Plotly.js

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Plotly.js is a charting library that comes with many different chart types:

Horizontal and Vertical Bar Charts
Pie and Donut Charts
Line Charts
Scatter and Bubble Plots
Equation Plots
3D Charts
Statistical Graphs
SVG Maps
and more ...

Plotly.js is free and open-source under the MIT license. It costs nothing to install and use. You can view the source, report issues and contribute using Github.

Bar Charts

Source Code

const xArray = ["Italy","France","Spain","USA","Argentina"];
const yArray = [55, 49, 44, 24, 15];

const data = [{
  x: xArray,
  y: yArray,
  type: "bar",
  orientation:"v",
  marker: {color:"rgba(0,0,255)"}
}];

const layout = {title:"World Wide Wine Production"};

Plotly.newPlot("myPlot", data, layout);

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Horizontal Bar Charts

Source Code

const xArray = [55, 49, 44, 24, 15];
const yArray = ["Italy","France","Spain","USA","Argentina"];

const data = [{
  x: xArray,
  y: yArray,
  type: "bar",
  orientation: "h",
  marker: {color:"rgba(255,0,0,0.6)"}
}];

const layout = {title:"World Wide Wine Production"};

Plotly.newPlot("myPlot", data, layout);

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Pie Charts

To display a pie instead of bars, change x and y to labels and values, and change the type to "pie":

const data = [{
  labels: xArray,
  values: yArray,
  type: "pie"
}];

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Donut Charts

To display a donut instead of a pie, add a hole:

const data = [{
  labels: xArray,
  values: yArray,
  hole: .4,
  type: "pie"
}];

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Plotting Equations

Source Code

let exp = "Math.sin(x)";

// Generate values
const xValues = [];
const yValues = [];
for (let x = 0; x <= 10; x += 0.1) {
xValues.push(x);
yValues.push(eval(exp));
}

// Display using Plotly
const data = [{x:xValues, y:yValues, mode:"lines"}];
const layout = {title: "y = " + exp};
Plotly.newPlot("myPlot", data, layout);

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To display scatters instead, change mode to markers:

// Display using Plotly
const data = [{x:xValues, y:yValues, mode:"markers"}];
const layout = {title: "y = " + exp};
Plotly.newPlot("myPlot", data, layout);

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Scatter Plots

Source Code

const xArray = [50,60,70,80,90,100,110,120,130,140,150];
const yArray = [7,8,8,9,9,9,10,11,14,14,15];

// Define Data
const data = [{
  x: xArray,
  y: yArray,
  mode:"markers",
  type:"scatter"
}];

// Define Layout
const layout = {
  xaxis: {range: [40, 160], title: "Square Meters"},
  yaxis: {range: [5, 16], title: "Price in Millions"},
  title: "House Prices vs. Size"
};

Plotly.newPlot("myPlot", data, layout);

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Line Graphs

Source Code

const xArray = [50,60,70,80,90,100,110,120,130,140,150];
const yArray = [7,8,8,9,9,9,10,11,14,14,15];

// Define Data
const data = [{
  x: xArray,
  y: yArray,
  mode: "lines",
  type: "scatter"
}];

// Define Layout
const layout = {
  xaxis: {range: [40, 160], title: "Square Meters"},
  yaxis: {range: [5, 16], title: "Price in Millions"},
  title: "House Prices vs Size"
};

// Display using Plotly
Plotly.newPlot("myPlot", data, layout);

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Bubble Plots

Bubble Plots are Scatter Plots whose markers have variable color, size, and symbols.

It is a type of 3-dimensional chart with only two axes (x and y) where the size of the bubble communicates the third dimention.

Source Code

const xArray = [1,2,3,4];
const yArray = [10,20,30,40];

const trace1 = {
  x: xArray,
  y: yArray,
  mode: 'markers',
  marker: {
    color: ['red', 'green', 'blue', 'orange'],
    size: [20, 30, 40, 50]
  }
};

const data = [trace1];

const layout = {
  title: "Plotting Bubbles"
};

Plotly.newPlot('myPlot', data, layout);

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Linear Graphs

Source Code

let exp = "x + 17";

// Generate values
const xValues = [];
const yValues = [];
for (let x = 0; x <= 10; x += 1) {
  yValues.push(eval(exp));
  xValues.push(x);
}

// Define Data
const data = [{
  x: xValues,
  y: yValues,
  mode: "lines"
}];

// Define Layout
const layout = {title: "y = " + exp};

// Display using Plotly
Plotly.newPlot("myPlot", data, layout);

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Multiple Lines

Source Code

let exp1 = "x";
let exp2 = "1.5*x";
let exp3 = "1.5*x + 7";

// Generate values
const x1Values = [];
const x2Values = [];
const x3Values = [];
const y1Values = [];
const y2Values = [];
const y3Values = [];

for (let x = 0; x <= 10; x += 1) {
  x1Values.push(x);
  x2Values.push(x);
  x3Values.push(x);
  y1Values.push(eval(exp1));
  y2Values.push(eval(exp2));
  y3Values.push(eval(exp3));
}

// Define Data
const data = [
  {x: x1Values, y: y1Values, mode:"lines"},
  {x: x2Values, y: y2Values, mode:"lines"},
  {x: x3Values, y: y3Values, mode:"lines"}
];

// Define Layout
const layout = {title: "[y=" + exp1 + "] [y=" + exp2 + "] [y=" + exp3 + "]"};

// Display using Plotly
Plotly.newPlot("myPlot", data, layout);

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