ChartDirector 6.2 (.NET Edition)

Bubble Chart




This example demonstrates how to create a bubble chart.

In ChartDirector, a bubble chart can be created as a scatter layer with circles as symbols using XYChart.addScatterLayer. The sizes of the symbols are then controlled by another data series (z data) using LineLayer.setSymbolScale. This creates circles of different sizes.

By default, ChartDirector handles z data using pixel units. That means a z value of 50 will result in a symbol size of 50 pixels. If your z data are too small or too large, you may re-scale them using ArrayMath.mul before passing them to LineLayer.setSymbolScale.

ChartDirector also supports handling the z data using the same scale as the y (or x) axis by supplying additional arguments to LineLayer.setSymbolScale. This is useful if the symbol sizes reflect some features of the y (or x) data, such as the standard deviation or confidence of the y (or x) value.

Source Code Listing

[Windows Forms - C# version] NetWinCharts\CSharpWinCharts\bubble.cs
using System;
using ChartDirector;

namespace CSharpChartExplorer
{
    public class bubble : DemoModule
    {
        //Name of demo module
        public string getName() { return "Bubble Chart"; }

        //Number of charts produced in this demo module
        public int getNoOfCharts() { return 1; }

        //Main code for creating chart.
        //Note: the argument chartIndex is unused because this demo only has 1 chart.
        public void createChart(WinChartViewer viewer, int chartIndex)
        {
            // The XYZ points for the bubble chart
            double[] dataX0 = {150, 300, 1000, 1700};
            double[] dataY0 = {12, 60, 25, 65};
            double[] dataZ0 = {20, 50, 50, 85};

            double[] dataX1 = {500, 1000, 1300};
            double[] dataY1 = {35, 50, 75};
            double[] dataZ1 = {30, 55, 95};

            // Create a XYChart object of size 450 x 420 pixels
            XYChart c = new XYChart(450, 420);

            // Set the plotarea at (55, 65) and of size 350 x 300 pixels, with a light grey border
            // (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
            // (0xc0c0c0)
            c.setPlotArea(55, 65, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1);

            // Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12pt
            // Times Bold Italic font. Set the background and border color to Transparent.
            c.addLegend(50, 30, false, "Times New Roman Bold Italic", 12).setBackground(
                Chart.Transparent);

            // Add a title to the chart using 18pt Times Bold Itatic font.
            c.addTitle("Product Comparison Chart", "Times New Roman Bold Italic", 18);

            // Add a title to the y axis using 12pt Arial Bold Italic font
            c.yAxis().setTitle("Capacity (tons)", "Arial Bold Italic", 12);

            // Add a title to the x axis using 12pt Arial Bold Italic font
            c.xAxis().setTitle("Range (miles)", "Arial Bold Italic", 12);

            // Set the axes line width to 3 pixels
            c.xAxis().setWidth(3);
            c.yAxis().setWidth(3);

            // Add (dataX0, dataY0) as a scatter layer with semi-transparent red (0x80ff3333) circle
            // symbols, where the circle size is modulated by dataZ0. This creates a bubble effect.
            c.addScatterLayer(dataX0, dataY0, "Technology AAA", Chart.CircleSymbol, 9,
                unchecked((int)0x80ff3333), unchecked((int)0x80ff3333)).setSymbolScale(dataZ0);

            // Add (dataX1, dataY1) as a scatter layer with semi-transparent green (0x803333ff)
            // circle symbols, where the circle size is modulated by dataZ1. This creates a bubble
            // effect.
            c.addScatterLayer(dataX1, dataY1, "Technology BBB", Chart.CircleSymbol, 9,
                unchecked((int)0x803333ff), unchecked((int)0x803333ff)).setSymbolScale(dataZ1);

            // Output the chart
            viewer.Chart = c;

            //include tool tip for the chart
            viewer.ImageMap = c.getHTMLImageMap("clickable", "",
                "title='[{dataSetName}] Range = {x} miles, Capacity = {value} tons, Length = {z} " +
                "meters'");
        }
    }
}

[Windows Forms - VB Version] NetWinCharts\VBNetWinCharts\bubble.vb
Imports System
Imports Microsoft.VisualBasic
Imports ChartDirector

Public Class bubble
    Implements DemoModule

    'Name of demo module
    Public Function getName() As String Implements DemoModule.getName
        Return "Bubble Chart"
    End Function

    'Number of charts produced in this demo module
    Public Function getNoOfCharts() As Integer Implements DemoModule.getNoOfCharts
        Return 1
    End Function

    'Main code for creating chart.
    'Note: the argument chartIndex is unused because this demo only has 1 chart.
    Public Sub createChart(viewer As WinChartViewer, chartIndex As Integer) _
        Implements DemoModule.createChart

        ' The XYZ points for the bubble chart
        Dim dataX0() As Double = {150, 300, 1000, 1700}
        Dim dataY0() As Double = {12, 60, 25, 65}
        Dim dataZ0() As Double = {20, 50, 50, 85}

        Dim dataX1() As Double = {500, 1000, 1300}
        Dim dataY1() As Double = {35, 50, 75}
        Dim dataZ1() As Double = {30, 55, 95}

        ' Create a XYChart object of size 450 x 420 pixels
        Dim c As XYChart = New XYChart(450, 420)

        ' Set the plotarea at (55, 65) and of size 350 x 300 pixels, with a light grey border
        ' (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
        ' (0xc0c0c0)
        c.setPlotArea(55, 65, 350, 300, -1, -1, &Hc0c0c0, &Hc0c0c0, -1)

        ' Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12pt Times
        ' Bold Italic font. Set the background and border color to Transparent.
        c.addLegend(50, 30, False, "Times New Roman Bold Italic", 12).setBackground( _
            Chart.Transparent)

        ' Add a title to the chart using 18pt Times Bold Itatic font.
        c.addTitle("Product Comparison Chart", "Times New Roman Bold Italic", 18)

        ' Add a title to the y axis using 12pt Arial Bold Italic font
        c.yAxis().setTitle("Capacity (tons)", "Arial Bold Italic", 12)

        ' Add a title to the x axis using 12pt Arial Bold Italic font
        c.xAxis().setTitle("Range (miles)", "Arial Bold Italic", 12)

        ' Set the axes line width to 3 pixels
        c.xAxis().setWidth(3)
        c.yAxis().setWidth(3)

        ' Add (dataX0, dataY0) as a scatter layer with semi-transparent red (0x80ff3333) circle
        ' symbols, where the circle size is modulated by dataZ0. This creates a bubble effect.
        c.addScatterLayer(dataX0, dataY0, "Technology AAA", Chart.CircleSymbol, 9, &H80ff3333, _
            &H80ff3333).setSymbolScale(dataZ0)

        ' Add (dataX1, dataY1) as a scatter layer with semi-transparent green (0x803333ff) circle
        ' symbols, where the circle size is modulated by dataZ1. This creates a bubble effect.
        c.addScatterLayer(dataX1, dataY1, "Technology BBB", Chart.CircleSymbol, 9, &H803333ff, _
            &H803333ff).setSymbolScale(dataZ1)

        ' Output the chart
        viewer.Chart = c

        'include tool tip for the chart
        viewer.ImageMap = c.getHTMLImageMap("clickable", "", _
            "title='[{dataSetName}] Range = {x} miles, Capacity = {value} tons, Length = {z} " & _
            "meters'")

    End Sub

End Class

[WPF - C#] NetWPFCharts\bubble.cs
using System;
using ChartDirector;

namespace CSharpWPFDemo
{
    public class bubble : DemoModule
    {
        //Name of demo module
        public string getName() { return "Bubble Chart"; }

        //Number of charts produced in this demo module
        public int getNoOfCharts() { return 1; }

        //Main code for creating chart.
        //Note: the argument chartIndex is unused because this demo only has 1 chart.
        public void createChart(WPFChartViewer viewer, int chartIndex)
        {
            // The XYZ points for the bubble chart
            double[] dataX0 = {150, 300, 1000, 1700};
            double[] dataY0 = {12, 60, 25, 65};
            double[] dataZ0 = {20, 50, 50, 85};

            double[] dataX1 = {500, 1000, 1300};
            double[] dataY1 = {35, 50, 75};
            double[] dataZ1 = {30, 55, 95};

            // Create a XYChart object of size 450 x 420 pixels
            XYChart c = new XYChart(450, 420);

            // Set the plotarea at (55, 65) and of size 350 x 300 pixels, with a light grey border
            // (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
            // (0xc0c0c0)
            c.setPlotArea(55, 65, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1);

            // Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12pt
            // Times Bold Italic font. Set the background and border color to Transparent.
            c.addLegend(50, 30, false, "Times New Roman Bold Italic", 12).setBackground(
                Chart.Transparent);

            // Add a title to the chart using 18pt Times Bold Itatic font.
            c.addTitle("Product Comparison Chart", "Times New Roman Bold Italic", 18);

            // Add a title to the y axis using 12pt Arial Bold Italic font
            c.yAxis().setTitle("Capacity (tons)", "Arial Bold Italic", 12);

            // Add a title to the x axis using 12pt Arial Bold Italic font
            c.xAxis().setTitle("Range (miles)", "Arial Bold Italic", 12);

            // Set the axes line width to 3 pixels
            c.xAxis().setWidth(3);
            c.yAxis().setWidth(3);

            // Add (dataX0, dataY0) as a scatter layer with semi-transparent red (0x80ff3333) circle
            // symbols, where the circle size is modulated by dataZ0. This creates a bubble effect.
            c.addScatterLayer(dataX0, dataY0, "Technology AAA", Chart.CircleSymbol, 9,
                unchecked((int)0x80ff3333), unchecked((int)0x80ff3333)).setSymbolScale(dataZ0);

            // Add (dataX1, dataY1) as a scatter layer with semi-transparent green (0x803333ff)
            // circle symbols, where the circle size is modulated by dataZ1. This creates a bubble
            // effect.
            c.addScatterLayer(dataX1, dataY1, "Technology BBB", Chart.CircleSymbol, 9,
                unchecked((int)0x803333ff), unchecked((int)0x803333ff)).setSymbolScale(dataZ1);

            // Output the chart
            viewer.Chart = c;

            //include tool tip for the chart
            viewer.ImageMap = c.getHTMLImageMap("clickable", "",
                "title='[{dataSetName}] Range = {x} miles, Capacity = {value} tons, Length = {z} " +
                "meters'");
        }
    }
}

[ASP.NET Web Forms - C# version] NetWebCharts\CSharpASP\bubble.aspx
(Click here on how to convert this code to code-behind style.)
<%@ Page Language="C#" Debug="true" %>
<%@ Import Namespace="ChartDirector" %>
<%@ Register TagPrefix="chart" Namespace="ChartDirector" Assembly="netchartdir" %>

<!DOCTYPE html>

<script runat="server">

//
// Page Load event handler
//
protected void Page_Load(object sender, EventArgs e)
{
    // The XYZ points for the bubble chart
    double[] dataX0 = {150, 300, 1000, 1700};
    double[] dataY0 = {12, 60, 25, 65};
    double[] dataZ0 = {20, 50, 50, 85};

    double[] dataX1 = {500, 1000, 1300};
    double[] dataY1 = {35, 50, 75};
    double[] dataZ1 = {30, 55, 95};

    // Create a XYChart object of size 450 x 420 pixels
    XYChart c = new XYChart(450, 420);

    // Set the plotarea at (55, 65) and of size 350 x 300 pixels, with a light grey border
    // (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color (0xc0c0c0)
    c.setPlotArea(55, 65, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1);

    // Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12pt Times Bold
    // Italic font. Set the background and border color to Transparent.
    c.addLegend(50, 30, false, "Times New Roman Bold Italic", 12).setBackground(Chart.Transparent);

    // Add a title to the chart using 18pt Times Bold Itatic font.
    c.addTitle("Product Comparison Chart", "Times New Roman Bold Italic", 18);

    // Add a title to the y axis using 12pt Arial Bold Italic font
    c.yAxis().setTitle("Capacity (tons)", "Arial Bold Italic", 12);

    // Add a title to the x axis using 12pt Arial Bold Italic font
    c.xAxis().setTitle("Range (miles)", "Arial Bold Italic", 12);

    // Set the axes line width to 3 pixels
    c.xAxis().setWidth(3);
    c.yAxis().setWidth(3);

    // Add (dataX0, dataY0) as a scatter layer with semi-transparent red (0x80ff3333) circle
    // symbols, where the circle size is modulated by dataZ0. This creates a bubble effect.
    c.addScatterLayer(dataX0, dataY0, "Technology AAA", Chart.CircleSymbol, 9,
        unchecked((int)0x80ff3333), unchecked((int)0x80ff3333)).setSymbolScale(dataZ0);

    // Add (dataX1, dataY1) as a scatter layer with semi-transparent green (0x803333ff) circle
    // symbols, where the circle size is modulated by dataZ1. This creates a bubble effect.
    c.addScatterLayer(dataX1, dataY1, "Technology BBB", Chart.CircleSymbol, 9,
        unchecked((int)0x803333ff), unchecked((int)0x803333ff)).setSymbolScale(dataZ1);

    // Output the chart
    WebChartViewer1.Image = c.makeWebImage(Chart.PNG);

    // Include tool tip for the chart
    WebChartViewer1.ImageMap = c.getHTMLImageMap("", "",
        "title='[{dataSetName}] Range = {x} miles, Capacity = {value} tons, Length = {z} meters'");
}

</script>

<html>
<body>
    <chart:WebChartViewer id="WebChartViewer1" runat="server" />
</body>
</html>

[ASP.NET Web Forms - VB Version] NetWebCharts\VBNetASP\bubble.aspx
(Click here on how to convert this code to code-behind style.)
<%@ Page Language="VB" Debug="true" %>
<%@ Import Namespace="ChartDirector" %>
<%@ Register TagPrefix="chart" Namespace="ChartDirector" Assembly="netchartdir" %>

<!DOCTYPE html>

<script runat="server">

'
' Page Load event handler
'
Protected Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)

    ' The XYZ points for the bubble chart
    Dim dataX0() As Double = {150, 300, 1000, 1700}
    Dim dataY0() As Double = {12, 60, 25, 65}
    Dim dataZ0() As Double = {20, 50, 50, 85}

    Dim dataX1() As Double = {500, 1000, 1300}
    Dim dataY1() As Double = {35, 50, 75}
    Dim dataZ1() As Double = {30, 55, 95}

    ' Create a XYChart object of size 450 x 420 pixels
    Dim c As XYChart = New XYChart(450, 420)

    ' Set the plotarea at (55, 65) and of size 350 x 300 pixels, with a light grey border
    ' (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color (0xc0c0c0)
    c.setPlotArea(55, 65, 350, 300, -1, -1, &Hc0c0c0, &Hc0c0c0, -1)

    ' Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12pt Times Bold
    ' Italic font. Set the background and border color to Transparent.
    c.addLegend(50, 30, False, "Times New Roman Bold Italic", 12).setBackground(Chart.Transparent)

    ' Add a title to the chart using 18pt Times Bold Itatic font.
    c.addTitle("Product Comparison Chart", "Times New Roman Bold Italic", 18)

    ' Add a title to the y axis using 12pt Arial Bold Italic font
    c.yAxis().setTitle("Capacity (tons)", "Arial Bold Italic", 12)

    ' Add a title to the x axis using 12pt Arial Bold Italic font
    c.xAxis().setTitle("Range (miles)", "Arial Bold Italic", 12)

    ' Set the axes line width to 3 pixels
    c.xAxis().setWidth(3)
    c.yAxis().setWidth(3)

    ' Add (dataX0, dataY0) as a scatter layer with semi-transparent red (0x80ff3333) circle symbols,
    ' where the circle size is modulated by dataZ0. This creates a bubble effect.
    c.addScatterLayer(dataX0, dataY0, "Technology AAA", Chart.CircleSymbol, 9, &H80ff3333, _
        &H80ff3333).setSymbolScale(dataZ0)

    ' Add (dataX1, dataY1) as a scatter layer with semi-transparent green (0x803333ff) circle
    ' symbols, where the circle size is modulated by dataZ1. This creates a bubble effect.
    c.addScatterLayer(dataX1, dataY1, "Technology BBB", Chart.CircleSymbol, 9, &H803333ff, _
        &H803333ff).setSymbolScale(dataZ1)

    ' Output the chart
    WebChartViewer1.Image = c.makeWebImage(Chart.PNG)

    ' Include tool tip for the chart
    WebChartViewer1.ImageMap = c.getHTMLImageMap("", "", _
        "title='[{dataSetName}] Range = {x} miles, Capacity = {value} tons, Length = {z} meters'")

End Sub

</script>

<html>
<body>
    <chart:WebChartViewer id="WebChartViewer1" runat="server" />
</body>
</html>

[ASP.NET MVC - Controller] NetMvcCharts\Controllers\BubbleController.cs
using System;
using System.Web.Mvc;
using ChartDirector;

namespace NetMvcCharts.Controllers
{
    public class BubbleController : Controller
    {
        //
        // Default Action
        //
        public ActionResult Index()
        {
            ViewBag.Title = "Bubble Chart";
            createChart(ViewBag.Viewer = new RazorChartViewer(HttpContext, "chart1"));
            return View("~/Views/Shared/ChartView.cshtml");
        }

        //
        // Create chart
        //
        private void createChart(RazorChartViewer viewer)
        {
            // The XYZ points for the bubble chart
            double[] dataX0 = {150, 300, 1000, 1700};
            double[] dataY0 = {12, 60, 25, 65};
            double[] dataZ0 = {20, 50, 50, 85};

            double[] dataX1 = {500, 1000, 1300};
            double[] dataY1 = {35, 50, 75};
            double[] dataZ1 = {30, 55, 95};

            // Create a XYChart object of size 450 x 420 pixels
            XYChart c = new XYChart(450, 420);

            // Set the plotarea at (55, 65) and of size 350 x 300 pixels, with a light grey border
            // (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
            // (0xc0c0c0)
            c.setPlotArea(55, 65, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1);

            // Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12pt Times
            // Bold Italic font. Set the background and border color to Transparent.
            c.addLegend(50, 30, false, "Times New Roman Bold Italic", 12).setBackground(Chart.Transparent
                );

            // Add a title to the chart using 18pt Times Bold Itatic font.
            c.addTitle("Product Comparison Chart", "Times New Roman Bold Italic", 18);

            // Add a title to the y axis using 12pt Arial Bold Italic font
            c.yAxis().setTitle("Capacity (tons)", "Arial Bold Italic", 12);

            // Add a title to the x axis using 12pt Arial Bold Italic font
            c.xAxis().setTitle("Range (miles)", "Arial Bold Italic", 12);

            // Set the axes line width to 3 pixels
            c.xAxis().setWidth(3);
            c.yAxis().setWidth(3);

            // Add (dataX0, dataY0) as a scatter layer with semi-transparent red (0x80ff3333) circle
            // symbols, where the circle size is modulated by dataZ0. This creates a bubble effect.
            c.addScatterLayer(dataX0, dataY0, "Technology AAA", Chart.CircleSymbol, 9,
                unchecked((int)0x80ff3333), unchecked((int)0x80ff3333)).setSymbolScale(dataZ0);

            // Add (dataX1, dataY1) as a scatter layer with semi-transparent green (0x803333ff) circle
            // symbols, where the circle size is modulated by dataZ1. This creates a bubble effect.
            c.addScatterLayer(dataX1, dataY1, "Technology BBB", Chart.CircleSymbol, 9,
                unchecked((int)0x803333ff), unchecked((int)0x803333ff)).setSymbolScale(dataZ1);

            // Output the chart
            viewer.Image = c.makeWebImage(Chart.PNG);

            // Include tool tip for the chart
            viewer.ImageMap = c.getHTMLImageMap("", "",
                "title='[{dataSetName}] Range = {x} miles, Capacity = {value} tons, Length = {z} meters'"
                );
        }
    }
}

[ASP.NET MVC - View] NetMvcCharts\Views\Shared\ChartView.cshtml
@{ Layout = null; }

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>@ViewBag.Title</title>
</head>
<body style="margin:5px 0px 0px 5px">
    <div style="font:bold 18pt verdana;">
        @ViewBag.Title
    </div>
    <hr style="border:solid 1px #000080" />
    <div>
        @{
            if (ViewBag.Viewer is Array)
            {
                // Display multiple charts
                for (int i = 0; i < ViewBag.Viewer.Length; ++i)
                {
                    @:@Html.Raw(ViewBag.Viewer[i].RenderHTML())
                }
            }
            else
            {
                // Display one chart only
                @:@Html.Raw(ViewBag.Viewer.RenderHTML())
            }
        }
    </div>
</body>
</html>