/**
|
* @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
|
*/
|
/**
|
* EXPERIMENTAL Highcharts module to place labels next to a series in a natural position.
|
*
|
* TODO:
|
* - add column support (box collision detection, boxesToAvoid logic)
|
* - other series types, area etc.
|
* - avoid data labels, when data labels above, show series label below.
|
* - add more options (connector, format, formatter)
|
*
|
* http://jsfiddle.net/highcharts/L2u9rpwr/
|
* http://jsfiddle.net/highcharts/y5A37/
|
* http://jsfiddle.net/highcharts/264Nm/
|
* http://jsfiddle.net/highcharts/y5A37/
|
*/
|
|
'use strict';
|
|
var labelDistance = 3,
|
wrap = H.wrap,
|
each = H.each,
|
extend = H.extend,
|
isNumber = H.isNumber,
|
Series = H.Series,
|
SVGRenderer = H.SVGRenderer,
|
Chart = H.Chart;
|
|
H.setOptions({
|
plotOptions: {
|
series: {
|
label: {
|
enabled: true,
|
// Allow labels to be placed distant to the graph if necessary, and
|
// draw a connector line to the graph
|
connectorAllowed: true,
|
connectorNeighbourDistance: 24, // If the label is closer than this to a neighbour graph, draw a connector
|
styles: {
|
fontWeight: 'bold'
|
}
|
// boxesToAvoid: []
|
}
|
}
|
}
|
});
|
|
/**
|
* Counter-clockwise, part of the fast line intersection logic
|
*/
|
function ccw(x1, y1, x2, y2, x3, y3) {
|
var cw = ((y3 - y1) * (x2 - x1)) - ((y2 - y1) * (x3 - x1));
|
return cw > 0 ? true : cw < 0 ? false : true;
|
}
|
|
/**
|
* Detect if two lines intersect
|
*/
|
function intersectLine(x1, y1, x2, y2, x3, y3, x4, y4) {
|
return ccw(x1, y1, x3, y3, x4, y4) !== ccw(x2, y2, x3, y3, x4, y4) &&
|
ccw(x1, y1, x2, y2, x3, y3) !== ccw(x1, y1, x2, y2, x4, y4);
|
}
|
|
/**
|
* Detect if a box intersects with a line
|
*/
|
function boxIntersectLine(x, y, w, h, x1, y1, x2, y2) {
|
return (
|
intersectLine(x, y, x + w, y, x1, y1, x2, y2) || // top of label
|
intersectLine(x + w, y, x + w, y + h, x1, y1, x2, y2) || // right of label
|
intersectLine(x, y + h, x + w, y + h, x1, y1, x2, y2) || // bottom of label
|
intersectLine(x, y, x, y + h, x1, y1, x2, y2) // left of label
|
);
|
}
|
|
/**
|
* General symbol definition for labels with connector
|
*/
|
SVGRenderer.prototype.symbols.connector = function(x, y, w, h, options) {
|
var anchorX = options && options.anchorX,
|
anchorY = options && options.anchorY,
|
path,
|
yOffset,
|
lateral = w / 2;
|
|
if (isNumber(anchorX) && isNumber(anchorY)) {
|
|
path = ['M', anchorX, anchorY];
|
|
// Prefer 45 deg connectors
|
yOffset = y - anchorY;
|
if (yOffset < 0) {
|
yOffset = -h - yOffset;
|
}
|
if (yOffset < w) {
|
lateral = anchorX < x + (w / 2) ? yOffset : w - yOffset;
|
}
|
|
// Anchor below label
|
if (anchorY > y + h) {
|
path.push('L', x + lateral, y + h);
|
|
// Anchor above label
|
} else if (anchorY < y) {
|
path.push('L', x + lateral, y);
|
|
// Anchor left of label
|
} else if (anchorX < x) {
|
path.push('L', x, y + h / 2);
|
|
// Anchor right of label
|
} else if (anchorX > x + w) {
|
path.push('L', x + w, y + h / 2);
|
}
|
}
|
return path || [];
|
};
|
|
/**
|
* Points to avoid. In addition to actual data points, the label should avoid
|
* interpolated positions.
|
*/
|
Series.prototype.getPointsOnGraph = function() {
|
var distance = 16,
|
points = this.points,
|
point,
|
last,
|
interpolated = [],
|
i,
|
deltaX,
|
deltaY,
|
delta,
|
len,
|
n,
|
j,
|
d,
|
graph = this.graph || this.area,
|
node = graph.element,
|
inverted = this.chart.inverted,
|
paneLeft = inverted ? this.yAxis.pos : this.xAxis.pos,
|
paneTop = inverted ? this.xAxis.pos : this.yAxis.pos;
|
|
// For splines, get the point at length (possible caveat: peaks are not correctly detected)
|
if (this.getPointSpline && node.getPointAtLength) {
|
// If it is animating towards a path definition, use that briefly, and reset
|
if (graph.toD) {
|
d = graph.attr('d');
|
graph.attr({
|
d: graph.toD
|
});
|
}
|
len = node.getTotalLength();
|
for (i = 0; i < len; i += distance) {
|
point = node.getPointAtLength(i);
|
interpolated.push({
|
chartX: paneLeft + point.x,
|
chartY: paneTop + point.y,
|
plotX: point.x,
|
plotY: point.y
|
});
|
}
|
if (d) {
|
graph.attr({
|
d: d
|
});
|
}
|
// Last point
|
point = points[points.length - 1];
|
point.chartX = paneLeft + point.plotX;
|
point.chartY = paneTop + point.plotY;
|
interpolated.push(point);
|
|
// Interpolate
|
} else {
|
len = points.length;
|
for (i = 0; i < len; i += 1) {
|
|
point = points[i];
|
last = points[i - 1];
|
|
// Absolute coordinates so we can compare different panes
|
point.chartX = paneLeft + point.plotX;
|
point.chartY = paneTop + point.plotY;
|
|
// Add interpolated points
|
if (i > 0) {
|
deltaX = Math.abs(point.chartX - last.chartX);
|
deltaY = Math.abs(point.chartY - last.chartY);
|
delta = Math.max(deltaX, deltaY);
|
if (delta > distance) {
|
|
n = Math.ceil(delta / distance);
|
|
for (j = 1; j < n; j += 1) {
|
interpolated.push({
|
chartX: last.chartX + (point.chartX - last.chartX) * (j / n),
|
chartY: last.chartY + (point.chartY - last.chartY) * (j / n),
|
plotX: last.plotX + (point.plotX - last.plotX) * (j / n),
|
plotY: last.plotY + (point.plotY - last.plotY) * (j / n)
|
});
|
}
|
}
|
}
|
|
// Add the real point in order to find positive and negative peaks
|
if (isNumber(point.plotY)) {
|
interpolated.push(point);
|
}
|
}
|
}
|
return interpolated;
|
};
|
|
/**
|
* Check whether a proposed label position is clear of other elements
|
*/
|
Series.prototype.checkClearPoint = function(x, y, bBox, checkDistance) {
|
var distToOthersSquared = Number.MAX_VALUE, // distance to other graphs
|
distToPointSquared = Number.MAX_VALUE,
|
dist,
|
connectorPoint,
|
connectorEnabled = this.options.label.connectorAllowed,
|
|
chart = this.chart,
|
series,
|
points,
|
leastDistance = 16,
|
withinRange,
|
i,
|
j;
|
|
function intersectRect(r1, r2) {
|
return !(r2.left > r1.right ||
|
r2.right < r1.left ||
|
r2.top > r1.bottom ||
|
r2.bottom < r1.top);
|
}
|
|
/**
|
* Get the weight in order to determine the ideal position. Larger distance to
|
* other series gives more weight. Smaller distance to the actual point (connector points only)
|
* gives more weight.
|
*/
|
function getWeight(distToOthersSquared, distToPointSquared) {
|
return distToOthersSquared - distToPointSquared;
|
}
|
|
// First check for collision with existing labels
|
for (i = 0; i < chart.boxesToAvoid.length; i += 1) {
|
if (intersectRect(chart.boxesToAvoid[i], {
|
left: x,
|
right: x + bBox.width,
|
top: y,
|
bottom: y + bBox.height
|
})) {
|
return false;
|
}
|
}
|
|
// For each position, check if the lines around the label intersect with any of the
|
// graphs
|
for (i = 0; i < chart.series.length; i += 1) {
|
series = chart.series[i];
|
points = series.interpolatedPoints;
|
if (series.visible && points) {
|
for (j = 1; j < points.length; j += 1) {
|
// If any of the box sides intersect with the line, return
|
if (boxIntersectLine(
|
x,
|
y,
|
bBox.width,
|
bBox.height,
|
points[j - 1].chartX,
|
points[j - 1].chartY,
|
points[j].chartX,
|
points[j].chartY
|
)) {
|
return false;
|
}
|
|
// But if it is too far away (a padded box doesn't intersect), also return
|
if (this === series && !withinRange && checkDistance) {
|
withinRange = boxIntersectLine(
|
x - leastDistance,
|
y - leastDistance,
|
bBox.width + 2 * leastDistance,
|
bBox.height + 2 * leastDistance,
|
points[j - 1].chartX,
|
points[j - 1].chartY,
|
points[j].chartX,
|
points[j].chartY
|
);
|
}
|
|
// Find the squared distance from the center of the label
|
if (this !== series) {
|
distToOthersSquared = Math.min(
|
distToOthersSquared,
|
Math.pow(x + bBox.width / 2 - points[j].chartX, 2) + Math.pow(y + bBox.height / 2 - points[j].chartY, 2),
|
Math.pow(x - points[j].chartX, 2) + Math.pow(y - points[j].chartY, 2),
|
Math.pow(x + bBox.width - points[j].chartX, 2) + Math.pow(y - points[j].chartY, 2),
|
Math.pow(x + bBox.width - points[j].chartX, 2) + Math.pow(y + bBox.height - points[j].chartY, 2),
|
Math.pow(x - points[j].chartX, 2) + Math.pow(y + bBox.height - points[j].chartY, 2)
|
);
|
}
|
}
|
|
// Do we need a connector?
|
if (connectorEnabled && this === series && ((checkDistance && !withinRange) ||
|
distToOthersSquared < Math.pow(this.options.label.connectorNeighbourDistance, 2))) {
|
for (j = 1; j < points.length; j += 1) {
|
dist = Math.min(
|
Math.pow(x + bBox.width / 2 - points[j].chartX, 2) + Math.pow(y + bBox.height / 2 - points[j].chartY, 2),
|
Math.pow(x - points[j].chartX, 2) + Math.pow(y - points[j].chartY, 2),
|
Math.pow(x + bBox.width - points[j].chartX, 2) + Math.pow(y - points[j].chartY, 2),
|
Math.pow(x + bBox.width - points[j].chartX, 2) + Math.pow(y + bBox.height - points[j].chartY, 2),
|
Math.pow(x - points[j].chartX, 2) + Math.pow(y + bBox.height - points[j].chartY, 2)
|
);
|
if (dist < distToPointSquared) {
|
distToPointSquared = dist;
|
connectorPoint = points[j];
|
}
|
}
|
withinRange = true;
|
}
|
}
|
}
|
|
return !checkDistance || withinRange ? {
|
x: x,
|
y: y,
|
weight: getWeight(distToOthersSquared, connectorPoint ? distToPointSquared : 0),
|
connectorPoint: connectorPoint
|
} : false;
|
|
};
|
|
/**
|
* The main initiator method that runs on chart level after initiation and redraw. It runs in
|
* a timeout to prevent locking, and loops over all series, taking all series and labels into
|
* account when placing the labels.
|
*/
|
Chart.prototype.drawSeriesLabels = function() {
|
var chart = this,
|
labelSeries = this.labelSeries;
|
|
chart.boxesToAvoid = [];
|
|
// Build the interpolated points
|
each(labelSeries, function(series) {
|
series.interpolatedPoints = series.getPointsOnGraph();
|
|
each(series.options.label.boxesToAvoid || [], function(box) {
|
chart.boxesToAvoid.push(box);
|
});
|
});
|
|
each(chart.series, function(series) {
|
var bBox,
|
x,
|
y,
|
results = [],
|
clearPoint,
|
i,
|
best,
|
inverted = chart.inverted,
|
paneLeft = inverted ? series.yAxis.pos : series.xAxis.pos,
|
paneTop = inverted ? series.xAxis.pos : series.yAxis.pos,
|
paneWidth = chart.inverted ? series.yAxis.len : series.xAxis.len,
|
paneHeight = chart.inverted ? series.xAxis.len : series.yAxis.len,
|
points = series.interpolatedPoints,
|
label = series.labelBySeries;
|
|
function insidePane(x, y, bBox) {
|
return x > paneLeft && x <= paneLeft + paneWidth - bBox.width &&
|
y >= paneTop && y <= paneTop + paneHeight - bBox.height;
|
}
|
|
if (series.visible && points) {
|
if (!label) {
|
series.labelBySeries = label = chart.renderer
|
.label(series.name, 0, -9999, 'connector')
|
.css(extend({
|
color: series.color
|
}, series.options.label.styles))
|
.attr({
|
padding: 0,
|
opacity: 0,
|
stroke: series.color,
|
'stroke-width': 1
|
})
|
.add(series.group)
|
.animate({
|
opacity: 1
|
}, {
|
duration: 200
|
});
|
}
|
|
bBox = label.getBBox();
|
bBox.width = Math.round(bBox.width);
|
|
// Ideal positions are centered above or below a point on right side
|
// of chart
|
for (i = points.length - 1; i > 0; i -= 1) {
|
|
// Right - up
|
x = points[i].chartX + labelDistance;
|
y = points[i].chartY - bBox.height - labelDistance;
|
if (insidePane(x, y, bBox)) {
|
best = series.checkClearPoint(
|
x,
|
y,
|
bBox
|
);
|
}
|
if (best) {
|
results.push(best);
|
}
|
|
// Right - down
|
x = points[i].chartX + labelDistance;
|
y = points[i].chartY + labelDistance;
|
if (insidePane(x, y, bBox)) {
|
best = series.checkClearPoint(
|
x,
|
y,
|
bBox
|
);
|
}
|
if (best) {
|
results.push(best);
|
}
|
|
// Left - down
|
x = points[i].chartX - bBox.width - labelDistance;
|
y = points[i].chartY + labelDistance;
|
if (insidePane(x, y, bBox)) {
|
best = series.checkClearPoint(
|
x,
|
y,
|
bBox
|
);
|
}
|
if (best) {
|
results.push(best);
|
}
|
|
// Left - up
|
x = points[i].chartX - bBox.width - labelDistance;
|
y = points[i].chartY - bBox.height - labelDistance;
|
if (insidePane(x, y, bBox)) {
|
best = series.checkClearPoint(
|
x,
|
y,
|
bBox
|
);
|
}
|
if (best) {
|
results.push(best);
|
}
|
|
}
|
|
// Brute force, try all positions on the chart in a 16x16 grid
|
if (!results.length) {
|
for (x = paneLeft + paneWidth - bBox.width; x >= paneLeft; x -= 16) {
|
for (y = paneTop; y < paneTop + paneHeight - bBox.height; y += 16) {
|
clearPoint = series.checkClearPoint(x, y, bBox, true);
|
if (clearPoint) {
|
results.push(clearPoint);
|
}
|
}
|
}
|
}
|
|
if (results.length) {
|
|
results.sort(function(a, b) {
|
return b.weight - a.weight;
|
});
|
|
best = results[0];
|
|
chart.boxesToAvoid.push({
|
left: best.x,
|
right: best.x + bBox.width,
|
top: best.y,
|
bottom: best.y + bBox.height
|
});
|
|
// Move it if needed
|
if (Math.round(best.x) !== Math.round(label.x) ||
|
Math.round(best.y) !== Math.round(label.y)) {
|
series.labelBySeries
|
.attr({
|
opacity: 0,
|
x: best.x - paneLeft,
|
y: best.y - paneTop,
|
anchorX: best.connectorPoint && best.connectorPoint.plotX,
|
anchorY: best.connectorPoint && best.connectorPoint.plotY
|
})
|
.animate({
|
opacity: 1
|
});
|
|
// Record closest point to stick to for sync redraw
|
series.options.kdNow = true;
|
series.buildKDTree();
|
var closest = series.searchPoint({
|
chartX: best.x,
|
chartY: best.y
|
}, true);
|
label.closest = [
|
closest,
|
best.x - paneLeft - closest.plotX,
|
best.y - paneTop - closest.plotY
|
];
|
|
}
|
|
} else if (label) {
|
series.labelBySeries = label.destroy();
|
}
|
}
|
});
|
};
|
|
/**
|
* Prepare drawing series labels
|
*/
|
function drawLabels(proceed) {
|
|
var chart = this,
|
delay = Math.max(
|
H.animObject(chart.renderer.globalAnimation).duration,
|
250
|
),
|
initial = !chart.hasRendered;
|
|
proceed.apply(chart, [].slice.call(arguments, 1));
|
|
chart.labelSeries = [];
|
|
clearTimeout(chart.seriesLabelTimer);
|
|
// Which series should have labels
|
each(chart.series, function(series) {
|
var options = series.options.label,
|
label = series.labelBySeries,
|
closest = label && label.closest;
|
|
if (options.enabled && series.visible && (series.graph || series.area)) {
|
chart.labelSeries.push(series);
|
|
// The labels are processing heavy, wait until the animation is done
|
if (initial) {
|
delay = Math.max(
|
delay,
|
H.animObject(series.options.animation).duration
|
);
|
}
|
|
// Keep the position updated to the axis while redrawing
|
if (closest) {
|
if (closest[0].plotX !== undefined) {
|
label.animate({
|
x: closest[0].plotX + closest[1],
|
y: closest[0].plotY + closest[2]
|
});
|
} else {
|
label.attr({
|
opacity: 0
|
});
|
}
|
}
|
}
|
});
|
|
chart.seriesLabelTimer = setTimeout(function() {
|
chart.drawSeriesLabels();
|
}, delay);
|
|
}
|
wrap(Chart.prototype, 'render', drawLabels);
|
wrap(Chart.prototype, 'redraw', drawLabels);
|
|
}(Highcharts));
|
}));
|
