if a label with the given dimensions can be added without overlap
function test(_x1, _x2, _y1, _y2, bm0, bm1, x1, x2, y1, y2, boundary, isInside) {
    return !(bm0.outOfBounds(_x1, _y1, _x2, _y2) || (isInside && bm1 ? bm1.getRange(_x1, _y1, _x2, _y2) || !isInMarkBound(x1, y1, x2, y2, boundary) : bm0.getRange(_x1, _y1, _x2, _y2)));
}