/** * @license Highcharts JS v5.0.0 (2016-09-29) * * (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. */ function drawLabels(proceed) { var chart = this; proceed.call(chart); clearTimeout(chart.seriesLabelTimer); chart.seriesLabelTimer = setTimeout(function() { chart.boxesToAvoid = []; // Build the interpolated points each(chart.series, function(series) { 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)); }));