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Move the x_label below the item detail label if they overlap near the top of the chart #502

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Move the x_label below the item detail label if they overlap near the top of the chart #502

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41 changes: 41 additions & 0 deletions src/js/Rickshaw.Graph.HoverDetail.js
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Original file line number Diff line number Diff line change
Expand Up @@ -223,6 +223,25 @@ Rickshaw.Graph.HoverDetail = Rickshaw.Class.create({
}
}

var collisions = this._calcLayoutCollisions(alignables);
if (collisions.length !== 0) {
// There's a collision between the item and x_label.
// This happens when a datapoint appears near the top of the chart.
// The item and x_label are aligned horizontally so to avoid the collision
// we move the x_label below the item.

var parentRect = this.element.parentNode.getBoundingClientRect();
var itemRect = item.getBoundingClientRect();
// The following assumes that the x_label is positioned absolutely
// with respect its parent element.

// To move the x_label above the item use the following position instead:
// xlabelRect = xLabel.getBoundingClientRect();
// topPosition = itemRect.top - (xlabelRect.bottom - xlabelRect.top) - parentRect.top;
var topPosition = itemRect.bottom - parentRect.top;
xLabel.style.top = topPosition + "px";
}

if (typeof this.onRender == 'function') {
this.onRender(args);
}
Expand Down Expand Up @@ -251,6 +270,28 @@ Rickshaw.Graph.HoverDetail = Rickshaw.Class.create({
return error;
},

_calcLayoutCollisions: function(alignables) {
// return pairs of elements among alignables that overlap
var collisions = [];
var a1, a2, r1, r2;

for (var i=0; i<alignables.length; i++) {
a1 = alignables[i];
r1 = a1.getBoundingClientRect();
for (var j=i+1; j<alignables.length; j++) {
a2 = alignables[j];
r2 = a2.getBoundingClientRect();
if (!(r1.right < r2.left ||
r1.left > r2.right ||
r1.bottom < r2.top ||
r1.top > r2.bottom)) {
collisions.push([a1, a2]);
}
}
}
return collisions;
},

_addListeners: function() {

this.graph.element.addEventListener(
Expand Down