Bubble Charts in JavaScript

How to make a D3.js-based bubble chart in javascript. Examples of scatter charts whose markers have variable color, size, and symbols.


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var trace1 = {
  x: [1, 2, 3, 4],
  y: [10, 11, 12, 13],
  mode: 'markers',
  marker: {
    size: [40, 60, 80, 100]
  }
};

var data = [trace1];

var layout = {
  title: 'Marker Size',
  showlegend: false,
  height: 600,
  width: 600
};

Plotly.newPlot('myDiv', data, layout);
var trace1 = {
  x: [1, 2, 3, 4],
  y: [10, 11, 12, 13],
  mode: 'markers',
  marker: {
    color: ['rgb(93, 164, 214)', 'rgb(255, 144, 14)',  'rgb(44, 160, 101)', 'rgb(255, 65, 54)'],
    opacity: [1, 0.8, 0.6, 0.4],
    size: [40, 60, 80, 100]
  }
};

var data = [trace1];

var layout = {
  title: 'Marker Size and Color',
  showlegend: false,
  height: 600,
  width: 600
};

Plotly.newPlot('myDiv', data, layout);
var trace1 = {
  x: [1, 2, 3, 4],
  y: [10, 11, 12, 13],
  text: ['A<br>size: 40', 'B<br>size: 60', 'C<br>size: 80', 'D<br>size: 100'],
  mode: 'markers',
  marker: {
    color: ['rgb(93, 164, 214)', 'rgb(255, 144, 14)',  'rgb(44, 160, 101)', 'rgb(255, 65, 54)'],
    size: [40, 60, 80, 100]
  }
};

var data = [trace1];

var layout = {
  title: 'Bubble Chart Hover Text',
  showlegend: false,
  height: 600,
  width: 600
};

Plotly.newPlot('myDiv', data, layout);
// To scale the bubble size, use the attribute sizeref. We recommend using the following formula to calculate a sizeref value:
// sizeref = 2.0 * Math.max(...size) / (desired_maximum_marker_size**2)
// Note that setting 'sizeref' to a value greater than 1, decreases the rendered marker sizes, while setting 'sizeref' to less than 1, increases the rendered marker sizes. See https://plotly.com/python/reference/#scatter-marker-sizeref for more information. Additionally, we recommend setting the sizemode attribute: https://plotly.com/python/reference/#scatter-marker-sizemode to area.

var trace1 = {
  x: [1, 2, 3, 4],
  y: [10, 11, 12, 13],
  text: ['A<br>size: 40', 'B<br>size: 60', 'C<br>size: 80', 'D<br>size: 100'],
  mode: 'markers',
  marker: {
    size: [400, 600, 800, 1000],
    sizemode: 'area'
  }
};

var trace2 = {
  x: [1, 2, 3, 4],
  y: [14, 15, 16, 17],
  text: ['A</br>size: 40</br>sixeref: 0.2', 'B</br>size: 60</br>sixeref: 0.2', 'C</br>size: 80</br>sixeref: 0.2', 'D</br>size: 100</br>sixeref: 0.2'],
  mode: 'markers',
  marker: {
    size: [400, 600, 800, 1000],
    //setting 'sizeref' to lower than 1 decreases the rendered size
    sizeref: 2,
    sizemode: 'area'
  }
};

var trace3 = {
  x: [1, 2, 3, 4],
  y: [20, 21, 22, 23],
  text: ['A</br>size: 40</br>sixeref: 2', 'B</br>size: 60</br>sixeref: 2', 'C</br>size: 80</br>sixeref: 2', 'D</br>size: 100</br>sixeref: 2'],
  mode: 'markers',
  marker: {
    size: [400, 600, 800, 1000],
    //setting 'sizeref' to less than 1, increases the rendered marker sizes
    sizeref: 0.2,
    sizemode: 'area'
  }
};

// sizeref using above forumla
var desired_maximum_marker_size = 40;
var size = [400, 600, 800, 1000];
var trace4 = {
  x: [1, 2, 3, 4],
  y: [26, 27, 28, 29],
  text: ['A</br>size: 40</br>sixeref: 1.25', 'B</br>size: 60</br>sixeref: 1.25', 'C</br>size: 80</br>sixeref: 1.25', 'D</br>size: 100</br>sixeref: 1.25'],
  mode: 'markers',
  marker: {
    size: size,
    //set 'sizeref' to an 'ideal' size given by the formula sizeref = 2. * max(array_of_size_values) / (desired_maximum_marker_size ** 2)
    sizeref: 2.0 * Math.max(...size) / (desired_maximum_marker_size**2),
    sizemode: 'area'
  }
};

var data = [trace1, trace2, trace3, trace4];

var layout = {
  title: 'Bubble Chart Size Scaling',
  showlegend: false,
  height: 600,
  width: 600
};

Plotly.newPlot('myDiv', data, layout);
var trace1 = {
  x: [1, 2, 3, 4],
  y: [10, 11, 12, 13],
  mode: 'markers',
  marker: {
    color: ['hsl(0,100,40)', 'hsl(33,100,40)', 'hsl(66,100,40)', 'hsl(99,100,40)'],
    size: [12, 22, 32, 42],
    opacity: [0.6, 0.7, 0.8, 0.9]
  },
  type: 'scatter'
};

var trace2 = {
  x: [1, 2, 3, 4],
  y: [11, 12, 13, 14],
  mode: 'markers',
  marker: {
    color: 'rgb(31, 119, 180)',
    size: 18,
    symbol: ['circle', 'square', 'diamond', 'cross']
  },
  type: 'scatter'
};

var trace3 = {
  x: [1, 2, 3, 4],
  y: [12, 13, 14, 15],
  mode: 'markers',
  marker: {
    size: 18,
    line: {
      color: ['rgb(120,120,120)', 'rgb(120,120,120)', 'red', 'rgb(120,120,120)'],
      width: [2, 2, 6, 2]
    }
  },
  type: 'scatter'
};

var data = [trace1, trace2, trace3];

var layout = {showlegend: false};

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