I'm using the amcharts library to create stock charts. Here's my progress so far: https://i.sstatic.net/NVX8P.png
And here's my desired outcome: https://i.sstatic.net/8eIZh.png
Upon comparing both images, you'll notice that I have successfully implemented cylindrical and moving average graphs (dashed lines), but I'm struggling to add spikes at the bottom of the graph like in the original image (pink and orange colors). I'm unsure how to incorporate these spikes into the stock graph as my data is dynamic, making it challenging to create a js fiddle. However, I am able to provide my function here-
function load_stock_graph(graph_type, history, title, aggregate){
// DEFINE CHART PLUGINS
AmCharts.averageGraphs = 0;
AmCharts.addMovingAverage = function (dataSet, panel, field, aggregate, col ,graph) {
// update dataset
var avgField = "avg"+AmCharts.averageGraphs;
dataSet.fieldMappings.push({
fromField: avgField,
toField: avgField});
// calculate moving average
var fc = 0;
var sum = 0;
for (var i = 0; i < dataSet.dataProvider.length; i++) {
// console.log(aggregate[i].ema_0008)
var dp = dataSet.dataProvider[i];
if (dp[field] !== undefined) {
sum += dp[field];
fc++;
if (aggregate[i] !== undefined){
if(col == '08'){
dp[avgField] = aggregate[i].ema_0008;
}else if(col == '15'){
dp[avgField] = aggregate[i].ema_0015;
}else if(col == '20'){
dp[avgField] = aggregate[i].ema_0020;
}
}
}
}
// create a graph
graph.valueField = avgField;
panel.stockGraphs.push(graph);
// increment average graph count
AmCharts.averageGraphs++;
}
// CHART DATA
var chartData = [];
var chartData1 = [];
generateChartData(history);
function generateChartData(history) {
var firstDate = new Date();
firstDate.setHours(0, 0, 0, 0);
firstDate.setDate(firstDate.getDate() - 2000);
for (var i = 0; i < history.length; i++) {
var date = new Date(history[i].date);
var val = Math.round(Math.random() * (30) + 100);
chartData[i] = ({
date: date,
open: history[i].open,
close: history[i].close,
high: history[i].high,
low: history[i].low,
volume: history[i].volume,
value: val
});
}
}
// CHART CONFIG
var chartConfig = {
type: "stock",
pathToImages : "/static/img/amcharts/",
dataSets: [{
fieldMappings: [{
fromField: "open",
toField: "open"
}, {
fromField: "close",
toField: "close"
}, {
fromField: "high",
toField: "high"
}, {
fromField: "low",
toField: "low"
}, {
fromField: "volume",
toField: "volume"
}, {
fromField: "value",
toField: "val"
}],
color: "#fff",
dataProvider: chartData,
title: title,
categoryField: "date",
compared: false,
},
{
fieldMappings: [{
fromField: "value",
toField: "value"
}],
color: "#fff",
dataProvider: chartData,
title: title,
categoryField: "date"
},
],
panels: [{
title: "Value",
percentHeight: 70,
stockGraphs: [{type: graph_type,
id: "g1",
openField: "open",
closeField: "close",
highField: "high",
lowField: "low",
valueField: "close",
lineColor: "#fff",
fillColors: "#fff",
negativeLineColor: "#db4c3c",
negativeFillColors: "#db4c3c",
fillAlphas: 1,
comparedGraphLineThickness: 2,
columnWidth: 0.7,
useDataSetColors: false,
comparable: true,
compareField: "close",
showBalloon: false,
//proCandlesticks: true
} ],
stockLegend: {
valueTextRegular: undefined,
periodValueTextComparing: "[[percents.value.close]]%"
}
},
{
title: "Volume",
percentHeight: 40,
marginTop: 1,
columnWidth: 0.6,
showCategoryAxis: false,
valueAxes: [{
usePrefixes: true
}],
stockGraphs: [ {
valueField: "volume",
openField: "open",
type: "column",
showBalloon: false,
fillAlphas: 1,
lineColor: "#fff",
fillColors: "#fff",
negativeLineColor: "#db4c3c",
negativeFillColors: "#db4c3c",
useDataSetColors: false,
} ],
stockLegend: {
markerType: "none",
markerSize: 0,
labelText: "",
periodValueTextRegular: "[[value.close]]"
}
}
],
panelsSettings: {
color: "#fff",
plotAreaFillColors: "#333",
plotAreaFillAlphas: 1,
marginLeft: 60,
marginTop: 5,
marginBottom: 5
},
chartScrollbarSettings: {
graph: "g1",
graphType: "line",
usePeriod: "WW",
backgroundColor: "#333",
graphFillColor: "#666",
graphFillAlpha: 0.5,
gridColor: "#555",
gridAlpha: 1,
selectedBackgroundColor: "#444",
selectedGraphFillAlpha: 1
},
categoryAxesSettings: {
equalSpacing: true,
gridColor: "#555",
gridAlpha: 1
},
valueAxesSettings: {
gridColor: "#555",
gridAlpha: 1,
inside: false,
showLastLabel: true
},
chartCursorSettings: {
pan: true,
valueLineEnabled:true,
valueLineBalloonEnabled:true
},
legendSettings: {
color: "#fff"
},
stockEventsSettings: {
showAt: "high"
},
balloon: {
textAlign: "left",
offsetY: 10
},
periodSelector: {
position: "bottom",
periods: [ {
period: "DD",
count: 10,
label: "10D"
}, {
period: "MM",
count: 1,
label: "1M"
}, {
period: "MM",
count: 6,
selected: true,
label: "6M"
}, {
period: "YYYY",
count: 1,
label: "1Y"
}, {
period: "YYYY",
count: 2,
label: "2Y"
}, {
period: "YTD",
label: "YTD"
}, {
period: "MAX",
label: "MAX"
} ]
},
"export": {
"enabled": true,
"backgroundColor": "#fff",
"dataDateFormat": "YYYY-MM-DD"
}
}
// ADD INDICATORS
// ema_0008
AmCharts.addMovingAverage(chartConfig.dataSets[0], chartConfig.panels[0], 'value',aggregate, '08', {
useDataSetColors: false,
color: "#ccffcc",
lineColor: "#F4F009",
title: "aggregate ema 0008",
dashLength: 3
});
// ema_0015
AmCharts.addMovingAverage(chartConfig.dataSets[0], chartConfig.panels[0], 'value',aggregate, '15',{
useDataSetColors: false,
color: "#ccffcc",
lineColor: "#2C7F1D",
title: "aggregate ema 0015",
dashLength: 3
});
// ema_0020
AmCharts.addMovingAverage(chartConfig.dataSets[0], chartConfig.panels[0], 'value',aggregate, '20',{
useDataSetColors: false,
color: "#ccffcc",
lineColor: "#A109E8",
title: "aggregate ema 0020",
dashLength: 3
});
// Empty chart instance so that chart loaded via ajax can work correctly
AmCharts.charts = [];
// CREATE CHART
var chart = AmCharts.makeChart("chartdiv", chartConfig);
}