jwic.lib.jchart.src.Chart.StackedBar.js Maven / Gradle / Ivy
(function (factory) {
"use strict";
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['chart.js'], factory);
} else if (typeof exports === 'object') {
// Node/CommonJS
module.exports = factory(require('chart.js'));
} else {
// Global browser
factory(Chart);
}
}(function (Chart) {
"use strict";
var helpers = Chart.helpers;
var defaultConfig = {
scaleBeginAtZero : true,
//Boolean - Whether grid lines are shown across the chart
scaleShowGridLines : true,
//String - Colour of the grid lines
scaleGridLineColor : "rgba(0,0,0,.05)",
//Number - Width of the grid lines
scaleGridLineWidth : 1,
//Boolean - Whether to show horizontal lines (except X axis)
scaleShowHorizontalLines: true,
//Boolean - Whether to show vertical lines (except Y axis)
scaleShowVerticalLines: true,
//Boolean - If there is a stroke on each bar
barShowStroke : true,
//Number - Pixel width of the bar stroke
barStrokeWidth : 2,
//Number - Spacing between each of the X value sets
barValueSpacing : 5,
//Boolean - Whether bars should be rendered on a percentage base
relativeBars : false,
//String - A legend template
legendTemplate : "-legend\"><% for (var i=0; i- \"><%if(datasets[i].label){%><%=datasets[i].label%><%}%>
<%}%>
",
//Boolean - Show total legend
showTotal: false,
//String - Color of total legend
totalColor: '#fff',
//String - Total Label
totalLabel: 'Total',
//Boolean - Hide labels with value set to 0
tooltipHideZero: false
};
Chart.Type.extend({
name: "StackedBar",
defaults : defaultConfig,
initialize: function(data){
//Expose options as a scope variable here so we can access it in the ScaleClass
var options = this.options;
// Save data as a source for updating of values & methods
this.data = data;
this.ScaleClass = Chart.Scale.extend({
offsetGridLines : true,
calculateBarX : function(barIndex){
return this.calculateX(barIndex);
},
calculateY : function(value){
var scalingFactor = this.drawingArea() / (this.min - this.max);
return this.endPoint - (scalingFactor * (value - this.min));
},
calculateHeight : function(value){
var scalingFactor = this.drawingArea() / (this.min - this.max);
return Math.abs(scalingFactor * (value));
},
calculateBarY : function(datasets, dsIndex, barIndex, value){
var offset = 0,
sum = 0;
for(var i = 0; i < datasets.length; i++) {
sum += datasets[i].bars[barIndex].value;
}
for(i = dsIndex; i < datasets.length; i++) {
if(i === dsIndex && value) {
offset += value;
} else {
offset = +offset + (value >= 0 ? (datasets[i].bars[barIndex].value >= 0 ? +datasets[i].bars[barIndex].value: 0):(datasets[i].bars[barIndex].value <= 0 ? +datasets[i].bars[barIndex].value: 0));
}
}
if(options.relativeBars) {
offset = offset / sum * 100;
}
return this.calculateY(offset);
},
calculateBaseWidth : function(){
return (this.calculateX(1) - this.calculateX(0)) - (2*options.barValueSpacing);
},
calculateBaseHeight : function(){
return (this.calculateY(1) - this.calculateY(0));
},
calculateBarWidth : function(datasetCount){
//The padding between datasets is to the right of each bar, providing that there are more than 1 dataset
return this.calculateBaseWidth();
},
calculateBarHeight : function(datasets, dsIndex, barIndex, value) {
var sum = 0;
for(var i = 0; i < datasets.length; i++) {
sum += datasets[i].bars[barIndex].value;
}
if(!value) {
value = datasets[dsIndex].bars[barIndex].value;
}
if(options.relativeBars) {
value = value / sum * 100;
}
return this.calculateHeight(value);
},
calculateScaleRange : function(valuesArray, drawingSize, textSize, startFromZero, integersOnly){
//Set a minimum step of two - a point at the top of the graph, and a point at the base
var minSteps = 2,
maxSteps = Math.floor(drawingSize/(textSize * 1.5)),
skipFitting = (minSteps >= maxSteps);
var maxValue = helpers.max(valuesArray),
minValue = helpers.min(valuesArray);
// We need some degree of seperation here to calculate the scales if all the values are the same
// Adding/minusing 0.5 will give us a range of 1.
if (maxValue === minValue){
maxValue += 0.5;
// So we don't end up with a graph with a negative start value if we've said always start from zero
if (minValue >= 0.5 && !startFromZero){
minValue -= 0.5;
}
else{
// Make up a whole number above the values
maxValue += 0.5;
}
}
var valueRange = Math.abs(maxValue - minValue),
rangeOrderOfMagnitude = helpers.calculateOrderOfMagnitude(valueRange),
graphMax = Math.ceil(maxValue / (1 * Math.pow(10, rangeOrderOfMagnitude))) * Math.pow(10, rangeOrderOfMagnitude),
graphMin = (startFromZero && (minValue >= 0 )) ? 0 : Math.floor(minValue / (1 * Math.pow(10, rangeOrderOfMagnitude))) * Math.pow(10, rangeOrderOfMagnitude),
graphRange = graphMax - graphMin,
stepValue = Math.pow(10, rangeOrderOfMagnitude),
numberOfSteps = Math.round(graphRange / stepValue);
//If we have more space on the graph we'll use it to give more definition to the data
while((numberOfSteps > maxSteps || (numberOfSteps * 2) < maxSteps) && !skipFitting) {
if(numberOfSteps > maxSteps){
stepValue *=2;
numberOfSteps = Math.round(graphRange/stepValue);
// Don't ever deal with a decimal number of steps - cancel fitting and just use the minimum number of steps.
if (numberOfSteps % 1 !== 0){
skipFitting = true;
}
}
//We can fit in double the amount of scale points on the scale
else{
//If user has declared ints only, and the step value isn't a decimal
if (integersOnly && rangeOrderOfMagnitude >= 0){
//If the user has said integers only, we need to check that making the scale more granular wouldn't make it a float
if(stepValue/2 % 1 === 0){
stepValue /=2;
numberOfSteps = Math.round(graphRange/stepValue);
}
//If it would make it a float break out of the loop
else{
break;
}
}
//If the scale doesn't have to be an int, make the scale more granular anyway.
else{
stepValue /=2;
numberOfSteps = Math.round(graphRange/stepValue);
}
}
}
if (skipFitting){
numberOfSteps = minSteps;
stepValue = graphRange / numberOfSteps;
}
return {
steps : numberOfSteps,
stepValue : stepValue,
min : graphMin,
max : graphMin + (numberOfSteps * stepValue)
};
}
});
this.datasets = [];
//Set up tooltip events on the chart
if (this.options.showTooltips){
helpers.bindEvents(this, this.options.tooltipEvents, function(evt){
var activeBars = (evt.type !== 'mouseout') ? this.getBarsAtEvent(evt) : [];
this.eachBars(function(bar){
bar.restore(['fillColor', 'strokeColor']);
});
helpers.each(activeBars, function(activeBar){
activeBar.fillColor = activeBar.highlightFill;
activeBar.strokeColor = activeBar.highlightStroke;
});
this.showTooltip(activeBars);
});
}
//Declare the extension of the default point, to cater for the options passed in to the constructor
this.BarClass = Chart.Rectangle.extend({
strokeWidth : this.options.barStrokeWidth,
showStroke : this.options.barShowStroke,
ctx : this.chart.ctx
});
//Iterate through each of the datasets, and build this into a property of the chart
helpers.each(data.datasets,function(dataset,datasetIndex){
var datasetObject = {
label : dataset.label || null,
fillColor : dataset.fillColor,
strokeColor : dataset.strokeColor,
bars : []
};
this.datasets.push(datasetObject);
helpers.each(dataset.data,function(dataPoint,index){
if(!helpers.isNumber(dataPoint)){
dataPoint = 0;
}
//Add a new point for each piece of data, passing any required data to draw.
//Add 0 as value if !isNumber (e.g. empty values are useful when 0 values should be hidden in tooltip)
datasetObject.bars.push(new this.BarClass({
value : dataPoint,
label : data.labels[index],
datasetLabel: dataset.label,
strokeColor : dataset.strokeColor,
fillColor : dataset.fillColor,
highlightFill : dataset.highlightFill || dataset.fillColor,
highlightStroke : dataset.highlightStroke || dataset.strokeColor
}));
},this);
},this);
this.buildScale(data.labels);
this.eachBars(function(bar, index, datasetIndex){
helpers.extend(bar, {
base: this.scale.endPoint,
height: 0,
width : this.scale.calculateBarWidth(this.datasets.length),
x: this.scale.calculateBarX(index),
y: this.scale.endPoint
});
bar.save();
}, this);
this.render();
},
showTooltip : function(ChartElements, forceRedraw){
// Only redraw the chart if we've actually changed what we're hovering on.
if (typeof this.activeElements === 'undefined') this.activeElements = [];
helpers = Chart.helpers;
var isChanged = (function(Elements){
var changed = false;
if (Elements.length !== this.activeElements.length){
changed = true;
return changed;
}
helpers.each(Elements, function(element, index){
if (element !== this.activeElements[index]){
changed = true;
}
}, this);
return changed;
}).call(this, ChartElements);
if (!isChanged && !forceRedraw){
return;
}
else{
this.activeElements = ChartElements;
}
this.draw();
if(this.options.customTooltips){
this.options.customTooltips(false);
}
if (ChartElements.length > 0){
// If we have multiple datasets, show a MultiTooltip for all of the data points at that index
if (this.datasets && this.datasets.length > 1) {
var dataArray,
dataIndex;
for (var i = this.datasets.length - 1; i >= 0; i--) {
dataArray = this.datasets[i].points || this.datasets[i].bars || this.datasets[i].segments;
dataIndex = helpers.indexOf(dataArray, ChartElements[0]);
if (dataIndex !== -1){
break;
}
}
var tooltipLabels = [],
tooltipColors = [],
medianPosition = (function(index) {
// Get all the points at that particular index
var Elements = [],
dataCollection,
xPositions = [],
yPositions = [],
xMax,
yMax,
xMin,
yMin;
helpers.each(this.datasets, function(dataset){
dataCollection = dataset.points || dataset.bars || dataset.segments;
if (dataCollection[dataIndex] && dataCollection[dataIndex].hasValue()){
Elements.push(dataCollection[dataIndex]);
}
});
var total = {
datasetLabel: this.options.totalLabel,
value: 0,
fillColor: this.options.totalColor,
strokeColor: this.options.totalColor
};
helpers.each(Elements, function(element) {
if (this.options.tooltipHideZero && element.value === 0) {
return;
}
xPositions.push(element.x);
yPositions.push(element.y);
total.value += element.value;
//Include any colour information about the element
tooltipLabels.push(helpers.template(this.options.multiTooltipTemplate, element));
tooltipColors.push({
fill: element._saved.fillColor || element.fillColor,
stroke: element._saved.strokeColor || element.strokeColor
});
}, this);
if (this.options.showTotal) {
tooltipLabels.push(helpers.template(this.options.multiTooltipTemplate, total));
tooltipColors.push({
fill: total.fillColor,
stroke: total.strokeColor
});
}
yMin = helpers.min(yPositions);
yMax = helpers.max(yPositions);
xMin = helpers.min(xPositions);
xMax = helpers.max(xPositions);
return {
x: (xMin > this.chart.width/2) ? xMin : xMax,
y: (yMin + yMax)/2
};
}).call(this, dataIndex);
new Chart.MultiTooltip({
x: medianPosition.x,
y: medianPosition.y,
xPadding: this.options.tooltipXPadding,
yPadding: this.options.tooltipYPadding,
xOffset: this.options.tooltipXOffset,
fillColor: this.options.tooltipFillColor,
textColor: this.options.tooltipFontColor,
fontFamily: this.options.tooltipFontFamily,
fontStyle: this.options.tooltipFontStyle,
fontSize: this.options.tooltipFontSize,
titleTextColor: this.options.tooltipTitleFontColor,
titleFontFamily: this.options.tooltipTitleFontFamily,
titleFontStyle: this.options.tooltipTitleFontStyle,
titleFontSize: this.options.tooltipTitleFontSize,
cornerRadius: this.options.tooltipCornerRadius,
labels: tooltipLabels,
legendColors: tooltipColors,
legendColorBackground : this.options.multiTooltipKeyBackground,
title: ChartElements[0].label,
chart: this.chart,
ctx: this.chart.ctx,
custom: this.options.customTooltips
}).draw();
} else {
helpers.each(ChartElements, function(Element) {
var tooltipPosition = Element.tooltipPosition();
new Chart.Tooltip({
x: Math.round(tooltipPosition.x),
y: Math.round(tooltipPosition.y),
xPadding: this.options.tooltipXPadding,
yPadding: this.options.tooltipYPadding,
fillColor: this.options.tooltipFillColor,
textColor: this.options.tooltipFontColor,
fontFamily: this.options.tooltipFontFamily,
fontStyle: this.options.tooltipFontStyle,
fontSize: this.options.tooltipFontSize,
caretHeight: this.options.tooltipCaretSize,
cornerRadius: this.options.tooltipCornerRadius,
text: helpers.template(this.options.tooltipTemplate, Element),
chart: this.chart,
custom: this.options.customTooltips
}).draw();
}, this);
}
}
return this;
},
update : function(){
//Iterate through each of the datasets, and build this into a property of the chart
helpers.each(this.datasets,function(dataset,datasetIndex){
helpers.extend(this.datasets[datasetIndex], {
label : dataset.label || null,
fillColor : dataset.fillColor,
strokeColor : dataset.strokeColor,
});
helpers.each(dataset.data,function(dataPoint,index){
helpers.extend(this.datasets[datasetIndex].bars[index], {
value : dataPoint,
label : this.data.labels[index],
datasetLabel: dataset.label,
strokeColor : dataset.strokeColor,
fillColor : dataset.fillColor,
highlightFill : dataset.highlightFill || dataset.fillColor,
highlightStroke : dataset.highlightStroke || dataset.strokeColor
});
},this);
},this);
this.scale.update();
// Reset any highlight colours before updating.
helpers.each(this.activeElements, function(activeElement){
activeElement.restore(['fillColor', 'strokeColor']);
});
this.eachBars(function(bar){
bar.save();
});
this.render();
},
eachBars : function(callback){
helpers.each(this.datasets,function(dataset, datasetIndex){
helpers.each(dataset.bars, callback, this, datasetIndex);
},this);
},
getBarsAtEvent : function(e){
var barsArray = [],
eventPosition = helpers.getRelativePosition(e),
datasetIterator = function(dataset){
barsArray.push(dataset.bars[barIndex]);
},
barIndex;
for (var datasetIndex = 0; datasetIndex < this.datasets.length; datasetIndex++) {
for (barIndex = 0; barIndex < this.datasets[datasetIndex].bars.length; barIndex++) {
if (this.datasets[datasetIndex].bars[barIndex].inRange(eventPosition.x,eventPosition.y)){
helpers.each(this.datasets, datasetIterator);
return barsArray;
}
}
}
return barsArray;
},
buildScale : function(labels){
var self = this;
var dataTotal = function(){
var values = [];
//holds the sum of negative numbers
var sumNegNumbers = [];
//holds the positive numbers sum
var sumPozNumbers = [];
var min;
var max;
//compute the sum of the values for each value in all datasets
helpers.each(self.datasets, function(dataset) {
helpers.each(dataset.bars, function(bar, barIndex) {
if(!values[barIndex]){
values[barIndex] = 0;
}
if(!sumPozNumbers[barIndex]){
sumPozNumbers[barIndex] = 0;
}
if(!sumNegNumbers[barIndex]){
sumNegNumbers[barIndex] = 0;
}
if (0 == barIndex){
if (!max){
max = values[barIndex];
}
if (!min){
min = values[barIndex];
}
}
if(self.options.relativeBars) {
values[barIndex] = 100;
sumPozNumbers[barIndex] = 100;
sumNegNumbers[barIndex] = 100;
} else {
//in order to determine the right scale not affected by negative numbers we need to compute two sums
if (+bar.value >= 0){
sumPozNumbers[barIndex] = +sumPozNumbers[barIndex]+ +bar.value;
}else{
sumNegNumbers[barIndex] = +sumNegNumbers[barIndex]+ +bar.value;
}
//this is the sum of all numbers
values[barIndex] = +values[barIndex] + +bar.value;
//compute the min and the max values out of the data set
if (bar.value < min){
min = bar.value;
}
if (bar.value > max){
max = bar.value;
}
}
});
});
var maxSum = helpers.max(values);
var minSum = helpers.min(values);
if (helpers.max(sumPozNumbers) > maxSum){
maxSum = helpers.max(sumPozNumbers) ;
}
if (helpers.min(sumNegNumbers) < minSum){
minSum = helpers.min(sumNegNumbers) ;
}
//make sure we have the right min and max in the values for the scale to be adjusted right
if (min < minSum){
values.push(min);
}else{
values.push(minSum);
}
if (max > maxSum){
values.push(max);
}else{
values.push(maxSum);
}
//the values are used only to determine the scale size
return values;
};
var scaleOptions = {
templateString : this.options.scaleLabel,
height : this.chart.height,
width : this.chart.width,
ctx : this.chart.ctx,
textColor : this.options.scaleFontColor,
fontSize : this.options.scaleFontSize,
fontStyle : this.options.scaleFontStyle,
fontFamily : this.options.scaleFontFamily,
valuesCount : labels.length,
beginAtZero : this.options.scaleBeginAtZero,
integersOnly : this.options.scaleIntegersOnly,
calculateYRange: function(currentHeight){
var updatedRanges = this.calculateScaleRange(
dataTotal(),
currentHeight,
this.fontSize,
this.beginAtZero,
this.integersOnly
);
helpers.extend(this, updatedRanges);
},
xLabels : this.options.xLabels || labels,
font : helpers.fontString(this.options.scaleFontSize, this.options.scaleFontStyle, this.options.scaleFontFamily),
lineWidth : this.options.scaleLineWidth,
lineColor : this.options.scaleLineColor,
gridLineWidth : (this.options.scaleShowGridLines) ? this.options.scaleGridLineWidth : 0,
gridLineColor : (this.options.scaleShowGridLines) ? this.options.scaleGridLineColor : "rgba(0,0,0,0)",
showHorizontalLines : this.options.scaleShowHorizontalLines,
showVerticalLines : this.options.scaleShowVerticalLines,
padding : (this.options.showScale) ? 0 : (this.options.barShowStroke) ? this.options.barStrokeWidth : 0,
showLabels : this.options.scaleShowLabels,
display : this.options.showScale
};
if (this.options.scaleOverride){
helpers.extend(scaleOptions, {
calculateYRange: helpers.noop,
steps: this.options.scaleSteps,
stepValue: this.options.scaleStepWidth,
min: this.options.scaleStartValue,
max: this.options.scaleStartValue + (this.options.scaleSteps * this.options.scaleStepWidth)
});
}
this.scale = new this.ScaleClass(scaleOptions);
},
addData : function(valuesArray,label){
//Map the values array for each of the datasets
helpers.each(valuesArray,function(value,datasetIndex){
if (helpers.isNumber(value)){
//Add a new point for each piece of data, passing any required data to draw.
//Add 0 as value if !isNumber (e.g. empty values are useful when 0 values should be hidden in tooltip)
this.datasets[datasetIndex].bars.push(new this.BarClass({
value : helpers.isNumber(value)?value:0,
label : label,
x: this.scale.calculateBarX(this.scale.valuesCount+1),
y: this.scale.endPoint,
width : this.scale.calculateBarWidth(this.datasets.length),
base : this.scale.endPoint,
strokeColor : this.datasets[datasetIndex].strokeColor,
fillColor : this.datasets[datasetIndex].fillColor
}));
}
},this);
this.scale.addXLabel(label);
//Then re-render the chart.
this.update();
},
removeData : function(){
this.scale.removeXLabel();
//Then re-render the chart.
helpers.each(this.datasets,function(dataset){
dataset.bars.shift();
},this);
this.update();
},
reflow : function(){
helpers.extend(this.BarClass.prototype,{
y: this.scale.endPoint,
base : this.scale.endPoint
});
var newScaleProps = helpers.extend({
height : this.chart.height,
width : this.chart.width
});
this.scale.update(newScaleProps);
},
draw : function(ease){
var easingDecimal = ease || 1;
this.clear();
var ctx = this.chart.ctx;
this.scale.draw(easingDecimal);
//Draw all the bars for each dataset
helpers.each(this.datasets,function(dataset,datasetIndex){
helpers.each(dataset.bars,function(bar,index){
var y = this.scale.calculateBarY(this.datasets, datasetIndex, index, bar.value),
height = this.scale.calculateBarHeight(this.datasets, datasetIndex, index, bar.value);
//Transition then draw
if(bar.value > 0) {
bar.transition({
//base : this.scale.endPoint - (Math.abs(height) - Math.abs(y)),
base : (Math.abs(height) + Math.abs(y)),
x : this.scale.calculateBarX(index),
y : Math.abs(y),
height : Math.abs(height),
width : this.scale.calculateBarWidth(this.datasets.length)
}, easingDecimal).draw();
}else{
bar.transition({
base : Math.abs(y),
x : this.scale.calculateBarX(index),
y : Math.abs(y)-Math.abs(height),
height : Math.abs(height),
width : this.scale.calculateBarWidth(this.datasets.length)
}, easingDecimal).draw();
}
},this);
},this);
}
});
}));
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