Bubble HeatMap in ASP.NET CORE HeatMap Chart Component

13 Mar 202424 minutes to read

Data points represent the data source values with gradient or fixed colors in the HeatMap. You can customize the appearance of these data points by changing the color and size attributes.

The data points can be represented in color fill or bubble shape by defining the tileType property. By default, the data points are color filled with gradient or fixed colors and this depiction of data points is defined as Rect in the tileType property.

The cell customizations and color mapping for rect tile type is defined in appearance and palette sections in detail.

Bubble types

The data points can be represented in the bubble along with its attributes by setting the tileType property to Bubble.

In bubble HeatMap, you can display the data points with bubble size, bubble colors, and sector attributes of the bubble.

Bubble size

In this bubble HeatMap type, the size factor of the bubble is used to denote the data variations. The radius of the bubble varies according to data values.

By default, the bubble with small size denotes the data value with small magnitude and the larger bubble size denotes the data value with larger magnitude. This behavior can be inversed by using the isInversedbubblesize property.

To render a bubble HeatMap with size series, set the bubbleType property to Size.

<ejs-heatmap id='container' dataSource="ViewBag.dataSource">
    <e-heatmap-titlesettings text="Sales Revenue per Employee (in 1000 US$)" textStyle="ViewBag.textStyle">
    </e-heatmap-titlesettings>
    <e-heatmap-xaxis labels="ViewBag.xLabels">
    </e-heatmap-xaxis>
    <e-heatmap-yaxis labels="ViewBag.yLabels">
    </e-heatmap-yaxis>
    <e-heatmap-palettesettings type="Gradient">
        <e-palettes>
            <e-palette color="#C06C84"></e-palette>
            <e-palette color="#6C5B7B"></e-palette>
            <e-palette color="#355C7D"></e-palette>
        </e-palettes>
    </e-heatmap-palettesettings>
    <e-heatmap-cellsettings showLabel="false" tileType="Bubble" bubbleType="Size"></e-heatmap-cellsettings>
    <e-heatmap-legendsettings visible="true"></e-heatmap-legendsettings>
</ejs-heatmap>
public ActionResult Gradient()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
         };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = new int[,]
            {
                {73, 39, 26, 39, 94, 0},
                {93, 58, 53, 38, 26, 68},
                {99, 28, 22, 4, 66, 90},
                {14, 26, 97, 69, 69, 3},
                {7, 46, 47, 47, 88, 6},
                {41, 55, 73, 23, 3, 79},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

ASP.NET Core HeatMap chart with Size bubble type

Bubble color

In HeatMap, defined with this tile type, the data points will be represented with same sized bubbles and the data value variations are represented with the bubble colors.

To represent the data points with variations in bubble colors, set the bubbleType property to Color.

<ejs-heatmap id='container' dataSource="ViewBag.dataSource">
    <e-heatmap-titlesettings text="Sales Revenue per Employee (in 1000 US$)" textStyle="ViewBag.textStyle">
    </e-heatmap-titlesettings>
    <e-heatmap-xaxis labels="ViewBag.xlabels">
    </e-heatmap-xaxis>
    <e-heatmap-yaxis labels="ViewBag.ylabels">
    </e-heatmap-yaxis>
    <e-heatmap-palettesettings type="Gradient">
        <e-palettes>
            <e-palette color="#C06C84"></e-palette>
            <e-palette color="#6C5B7B"></e-palette>
            <e-palette color="#355C7D"></e-palette>
        </e-palettes>
    </e-heatmap-palettesettings>
    <e-heatmap-cellsettings tileType="Bubble" bubbleType="Color"></e-heatmap-cellsettings>
    <e-heatmap-legendsettings visible="true"></e-heatmap-legendsettings>
</ejs-heatmap>
public ActionResult Gradient()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
         };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = new int[,]
            {
                {73, 39, 26, 39, 94, 0},
                {93, 58, 53, 38, 26, 68},
                {99, 28, 22, 4, 66, 90},
                {14, 26, 97, 69, 69, 3},
                {7, 46, 47, 47, 88, 6},
                {41, 55, 73, 23, 3, 79},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

ASP.NET Core HeatMap chart with Color bubble type

Bubble sector

In this bubble HeatMap type, the sector of the bubble decides the magnitude of data point. If the sector is large, then the data point value will be high.

To render the data points with bubble sector, set the bubbleType property to Sector.

<ejs-heatmap id='container' dataSource="ViewBag.dataSource">
    <e-heatmap-titlesettings text="Sales Revenue per Employee (in 1000 US$)" textStyle="ViewBag.textStyle">
    </e-heatmap-titlesettings>
    <e-heatmap-xaxis labels="ViewBag.xLabels">
    </e-heatmap-xaxis>
    <e-heatmap-yaxis labels="ViewBag.yLabels">
    </e-heatmap-yaxis>
    <e-heatmap-palettesettings type="Gradient">
        <e-palettes>
            <e-palette color="#C06C84"></e-palette>
            <e-palette color="#6C5B7B"></e-palette>
            <e-palette color="#355C7D"></e-palette>
        </e-palettes>
    </e-heatmap-palettesettings>
    <e-heatmap-cellsettings tileType="Bubble" bubbleType="Sector"></e-heatmap-cellsettings>
    <e-heatmap-legendsettings visible="true"></e-heatmap-legendsettings>
</ejs-heatmap>
public ActionResult Gradient()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
         };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = new int[,]
            {
                {73, 39, 26, 39, 94, 0},
                {93, 58, 53, 38, 26, 68},
                {99, 28, 22, 4, 66, 90},
                {14, 26, 97, 69, 69, 3},
                {7, 46, 47, 47, 88, 6},
                {41, 55, 73, 23, 3, 79},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

ASP.NET Core HeatMap chart with Sector bubble type

Combining size and color bubble types

In this bubble HeatMap type, size and color of the bubble represents the data value variation. To render this bubble HeatMap type, set the bubbleType property to SizeAndColor.

The following examples demonstrate different data binding with the SizeAndColor bubble type set in the HeatMap.

Array binding

When an array of numbers is specified as the data source, the bubble HeatMap can be rendered with different sizes and colors depending on the bound data.

Table

The following example illustrates how to render a bubble HeatMap with different sizes and colors using array table binding.

<ejs-heatmap id='container' load="window.onHeatmapLoad" tooltipRender="window.ontooltipRender" showTooltip="true">
    <e-heatmap-titlesettings text="Commercial Aviation Accidents and Fatalities by year 2012 - 2017"
        textStyle="ViewBag.textStyle">
    </e-heatmap-titlesettings>
    <e-heatmap-xaxis labels="ViewBag.xLabels">
    </e-heatmap-xaxis>
    <e-heatmap-yaxis labels="ViewBag.yLabels">
    </e-heatmap-yaxis>
    <e-heatmap-palettesettings type="Gradient">
        <e-palettes>
            <e-palette color="#C06C84"></e-palette>
            <e-palette color="#6C5B7B"></e-palette>
            <e-palette color="#355C7D"></e-palette>
        </e-palettes>
    </e-heatmap-palettesettings>
    <e-heatmap-cellsettings tileType="Bubble" bubbleType="SizeAndColor"></e-heatmap-cellsettings>
    <e-heatmap-datasourcesettings isJsonData="false" adaptorType="Table"></e-heatmap-datasourcesettings>
    <e-heatmap-legendsettings visible="true"></e-heatmap-legendsettings>
</ejs-heatmap>

<script>
    var dataSource = [
        [[4, 39], [3, 8], [1, 3], [1, 10], [4, 4], [2, 15]],
        [[4, 28], [5, 92], [5, 73], [3, 1], [3, 4], [4, 126]],
        [[4, 45], [5, 152], [0, 44], [4, 54], [5, 243], [2, 45]]
    ];
    window.onHeatmapLoad = function (args) {
        args.heatmap.dataSource = dataSource;
    }
    window.ontooltipRender = function (args) {
        args.content = ['Year ' + ' : ' + args.xLabel + '<br/>' + 'Months ' + ' : ' + args.yLabel + '<br/>'
            + 'Accidents ' + ' : ' + args.value[0].bubbleData + '<br/>' + 'Fatalities ' + ' : '
            + args.value[1].bubbleData];
    }
</script>
public ActionResult Gradient()
{
            ViewBag.textStyle = new
            {
                size = "15px",
                fontWeight = "500",
                fontStyle = "Normal",
                fontFamily = "Segoe UI"
            };
            ViewBag.border = new
            {
                color = "red",
                opacity = 1
            };
            string[] xlabels = new string[3] { "2017", "2016", "2015" };
            ViewBag.xLabels = xlabels;
            string[] yLabels = new string[6] { "Jan-Feb", "Mar-Apr", "May-Jun", "Jul-Aug", "Sep-Oct", "Nov-Dec" };
            ViewBag.yLabels = yLabels;
            return View();
}

Bubble HeatMap with size and color combined and rendered with array data and table adaptor type

Cell

The following example illustrates how to render a bubble HeatMap with different sizes and colors using array cell binding.

<ejs-heatmap id='container' load="window.onHeatmapLoad" tooltipRender="window.ontooltipRender" showTooltip="true">
    <e-heatmap-titlesettings text="Commercial Aviation Accidents and Fatalities by year 2012 - 2017"
        textStyle="ViewBag.textStyle">
    </e-heatmap-titlesettings>
    <e-heatmap-xaxis labels="ViewBag.xLabels">
    </e-heatmap-xaxis>
    <e-heatmap-yaxis labels="ViewBag.yLabels">
    </e-heatmap-yaxis>
    <e-heatmap-palettesettings type="Gradient">
        <e-palettes>
            <e-palette color="#C06C84"></e-palette>
            <e-palette color="#6C5B7B"></e-palette>
            <e-palette color="#355C7D"></e-palette>
        </e-palettes>
    </e-heatmap-palettesettings>
    <e-heatmap-cellsettings tileType="Bubble" bubbleType="SizeAndColor"></e-heatmap-cellsettings>
    <e-heatmap-datasourcesettings isJsonData="false" adaptorType="Cell"></e-heatmap-datasourcesettings>
    <e-heatmap-legendsettings visible="true"></e-heatmap-legendsettings>
</ejs-heatmap>

<script>
    var dataSource = [
        [0, 0, [4, 39]], [0, 1, [3, 8]], [0, 2, [1, 3]], [0, 3, [1, 10]], [0, 4, [4, 4]], [0, 5, [2, 15]],
        [1, 0, [4, 28]], [1, 1, [5, 92]], [1, 2, [5, 73]], [1, 3, [3, 1]], [1, 4, [3, 4]], [1, 5, [4, 126]],
        [2, 0, [4, 45]], [2, 1, [5, 152]], [2, 2, [0, 44]], [2, 3, [4, 54]], [2, 4, [5, 243]], [2, 5, [2, 45]]
    ];
    window.onHeatmapLoad = function (args) {
        args.heatmap.dataSource = dataSource;
    }
    window.ontooltipRender = function (args) {
        args.content = ['Year ' + ' : ' + args.xLabel + '<br/>' + 'Months ' + ' : ' + args.yLabel + '<br/>'
            + 'Accidents ' + ' : ' + args.value[0].bubbleData + '<br/>' + 'Fatalities ' + ' : '
            + args.value[1].bubbleData];
    }
</script>
public ActionResult Gradient()
{
            ViewBag.textStyle = new
            {
                size = "15px",
                fontWeight = "500",
                fontStyle = "Normal",
                fontFamily = "Segoe UI"
            };
            ViewBag.border = new
            {
                color = "red",
                opacity = 1
            };
            string[] xlabels = new string[3] { "2017", "2016", "2015" };
            ViewBag.xLabels = xlabels;
            string[] yLabels = new string[6] { "Jan-Feb", "Mar-Apr", "May-Jun", "Jul-Aug", "Sep-Oct", "Nov-Dec" };
            ViewBag.yLabels = yLabels;
            return View();
}

Bubble HeatMap with size and color combined and rendered with array data and cell adaptor type

JSON binding

When a list of JSON objects are specified as data source, the bubble HeatMap can be rendered with different sizes and colors depending on the bound data.

Table

The following example illustrates how to render a bubble HeatMap with different sizes and colors using JSON table binding.

<ejs-heatmap id='container' load="window.onHeatmapLoad" tooltipRender="window.ontooltipRender" showTooltip="true">
  <e-heatmap-titlesettings text="Commercial Aviation Accidents and Fatalities by year 2012 - 2017"
    textStyle="ViewBag.textStyle">
  </e-heatmap-titlesettings>
  <e-heatmap-xaxis labels="ViewBag.xLabels">
  </e-heatmap-xaxis>
  <e-heatmap-yaxis labels="ViewBag.yLabels">
  </e-heatmap-yaxis>
  <e-heatmap-palettesettings type="Gradient">
    <e-palettes>
      <e-palette color="#C06C84"></e-palette>
      <e-palette color="#6C5B7B"></e-palette>
      <e-palette color="#355C7D"></e-palette>
    </e-palettes>
  </e-heatmap-palettesettings>
  <e-heatmap-cellsettings tileType="Bubble" bubbleType="SizeAndColor"></e-heatmap-cellsettings>
  <e-heatmap-legendsettings visible="true"></e-heatmap-legendsettings>
  <e-heatmap-datasourcesettings isJsonData="true" adaptorType="Table"
    xDataMapping="Year"></e-heatmap-datasourcesettings>
</ejs-heatmap>

<script>
  var dataSource = [
    { 'Year': '2017', 'Jan-Feb': [4, 39], 'Mar-Apr': [3, 8], 'May-Jun': [1, 3], 'Jul-Aug': [1, 10], 'Sep-Oct': [4, 4], 'Nov-Dec': [2, 15] },
    { 'Year': '2016', 'Jan-Feb': [4, 28], 'Mar-Apr': [5, 92], 'May-Jun': [5, 73], 'Jul-Aug': [3, 1], 'Sep-Oct': [3, 4], 'Nov-Dec': [4, 126] },
    { 'Year': '2015', 'Jan-Feb': [4, 45], 'Mar-Apr': [5, 152], 'May-Jun': [0, 44], 'Jul-Aug': [4, 54], 'Sep-Oct': [5, 243], 'Nov-Dec': [2, 45] },
  ];
  window.onHeatmapLoad = function (args) {
    args.heatmap.dataSource = dataSource;
  }
  window.ontooltipRender = function (args) {
    args.content = ['Year ' + ' : ' + args.xLabel + '<br/>' + 'Months ' + ' : ' + args.yLabel + '<br/>'
      + 'Accidents ' + ' : ' + args.value[0].bubbleData + '<br/>' + 'Fatalities ' + ' : '
      + args.value[1].bubbleData];
  }
</script>
public ActionResult Gradient()
{
            ViewBag.textStyle = new
            {
                size = "15px",
                fontWeight = "500",
                fontStyle = "Normal",
                fontFamily = "Segoe UI"
            };
            ViewBag.border = new
            {
                color = "red",
                opacity = 1
            };
            string[] xlabels = new string[3] { "2017", "2016", "2015" };
            ViewBag.xLabels = xlabels;
            string[] yLabels = new string[6] { "Jan-Feb", "Mar-Apr", "May-Jun", "Jul-Aug", "Sep-Oct", "Nov-Dec" };
            ViewBag.yLabels = yLabels;
            return View();
}

Bubble HeatMap with size and color combined and rendered with JSON data and table adaptor type

Cell

The following example illustrates how to render a bubble HeatMap with different sizes and colors using JSON cell binding.

<ejs-heatmap id='container' load="window.onHeatmapLoad" tooltipRender="window.ontooltipRender" showTooltip="true">
  <e-heatmap-titlesettings text="Commercial Aviation Accidents and Fatalities by year 2012 - 2017"
    textStyle="ViewBag.textStyle">
  </e-heatmap-titlesettings>
  <e-heatmap-xaxis labels="ViewBag.xLabels">
  </e-heatmap-xaxis>
  <e-heatmap-yaxis labels="ViewBag.yLabels">
  </e-heatmap-yaxis>
  <e-heatmap-palettesettings type="Gradient">
    <e-palettes>
      <e-palette color="#C06C84"></e-palette>
      <e-palette color="#6C5B7B"></e-palette>
      <e-palette color="#355C7D"></e-palette>
    </e-palettes>
  </e-heatmap-palettesettings>
  <e-heatmap-cellsettings tileType="Bubble" bubbleType="SizeAndColor"></e-heatmap-cellsettings>
  <e-heatmap-legendsettings visible="true"></e-heatmap-legendsettings>
  <e-heatmap-datasourcesettings isJsonData="true" adaptorType="Cell" xDataMapping="Year" yDataMapping="Months">
    <e-data-bubbledatamapping size="Accidents" color="Fatalities"></e-data-bubbledatamapping>
  </e-heatmap-datasourcesettings>
</ejs-heatmap>

<script>
  var dataSource = [
    { Year: '2017', Months: 'Jan-Feb', Accidents: 4, Fatalities: 39 },
    { Year: '2017', Months: 'Mar-Apr', Accidents: 3, Fatalities: 8 },
    { Year: '2017', Months: 'May-Jun', Accidents: 1, Fatalities: 3 },
    { Year: '2017', Months: 'Jul-Aug', Accidents: 1, Fatalities: 10 },
    { Year: '2017', Months: 'Sep-Oct', Accidents: 4, Fatalities: 4 },
    { Year: '2017', Months: 'Nov-Dec', Accidents: 2, Fatalities: 15 },
    { Year: '2016', Months: 'Jan-Feb', Accidents: 4, Fatalities: 28 },
    { Year: '2016', Months: 'Mar-Apr', Accidents: 5, Fatalities: 92 },
    { Year: '2016', Months: 'May-Jun', Accidents: 5, Fatalities: 73 },
    { Year: '2016', Months: 'Jul-Aug', Accidents: 3, Fatalities: 1 },
    { Year: '2016', Months: 'Sep-Oct', Accidents: 3, Fatalities: 4 },
    { Year: '2016', Months: 'Nov-Dec', Accidents: 4, Fatalities: 126 },
    { Year: '2015', Months: 'Jan-Feb', Accidents: 4, Fatalities: 45 },
    { Year: '2015', Months: 'Mar-Apr', Accidents: 5, Fatalities: 152 },
    { Year: '2015', Months: 'May-Jun', Accidents: 0, Fatalities: 0 },
    { Year: '2015', Months: 'Jul-Aug', Accidents: 4, Fatalities: 54 },
    { Year: '2015', Months: 'Sep-Oct', Accidents: 5, Fatalities: 243 },
    { Year: '2015', Months: 'Nov-Dec', Accidents: 2, Fatalities: 45 },
  ];
  window.onHeatmapLoad = function (args) {
    args.heatmap.dataSource = dataSource;
  }
  window.ontooltipRender = function (args) {
    args.content = ['Year ' + ' : ' + args.xLabel + '<br/>' + 'Months ' + ' : ' + args.yLabel + '<br/>'
      + 'Accidents ' + ' : ' + args.value[0].bubbleData + '<br/>' + 'Fatalities ' + ' : '
      + args.value[1].bubbleData];
  }
</script>
public ActionResult Gradient()
{
            ViewBag.textStyle = new
            {
                size = "15px",
                fontWeight = "500",
                fontStyle = "Normal",
                fontFamily = "Segoe UI"
            };
            ViewBag.border = new
            {
                color = "red",
                opacity = 1
            };
            string[] xlabels = new string[3] { "2017", "2016", "2015" };
            ViewBag.xLabels = xlabels;
            string[] yLabels = new string[6] { "Jan-Feb", "Mar-Apr", "May-Jun", "Jul-Aug", "Sep-Oct", "Nov-Dec" };
            ViewBag.yLabels = yLabels;
            return View();
}

Bubble HeatMap with size and color combined and rendered with JSON data and cell adaptor type

Binding size and color values from datasource

The size and color of the bubbles in the SizeAndColor bubble HeatMap type can be customized by binding the datasource field name that holds the size and color values to the size and color properties in the bubbleDataMapping.

The bubbleDataMapping supports only for the JSON data with cell adaptor type.

<ejs-heatmap id='container' load="window.onHeatmapLoad" tooltipRender="window.ontooltipRender" showTooltip="true">
  <e-heatmap-titlesettings text="Commercial Aviation Accidents and Fatalities by year 2012 - 2017"
    textStyle="ViewBag.textStyle">
  </e-heatmap-titlesettings>
  <e-heatmap-xaxis labels="ViewBag.xLabels">
  </e-heatmap-xaxis>
  <e-heatmap-yaxis labels="ViewBag.yLabels">
  </e-heatmap-yaxis>
  <e-heatmap-palettesettings type="Gradient">
    <e-palettes>
      <e-palette color="#C06C84"></e-palette>
      <e-palette color="#6C5B7B"></e-palette>
      <e-palette color="#355C7D"></e-palette>
    </e-palettes>
  </e-heatmap-palettesettings>
  <e-heatmap-cellsettings tileType="Bubble" bubbleType="SizeAndColor"></e-heatmap-cellsettings>
  <e-heatmap-legendsettings visible="true"></e-heatmap-legendsettings>
  <e-heatmap-datasourcesettings isJsonData="true" adaptorType="Cell" xDataMapping="Year" yDataMapping="Months">
    <e-data-bubbledatamapping size="Accidents" color="Fatalities"></e-data-bubbledatamapping>
  </e-heatmap-datasourcesettings>
</ejs-heatmap>

<script>
  var dataSource = [
    { Year: '2017', Months: 'Jan-Feb', Accidents: 4, Fatalities: 39 },
    { Year: '2017', Months: 'Mar-Apr', Accidents: 3, Fatalities: 8 },
    { Year: '2017', Months: 'May-Jun', Accidents: 1, Fatalities: 3 },
    { Year: '2017', Months: 'Jul-Aug', Accidents: 1, Fatalities: 10 },
    { Year: '2017', Months: 'Sep-Oct', Accidents: 4, Fatalities: 4 },
    { Year: '2017', Months: 'Nov-Dec', Accidents: 2, Fatalities: 15 },
    { Year: '2016', Months: 'Jan-Feb', Accidents: 4, Fatalities: 28 },
    { Year: '2016', Months: 'Mar-Apr', Accidents: 5, Fatalities: 92 },
    { Year: '2016', Months: 'May-Jun', Accidents: 5, Fatalities: 73 },
    { Year: '2016', Months: 'Jul-Aug', Accidents: 3, Fatalities: 1 },
    { Year: '2016', Months: 'Sep-Oct', Accidents: 3, Fatalities: 4 },
    { Year: '2016', Months: 'Nov-Dec', Accidents: 4, Fatalities: 126 },
    { Year: '2015', Months: 'Jan-Feb', Accidents: 4, Fatalities: 45 },
    { Year: '2015', Months: 'Mar-Apr', Accidents: 5, Fatalities: 152 },
    { Year: '2015', Months: 'May-Jun', Accidents: 0, Fatalities: 0 },
    { Year: '2015', Months: 'Jul-Aug', Accidents: 4, Fatalities: 54 },
    { Year: '2015', Months: 'Sep-Oct', Accidents: 5, Fatalities: 243 },
    { Year: '2015', Months: 'Nov-Dec', Accidents: 2, Fatalities: 45 },
  ];
  window.onHeatmapLoad = function (args) {
    args.heatmap.dataSource = dataSource;
  }
  window.ontooltipRender = function (args) {
    args.content = ['Year ' + ' : ' + args.xLabel + '<br/>' + 'Months ' + ' : ' + args.yLabel + '<br/>'
      + 'Accidents ' + ' : ' + args.value[0].bubbleData + '<br/>' + 'Fatalities ' + ' : '
      + args.value[1].bubbleData];
  }
</script>
public ActionResult Gradient()
{
            ViewBag.textStyle = new
            {
                size = "15px",
                fontWeight = "500",
                fontStyle = "Normal",
                fontFamily = "Segoe UI"
            };
            ViewBag.border = new
            {
                color = "red",
                opacity = 1
            };
            string[] xlabels = new string[3] { "2017", "2016", "2015" };
            ViewBag.xLabels = xlabels;
            string[] yLabels = new string[6] { "Jan-Feb", "Mar-Apr", "May-Jun", "Jul-Aug", "Sep-Oct", "Nov-Dec" };
            ViewBag.yLabels = yLabels;
            return View();
}

Bubble HeatMap with size and color type and bubble attributes