# 2D Histogram Contour in JavaScript

How to make D3.js-based 2D Histogram Contour plots in Plotly.js.

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Plotly is a free and open-source graphing library for JavaScript. We recommend you read our Getting Started guide for the latest installation or upgrade instructions, then move on to our Plotly Fundamentals tutorials or dive straight in to some Basic Charts tutorials.

### Basic 2D Histogram Contour

var x = [];
var y = [];
for (var i = 0; i < 500; i ++) {
x[i] = Math.random();
y[i] = Math.random() + 1;
}

var data = [
{
x: x,
y: y,
type: 'histogram2dcontour'
}
];
Plotly.newPlot('myDiv', data);


### 2D Histogram Contour Colorscale

var x = [];
var y = [];
for (var i = 0; i < 500; i ++) {
x[i] = Math.random();
y[i] = Math.random() + 1;
}

var data = [
{
x: x,
y: y,
colorscale: 'Blues',
type: 'histogram2dcontour'
}
];
Plotly.newPlot('myDiv', data);


### Styled 2D Histogram Contour

var x = [];
var y = [];
for (var i = 0; i < 500; i ++) {
x[i] = Math.random();
y[i] = Math.random() + 1;
}

var data = [
{
x: x,
y: y,
colorscale: 'Blues',
type: 'histogram2dcontour',
contours: {
showlabels: true,
labelfont: {
family: 'Raleway',
color: 'white'
}
},
hoverlabel: {
bgcolor: 'white',
bordercolor: 'black',
font: {
family: 'Raleway',
color: 'black'
}
}
}
];
Plotly.newPlot('myDiv', data);