2016-02-12 04:30:53 +01:00
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"use strict";
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module.exports = function(Chart) {
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2016-02-14 02:12:26 +01:00
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var helpers = Chart.helpers;
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2016-02-12 04:30:53 +01:00
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var defaultConfig = {
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position: "left",
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ticks: {
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callback: function(tickValue, index, ticks) {
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var delta = ticks[1] - ticks[0];
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// If we have a number like 2.5 as the delta, figure out how many decimal places we need
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if (Math.abs(delta) > 1) {
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if (tickValue !== Math.floor(tickValue)) {
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// not an integer
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delta = tickValue - Math.floor(tickValue);
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}
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}
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var logDelta = helpers.log10(Math.abs(delta));
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var tickString = '';
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if (tickValue !== 0) {
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var numDecimal = -1 * Math.floor(logDelta);
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numDecimal = Math.max(Math.min(numDecimal, 20), 0); // toFixed has a max of 20 decimal places
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tickString = tickValue.toFixed(numDecimal);
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} else {
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tickString = '0'; // never show decimal places for 0
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}
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return tickString;
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}
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}
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};
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var LinearScale = Chart.Scale.extend({
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determineDataLimits: function() {
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// First Calculate the range
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this.min = null;
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this.max = null;
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if (this.options.stacked) {
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var valuesPerType = {};
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var hasPositiveValues = false;
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var hasNegativeValues = false;
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helpers.each(this.chart.data.datasets, function(dataset) {
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if (valuesPerType[dataset.type] === undefined) {
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valuesPerType[dataset.type] = {
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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 = valuesPerType[dataset.type].positiveValues;
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var negativeValues = valuesPerType[dataset.type].negativeValues;
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if (helpers.isDatasetVisible(dataset) && (this.isHorizontal() ? dataset.xAxisID === this.id : dataset.yAxisID === this.id)) {
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helpers.each(dataset.data, function(rawValue, index) {
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var value = +this.getRightValue(rawValue);
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if (isNaN(value)) {
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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 (this.options.relativePoints) {
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positiveValues[index] = 100;
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} else {
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if (value < 0) {
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hasNegativeValues = true;
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negativeValues[index] += value;
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} else {
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hasPositiveValues = true;
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positiveValues[index] += value;
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}
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}
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}, this);
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}
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}, this);
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helpers.each(valuesPerType, 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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2016-02-14 02:12:26 +01:00
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var maxVal = helpers.max(values);
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2016-02-12 04:30:53 +01:00
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this.min = this.min === null ? minVal : Math.min(this.min, minVal);
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this.max = this.max === null ? maxVal : Math.max(this.max, maxVal);
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}, this);
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} else {
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helpers.each(this.chart.data.datasets, function(dataset) {
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if (helpers.isDatasetVisible(dataset) && (this.isHorizontal() ? dataset.xAxisID === this.id : dataset.yAxisID === this.id)) {
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helpers.each(dataset.data, function(rawValue, index) {
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var value = +this.getRightValue(rawValue);
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if (isNaN(value)) {
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return;
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}
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if (this.min === null) {
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this.min = value;
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} else if (value < this.min) {
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this.min = value;
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}
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if (this.max === null) {
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this.max = value;
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} else if (value > this.max) {
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this.max = value;
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}
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}, this);
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}
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}, this);
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}
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// If we are forcing it to begin at 0, but 0 will already be rendered on the chart,
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// do nothing since that would make the chart weird. If the user really wants a weird chart
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// axis, they can manually override it
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if (this.options.ticks.beginAtZero) {
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var minSign = helpers.sign(this.min);
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var maxSign = helpers.sign(this.max);
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if (minSign < 0 && maxSign < 0) {
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// move the top up to 0
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this.max = 0;
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} else if (minSign > 0 && maxSign > 0) {
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// move the botttom down to 0
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this.min = 0;
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}
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}
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if (this.options.ticks.min !== undefined) {
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this.min = this.options.ticks.min;
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} else if (this.options.ticks.suggestedMin !== undefined) {
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this.min = Math.min(this.min, this.options.ticks.suggestedMin);
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}
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if (this.options.ticks.max !== undefined) {
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this.max = this.options.ticks.max;
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} else if (this.options.ticks.suggestedMax !== undefined) {
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this.max = Math.max(this.max, this.options.ticks.suggestedMax);
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}
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if (this.min === this.max) {
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this.min--;
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this.max++;
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}
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},
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buildTicks: function() {
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// Then calulate the ticks
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this.ticks = [];
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// Figure out what the max number of ticks we can support it is based on the size of
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// the axis area. For now, we say that the minimum tick spacing in pixels must be 50
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// We also limit the maximum number of ticks to 11 which gives a nice 10 squares on
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// the graph
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var maxTicks;
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if (this.isHorizontal()) {
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maxTicks = Math.min(this.options.ticks.maxTicksLimit ? this.options.ticks.maxTicksLimit : 11,
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Math.ceil(this.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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maxTicks = Math.min(this.options.ticks.maxTicksLimit ? this.options.ticks.maxTicksLimit : 11,
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Math.ceil(this.height / (2 * this.options.ticks.fontSize)));
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}
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// Make sure we always have at least 2 ticks
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maxTicks = Math.max(2, maxTicks);
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// To get a "nice" value for the tick spacing, we will use the appropriately named
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// "nice number" algorithm. See http://stackoverflow.com/questions/8506881/nice-label-algorithm-for-charts-with-minimum-ticks
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// for details.
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var spacing;
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var fixedStepSizeSet = this.options.ticks.fixedStepSize && this.options.ticks.fixedStepSize > 0;
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if (fixedStepSizeSet) {
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spacing = this.options.ticks.fixedStepSize;
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} else {
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var niceRange = helpers.niceNum(this.max - this.min, false);
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spacing = helpers.niceNum(niceRange / (maxTicks - 1), true);
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}
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var niceMin = Math.floor(this.min / spacing) * spacing;
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var niceMax = Math.ceil(this.max / spacing) * spacing;
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var numSpaces = (niceMax - niceMin) / spacing;
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// If very close to our rounded value, use it.
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if (helpers.almostEquals(numSpaces, Math.round(numSpaces), spacing / 1000)) {
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numSpaces = Math.round(numSpaces);
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} else {
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numSpaces = Math.ceil(numSpaces);
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}
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// Put the values into the ticks array
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this.ticks.push(this.options.ticks.min !== undefined ? this.options.ticks.min : niceMin);
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for (var j = 1; j < numSpaces; ++j) {
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this.ticks.push(niceMin + (j * spacing));
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}
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this.ticks.push(this.options.ticks.max !== undefined ? this.options.ticks.max : niceMax);
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if (this.options.position == "left" || this.options.position == "right") {
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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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// At this point, we need to update our max and min given the tick values since we have expanded the
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// range of the scale
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this.max = helpers.max(this.ticks);
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this.min = helpers.min(this.ticks);
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if (this.options.ticks.reverse) {
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this.ticks.reverse();
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this.start = this.max;
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this.end = this.min;
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} else {
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this.start = this.min;
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this.end = this.max;
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}
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this.ticksAsNumbers = this.ticks.slice(); // do after we potentially reverse the ticks
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this.zeroLineIndex = this.ticks.indexOf(0);
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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, 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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var rightValue = +this.getRightValue(value);
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var pixel;
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var range = this.end - this.start;
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if (this.isHorizontal()) {
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var innerWidth = this.width - (this.paddingLeft + this.paddingRight);
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pixel = this.left + (innerWidth / range * (rightValue - this.start));
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return Math.round(pixel + this.paddingLeft);
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} else {
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var innerHeight = this.height - (this.paddingTop + this.paddingBottom);
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pixel = (this.bottom - this.paddingBottom) - (innerHeight / range * (rightValue - this.start));
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return Math.round(pixel);
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}
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},
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getPixelForTick: function(index, includeOffset) {
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return this.getPixelForValue(this.ticksAsNumbers[index], null, null, includeOffset);
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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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