545 lines
22 KiB
JavaScript
545 lines
22 KiB
JavaScript
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/**
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* @license Highcharts JS v5.0.2 (2016-10-26)
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*
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* (c) 2009-2016 Torstein Honsi
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*
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* License: www.highcharts.com/license
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*/
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(function(factory) {
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if (typeof module === 'object' && module.exports) {
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module.exports = factory;
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} else {
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factory(Highcharts);
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}
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}(function(Highcharts) {
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(function(H) {
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/**
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* (c) 2009-2016 Torstein Honsi
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*
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* License: www.highcharts.com/license
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*/
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/**
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* EXPERIMENTAL Highcharts module to place labels next to a series in a natural position.
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*
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* TODO:
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* - add column support (box collision detection, boxesToAvoid logic)
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* - other series types, area etc.
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* - avoid data labels, when data labels above, show series label below.
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* - add more options (connector, format, formatter)
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*
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* http://jsfiddle.net/highcharts/L2u9rpwr/
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* http://jsfiddle.net/highcharts/y5A37/
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* http://jsfiddle.net/highcharts/264Nm/
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* http://jsfiddle.net/highcharts/y5A37/
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*/
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'use strict';
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var labelDistance = 3,
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wrap = H.wrap,
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each = H.each,
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extend = H.extend,
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isNumber = H.isNumber,
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Series = H.Series,
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SVGRenderer = H.SVGRenderer,
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Chart = H.Chart;
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H.setOptions({
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plotOptions: {
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series: {
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label: {
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enabled: true,
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// Allow labels to be placed distant to the graph if necessary, and
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// draw a connector line to the graph
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connectorAllowed: true,
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connectorNeighbourDistance: 24, // If the label is closer than this to a neighbour graph, draw a connector
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styles: {
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fontWeight: 'bold'
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}
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// boxesToAvoid: []
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}
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}
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}
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});
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/**
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* Counter-clockwise, part of the fast line intersection logic
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*/
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function ccw(x1, y1, x2, y2, x3, y3) {
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var cw = ((y3 - y1) * (x2 - x1)) - ((y2 - y1) * (x3 - x1));
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return cw > 0 ? true : cw < 0 ? false : true;
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}
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/**
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* Detect if two lines intersect
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*/
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function intersectLine(x1, y1, x2, y2, x3, y3, x4, y4) {
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return ccw(x1, y1, x3, y3, x4, y4) !== ccw(x2, y2, x3, y3, x4, y4) &&
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ccw(x1, y1, x2, y2, x3, y3) !== ccw(x1, y1, x2, y2, x4, y4);
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}
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/**
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* Detect if a box intersects with a line
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*/
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function boxIntersectLine(x, y, w, h, x1, y1, x2, y2) {
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return (
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intersectLine(x, y, x + w, y, x1, y1, x2, y2) || // top of label
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intersectLine(x + w, y, x + w, y + h, x1, y1, x2, y2) || // right of label
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intersectLine(x, y + h, x + w, y + h, x1, y1, x2, y2) || // bottom of label
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intersectLine(x, y, x, y + h, x1, y1, x2, y2) // left of label
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);
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}
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/**
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* General symbol definition for labels with connector
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*/
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SVGRenderer.prototype.symbols.connector = function(x, y, w, h, options) {
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var anchorX = options && options.anchorX,
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anchorY = options && options.anchorY,
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path,
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yOffset,
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lateral = w / 2;
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if (isNumber(anchorX) && isNumber(anchorY)) {
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path = ['M', anchorX, anchorY];
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// Prefer 45 deg connectors
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yOffset = y - anchorY;
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if (yOffset < 0) {
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yOffset = -h - yOffset;
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}
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if (yOffset < w) {
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lateral = anchorX < x + (w / 2) ? yOffset : w - yOffset;
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}
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// Anchor below label
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if (anchorY > y + h) {
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path.push('L', x + lateral, y + h);
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// Anchor above label
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} else if (anchorY < y) {
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path.push('L', x + lateral, y);
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// Anchor left of label
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} else if (anchorX < x) {
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path.push('L', x, y + h / 2);
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// Anchor right of label
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} else if (anchorX > x + w) {
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path.push('L', x + w, y + h / 2);
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}
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}
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return path || [];
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};
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/**
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* Points to avoid. In addition to actual data points, the label should avoid
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* interpolated positions.
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*/
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Series.prototype.getPointsOnGraph = function() {
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var distance = 16,
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points = this.points,
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point,
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last,
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interpolated = [],
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i,
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deltaX,
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deltaY,
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delta,
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len,
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n,
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j,
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d,
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graph = this.graph || this.area,
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node = graph.element,
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inverted = this.chart.inverted,
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paneLeft = inverted ? this.yAxis.pos : this.xAxis.pos,
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paneTop = inverted ? this.xAxis.pos : this.yAxis.pos;
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// For splines, get the point at length (possible caveat: peaks are not correctly detected)
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if (this.getPointSpline && node.getPointAtLength) {
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// If it is animating towards a path definition, use that briefly, and reset
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if (graph.toD) {
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d = graph.attr('d');
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graph.attr({
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d: graph.toD
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});
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}
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len = node.getTotalLength();
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for (i = 0; i < len; i += distance) {
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point = node.getPointAtLength(i);
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interpolated.push({
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chartX: paneLeft + point.x,
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chartY: paneTop + point.y,
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plotX: point.x,
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plotY: point.y
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});
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}
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if (d) {
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graph.attr({
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d: d
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});
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}
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// Last point
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point = points[points.length - 1];
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point.chartX = paneLeft + point.plotX;
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point.chartY = paneTop + point.plotY;
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interpolated.push(point);
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// Interpolate
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} else {
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len = points.length;
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for (i = 0; i < len; i += 1) {
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point = points[i];
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last = points[i - 1];
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// Absolute coordinates so we can compare different panes
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point.chartX = paneLeft + point.plotX;
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point.chartY = paneTop + point.plotY;
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// Add interpolated points
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if (i > 0) {
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deltaX = Math.abs(point.chartX - last.chartX);
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deltaY = Math.abs(point.chartY - last.chartY);
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delta = Math.max(deltaX, deltaY);
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if (delta > distance) {
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n = Math.ceil(delta / distance);
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for (j = 1; j < n; j += 1) {
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interpolated.push({
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chartX: last.chartX + (point.chartX - last.chartX) * (j / n),
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chartY: last.chartY + (point.chartY - last.chartY) * (j / n),
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plotX: last.plotX + (point.plotX - last.plotX) * (j / n),
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plotY: last.plotY + (point.plotY - last.plotY) * (j / n)
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});
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}
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}
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}
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// Add the real point in order to find positive and negative peaks
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if (isNumber(point.plotY)) {
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interpolated.push(point);
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}
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}
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}
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return interpolated;
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};
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/**
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* Check whether a proposed label position is clear of other elements
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*/
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Series.prototype.checkClearPoint = function(x, y, bBox, checkDistance) {
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var distToOthersSquared = Number.MAX_VALUE, // distance to other graphs
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distToPointSquared = Number.MAX_VALUE,
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dist,
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connectorPoint,
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connectorEnabled = this.options.label.connectorAllowed,
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chart = this.chart,
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series,
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points,
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leastDistance = 16,
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withinRange,
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i,
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j;
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function intersectRect(r1, r2) {
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return !(r2.left > r1.right ||
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r2.right < r1.left ||
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r2.top > r1.bottom ||
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r2.bottom < r1.top);
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}
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/**
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* Get the weight in order to determine the ideal position. Larger distance to
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* other series gives more weight. Smaller distance to the actual point (connector points only)
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* gives more weight.
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*/
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function getWeight(distToOthersSquared, distToPointSquared) {
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return distToOthersSquared - distToPointSquared;
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}
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// First check for collision with existing labels
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for (i = 0; i < chart.boxesToAvoid.length; i += 1) {
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if (intersectRect(chart.boxesToAvoid[i], {
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left: x,
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right: x + bBox.width,
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top: y,
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bottom: y + bBox.height
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})) {
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return false;
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}
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}
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// For each position, check if the lines around the label intersect with any of the
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// graphs
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for (i = 0; i < chart.series.length; i += 1) {
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series = chart.series[i];
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points = series.interpolatedPoints;
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if (series.visible && points) {
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for (j = 1; j < points.length; j += 1) {
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// If any of the box sides intersect with the line, return
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if (boxIntersectLine(
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x,
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y,
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bBox.width,
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bBox.height,
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points[j - 1].chartX,
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points[j - 1].chartY,
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points[j].chartX,
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points[j].chartY
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)) {
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return false;
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}
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// But if it is too far away (a padded box doesn't intersect), also return
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if (this === series && !withinRange && checkDistance) {
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withinRange = boxIntersectLine(
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x - leastDistance,
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y - leastDistance,
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bBox.width + 2 * leastDistance,
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bBox.height + 2 * leastDistance,
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points[j - 1].chartX,
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points[j - 1].chartY,
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points[j].chartX,
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points[j].chartY
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);
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}
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// Find the squared distance from the center of the label
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if (this !== series) {
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distToOthersSquared = Math.min(
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distToOthersSquared,
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Math.pow(x + bBox.width / 2 - points[j].chartX, 2) + Math.pow(y + bBox.height / 2 - points[j].chartY, 2),
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Math.pow(x - points[j].chartX, 2) + Math.pow(y - points[j].chartY, 2),
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Math.pow(x + bBox.width - points[j].chartX, 2) + Math.pow(y - points[j].chartY, 2),
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Math.pow(x + bBox.width - points[j].chartX, 2) + Math.pow(y + bBox.height - points[j].chartY, 2),
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Math.pow(x - points[j].chartX, 2) + Math.pow(y + bBox.height - points[j].chartY, 2)
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);
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}
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}
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// Do we need a connector?
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if (connectorEnabled && this === series && ((checkDistance && !withinRange) ||
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distToOthersSquared < Math.pow(this.options.label.connectorNeighbourDistance, 2))) {
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for (j = 1; j < points.length; j += 1) {
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dist = Math.min(
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Math.pow(x + bBox.width / 2 - points[j].chartX, 2) + Math.pow(y + bBox.height / 2 - points[j].chartY, 2),
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Math.pow(x - points[j].chartX, 2) + Math.pow(y - points[j].chartY, 2),
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Math.pow(x + bBox.width - points[j].chartX, 2) + Math.pow(y - points[j].chartY, 2),
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Math.pow(x + bBox.width - points[j].chartX, 2) + Math.pow(y + bBox.height - points[j].chartY, 2),
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Math.pow(x - points[j].chartX, 2) + Math.pow(y + bBox.height - points[j].chartY, 2)
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);
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if (dist < distToPointSquared) {
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distToPointSquared = dist;
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connectorPoint = points[j];
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}
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}
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withinRange = true;
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}
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}
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}
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return !checkDistance || withinRange ? {
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x: x,
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y: y,
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weight: getWeight(distToOthersSquared, connectorPoint ? distToPointSquared : 0),
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connectorPoint: connectorPoint
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} : false;
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};
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/**
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* The main initiator method that runs on chart level after initiation and redraw. It runs in
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* a timeout to prevent locking, and loops over all series, taking all series and labels into
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* account when placing the labels.
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*/
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function drawLabels(proceed) {
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var chart = this;
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proceed.call(chart);
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clearTimeout(chart.seriesLabelTimer);
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chart.seriesLabelTimer = setTimeout(function() {
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chart.boxesToAvoid = [];
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// Build the interpolated points
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each(chart.series, function(series) {
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||
|
|
var options = series.options.label;
|
||
|
|
if (options.enabled && series.visible && (series.graph || series.area)) {
|
||
|
|
series.interpolatedPoints = series.getPointsOnGraph();
|
||
|
|
|
||
|
|
each(options.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;
|
||
|
|
|
||
|
|
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 (!series.labelBySeries) {
|
||
|
|
series.labelBySeries = 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 = series.labelBySeries.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(series.labelBySeries.x) || Math.round(best.y) !== Math.round(series.labelBySeries.y)) {
|
||
|
|
series.labelBySeries
|
||
|
|
.attr({
|
||
|
|
x: best.x - paneLeft,
|
||
|
|
y: best.y - paneTop,
|
||
|
|
anchorX: best.connectorPoint && best.connectorPoint.plotX,
|
||
|
|
anchorY: best.connectorPoint && best.connectorPoint.plotY,
|
||
|
|
opacity: 0
|
||
|
|
})
|
||
|
|
.animate({
|
||
|
|
opacity: 1
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
} else if (series.labelBySeries) {
|
||
|
|
series.labelBySeries = series.labelBySeries.destroy();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}, 350);
|
||
|
|
|
||
|
|
}
|
||
|
|
wrap(Chart.prototype, 'render', drawLabels);
|
||
|
|
wrap(Chart.prototype, 'redraw', drawLabels);
|
||
|
|
|
||
|
|
}(Highcharts));
|
||
|
|
}));
|