mirror of
https://github.com/chartjs/Chart.js.git
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Merge pull request #1354 from nnnick/v2.0-dev-feature-auto-skip-labels
Auto-skip crowded axis-labels
This commit is contained in:
Evert Timberg
@@ -1,283 +1,293 @@
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(function() {
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"use strict";
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"use strict";
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var root = this,
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Chart = root.Chart,
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helpers = Chart.helpers;
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var root = this,
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Chart = root.Chart,
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helpers = Chart.helpers;
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// Default config for a category scale
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var defaultConfig = {
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display: true,
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position: "bottom",
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// Default config for a category scale
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var defaultConfig = {
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display: true,
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position: "bottom",
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// grid line settings
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gridLines: {
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show: true,
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color: "rgba(0, 0, 0, 0.1)",
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lineWidth: 1,
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drawOnChartArea: true,
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drawTicks: true,
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zeroLineWidth: 1,
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zeroLineColor: "rgba(0,0,0,0.25)",
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offsetGridLines: false,
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},
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// grid line settings
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gridLines: {
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show: true,
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color: "rgba(0, 0, 0, 0.1)",
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lineWidth: 1,
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drawOnChartArea: true,
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drawTicks: true,
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zeroLineWidth: 1,
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zeroLineColor: "rgba(0,0,0,0.25)",
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offsetGridLines: false,
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},
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// label settings
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labels: {
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show: true,
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template: "<%=value%>",
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fontSize: 12,
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fontStyle: "normal",
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fontColor: "#666",
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fontFamily: "Helvetica Neue",
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},
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};
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// label settings
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labels: {
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show: true,
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maxRotation: 90,
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template: "<%=value%>",
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fontSize: 12,
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fontStyle: "normal",
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fontColor: "#666",
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fontFamily: "Helvetica Neue",
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},
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};
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var DatasetScale = Chart.Element.extend({
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isHorizontal: function() {
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return this.options.position == "top" || this.options.position == "bottom";
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},
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buildLabels: function(index) {
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this.labels = [];
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var DatasetScale = Chart.Element.extend({
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isHorizontal: function() {
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return this.options.position == "top" || this.options.position == "bottom";
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},
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buildLabels: function(index) {
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this.labels = [];
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if (this.options.labels.userCallback) {
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this.data.labels.forEach(function(labelString, index) {
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this.labels.push(this.options.labels.userCallback(labelString, index));
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}, this);
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} else {
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this.labels = this.data.labels;
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}
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},
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getPixelForValue: function(value, index, datasetIndex, includeOffset) {
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// This must be called after fit has been run so that
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// this.left, this.top, this.right, and this.bottom have been defined
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if (this.isHorizontal()) {
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var isRotated = (this.labelRotation > 0);
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var innerWidth = this.width - (this.paddingLeft + this.paddingRight);
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var valueWidth = innerWidth / Math.max((this.labels.length - ((this.options.gridLines.offsetGridLines) ? 0 : 1)), 1);
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var valueOffset = (valueWidth * index) + this.paddingLeft;
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if (this.options.labels.userCallback) {
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this.data.labels.forEach(function(labelString, index) {
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this.labels.push(this.options.labels.userCallback(labelString, index));
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}, this);
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} else {
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this.labels = this.data.labels;
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}
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},
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getPixelForValue: function(value, index, datasetIndex, includeOffset) {
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// This must be called after fit has been run so that
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// this.left, this.top, this.right, and this.bottom have been defined
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if (this.isHorizontal()) {
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var isRotated = (this.labelRotation > 0);
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var innerWidth = this.width - (this.paddingLeft + this.paddingRight);
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var valueWidth = innerWidth / Math.max((this.labels.length - ((this.options.gridLines.offsetGridLines) ? 0 : 1)), 1);
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var valueOffset = (valueWidth * index) + this.paddingLeft;
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if (this.options.gridLines.offsetGridLines && includeOffset) {
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valueOffset += (valueWidth / 2);
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}
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if (this.options.gridLines.offsetGridLines && includeOffset) {
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valueOffset += (valueWidth / 2);
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}
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return this.left + Math.round(valueOffset);
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} else {
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return this.top + (index * (this.height / this.labels.length));
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}
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},
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getPointPixelForValue: function(value, index, datasetIndex) {
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return this.getPixelForValue(value, index, datasetIndex, true);
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},
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return this.left + Math.round(valueOffset);
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} else {
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return this.top + (index * (this.height / this.labels.length));
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}
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},
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getPointPixelForValue: function(value, index, datasetIndex) {
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return this.getPixelForValue(value, index, datasetIndex, true);
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},
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// Functions needed for bar charts
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calculateBaseWidth: function() {
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return (this.getPixelForValue(null, 1, 0, true) - this.getPixelForValue(null, 0, 0, true)) - (2 * this.options.categorySpacing);
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},
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calculateBarWidth: function(datasetCount) {
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//The padding between datasets is to the right of each bar, providing that there are more than 1 dataset
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var baseWidth = this.calculateBaseWidth() - ((datasetCount - 1) * this.options.spacing);
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// Functions needed for bar charts
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calculateBaseWidth: function() {
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return (this.getPixelForValue(null, 1, 0, true) - this.getPixelForValue(null, 0, 0, true)) - (2 * this.options.categorySpacing);
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},
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calculateBarWidth: function(datasetCount) {
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//The padding between datasets is to the right of each bar, providing that there are more than 1 dataset
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var baseWidth = this.calculateBaseWidth() - ((datasetCount - 1) * this.options.spacing);
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if (this.options.stacked) {
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return baseWidth;
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}
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return (baseWidth / datasetCount);
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},
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calculateBarX: function(datasetCount, datasetIndex, elementIndex) {
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var xWidth = this.calculateBaseWidth(),
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xAbsolute = this.getPixelForValue(null, elementIndex, datasetIndex, true) - (xWidth / 2),
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barWidth = this.calculateBarWidth(datasetCount);
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if (this.options.stacked) {
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return baseWidth;
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}
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return (baseWidth / datasetCount);
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},
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calculateBarX: function(datasetCount, datasetIndex, elementIndex) {
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var xWidth = this.calculateBaseWidth(),
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xAbsolute = this.getPixelForValue(null, elementIndex, datasetIndex, true) - (xWidth / 2),
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barWidth = this.calculateBarWidth(datasetCount);
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if (this.options.stacked) {
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return xAbsolute + barWidth / 2;
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}
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if (this.options.stacked) {
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return xAbsolute + barWidth / 2;
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}
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return xAbsolute + (barWidth * datasetIndex) + (datasetIndex * this.options.spacing) + barWidth / 2;
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},
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return xAbsolute + (barWidth * datasetIndex) + (datasetIndex * this.options.spacing) + barWidth / 2;
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},
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calculateLabelRotation: function(maxHeight, margins) {
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//Get the width of each grid by calculating the difference
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//between x offsets between 0 and 1.
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var labelFont = helpers.fontString(this.options.labels.fontSize, this.options.labels.fontStyle, this.options.labels.fontFamily);
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this.ctx.font = labelFont;
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calculateLabelRotation: function(maxHeight, margins) {
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//Get the width of each grid by calculating the difference
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//between x offsets between 0 and 1.
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var labelFont = helpers.fontString(this.options.labels.fontSize, this.options.labels.fontStyle, this.options.labels.fontFamily);
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this.ctx.font = labelFont;
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var firstWidth = this.ctx.measureText(this.labels[0]).width;
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var lastWidth = this.ctx.measureText(this.labels[this.labels.length - 1]).width;
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var firstRotated;
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var lastRotated;
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var firstWidth = this.ctx.measureText(this.labels[0]).width;
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var lastWidth = this.ctx.measureText(this.labels[this.labels.length - 1]).width;
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var firstRotated;
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var lastRotated;
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this.paddingRight = lastWidth / 2 + 3;
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this.paddingLeft = firstWidth / 2 + 3;
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this.paddingRight = lastWidth / 2 + 3;
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this.paddingLeft = firstWidth / 2 + 3;
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this.labelRotation = 0;
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this.labelRotation = 0;
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if (this.options.display) {
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var originalLabelWidth = helpers.longestText(this.ctx, labelFont, this.labels);
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var cosRotation;
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var sinRotation;
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var firstRotatedWidth;
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if (this.options.display) {
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var originalLabelWidth = helpers.longestText(this.ctx, labelFont, this.labels);
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var cosRotation;
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var sinRotation;
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var firstRotatedWidth;
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this.labelWidth = originalLabelWidth;
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this.labelWidth = originalLabelWidth;
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//Allow 3 pixels x2 padding either side for label readability
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// only the index matters for a dataset scale, but we want a consistent interface between scales
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var gridWidth = Math.floor(this.getPixelForValue(0, 1) - this.getPixelForValue(0, 0)) - 6;
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//Allow 3 pixels x2 padding either side for label readability
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// only the index matters for a dataset scale, but we want a consistent interface between scales
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//Max label rotate should be 90 - also act as a loop counter
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while (this.labelWidth > gridWidth && this.labelRotation <= 90) {
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cosRotation = Math.cos(helpers.toRadians(this.labelRotation));
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sinRotation = Math.sin(helpers.toRadians(this.labelRotation));
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var datasetWidth = Math.floor(this.getPixelForValue(0, 1) - this.getPixelForValue(0, 0)) - 6;
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firstRotated = cosRotation * firstWidth;
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lastRotated = cosRotation * lastWidth;
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//Max label rotation can be set or default to 90 - also act as a loop counter
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while (this.labelWidth > (datasetWidth + this.paddingLeft) && this.labelRotation <= this.options.labels.maxRotation) {
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cosRotation = Math.cos(helpers.toRadians(this.labelRotation));
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sinRotation = Math.sin(helpers.toRadians(this.labelRotation));
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// We're right aligning the text now.
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if (firstRotated + this.options.labels.fontSize / 2 > this.yLabelWidth) {
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this.paddingLeft = firstRotated + this.options.labels.fontSize / 2;
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}
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firstRotated = cosRotation * firstWidth;
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lastRotated = cosRotation * lastWidth;
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this.paddingRight = this.options.labels.fontSize / 2;
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// We're right aligning the text now.
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if (firstRotated + this.options.labels.fontSize / 2 > this.yLabelWidth) {
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this.paddingLeft = firstRotated + this.options.labels.fontSize / 2;
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}
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if (sinRotation * originalLabelWidth > maxHeight) {
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// go back one step
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this.labelRotation--;
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break;
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}
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this.paddingRight = this.options.labels.fontSize / 2;
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this.labelRotation++;
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this.labelWidth = cosRotation * originalLabelWidth;
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if (sinRotation * originalLabelWidth > maxHeight) {
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// go back one step
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this.labelRotation--;
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break;
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}
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}
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} else {
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this.labelWidth = 0;
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this.paddingRight = 0;
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this.paddingLeft = 0;
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}
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this.labelRotation++;
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this.labelWidth = cosRotation * originalLabelWidth;
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if (margins) {
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this.paddingLeft -= margins.left;
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this.paddingRight -= margins.right;
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}
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} else {
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this.labelWidth = 0;
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this.paddingRight = 0;
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this.paddingLeft = 0;
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}
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this.paddingLeft = Math.max(this.paddingLeft, 0);
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this.paddingRight = Math.max(this.paddingRight, 0);
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}
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if (margins) {
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this.paddingLeft -= margins.left;
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this.paddingRight -= margins.right;
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},
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// Fit this axis to the given size
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// @param {number} maxWidth : the max width the axis can be
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// @param {number} maxHeight: the max height the axis can be
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// @return {object} minSize : the minimum size needed to draw the axis
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fit: function(maxWidth, maxHeight, margins) {
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// Set the unconstrained dimension before label rotation
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if (this.isHorizontal()) {
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this.width = maxWidth;
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} else {
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this.height = maxHeight;
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}
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this.paddingLeft = Math.max(this.paddingLeft, 0);
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this.paddingRight = Math.max(this.paddingRight, 0);
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}
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this.buildLabels();
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this.calculateLabelRotation(maxHeight, margins);
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},
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// Fit this axis to the given size
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// @param {number} maxWidth : the max width the axis can be
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// @param {number} maxHeight: the max height the axis can be
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// @return {object} minSize : the minimum size needed to draw the axis
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fit: function(maxWidth, maxHeight, margins) {
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// Set the unconstrained dimension before label rotation
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if (this.isHorizontal()) {
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this.width = maxWidth;
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} else {
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this.height = maxHeight;
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}
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var minSize = {
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width: 0,
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height: 0,
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};
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this.buildLabels();
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this.calculateLabelRotation(maxHeight, margins);
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var labelFont = helpers.fontString(this.options.labels.fontSize, this.options.labels.fontStyle, this.options.labels.fontFamily);
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var longestLabelWidth = helpers.longestText(this.ctx, labelFont, this.labels);
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var minSize = {
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width: 0,
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height: 0,
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};
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// Width
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if (this.isHorizontal()) {
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minSize.width = maxWidth;
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} else if (this.options.display) {
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minSize.width = Math.min(longestLabelWidth + 6, maxWidth);
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}
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var labelFont = helpers.fontString(this.options.labels.fontSize, this.options.labels.fontStyle, this.options.labels.fontFamily);
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var longestLabelWidth = helpers.longestText(this.ctx, labelFont, this.labels);
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||||
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// Height
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||||
if (this.isHorizontal() && this.options.display) {
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var labelHeight = (Math.sin(helpers.toRadians(this.labelRotation)) * longestLabelWidth) + 1.5 * this.options.labels.fontSize;
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||||
minSize.height = Math.min(labelHeight, maxHeight);
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} else if (this.options.display) {
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||||
minSize.height = maxHeight;
|
||||
}
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||||
// Width
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||||
if (this.isHorizontal()) {
|
||||
minSize.width = maxWidth;
|
||||
} else if (this.options.display) {
|
||||
minSize.width = Math.min(longestLabelWidth + 6, maxWidth);
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}
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this.width = minSize.width;
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this.height = minSize.height;
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return minSize;
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},
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// Actualy draw the scale on the canvas
|
||||
// @param {rectangle} chartArea : the area of the chart to draw full grid lines on
|
||||
draw: function(chartArea) {
|
||||
if (this.options.display) {
|
||||
// Height
|
||||
if (this.isHorizontal() && this.options.display) {
|
||||
var labelHeight = (Math.sin(helpers.toRadians(this.labelRotation)) * longestLabelWidth) + 1.5 * this.options.labels.fontSize;
|
||||
minSize.height = Math.min(labelHeight, maxHeight);
|
||||
} else if (this.options.display) {
|
||||
minSize.height = maxHeight;
|
||||
}
|
||||
|
||||
var setContextLineSettings;
|
||||
this.width = minSize.width;
|
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this.height = minSize.height;
|
||||
return minSize;
|
||||
},
|
||||
// Actualy draw the scale on the canvas
|
||||
// @param {rectangle} chartArea : the area of the chart to draw full grid lines on
|
||||
draw: function(chartArea) {
|
||||
if (this.options.display) {
|
||||
|
||||
// Make sure we draw text in the correct color
|
||||
this.ctx.fillStyle = this.options.labels.fontColor;
|
||||
var setContextLineSettings;
|
||||
|
||||
if (this.isHorizontal()) {
|
||||
setContextLineSettings = true;
|
||||
var yTickStart = this.options.position == "bottom" ? this.top : this.bottom - 10;
|
||||
var yTickEnd = this.options.position == "bottom" ? this.top + 10 : this.bottom;
|
||||
var isRotated = this.labelRotation !== 0;
|
||||
// Make sure we draw text in the correct color
|
||||
this.ctx.fillStyle = this.options.labels.fontColor;
|
||||
|
||||
helpers.each(this.labels, function(label, index) {
|
||||
var xLineValue = this.getPixelForValue(label, index, null, false); // xvalues for grid lines
|
||||
var xLabelValue = this.getPixelForValue(label, index, null, true); // x values for labels (need to consider offsetLabel option)
|
||||
if (this.isHorizontal()) {
|
||||
setContextLineSettings = true;
|
||||
var yTickStart = this.options.position == "bottom" ? this.top : this.bottom - 10;
|
||||
var yTickEnd = this.options.position == "bottom" ? this.top + 10 : this.bottom;
|
||||
var isRotated = this.labelRotation !== 0;
|
||||
var skipRatio = false;
|
||||
|
||||
if (this.options.gridLines.show) {
|
||||
if (index === 0) {
|
||||
// Draw the first index specially
|
||||
this.ctx.lineWidth = this.options.gridLines.zeroLineWidth;
|
||||
this.ctx.strokeStyle = this.options.gridLines.zeroLineColor;
|
||||
setContextLineSettings = true; // reset next time
|
||||
} else if (setContextLineSettings) {
|
||||
this.ctx.lineWidth = this.options.gridLines.lineWidth;
|
||||
this.ctx.strokeStyle = this.options.gridLines.color;
|
||||
setContextLineSettings = false;
|
||||
}
|
||||
if ((this.options.labels.fontSize + 4) * this.labels.length > (this.width - (this.paddingLeft + this.paddingRight))) {
|
||||
skipRatio = 1 + Math.floor(((this.options.labels.fontSize + 4) * this.labels.length) / (this.width - (this.paddingLeft + this.paddingRight)));
|
||||
}
|
||||
|
||||
xLineValue += helpers.aliasPixel(this.ctx.lineWidth);
|
||||
helpers.each(this.labels, function(label, index) {
|
||||
if (skipRatio > 1 && index % skipRatio > 0) {
|
||||
return;
|
||||
}
|
||||
var xLineValue = this.getPixelForValue(label, index, null, false); // xvalues for grid lines
|
||||
var xLabelValue = this.getPixelForValue(label, index, null, true); // x values for labels (need to consider offsetLabel option)
|
||||
|
||||
// Draw the label area
|
||||
this.ctx.beginPath();
|
||||
if (this.options.gridLines.show) {
|
||||
if (index === 0) {
|
||||
// Draw the first index specially
|
||||
this.ctx.lineWidth = this.options.gridLines.zeroLineWidth;
|
||||
this.ctx.strokeStyle = this.options.gridLines.zeroLineColor;
|
||||
setContextLineSettings = true; // reset next time
|
||||
} else if (setContextLineSettings) {
|
||||
this.ctx.lineWidth = this.options.gridLines.lineWidth;
|
||||
this.ctx.strokeStyle = this.options.gridLines.color;
|
||||
setContextLineSettings = false;
|
||||
}
|
||||
|
||||
if (this.options.gridLines.drawTicks) {
|
||||
this.ctx.moveTo(xLineValue, yTickStart);
|
||||
this.ctx.lineTo(xLineValue, yTickEnd);
|
||||
}
|
||||
xLineValue += helpers.aliasPixel(this.ctx.lineWidth);
|
||||
|
||||
// Draw the chart area
|
||||
if (this.options.gridLines.drawOnChartArea) {
|
||||
this.ctx.moveTo(xLineValue, chartArea.top);
|
||||
this.ctx.lineTo(xLineValue, chartArea.bottom);
|
||||
}
|
||||
// Draw the label area
|
||||
this.ctx.beginPath();
|
||||
|
||||
// Need to stroke in the loop because we are potentially changing line widths & colours
|
||||
this.ctx.stroke();
|
||||
}
|
||||
if (this.options.gridLines.drawTicks) {
|
||||
this.ctx.moveTo(xLineValue, yTickStart);
|
||||
this.ctx.lineTo(xLineValue, yTickEnd);
|
||||
}
|
||||
|
||||
if (this.options.labels.show) {
|
||||
this.ctx.save();
|
||||
this.ctx.translate(xLabelValue, (isRotated) ? this.top + 12 : this.top + 8);
|
||||
this.ctx.rotate(helpers.toRadians(this.labelRotation) * -1);
|
||||
this.ctx.font = this.font;
|
||||
this.ctx.textAlign = (isRotated) ? "right" : "center";
|
||||
this.ctx.textBaseline = (isRotated) ? "middle" : "top";
|
||||
this.ctx.fillText(label, 0, 0);
|
||||
this.ctx.restore();
|
||||
}
|
||||
}, this);
|
||||
} else {
|
||||
// Vertical
|
||||
if (this.options.gridLines.show) {}
|
||||
// Draw the chart area
|
||||
if (this.options.gridLines.drawOnChartArea) {
|
||||
this.ctx.moveTo(xLineValue, chartArea.top);
|
||||
this.ctx.lineTo(xLineValue, chartArea.bottom);
|
||||
}
|
||||
|
||||
if (this.options.labels.show) {
|
||||
// Draw the labels
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
});
|
||||
Chart.scaleService.registerScaleType("category", DatasetScale, defaultConfig);
|
||||
// Need to stroke in the loop because we are potentially changing line widths & colours
|
||||
this.ctx.stroke();
|
||||
}
|
||||
|
||||
if (this.options.labels.show) {
|
||||
this.ctx.save();
|
||||
this.ctx.translate(xLabelValue, (isRotated) ? this.top + 12 : this.top + 8);
|
||||
this.ctx.rotate(helpers.toRadians(this.labelRotation) * -1);
|
||||
this.ctx.font = this.font;
|
||||
this.ctx.textAlign = (isRotated) ? "right" : "center";
|
||||
this.ctx.textBaseline = (isRotated) ? "middle" : "top";
|
||||
this.ctx.fillText(label, 0, 0);
|
||||
this.ctx.restore();
|
||||
}
|
||||
}, this);
|
||||
} else {
|
||||
// Vertical
|
||||
if (this.options.gridLines.show) {}
|
||||
|
||||
if (this.options.labels.show) {
|
||||
// Draw the labels
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
});
|
||||
Chart.scaleService.registerScaleType("category", DatasetScale, defaultConfig);
|
||||
}).call(this);
|
||||
|
||||
Reference in New Issue
Block a user