Function expandMargin

src/components/legend/draw.js:1089–1128

(gd, legendId, lx, ly)

}

function expandMargin(gd, legendId, lx, ly) {
    var fullLayout = gd._fullLayout;
    var legendObj = fullLayout[legendId];
    var xanchor = getXanchor(legendObj);
    var yanchor = getYanchor(legendObj);

    var isPaperX = legendObj.xref === 'paper';
    var isPaperY = legendObj.yref === 'paper';

    gd._fullLayout._reservedMargin[legendId] = {};
    var sideY = legendObj.y < 0.5 ? 'b' : 't';
    var sideX = legendObj.x < 0.5 ? 'l' : 'r';
    var possibleReservedMargins = {
        r: (fullLayout.width - lx),
        l: lx + legendObj._width,
        b: (fullLayout.height - ly),
        t: ly + legendObj._effHeight
    };

    if(isPaperX && isPaperY) {
        return Plots.autoMargin(gd, legendId, {
            x: legendObj.x,
            y: legendObj.y,
            l: legendObj._width * (FROM_TL[xanchor]),
            r: legendObj._width * (FROM_BR[xanchor]),
            b: legendObj._effHeight * (FROM_BR[yanchor]),
            t: legendObj._effHeight * (FROM_TL[yanchor])
        });
    } else if(isPaperX) {
        gd._fullLayout._reservedMargin[legendId][sideY] = possibleReservedMargins[sideY];
    } else if(isPaperY) {
        gd._fullLayout._reservedMargin[legendId][sideX] = possibleReservedMargins[sideX];
    } else {
        if(legendObj.orientation === 'v') {
            gd._fullLayout._reservedMargin[legendId][sideX] = possibleReservedMargins[sideX];
        } else {
            gd._fullLayout._reservedMargin[legendId][sideY] = possibleReservedMargins[sideY];
        }
    }
}

function getXanchor(legendObj) {
    return Lib.isRightAnchor(legendObj) ? 'right' :