Develop Reference

Highcharts improperly handling negative values

I have created a JS fiddle where the percentage area graph chart is plotted using data with a set of negative values.
Highcharts.chart('container', {
"chart": {
"type": "area",
"style": {
"fontFamily": "Arial"
},
"width": "800"
},
"title": {
"text": ""
},
"credits": {
"enabled": false,
"additionalProperties": {}
},
"legend": {
"border": "#333333",
"borderWidth": 0,
"borderRadius": 3,
"itemDistance": 20,
"itemMarginBottom": 3,
"margin": 5,
"padding": 10,
"align": "center",
"itemStyle": {
"fontSize": "10",
"font-weight": "normal",
"fontFamily": "Arial"
},
"itemWidth": 200
},
"subtitle": {
"text": ""
},
"colors": ["#67A262", "#67A262", "#FFC110", "#f77b3f", "#61d3f0"],
"xAxis": {
"categories": ["12/11", "4/12", "8/12", "12/12", "4/13", "8/13", "12/13", "4/14", "8/14", "12/14", "4/15", "8/15", "12/15", "4/16", "8/16", "12/16", "4/17", "8/17", "12/17", "4/18", "8/18", "12/18", "4/19", "8/19", "10/19"],
"tickmarkPlacement": "on",
"title": {
"enabled": false
},
"labels": {
"align": "center",
"style": {
"fontSize": "10px",
"font-weight": "normal",
"fontFamily": "Arial, Helvetica, sans-serif"
}
}
},
"yAxis": {
"title": {
"text": "Percent"
}
},
"tooltip": {
"pointFormat": "<span style=\"color:{[#67A262, #67A262, #FFC110, #f77b3f, #61d3f0]}\">{series.name}</span>: <b>{point.percentage:.1f}%</b> ({point.y:,.0f} millions)<br/>",
"shared": true
},
"plotOptions": {
"area": {
"stacking": "percent",
"lineColor": "#ffffff",
"lineWidth": 1,
"marker": {
"lineWidth": 0,
"lineColor": "#ffffff",
"enabled": false
}
}
},
"series": [{
"name": "Cash",
"data": [0, 0, 3247037, 4115431, 3649666, 5297250, 4956569, 1625115, 3174121, 6694144, 1512948, 3440926, 683988, 889192, 703447, 2515743, 5878442, 5260639, 2247735, 1696123, 6485498, 1514393, 2055804, 1546508, 1421063]
}, {
"name": "Fixed Income",
"data": [0, 0, 1216772, 1659681, 1902223, 1570967, 1314055, 977437, 887057, 1536891, -653674, -1059915, -1339804, -1071393, -998063, -1200418, -1375094, -1438987, 377989, -133323, 7332923, 12508089, 13924871, 15185459, 15145308]
}, {
"name": "Equities",
"data": [0, 0, 2924177, 7939481, 10863595, 12100681, 16650757, 18639670, 20783963, 17146281, 9656794, 6784358, 7574038, 5126567, 5647696, 2539386, 2750490, 3856696, 4627848, 6936117, 22863720, 19581687, 23265765, 21775318, 22517049]
}, {
"name": "Alternatives",
"data": [11729500, 11896355, 12286734, 12043719, 12763997, 11602665, 9505520, 9005992, 9954085, 11116397, 1982778, 3138404, 3767757, 3899267, 3614944, 5307771, 1708839, 889320, 3074970, 840986, 15276520, 15166745, 15090469, 14700818, 14904036]
}, {
"name": "Other",
"data": [482853, 550589, 627809, 813745, 946673, 1017471, 1101900, 1076074, 1254348, 1230801, 1499999, 1500000, 1631191, 2188279, 2188478, 2254838, 2423621, 2422634, 2432769, 2367905, 4647985, 4530435, 22885564, 23693095, 23706588]
}]
});
Here the Highcharts treats the negative values as positive while computing the percentage.
Expected calculations:
Implemented calculations:
Please help me understand the implementations.

Chart.js performance issue on iPad

I have created a small game using chart.js and canvas. However I have only one canvas to create the whole game so I wanted to draw some images too on the canvas.
Due to this the games works superb on windows as well as android phone but I'm facing performance issue on the iPad. Can anyone assist me in achieving my task keeping only one canvas
I have recreated the scenario in the below pen
https://codepen.io/sushantipte48/pen/voLxyW
var _ctx = document.getElementById('myChart').getContext("2d")
var canvas = document.createElement('canvas');
canvas.width = 300;
canvas.height =200;
var bg = new Image();
bg.src = 'https://img.freepik.com/free-vector/vibrant-pink-watercolor-painting-background_53876-58930.jpg?size=626&ext=jpg';
var ctx = canvas.getContext('2d')
var graphImage;
var mainData = [],
points = [],
x = 0,
y = 0,
config,
currentMax = 20,
slope = 1;
config = {
"data": {
"datasets": [{
"type": "line",
"data": mainData,
"backgroundColor": "#ff0000",
"borderColor": "#ff0000",
"fill": false,
"lineTension": 1,
"borderWidth": 1,
"pointRadius": 0
}]
},
"options": {
"legend": {
"display": false
},
"animation": {
"duration": 0
},
"responsive": false,
"maintainAspectRatio": false,
"scales": {
"xAxes": [{
"display": true,
"type": "linear",
"ticks": {
"beginAtZero": true,
"min": 0,
"max": 100
}
}],
"yAxes": [{
"display": true,
"stacked": true,
"ticks": {
"padding": 10,
"beginAtZero": true,
"min": 0,
"max": 100
}
}]
}
}
};
var myChart = new Chart(ctx, config);
setInterval(addingData, 1000/24);
function addingData() {
mainData.push({x:x,y:y});
x += 0.1;
y = slope * x;
if (x % 10 === 0) {
points.push(y);
}
config.data.datasets[0].data = mainData;
myChart.update();
var img = new Image();
img.src = canvas.toDataURL('image/png',1.0)
img.onload = function () {
graphImage = img;
drawCanvas();
};
}
function drawCanvas(){
_ctx.drawImage(bg,0,0,600,400)
_ctx.drawImage(graphImage,0,0,300,200);
}

Precision in AmCharts stocklegend

I need to change precision to the values in the "stockLegend" property cause it shows over other values.
"stockLegend": {
"periodValueTextRegular": "[[value.average]]",
"spacing": 10
}

The value precision can be controlled by setting precision at the individual panel level or in panelsSettings if you want it set for all panels.
AmCharts.makeChart("chartdiv", {
// ...
panelsSettings: {
precision: 2, //global setting
// ...
},
// ...
panels: [{
// ...
precision: 1, //individual setting
// ...
},
// ...
],
// ...
});
Demo below set at the top panel:
var chartData1 = [];
var chartData2 = [];
generateChartData();
var chart = AmCharts.makeChart( "chartdiv", {
"type": "stock",
"theme": "light",
"dataSets": [ {
"title": "first data set",
"fieldMappings": [ {
"fromField": "value",
"toField": "value"
}, {
"fromField": "volume",
"toField": "volume"
} ],
"dataProvider": chartData1,
"categoryField": "date"
},
{
"title": "second data set",
"fieldMappings": [ {
"fromField": "value",
"toField": "value"
}, {
"fromField": "volume",
"toField": "volume"
} ],
"dataProvider": chartData2,
"compared": true,
"categoryField": "date"
}
],
"panels": [ {
"precision": 2,
"recalculateToPercents": false,
"showCategoryAxis": false,
"title": "Value",
"percentHeight": 70,
"stockGraphs": [ {
"id": "g1",
"valueField": "value",
"comparable": true,
"compareField": "value",
"balloonText": "[[title]]:<b>[[value]]</b>",
"compareGraphBalloonText": "[[title]]:<b>[[value]]</b>"
} ],
"stockLegend": {
"periodValueTextComparing": "[[percents.value.close]]%",
"periodValueTextRegular": "[[value.close]]"
}
},
{
"title": "Volume",
"percentHeight": 30,
"stockGraphs": [ {
"valueField": "volume",
"type": "column",
"showBalloon": false,
"fillAlphas": 1
} ],
"stockLegend": {
"periodValueTextRegular": "[[value.close]]"
}
}
],
"chartScrollbarSettings": {
"graph": "g1"
},
"chartCursorSettings": {
"valueBalloonsEnabled": true,
"fullWidth": true,
"cursorAlpha": 0.1,
"valueLineBalloonEnabled": true,
"valueLineEnabled": true,
"valueLineAlpha": 0.5
}
} );
function generateChartData() {
var firstDate = new Date();
firstDate.setDate( firstDate.getDate() - 500 );
firstDate.setHours( 0, 0, 0, 0 );
for ( var i = 0; i < 500; i++ ) {
var newDate = new Date( firstDate );
newDate.setDate( newDate.getDate() + i );
var a1 = Math.random() * 2;
var b1 = Math.round( Math.random() * ( 1000 + i ) ) + 500 + i * 2;
var a2 = Math.random() * 10;
var b2 = Math.round( Math.random() * ( 1000 + i ) ) + 600 + i * 2;
chartData1.push( {
"date": newDate,
"value": a1,
"volume": b1
} );
chartData2.push( {
"date": newDate,
"value": a2,
"volume": b2
} );
}
}
html, body {
width: 100%;
height: 100%;
margin: 0px;
}
#chartdiv {
width: 100%;
height: 100%;
}
<script src="//www.amcharts.com/lib/3/amcharts.js"></script>
<script src="//www.amcharts.com/lib/3/serial.js"></script>
<script src="//www.amcharts.com/lib/3/themes/light.js"></script>
<script src="//www.amcharts.com/lib/3/amstock.js"></script>
<div id="chartdiv"></div>

update amcharts data in angular-amcharts

I am using amchart to render a chart with JSON data which is an API response data,
and its working perfectly. Now I have to update the data on the basis of a selection dropdown which make a API call request to get the response JSON, which is also done now after getting the response data I don't know how to update the chart with the
$scope.changeYearFunction = function(){
console.log($scope.selectedYear);
chartService.getDataByMonth($scope.selectedYear).then(function(response){
$scope.monthdata = response.data;
$scope.$apply();
})
}
$scope.monthChart = function(year){
chartService.getDataByMonth('2016').then(function(response){
$scope.monthdata = response.data;
$scope.finishloading = true;
console.log($scope.monthdata);
$scope.amChartOptions = {
data : $scope.monthdata,
type: "serial",
theme: "light",
marginRight: 80,
balloon: {
cornerRadius: 6,
horizontalPadding: 15,
verticalPadding: 10
},
chartScrollbar: {
enabled: true,
},
valueAxes: [{
gridAlpha: 0.5,
gridColor: '#dddddd',
}],
graphs: [{
bullet: 'square',
bulletBorderAlpha: 1,
bulletBorderThickness: 1,
fillAlphas: 0.5,
//fillColorsField: 'lineColor',
legendValueText: '[[value]]',
//lineColorField: 'lineColor',
title: 'power',
valueField: 'power'
}],
chartCursor: {
//categoryBalloonDateFormat: 'MMM',
cursorAlpha: 0,
fullWidth: true
},
//dataDateFormat: "MM",
categoryField: "month",
export: {
enabled: true
}
}
})
}();
<div class="panel-heading"><span>Monthly Consumption</span>
<select ng-model="selectedYear" ng-change="changeYearFunction()">
<option ng-repeat="x in year" value={{x}}>{{x}}</option>
</select>
</div>
<div class="panel-body">
<div style="height: 450px; width: 100%;">
<am-chart ng-if="finishloading" id="myAreaChart" options="amChartOptions"></am-chart>
</div>
</div>

You can reset amchart with ng-if that already exist in your template. After data loaded you just $scope.amChartOptions.data = $scope.monthdata.
$scope.amChartOptions = {
data : [],
type: "serial",
theme: "light",
marginRight: 80,
balloon: {
cornerRadius: 6,
horizontalPadding: 15,
verticalPadding: 10
},
chartScrollbar: {
enabled: true,
},
valueAxes: [
{
gridAlpha: 0.5,
gridColor: '#dddddd',
}
],
graphs: [
{
bullet: 'square',
bulletBorderAlpha: 1,
bulletBorderThickness: 1,
fillAlphas: 0.5,
//fillColorsField: 'lineColor',
legendValueText: '[[value]]',
//lineColorField: 'lineColor',
title: 'power',
valueField: 'power'
}
],
chartCursor: {
//categoryBalloonDateFormat: 'MMM',
cursorAlpha: 0,
fullWidth: true
},
//dataDateFormat: "MM",
categoryField: "month",
export: {
enabled: true
};
$scope.changeYearFunction = function(){
$scope.finishloading = false;
console.log($scope.selectedYear);
chartService.getDataByMonth($scope.selectedYear).then(function(response){
$scope.monthdata = response.data;
$scope.finishloading = true;
$scope.amChartOptions.data = $scope.monthdata;
$scope.$apply();
})
}

Highchart and timeline does not work with large dataset

I have been working on a large dataset : http://jsfiddle.net/470bddfp/1/
It's about 2600 entries
I don't want to group data, but use zoomtype feature instead
Unfortunately it does not work, I just change selection, and I have empty data.
What is even worst, is when I use smaller dataset like I made in this exemple http://jsfiddle.net/470bddfp/2/ zoomtype is working !
$(function() {
var chart = new Highcharts.Chart({
chart: {
"renderTo": "container",
"zoomType": "x",
"panning": true,
"panKey": "shift"
},
plotOptions: {
"series": {
"states": {
"hover": {
"enabled": false
}
}
}
},
series: [{
"name": "First Timeline",
"type": "line",
"data": [
[1447608100000, 4.256],
[1447608070000, 4.471],
[1447608045000, 4.916],
[1447608042000, 2.946],
[1447608029000, 3.517],
[1447608003000, 5.801],
[1447607954000, 4.162],
[1447607924000, 2.415],
[1447607908000, 3.314],
[1447607898000, 2.765],
[1447607888000, 3.581],
[1447607861000, 7.016],
[1447607740000, 3.485],
[1447607719000, 4.264],
[1447607700000, 2.855],
[1447607694000, 3.142],
[1447607676000, 4.92],
[1447607613000, 2.899],
[1447607603000, 2.729],
[1447607594000, 4.054],
[1447607538000, 2.61],
[1447607526000, 2.43],
[1447607515000, 5.984],
[1447607467000, 2.529],
[1447607445000, 3.398],
[1447607391000, 4.9],
[1447607365000, 4.829],
[1447607310000, 2.935],
[1447607287000, 4.811],
[1447607242000, 4.897],
[1447607219000, 3.354],
[1447607157000, 5.929],
[1447607156000, 4.444],
[1447607128000, 6.542],
[1447607125000, 8.854],
[1447607121000, 5.693],
[1447607118000, 3.906],
[1447607092000, 2.843],
[1447607085000, 2.615],
[1447607076000, 2.651],
[1447607060000, 5.015],
[1447607057000, 2.441],
[1447607045000, 4.417],
[1447607015000, 5.198],
[1447607012000, 7.056],
[1447607006000, 4.014],
[1447606988000, 3.363],
[1447606965000, 2.329],
[1447606925000, 4.209],
[1447606922000, 4.095],
[1447606892000, 3.021],
[1447606879000, 4.54],
[1447606815000, 3.73],
[1447606783000, 7.097],
[1447606781000, 4.336],
[1447606732000, 2.786],
[1447606714000, 2.774],
[1447606675000, 6.027],
[1447606626000, 3.349],
[1447606576000, 3.147],
[1447606565000, 4.873],
[1447606518000, 4.064],
[1447606500000, 2.458],
[1447606484000, 2.601],
[1447606480000, 3.839],
[1447606429000, 5.348],
[1447606390000, 5.665],
[1447606287000, 7.904],
[1447606079000, 4.976],
[1447606055000, 5.577],
[1447606016000, 4.474],
[1447605931000, 5.43],
[1447605893000, 2.979],
[1447605889000, 6.101],
[1447605758000, 2.608],
[1447605757000, 5.77],
[1447605732000, 4.056],
[1447605701000, 5.834],
[1447605668000, 3.143],
[1447605665000, 2.924],
[1447605647000, 2.941],
[1447605631000, 3.544],
[1447605589000, 3.78],
[1447605566000, 7.102],
[1447605564000, 4.404],
[1447605563000, 5.95],
[1447605536000, 3.158],
[1447605499000, 2.618],
[1447605470000, 4.327],
[1447605456000, 4.384],
[1447605434000, 6.955],
[1447605307000, 3.632],
[1447605289000, 3.25],
[1447605276000, 3.711],
[1447605266000, 4.151],
[1447605224000, 4.985],
[1447605186000, 3.37],
[1447605163000, 2.553],
[1447605136000, 6.708],
[1447605042000, 6.076],
[1447604944000, 2.934],
[1447604923000, 6.721],
[1447604660000, 5.824],
[1447604608000, 4.777],
[1447604572000, 2.702],
[1447604560000, 3.34],
[1447604512000, 8.953],
[1447604509000, 7.409],
[1447604399000, 6.201],
[1447604327000, 2.912],
[1447604317000, 3.708],
[1447604280000, 4.575],
[1447604251000, 6.961],
[1447604248000, 3.878],
[1447604237000, 3.699],
[1447604232000, 4.066],
[1447604194000, 2.265],
[1447604182000, 4.943],
[1447604135000, 2.764],
[1447604132000, 7.494],
[1447603986000, 6.042],
[1447603983000, 3.071],
[1447603948000, 5.029],
[1447603887000, 7.517],
[1447603762000, 6.409],
[1447603758000, 4.375],
[1447603729000, 6.743],
[1447603584000, 2.78],
[1447603561000, 5.06],
[1447603536000, 5.109],
[1447603499000, 3.178],
[1447603433000, 6.729],
[1447603368000, 4.771],
[1447603278000, 4.775],
[1447603256000, 2.522],
[1447603242000, 6.729],
[1447603065000, 5.433],
[1447603016000, 3.842],
[1447602983000, 7.156],
[1447602780000, 7.057],
[1447602609000, 5.594],
[1447602566000, 6.967],
[1447602420000, 4.171],
[1447602345000, 5.094],
[1447602311000, 3.869],
[1447602293000, 4.59],
[1447602290000, 2.944],
[1447602271000, 6.146],
[1447602174000, 2.749],
[1447602161000, 2.713],
[1447602116000, 7.074],
[1447602065000, 3.175],
[1447602053000, 3.326],
[1447601987000, 3.973],
[1447601984000, 5.376],
[1447601933000, 3.106],
[1447601899000, 6.304],
[1447601822000, 2.749],
[1447601773000, 5.92],
[1447601650000, 7.701],
[1447601547000, 2.893],
[1447601532000, 3.036],
[1447601523000, 6.992],
[1447601392000, 7.213],
[1447601061000, 6.555],
[1447600809000, 5.283],
[1447600771000, 4.829],
[1447600748000, 2.75],
[1447600719000, 5.896],
[1447600632000, 4.905],
[1447600607000, 2.821],
[1447600583000, 2.98],
[1447600582000, 4.549],
[1447600568000, 4.821],
[1447600527000, 3.244],
[1447600521000, 6.498],
[1447600404000, 4.902],
[1447600380000, 5.754],
[1447600287000, 4.958],
[1447600250000, 3.106],
[1447600235000, 2.655],
[1447600231000, 3.266],
[1447600194000, 5.529],
[1447600152000, 4.377],
[1447600086000, 3.799],
[1447600083000, 3.085],
[1447600072000, 5.024],
[1447600036000, 4.372],
[1447600024000, 2.653],
[1447600024000, 3.836],
[1447600015000, 3.173],
[1447600007000, 5.187],
[1447599920000, 3.063],
[1447599914000, 3.986],
[1447599898000, 4.572],
[1447599817000, 4.282],
[1447599807000, 4.841],
[1447599802000, 4.515],
[1447599764000, 2.617],
[1447599749000, 2.932],
[1447599724000, 7.049],
[1447599720000, 4.841],
[1447599695000, 6.434],
[1447599692000, 3.248],
[1447599687000, 3.738],
[1447599680000, 4.174],
[1447599625000, 4.691],
[1447599575000, 3.657],
[1447599561000, 3.93],
[1447599506000, 7.645],
[1447599243000, 7.372],
[1447599242000, 5.109],
[1447599212000, 3.965],
[1447599188000, 3.358],
[1447599177000, 5.133],
[1447599177000, 2.737],
[1447599168000, 3.591],
[1447599104000, 3.627],
[1447599094000, 4.185],
[1447599079000, 4.75],
[1447599040000, 3.388],
[1447599029000, 2.608],
[1447599020000, 2.721],
[1447598998000, 3.548],
[1447598983000, 4.117],
[1447598967000, 3.311],
[1447598953000, 4.011],
[1447598911000, 3.208],
[1447598886000, 4.261],
[1447598878000, 5.554],
[1447598845000, 4.951],
[1447598783000, 4.79],
[1447598728000, 4.677],
[1447598665000, 3.013],
[1447598648000, 3.199],
[1447598630000, 5.953],
[1447598556000, 2.935],
[1447598549000, 3.082],
[1447598521000, 4.991],
[1447598493000, 5.14]
],
"tooltip": {
"valueSuffix": " secondes"
}
}],
title: {
"text": "Temps de r\u00e9ponse de RISe"
},
xAxis: [{
"type": "datetime",
"dateTimeLabelFormats": {
"hours": "%H:%M"
}
}],
yAxis: {
"labels": {
"format": "{value}s"
},
"title": {
"text": null
},
"min": 0,
"max": 9
},
});
});
I didn't found anything in documentation relating on limitations for zoomtype
Thanks by advance for any help