2015-05-17 01:40:52 +02:00
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(function() {
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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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// The scale service is used to resize charts along with all of their axes. We make this as
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// a service where scales are registered with their respective charts so that changing the
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// scales does not require
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Chart.scaleService = {
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registeredCharts: [],
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getWrapperForChart: function(chartInstance) {
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var wrapper = helpers.findNextWhere(this.registeredCharts, function(charScaleWrapper) {
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return charScaleWrapper.chartInstance == chartInstance;
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});
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return wrapper;
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},
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registerChartScale: function(chartInstance, scaleInstance) {
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var chartScaleWrapper = this.getWrapperForChart(chartInstance);
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if (!chartScaleWrapper) {
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chartScaleWrapper = {
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scales: [],
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chartInstance: chartInstance,
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};
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this.registeredCharts.push(chartScaleWrapper);
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}
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chartScaleWrapper.scales.push(scaleInstance);
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},
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removeChartScale: function(chartInstance, scaleInstance) {
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var chartScaleWrapper = this.getWrapperForChart(chartInstance);
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if (chartScaleWrapper) {
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var scaleIndex = helpers.indexOf(scaleWrapper.scales, scaleInstance);
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if (scaleIndex) {
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scaleWrapper.scales.splice(scaleIndex, 1);
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}
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}
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},
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// Remove a chart instance from the scale service. Useful when a chart is destroyed
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removeChartInstance: function(chartInstance) {
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var index = helpers.findNextWhere(this.registeredCharts, function(scaleWrapper) {
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return scaleWrapper.chartInstance == chartInstance;
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});
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if (index) {
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this.registeredCharts.splice(index, 1);
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}
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},
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// The interesting function
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fitScalesForChart: function(chartInstance, width, height) {
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var chartScaleWrapper = this.getWrapperForChart(chartInstance);
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2015-05-17 19:20:37 +02:00
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var xPadding = 10;
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var yPadding = 10;
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2015-05-17 01:40:52 +02:00
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if (chartScaleWrapper) {
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var leftScales = helpers.where(chartScaleWrapper.scales, function(scaleInstance) {
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return scaleInstance.options.position == "left";
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});
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var rightScales = helpers.where(chartScaleWrapper.scales, function(scaleInstance) {
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return scaleInstance.options.position == "right";
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});
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var topScales = helpers.where(chartScaleWrapper.scales, function(scaleInstance) {
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return scaleInstance.options.position == "top";
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});
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var bottomScales = helpers.where(chartScaleWrapper.scales, function(scaleInstance) {
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return scaleInstance.options.position == "bottom";
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});
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2015-05-17 19:20:37 +02:00
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// Adjust the padding to take into account displaying labels
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2015-05-18 14:27:18 +02:00
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if (topScales.length === 0 || bottomScales.length === 0) {
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2015-05-17 19:20:37 +02:00
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var maxFontHeight = 0;
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var maxFontHeightFunction = function(scaleInstance) {
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if (scaleInstance.options.labels.show) {
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// Only consider font sizes for axes that actually show labels
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maxFontHeight = Math.max(maxFontHeight, scaleInstance.options.labels.fontSize);
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}
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};
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helpers.each(leftScales, maxFontHeightFunction);
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helpers.each(rightScales, maxFontHeightFunction);
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2015-05-18 14:27:18 +02:00
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if (topScales.length === 0) {
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2015-05-17 19:20:37 +02:00
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// Add padding so that we can handle drawing the top nicely
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yPadding += 0.75 * maxFontHeight; // 0.75 since padding added on both sides
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}
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2015-05-18 14:27:18 +02:00
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if (bottomScales.length === 0) {
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2015-05-17 19:20:37 +02:00
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// Add padding so that we can handle drawing the bottom nicely
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yPadding += 1.5 * maxFontHeight;
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}
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}
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2015-05-17 01:40:52 +02:00
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// Essentially we now have any number of scales on each of the 4 sides.
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// Our canvas looks like the following.
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// The areas L1 and L2 are the left axes. R1 is the right axis, T1 is the top axis and
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// B1 is the bottom axis
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// |------------------------------------------------------|
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// | | T1 | |
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// |----|-----|-------------------------------------|-----|
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// | | | | |
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// | L1 | L2 | Chart area | R1 |
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// | | | | |
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// | | | | |
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// |----|-----|-------------------------------------|-----|
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// | | B1 | |
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// | | | |
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// |------------------------------------------------------|
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// What we do to find the best sizing, we do the following
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// 1. Determine the minimum size of the chart area.
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// 2. Split the remaining width equally between each vertical axis
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// 3. Split the remaining height equally between each horizontal axis
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// 4. Give each scale the maximum size it can be. The scale will return it's minimum size
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// 5. Adjust the sizes of each axis based on it's minimum reported size.
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// 6. Refit each axis
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// 7. Position each axis in the final location
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// 8. Tell the chart the final location of the chart area
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// Step 1
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var chartWidth = width / 2; // min 50%
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var chartHeight = height / 2; // min 50%
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var aspectRatio = chartHeight / chartWidth;
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var screenAspectRatio;
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if (chartInstance.options.maintainAspectRatio) {
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screenAspectRatio = height / width;
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if (aspectRatio != screenAspectRatio) {
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chartHeight = chartWidth * screenAspectRatio;
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aspectRatio = screenAspectRatio;
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}
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}
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2015-05-17 19:20:37 +02:00
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chartWidth -= (2 * xPadding);
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chartHeight-= (2 * yPadding);
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2015-05-17 01:40:52 +02:00
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// Step 2
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var verticalScaleWidth = (width - chartWidth) / (leftScales.length + rightScales.length);
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// Step 3
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var horizontalScaleHeight = (height - chartHeight) / (topScales.length + bottomScales.length);
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// Step 4;
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var scalesToMinSize = {};
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var verticalScaleMinSizeFunction = function(scaleInstance) {
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var minSize = scaleInstance.fit(verticalScaleWidth, chartHeight);
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scalesToMinSize[scaleInstance] = minSize;
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};
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var horizontalScaleMinSizeFunction = function(scaleInstance) {
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var minSize = scaleInstance.fit(chartWidth, horizontalScaleHeight);
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scalesToMinSize[scaleInstance] = minSize;
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};
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// vertical scales
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helpers.each(leftScales, verticalScaleMinSizeFunction);
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helpers.each(rightScales, verticalScaleMinSizeFunction);
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// horizontal scales
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helpers.each(topScales, horizontalScaleMinSizeFunction);
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helpers.each(bottomScales, horizontalScaleMinSizeFunction);
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// Step 5
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2015-05-17 19:20:37 +02:00
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var maxChartHeight = height - (2 * yPadding);
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var maxChartWidth = width - (2 * xPadding);
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2015-05-17 01:40:52 +02:00
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var chartWidthReduceFunction = function(scaleInstance) {
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maxChartWidth -= scalesToMinSize[scaleInstance].width;
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};
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var chartHeightReduceFunction = function(scaleInstance) {
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maxChartHeight -= scalesToMinSize[scaleInstance].height;
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};
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helpers.each(leftScales, chartWidthReduceFunction);
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helpers.each(rightScales, chartWidthReduceFunction);
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helpers.each(topScales, chartHeightReduceFunction);
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helpers.each(bottomScales, chartHeightReduceFunction);
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// At this point, maxChartHeight and maxChartWidth are the size the chart area could
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// be if the axes are drawn at their minimum sizes.
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if (chartInstance.options.maintainAspectRatio) {
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// Figure out what the real max size will be
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var maxAspectRatio = maxChartHeight / maxChartWidth;
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if (maxAspectRatio != screenAspectRatio) {
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// Need to adjust
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if (maxChartHeight < maxChartWidth) {
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maxChartWidth = maxChartHeight / screenAspectRatio;
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}
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else {
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maxChartHeight = maxChartWidth * screenAspectRatio;
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}
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}
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}
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// Step 6
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var verticalScaleFitFunction = function(scaleInstance) {
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var minSize = scalesToMinSize[scaleInstance];
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scaleInstance.fit(minSize.width, maxChartHeight);
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};
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var horizontalScaleFitFunction = function(scaleInstance) {
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var minSize = scalesToMinSize[scaleInstance];
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scaleInstance.fit(maxChartWidth, minSize.width);
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};
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helpers.each(leftScales, verticalScaleFitFunction);
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helpers.each(rightScales, verticalScaleFitFunction);
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helpers.each(topScales, horizontalScaleFitFunction);
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helpers.each(bottomScales, horizontalScaleFitFunction);
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// Step 7
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2015-05-17 19:20:37 +02:00
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var totalLeftWidth = xPadding;
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var totalTopHeight = yPadding;
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2015-05-17 01:40:52 +02:00
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// Calculate total width of all left axes
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helpers.each(leftScales, function(scaleInstance) {
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totalLeftWidth += scaleInstance.width;
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});
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// Calculate total height of all top axes
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helpers.each(topScales, function(scaleInstance) {
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totalTopHeight += scaleInstance.height;
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});
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// Position the scales
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2015-05-17 19:20:37 +02:00
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var left = xPadding;
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var top = yPadding;
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2015-05-17 01:40:52 +02:00
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var right = 0;
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var bottom = 0;
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var verticalScalePlacer = function(scaleInstance) {
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scaleInstance.left = left;
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scaleInstance.right = left + scaleInstance.width;
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scaleInstance.top = totalTopHeight;
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scaleInstance.bottom = totalTopHeight + maxChartHeight;
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// Move to next point
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left = scaleInstance.right;
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};
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var horizontalScalePlacer = function(scaleInstance) {
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scaleInstance.left = totalLeftWidth;
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scaleInstance.right = totalLeftWidth + maxChartWidth;
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scaleInstance.top = top;
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scaleInstance.bottom = top + scaleInstance.height;
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// Move to next point
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top = scaleInstance.bottom;
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};
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helpers.each(leftScales, verticalScalePlacer);
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helpers.each(topScales, horizontalScalePlacer);
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// Account for chart width and height
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left += maxChartWidth;
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top += maxChartHeight;
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helpers.each(rightScales, verticalScalePlacer);
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helpers.each(bottomScales, horizontalScalePlacer);
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// Step 8
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chartScaleWrapper.chartInstance.chartArea = {
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left: totalLeftWidth,
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top: totalTopHeight,
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right: totalLeftWidth + maxChartWidth,
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bottom: totalTopHeight + maxChartHeight,
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};
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}
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}
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};
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// Scale registration object. Extensions can register new scale types (such as log or DB scales) and then
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// use the new chart options to grab the correct scale
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Chart.scales = {
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constructors: {},
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// Use a registration function so that we can move to an ES6 map when we no longer need to support
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// old browsers
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registerScaleType: function(scaleType, scaleConstructor) {
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this.constructors[scaleType] = scaleConstructor;
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},
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getScaleConstructor: function(scaleType) {
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return this.constructors.hasOwnProperty(scaleType) ? this.constructors[scaleType] : undefined;
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}
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};
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var LinearScale = Chart.Element.extend({
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calculateRange: helpers.noop, // overridden in the chart. Will set min and max as properties of the scale for later use
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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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generateTicks: function(width, height) {
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// We need to decide how many ticks we are going to have. Each tick draws a grid line.
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// There are two possibilities. The first is that the user has manually overridden the scale
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// calculations in which case the job is easy. The other case is that we have to do it ourselves
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//
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// We assume at this point that the scale object has been updated with the following values
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// by the chart.
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// min: this is the minimum value of the scale
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// max: this is the maximum value of the scale
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// options: contains the options for the scale. This is referenced from the user settings
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// rather than being cloned. This ensures that updates always propogate to a redraw
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// Reset the ticks array. Later on, we will draw a grid line at these positions
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// The array simply contains the numerical value of the spots where ticks will be
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this.ticks = [];
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if (this.options.override) {
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// The user has specified the manual override. We use <= instead of < so that
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// we get the final line
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for (var i = 0; i <= this.options.override.steps; ++i) {
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var value = this.options.override.start + (i * this.options.override.stepWidth);
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ticks.push(value);
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}
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}
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else {
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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(11, Math.ceil(width / 50));
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} else {
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2015-05-17 19:20:37 +02:00
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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(11, Math.ceil(height / (2 * this.options.labels.fontSize)));
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2015-05-17 01:40:52 +02:00
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}
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2015-05-17 19:29:17 +02:00
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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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2015-05-17 01:40:52 +02:00
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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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// 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.beginAtZero) {
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2015-05-18 14:51:13 +02:00
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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) {
|
|
|
|
// move the botttom down to 0
|
|
|
|
this.min = 0;
|
|
|
|
}
|
2015-05-17 01:40:52 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
var niceRange = helpers.niceNum(this.max - this.min, false);
|
|
|
|
var spacing = helpers.niceNum(niceRange / (maxTicks - 1), true);
|
|
|
|
var niceMin = Math.floor(this.min / spacing) * spacing;
|
|
|
|
var niceMax = Math.ceil(this.max / spacing) * spacing;
|
|
|
|
|
|
|
|
// Put the values into the ticks array
|
|
|
|
for (var j = niceMin; j <= niceMax; j += spacing) {
|
|
|
|
this.ticks.push(j);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (this.options.position == "left" || this.options.position == "right") {
|
|
|
|
// We are in a vertical orientation. The top value is the highest. So reverse the array
|
|
|
|
this.ticks.reverse();
|
|
|
|
}
|
2015-05-17 19:20:37 +02:00
|
|
|
|
|
|
|
// At this point, we need to update our max and min given the tick values since we have expanded the
|
|
|
|
// range of the scale
|
|
|
|
this.max = helpers.max(this.ticks);
|
|
|
|
this.min = helpers.min(this.ticks);
|
2015-05-17 01:40:52 +02:00
|
|
|
},
|
|
|
|
buildLabels: function() {
|
|
|
|
// We assume that this has been run after ticks have been generated. We try to figure out
|
|
|
|
// a label for each tick.
|
|
|
|
this.labels = [];
|
|
|
|
|
|
|
|
helpers.each(this.ticks, function(tick, index, ticks) {
|
|
|
|
var label;
|
|
|
|
|
|
|
|
if (this.options.labelCallback) {
|
|
|
|
// If the user provided a callback for label generation, use that as first priority
|
|
|
|
label = this.options.labelCallback(tick, index, ticks);
|
|
|
|
} else if (this.options.labels.template) {
|
|
|
|
// else fall back to the template string
|
|
|
|
label = helpers.template(this.options.labels.template, {
|
|
|
|
value: tick
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
this.labels.push(label ? label : ""); // empty string will not render so we're good
|
|
|
|
}, this);
|
|
|
|
},
|
|
|
|
getPixelForValue: function(value) {
|
|
|
|
// This must be called after fit has been run so that
|
|
|
|
// this.left, this.top, this.right, and this.bottom have been defined
|
|
|
|
var pixel;
|
|
|
|
var range = this.max - this.min;
|
|
|
|
|
|
|
|
if (this.isHorizontal()) {
|
|
|
|
pixel = this.left + (this.width / range * (value - this.min));
|
|
|
|
} else {
|
|
|
|
// Bottom - top since pixels increase downard on a screen
|
|
|
|
pixel = this.bottom - (this.height / range * (value - this.min));
|
|
|
|
}
|
|
|
|
|
|
|
|
return pixel;
|
|
|
|
},
|
|
|
|
// Fit this axis to the given size
|
|
|
|
// @param {number} maxWidth : the max width the axis can be
|
|
|
|
// @param {number} maxHeight: the max height the axis can be
|
|
|
|
// @return {object} minSize : the minimum size needed to draw the axis
|
|
|
|
fit: function(maxWidth, maxHeight) {
|
|
|
|
this.calculateRange();
|
|
|
|
this.generateTicks(maxWidth, maxHeight);
|
|
|
|
this.buildLabels();
|
|
|
|
|
|
|
|
var minSize = {
|
|
|
|
width: 0,
|
|
|
|
height: 0,
|
|
|
|
};
|
|
|
|
|
|
|
|
if (this.isHorizontal()) {
|
|
|
|
minSize.width = maxWidth; // fill all the width
|
|
|
|
|
|
|
|
// In a horizontal axis, we need some room for the scale to be drawn
|
|
|
|
//
|
|
|
|
// -----------------------------------------------------
|
|
|
|
// | | | | |
|
|
|
|
//
|
|
|
|
minSize.height = this.options.gridLines.show ? 25 : 0;
|
|
|
|
} else {
|
|
|
|
minSize.height = maxHeight; // fill all the height
|
|
|
|
|
|
|
|
// In a vertical axis, we need some room for the scale to be drawn.
|
|
|
|
// The actual grid lines will be drawn on the chart area, however, we need to show
|
|
|
|
// ticks where the axis actually is.
|
|
|
|
// We will allocate 25px for this width
|
|
|
|
// |
|
|
|
|
// -|
|
|
|
|
// |
|
|
|
|
// |
|
|
|
|
// -|
|
|
|
|
// |
|
|
|
|
// |
|
|
|
|
// -|
|
|
|
|
minSize.width = this.options.gridLines.show ? 25 : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (this.options.labels.show) {
|
|
|
|
// Don't bother fitting the labels if we are not showing them
|
|
|
|
var labelFont = helpers.fontString(this.options.labels.fontSize,
|
|
|
|
this.options.labels.fontStyle, this.options.labels.fontFamily);
|
|
|
|
|
|
|
|
if (this.isHorizontal()) {
|
|
|
|
// A horizontal axis is more constrained by the height.
|
|
|
|
var maxLabelHeight = maxHeight - minSize.height;
|
2015-05-18 14:43:38 +02:00
|
|
|
var labelHeight = 1.5 * this.options.labels.fontSize;
|
2015-05-17 01:40:52 +02:00
|
|
|
minSize.height = Math.min(maxHeight, minSize.height + labelHeight);
|
|
|
|
} else {
|
|
|
|
// A vertical axis is more constrained by the width. Labels are the dominant factor
|
|
|
|
// here, so get that length first
|
|
|
|
var maxLabelWidth = maxWidth - minSize.width;
|
|
|
|
var largestTextWidth = helpers.longestText(this.ctx, labelFont, this.labels);
|
|
|
|
|
|
|
|
if (largestTextWidth < maxLabelWidth) {
|
|
|
|
// We don't need all the room
|
|
|
|
minSize.width += largestTextWidth;
|
|
|
|
} else {
|
|
|
|
// Expand to max size
|
|
|
|
minSize.width = maxWidth;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
this.width = minSize.width;
|
|
|
|
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.show) {
|
|
|
|
|
|
|
|
var setContextLineSettings;
|
|
|
|
var hasZero;
|
|
|
|
|
2015-05-17 19:20:37 +02:00
|
|
|
// Make sure we draw text in the correct color
|
|
|
|
this.ctx.fillStyle = this.options.labels.fontColor;
|
|
|
|
|
2015-05-17 01:40:52 +02:00
|
|
|
if (this.isHorizontal()) {
|
|
|
|
if (this.options.gridLines.show) {
|
|
|
|
// Draw the horizontal line
|
|
|
|
setContextLineSettings = true;
|
|
|
|
hasZero = helpers.findNextWhere(this.ticks, function(tick) { return tick === 0; }) !== undefined;
|
|
|
|
var yTickStart = this.options.position == "bottom" ? this.top : this.bottom - 10;
|
|
|
|
var yTickEnd = this.options.position == "bottom" ? this.top + 10 : this.bottom;
|
|
|
|
|
|
|
|
this.ctx.lineWidth = this.options.gridLines.zeroLineWidth;
|
|
|
|
this.ctx.strokeStyle = this.options.gridLines.zeroLineColor;
|
|
|
|
|
|
|
|
this.ctx.beginPath();
|
|
|
|
|
|
|
|
if (this.options.position == "top") {
|
|
|
|
this.ctx.moveTo(this.left, this.bottom - 5);
|
|
|
|
this.ctx.lineTo(this.right, this.bottom - 5);
|
|
|
|
} else {
|
|
|
|
// On bottom, so draw horizontal line on the top
|
|
|
|
this.ctx.moveTo(this.left, this.top + 5);
|
|
|
|
this.ctx.lineTo(this.right, this.top + 5);
|
|
|
|
}
|
|
|
|
|
|
|
|
helpers.each(this.ticks, function(tick, index) {
|
|
|
|
// Grid lines are vertical
|
|
|
|
var xValue = this.getPixelForValue(tick);
|
|
|
|
|
|
|
|
if (tick === 0 || (!hasZero && index === 0)) {
|
|
|
|
// Draw the 0 point specially or the left if there is no 0
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
xValue += helpers.aliasPixel(this.ctx.lineWidth);
|
|
|
|
|
|
|
|
// Draw the label area
|
|
|
|
this.ctx.moveTo(xValue, yTickStart);
|
|
|
|
this.ctx.lineTo(xValue, yTickEnd);
|
|
|
|
|
|
|
|
// Draw the chart area
|
|
|
|
if (this.options.gridLines.drawOnChartArea) {
|
|
|
|
this.ctx.moveTo(xValue, chartArea.top);
|
|
|
|
this.ctx.lineTo(xValue, chartArea.bottom);
|
|
|
|
}
|
|
|
|
}, this);
|
|
|
|
|
|
|
|
this.ctx.stroke();
|
|
|
|
}
|
|
|
|
|
|
|
|
if (this.options.labels.show) {
|
|
|
|
// Draw the labels
|
|
|
|
|
|
|
|
var labelStartY;
|
|
|
|
|
|
|
|
if (this.options.position == "top") {
|
|
|
|
labelStartY = this.top;
|
|
|
|
} else {
|
|
|
|
// bottom side
|
|
|
|
labelStartY = this.top + 20;
|
|
|
|
}
|
|
|
|
|
|
|
|
this.ctx.textAlign = "center";
|
|
|
|
this.ctx.textBaseline = "top";
|
|
|
|
this.ctx.font = helpers.fontString(this.options.labels.fontSize, this.options.labels.fontStyle, this.options.labels.fontFamily);
|
|
|
|
|
|
|
|
helpers.each(this.labels, function(label, index) {
|
|
|
|
var xValue = this.getPixelForValue(this.ticks[index]);
|
|
|
|
this.ctx.fillText(label, xValue, labelStartY);
|
|
|
|
}, this);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
// Vertical
|
|
|
|
if (this.options.gridLines.show) {
|
|
|
|
|
|
|
|
// Draw the vertical line
|
|
|
|
setContextLineSettings = true;
|
|
|
|
hasZero = helpers.findNextWhere(this.ticks, function(tick) { return tick === 0; }) !== undefined;
|
|
|
|
var xTickStart = this.options.position == "left" ? this.left : this.right - 10;
|
|
|
|
var xTickEnd = this.options.position == "left" ? this.left + 10 : this.right;
|
|
|
|
|
|
|
|
this.ctx.lineWidth = this.options.gridLines.zeroLineWidth;
|
|
|
|
this.ctx.strokeStyle = this.options.gridLines.zeroLineColor;
|
|
|
|
|
|
|
|
this.ctx.beginPath();
|
|
|
|
|
|
|
|
if (this.options.position == "left") {
|
|
|
|
this.ctx.moveTo(this.right - 5, this.top);
|
|
|
|
this.ctx.lineTo(this.right - 5, this.bottom);
|
|
|
|
} else {
|
|
|
|
// On right, so draw vertical line on left size of axis block
|
|
|
|
this.ctx.moveTo(this.left + 5, this.top);
|
|
|
|
this.ctx.lineTo(this.left + 5, this.bottom);
|
|
|
|
}
|
|
|
|
|
|
|
|
helpers.each(this.ticks, function(tick, index) {
|
|
|
|
// Grid lines are horizontal
|
|
|
|
var yValue = this.getPixelForValue(tick);
|
|
|
|
|
|
|
|
if (tick === 0 || (!hasZero && index === 0)) {
|
|
|
|
// Draw the 0 point specially or the bottom if there is no 0
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Draw the label area
|
|
|
|
this.ctx.moveTo(xTickStart, yValue);
|
|
|
|
this.ctx.lineTo(xTickEnd, yValue);
|
|
|
|
|
|
|
|
// Draw the chart area
|
|
|
|
if (this.options.gridLines.drawOnChartArea) {
|
|
|
|
this.ctx.moveTo(chartArea.left, yValue);
|
|
|
|
this.ctx.lineTo(chartArea.right, yValue);
|
|
|
|
}
|
|
|
|
}, this);
|
|
|
|
|
|
|
|
this.ctx.stroke();
|
|
|
|
}
|
|
|
|
|
|
|
|
if (this.options.labels.show) {
|
|
|
|
// Draw the labels
|
|
|
|
|
|
|
|
var labelStartX;
|
|
|
|
var maxLabelWidth = this.width - 25;
|
|
|
|
|
|
|
|
if (this.options.position == "left") {
|
|
|
|
labelStartX = this.left;
|
|
|
|
} else {
|
|
|
|
// right side
|
|
|
|
labelStartX = this.left + 20;
|
|
|
|
}
|
|
|
|
|
|
|
|
this.ctx.textAlign = "left";
|
|
|
|
this.ctx.textBaseline = "middle";
|
|
|
|
this.ctx.font = helpers.fontString(this.options.labels.fontSize, this.options.labels.fontStyle, this.options.labels.fontFamily);
|
|
|
|
|
|
|
|
helpers.each(this.labels, function(label, index) {
|
|
|
|
var yValue = this.getPixelForValue(this.ticks[index]);
|
|
|
|
this.ctx.fillText(label, labelStartX, yValue, maxLabelWidth);
|
|
|
|
}, this);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
});
|
|
|
|
Chart.scales.registerScaleType("linear", LinearScale);
|
|
|
|
}).call(this);
|