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5d95280d7b
For consistency with `valueOrDefault`, `valueAtIndexOrDefault` now returns null if `value` (expected array) is null. Also get rid of the superfluous `get` prefix in `getValueOrDefault` and `getValueAtIndexOrDefault`.
191 lines
5.5 KiB
JavaScript
191 lines
5.5 KiB
JavaScript
'use strict';
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module.exports = function(Chart) {
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var helpers = Chart.helpers;
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var defaultConfig = {
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position: 'left',
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ticks: {
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callback: Chart.Ticks.formatters.linear
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}
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};
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var LinearScale = Chart.LinearScaleBase.extend({
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determineDataLimits: function() {
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var me = this;
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var opts = me.options;
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var chart = me.chart;
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var data = chart.data;
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var datasets = data.datasets;
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var isHorizontal = me.isHorizontal();
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var DEFAULT_MIN = 0;
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var DEFAULT_MAX = 1;
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function IDMatches(meta) {
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return isHorizontal ? meta.xAxisID === me.id : meta.yAxisID === me.id;
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}
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// First Calculate the range
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me.min = null;
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me.max = null;
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var hasStacks = opts.stacked;
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if (hasStacks === undefined) {
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helpers.each(datasets, function(dataset, datasetIndex) {
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if (hasStacks) {
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return;
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}
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var meta = chart.getDatasetMeta(datasetIndex);
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if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta) &&
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meta.stack !== undefined) {
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hasStacks = true;
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}
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});
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}
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if (opts.stacked || hasStacks) {
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var valuesPerStack = {};
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helpers.each(datasets, function(dataset, datasetIndex) {
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var meta = chart.getDatasetMeta(datasetIndex);
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var key = [
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meta.type,
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// we have a separate stack for stack=undefined datasets when the opts.stacked is undefined
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((opts.stacked === undefined && meta.stack === undefined) ? datasetIndex : ''),
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meta.stack
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].join('.');
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if (valuesPerStack[key] === undefined) {
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valuesPerStack[key] = {
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positiveValues: [],
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negativeValues: []
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};
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}
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// Store these per type
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var positiveValues = valuesPerStack[key].positiveValues;
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var negativeValues = valuesPerStack[key].negativeValues;
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if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
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helpers.each(dataset.data, function(rawValue, index) {
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var value = +me.getRightValue(rawValue);
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if (isNaN(value) || meta.data[index].hidden) {
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return;
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}
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positiveValues[index] = positiveValues[index] || 0;
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negativeValues[index] = negativeValues[index] || 0;
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if (opts.relativePoints) {
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positiveValues[index] = 100;
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} else if (value < 0) {
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negativeValues[index] += value;
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} else {
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positiveValues[index] += value;
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}
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});
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}
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});
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helpers.each(valuesPerStack, function(valuesForType) {
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var values = valuesForType.positiveValues.concat(valuesForType.negativeValues);
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var minVal = helpers.min(values);
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var maxVal = helpers.max(values);
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me.min = me.min === null ? minVal : Math.min(me.min, minVal);
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me.max = me.max === null ? maxVal : Math.max(me.max, maxVal);
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});
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} else {
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helpers.each(datasets, function(dataset, datasetIndex) {
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var meta = chart.getDatasetMeta(datasetIndex);
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if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
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helpers.each(dataset.data, function(rawValue, index) {
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var value = +me.getRightValue(rawValue);
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if (isNaN(value) || meta.data[index].hidden) {
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return;
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}
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if (me.min === null) {
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me.min = value;
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} else if (value < me.min) {
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me.min = value;
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}
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if (me.max === null) {
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me.max = value;
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} else if (value > me.max) {
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me.max = value;
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}
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});
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}
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});
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}
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me.min = isFinite(me.min) ? me.min : DEFAULT_MIN;
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me.max = isFinite(me.max) ? me.max : DEFAULT_MAX;
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// Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
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this.handleTickRangeOptions();
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},
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getTickLimit: function() {
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var maxTicks;
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var me = this;
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var tickOpts = me.options.ticks;
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if (me.isHorizontal()) {
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maxTicks = Math.min(tickOpts.maxTicksLimit ? tickOpts.maxTicksLimit : 11, Math.ceil(me.width / 50));
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} else {
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// The factor of 2 used to scale the font size has been experimentally determined.
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var tickFontSize = helpers.valueOrDefault(tickOpts.fontSize, Chart.defaults.global.defaultFontSize);
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maxTicks = Math.min(tickOpts.maxTicksLimit ? tickOpts.maxTicksLimit : 11, Math.ceil(me.height / (2 * tickFontSize)));
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}
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return maxTicks;
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},
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// Called after the ticks are built. We need
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handleDirectionalChanges: function() {
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if (!this.isHorizontal()) {
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// We are in a vertical orientation. The top value is the highest. So reverse the array
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this.ticks.reverse();
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}
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},
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getLabelForIndex: function(index, datasetIndex) {
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return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
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},
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// Utils
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getPixelForValue: function(value) {
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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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var me = this;
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var start = me.start;
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var rightValue = +me.getRightValue(value);
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var pixel;
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var range = me.end - start;
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if (me.isHorizontal()) {
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pixel = me.left + (me.width / range * (rightValue - start));
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return Math.round(pixel);
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}
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pixel = me.bottom - (me.height / range * (rightValue - start));
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return Math.round(pixel);
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},
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getValueForPixel: function(pixel) {
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var me = this;
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var isHorizontal = me.isHorizontal();
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var innerDimension = isHorizontal ? me.width : me.height;
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var offset = (isHorizontal ? pixel - me.left : me.bottom - pixel) / innerDimension;
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return me.start + ((me.end - me.start) * offset);
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},
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getPixelForTick: function(index) {
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return this.getPixelForValue(this.ticksAsNumbers[index]);
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}
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});
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Chart.scaleService.registerScaleType('linear', LinearScale, defaultConfig);
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};
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