Function calcLinks

src/plots/cartesian/dragbox.js:1246–1332

(gd, groups, xaHash, yaHash, exclude)

}

function calcLinks(gd, groups, xaHash, yaHash, exclude) {
    var isSubplotConstrained = false;
    var xLinks = {};
    var yLinks = {};
    var xID, yID, xLinkID, yLinkID;
    var xExclude = (exclude || {}).xaHash;
    var yExclude = (exclude || {}).yaHash;

    for(var i = 0; i < groups.length; i++) {
        var group = groups[i];
        // check if any of the x axes we're dragging is in this constraint group
        for(xID in xaHash) {
            if(group[xID]) {
                // put the rest of these axes into xLinks, if we're not already
                // dragging them, so we know to scale these axes automatically too
                // to match the changes in the dragged x axes
                for(xLinkID in group) {
                    if(
                        !(exclude && (xExclude[xLinkID] || yExclude[xLinkID])) &&
                        !(xLinkID.charAt(0) === 'x' ? xaHash : yaHash)[xLinkID]
                    ) {
                        xLinks[xLinkID] = xID;
                    }
                }

                // check if the x and y axes of THIS drag are linked
                for(yID in yaHash) {
                    if(
                        !(exclude && (xExclude[yID] || yExclude[yID])) &&
                        group[yID]
                    ) {
                        isSubplotConstrained = true;
                    }
                }
            }
        }

        // now check if any of the y axes we're dragging is in this constraint group
        // only look for outside links, as we've already checked for links within the dragger
        for(yID in yaHash) {
            if(group[yID]) {
                for(yLinkID in group) {
                    if(
                        !(exclude && (xExclude[yLinkID] || yExclude[yLinkID])) &&
                        !(yLinkID.charAt(0) === 'x' ? xaHash : yaHash)[yLinkID]
                    ) {
                        yLinks[yLinkID] = yID;
                    }
                }
            }
        }
    }

    if(isSubplotConstrained) {
        // merge xLinks and yLinks if the subplot is constrained,
        // since we'll always apply both anyway and the two will contain
        // duplicates
        Lib.extendFlat(xLinks, yLinks);