overlapping-datalabels.src.js
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/**
* @license Highcharts JS v5.0.6 (2016-12-07)
*
* (c) 2009-2016 Torstein Honsi
*
* License: www.highcharts.com/license
*/
(function(factory) {
if (typeof module === 'object' && module.exports) {
module.exports = factory;
} else {
factory(Highcharts);
}
}(function(Highcharts) {
(function(H) {
/**
* (c) 2009-2016 Torstein Honsi
*
* License: www.highcharts.com/license
*/
'use strict';
/**
* Highcharts module to hide overlapping data labels. This module is included in Highcharts.
*/
var Chart = H.Chart,
each = H.each,
pick = H.pick,
addEvent = H.addEvent;
// Collect potensial overlapping data labels. Stack labels probably don't need to be
// considered because they are usually accompanied by data labels that lie inside the columns.
Chart.prototype.callbacks.push(function(chart) {
function collectAndHide() {
var labels = [];
each(chart.series, function(series) {
var dlOptions = series.options.dataLabels,
collections = series.dataLabelCollections || ['dataLabel']; // Range series have two collections
if ((dlOptions.enabled || series._hasPointLabels) && !dlOptions.allowOverlap && series.visible) { // #3866
each(collections, function(coll) {
each(series.points, function(point) {
if (point[coll]) {
point[coll].labelrank = pick(point.labelrank, point.shapeArgs && point.shapeArgs.height); // #4118
labels.push(point[coll]);
}
});
});
}
});
chart.hideOverlappingLabels(labels);
}
// Do it now ...
collectAndHide();
// ... and after each chart redraw
addEvent(chart, 'redraw', collectAndHide);
});
/**
* Hide overlapping labels. Labels are moved and faded in and out on zoom to provide a smooth
* visual imression.
*/
Chart.prototype.hideOverlappingLabels = function(labels) {
var len = labels.length,
label,
i,
j,
label1,
label2,
isIntersecting,
pos1,
pos2,
parent1,
parent2,
padding,
intersectRect = function(x1, y1, w1, h1, x2, y2, w2, h2) {
return !(
x2 > x1 + w1 ||
x2 + w2 < x1 ||
y2 > y1 + h1 ||
y2 + h2 < y1
);
};
// Mark with initial opacity
for (i = 0; i < len; i++) {
label = labels[i];
if (label) {
label.oldOpacity = label.opacity;
label.newOpacity = 1;
}
}
// Prevent a situation in a gradually rising slope, that each label
// will hide the previous one because the previous one always has
// lower rank.
labels.sort(function(a, b) {
return (b.labelrank || 0) - (a.labelrank || 0);
});
// Detect overlapping labels
for (i = 0; i < len; i++) {
label1 = labels[i];
for (j = i + 1; j < len; ++j) {
label2 = labels[j];
if (label1 && label2 && label1.placed && label2.placed && label1.newOpacity !== 0 && label2.newOpacity !== 0) {
pos1 = label1.alignAttr;
pos2 = label2.alignAttr;
parent1 = label1.parentGroup; // Different panes have different positions
parent2 = label2.parentGroup;
padding = 2 * (label1.box ? 0 : label1.padding); // Substract the padding if no background or border (#4333)
isIntersecting = intersectRect(
pos1.x + parent1.translateX,
pos1.y + parent1.translateY,
label1.width - padding,
label1.height - padding,
pos2.x + parent2.translateX,
pos2.y + parent2.translateY,
label2.width - padding,
label2.height - padding
);
if (isIntersecting) {
(label1.labelrank < label2.labelrank ? label1 : label2).newOpacity = 0;
}
}
}
}
// Hide or show
each(labels, function(label) {
var complete,
newOpacity;
if (label) {
newOpacity = label.newOpacity;
if (label.oldOpacity !== newOpacity && label.placed) {
// Make sure the label is completely hidden to avoid catching clicks (#4362)
if (newOpacity) {
label.show(true);
} else {
complete = function() {
label.hide();
};
}
// Animate or set the opacity
label.alignAttr.opacity = newOpacity;
label[label.isOld ? 'animate' : 'attr'](label.alignAttr, null, complete);
}
label.isOld = true;
}
});
};
}(Highcharts));
}));