ChartDirector 6.2 (.NET Edition)

Polar Bubble Chart




This example demonstrates how to create polar bubble charts. It also demonstrates using alternating background colors along the radial direction.

A polar bubble chart can be created as a polar line chart with circles as data symbols. The line width is set to 0, so only the symbols can be seen. The symbol sizes are then controlled using another data series. This will create the effects of a bubble chart.

The detail steps are:

Note that in this example, the polar plot area uses two alternating background colors along the radial direction. This is by using PolarChart.setPlotAreaBg.

Source Code Listing

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

namespace CSharpChartExplorer
{
    public class polarbubble : DemoModule
    {
        //Name of demo module
        public string getName() { return "Polar 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 data for the chart
            double[] data0 = {6, 12.5, 18.2, 15};
            double[] angles0 = {45, 96, 169, 258};
            double[] size0 = {41, 105, 12, 20};

            double[] data1 = {18, 16, 11, 14};
            double[] angles1 = {30, 210, 240, 310};
            double[] size1 = {30, 45, 12, 90};

            // Create a PolarChart object of size 460 x 460 pixels
            PolarChart c = new PolarChart(460, 460);

            // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
            c.addTitle2(Chart.TopLeft, "<*underline=2*>EM Field Strength", "Arial Bold Italic", 15);

            // Set center of plot area at (230, 240) with radius 180 pixels
            c.setPlotArea(230, 240, 180);

            // Use alternative light grey/dark grey circular background color
            c.setPlotAreaBg(0xdddddd, 0xeeeeee);

            // Set the grid style to circular grid
            c.setGridStyle(false);

            // Add a legend box at the top right corner of the chart using 9pt Arial Bold font
            c.addLegend(459, 0, true, "Arial Bold", 9).setAlignment(Chart.TopRight);

            // Set angular axis as 0 - 360, with a spoke every 30 units
            c.angularAxis().setLinearScale(0, 360, 30);

            // Set the radial axis label format
            c.radialAxis().setLabelFormat("{value} km");

            // Add a blue (0x9999ff) line layer to the chart using (data0, angle0)
            PolarLineLayer layer0 = c.addLineLayer(data0, 0x9999ff, "Cold Spot");
            layer0.setAngles(angles0);

            // Disable the line by setting its width to 0, so only the symbols are visible
            layer0.setLineWidth(0);

            // Use a circular data point symbol
            layer0.setDataSymbol(Chart.CircleSymbol, 11);

            // Modulate the symbol size by size0 to produce a bubble chart effect
            layer0.setSymbolScale(size0);

            // Add a red (0xff9999) line layer to the chart using (data1, angle1)
            PolarLineLayer layer1 = c.addLineLayer(data1, 0xff9999, "Hot Spot");
            layer1.setAngles(angles1);

            // Disable the line by setting its width to 0, so only the symbols are visible
            layer1.setLineWidth(0);

            // Use a circular data point symbol
            layer1.setDataSymbol(Chart.CircleSymbol, 11);

            // Modulate the symbol size by size1 to produce a bubble chart effect
            layer1.setSymbolScale(size1);

            // Output the chart
            viewer.Chart = c;

            //include tool tip for the chart
            viewer.ImageMap = c.getHTMLImageMap("clickable", "",
                "title='{dataSetName} at ({value} km, {angle} deg)\nStrength = {z} Watt'");
        }
    }
}

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

Public Class polarbubble
    Implements DemoModule

    'Name of demo module
    Public Function getName() As String Implements DemoModule.getName
        Return "Polar 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 data for the chart
        Dim data0() As Double = {6, 12.5, 18.2, 15}
        Dim angles0() As Double = {45, 96, 169, 258}
        Dim size0() As Double = {41, 105, 12, 20}

        Dim data1() As Double = {18, 16, 11, 14}
        Dim angles1() As Double = {30, 210, 240, 310}
        Dim size1() As Double = {30, 45, 12, 90}

        ' Create a PolarChart object of size 460 x 460 pixels
        Dim c As PolarChart = New PolarChart(460, 460)

        ' Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
        c.addTitle2(Chart.TopLeft, "<*underline=2*>EM Field Strength", "Arial Bold Italic", 15)

        ' Set center of plot area at (230, 240) with radius 180 pixels
        c.setPlotArea(230, 240, 180)

        ' Use alternative light grey/dark grey circular background color
        c.setPlotAreaBg(&Hdddddd, &Heeeeee)

        ' Set the grid style to circular grid
        c.setGridStyle(False)

        ' Add a legend box at the top right corner of the chart using 9pt Arial Bold font
        c.addLegend(459, 0, True, "Arial Bold", 9).setAlignment(Chart.TopRight)

        ' Set angular axis as 0 - 360, with a spoke every 30 units
        c.angularAxis().setLinearScale(0, 360, 30)

        ' Set the radial axis label format
        c.radialAxis().setLabelFormat("{value} km")

        ' Add a blue (0x9999ff) line layer to the chart using (data0, angle0)
        Dim layer0 As PolarLineLayer = c.addLineLayer(data0, &H9999ff, "Cold Spot")
        layer0.setAngles(angles0)

        ' Disable the line by setting its width to 0, so only the symbols are visible
        layer0.setLineWidth(0)

        ' Use a circular data point symbol
        layer0.setDataSymbol(Chart.CircleSymbol, 11)

        ' Modulate the symbol size by size0 to produce a bubble chart effect
        layer0.setSymbolScale(size0)

        ' Add a red (0xff9999) line layer to the chart using (data1, angle1)
        Dim layer1 As PolarLineLayer = c.addLineLayer(data1, &Hff9999, "Hot Spot")
        layer1.setAngles(angles1)

        ' Disable the line by setting its width to 0, so only the symbols are visible
        layer1.setLineWidth(0)

        ' Use a circular data point symbol
        layer1.setDataSymbol(Chart.CircleSymbol, 11)

        ' Modulate the symbol size by size1 to produce a bubble chart effect
        layer1.setSymbolScale(size1)

        ' Output the chart
        viewer.Chart = c

        'include tool tip for the chart
        viewer.ImageMap = c.getHTMLImageMap("clickable", "", _
            "title='{dataSetName} at ({value} km, {angle} deg)" & vbLf & "Strength = {z} Watt'")

    End Sub

End Class

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

namespace CSharpWPFDemo
{
    public class polarbubble : DemoModule
    {
        //Name of demo module
        public string getName() { return "Polar 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 data for the chart
            double[] data0 = {6, 12.5, 18.2, 15};
            double[] angles0 = {45, 96, 169, 258};
            double[] size0 = {41, 105, 12, 20};

            double[] data1 = {18, 16, 11, 14};
            double[] angles1 = {30, 210, 240, 310};
            double[] size1 = {30, 45, 12, 90};

            // Create a PolarChart object of size 460 x 460 pixels
            PolarChart c = new PolarChart(460, 460);

            // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
            c.addTitle2(Chart.TopLeft, "<*underline=2*>EM Field Strength", "Arial Bold Italic", 15);

            // Set center of plot area at (230, 240) with radius 180 pixels
            c.setPlotArea(230, 240, 180);

            // Use alternative light grey/dark grey circular background color
            c.setPlotAreaBg(0xdddddd, 0xeeeeee);

            // Set the grid style to circular grid
            c.setGridStyle(false);

            // Add a legend box at the top right corner of the chart using 9pt Arial Bold font
            c.addLegend(459, 0, true, "Arial Bold", 9).setAlignment(Chart.TopRight);

            // Set angular axis as 0 - 360, with a spoke every 30 units
            c.angularAxis().setLinearScale(0, 360, 30);

            // Set the radial axis label format
            c.radialAxis().setLabelFormat("{value} km");

            // Add a blue (0x9999ff) line layer to the chart using (data0, angle0)
            PolarLineLayer layer0 = c.addLineLayer(data0, 0x9999ff, "Cold Spot");
            layer0.setAngles(angles0);

            // Disable the line by setting its width to 0, so only the symbols are visible
            layer0.setLineWidth(0);

            // Use a circular data point symbol
            layer0.setDataSymbol(Chart.CircleSymbol, 11);

            // Modulate the symbol size by size0 to produce a bubble chart effect
            layer0.setSymbolScale(size0);

            // Add a red (0xff9999) line layer to the chart using (data1, angle1)
            PolarLineLayer layer1 = c.addLineLayer(data1, 0xff9999, "Hot Spot");
            layer1.setAngles(angles1);

            // Disable the line by setting its width to 0, so only the symbols are visible
            layer1.setLineWidth(0);

            // Use a circular data point symbol
            layer1.setDataSymbol(Chart.CircleSymbol, 11);

            // Modulate the symbol size by size1 to produce a bubble chart effect
            layer1.setSymbolScale(size1);

            // Output the chart
            viewer.Chart = c;

            //include tool tip for the chart
            viewer.ImageMap = c.getHTMLImageMap("clickable", "",
                "title='{dataSetName} at ({value} km, {angle} deg)\nStrength = {z} Watt'");
        }
    }
}

[ASP.NET Web Forms - C# version] NetWebCharts\CSharpASP\polarbubble.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 data for the chart
    double[] data0 = {6, 12.5, 18.2, 15};
    double[] angles0 = {45, 96, 169, 258};
    double[] size0 = {41, 105, 12, 20};

    double[] data1 = {18, 16, 11, 14};
    double[] angles1 = {30, 210, 240, 310};
    double[] size1 = {30, 45, 12, 90};

    // Create a PolarChart object of size 460 x 460 pixels
    PolarChart c = new PolarChart(460, 460);

    // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
    c.addTitle2(Chart.TopLeft, "<*underline=2*>EM Field Strength", "Arial Bold Italic", 15);

    // Set center of plot area at (230, 240) with radius 180 pixels
    c.setPlotArea(230, 240, 180);

    // Use alternative light grey/dark grey circular background color
    c.setPlotAreaBg(0xdddddd, 0xeeeeee);

    // Set the grid style to circular grid
    c.setGridStyle(false);

    // Add a legend box at the top right corner of the chart using 9pt Arial Bold font
    c.addLegend(459, 0, true, "Arial Bold", 9).setAlignment(Chart.TopRight);

    // Set angular axis as 0 - 360, with a spoke every 30 units
    c.angularAxis().setLinearScale(0, 360, 30);

    // Set the radial axis label format
    c.radialAxis().setLabelFormat("{value} km");

    // Add a blue (0x9999ff) line layer to the chart using (data0, angle0)
    PolarLineLayer layer0 = c.addLineLayer(data0, 0x9999ff, "Cold Spot");
    layer0.setAngles(angles0);

    // Disable the line by setting its width to 0, so only the symbols are visible
    layer0.setLineWidth(0);

    // Use a circular data point symbol
    layer0.setDataSymbol(Chart.CircleSymbol, 11);

    // Modulate the symbol size by size0 to produce a bubble chart effect
    layer0.setSymbolScale(size0);

    // Add a red (0xff9999) line layer to the chart using (data1, angle1)
    PolarLineLayer layer1 = c.addLineLayer(data1, 0xff9999, "Hot Spot");
    layer1.setAngles(angles1);

    // Disable the line by setting its width to 0, so only the symbols are visible
    layer1.setLineWidth(0);

    // Use a circular data point symbol
    layer1.setDataSymbol(Chart.CircleSymbol, 11);

    // Modulate the symbol size by size1 to produce a bubble chart effect
    layer1.setSymbolScale(size1);

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

    // Include tool tip for the chart
    WebChartViewer1.ImageMap = c.getHTMLImageMap("", "",
        "title='{dataSetName} at ({value} km, {angle} deg)\nStrength = {z} Watt'");
}

</script>

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

[ASP.NET Web Forms - VB Version] NetWebCharts\VBNetASP\polarbubble.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 data for the chart
    Dim data0() As Double = {6, 12.5, 18.2, 15}
    Dim angles0() As Double = {45, 96, 169, 258}
    Dim size0() As Double = {41, 105, 12, 20}

    Dim data1() As Double = {18, 16, 11, 14}
    Dim angles1() As Double = {30, 210, 240, 310}
    Dim size1() As Double = {30, 45, 12, 90}

    ' Create a PolarChart object of size 460 x 460 pixels
    Dim c As PolarChart = New PolarChart(460, 460)

    ' Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
    c.addTitle2(Chart.TopLeft, "<*underline=2*>EM Field Strength", "Arial Bold Italic", 15)

    ' Set center of plot area at (230, 240) with radius 180 pixels
    c.setPlotArea(230, 240, 180)

    ' Use alternative light grey/dark grey circular background color
    c.setPlotAreaBg(&Hdddddd, &Heeeeee)

    ' Set the grid style to circular grid
    c.setGridStyle(False)

    ' Add a legend box at the top right corner of the chart using 9pt Arial Bold font
    c.addLegend(459, 0, True, "Arial Bold", 9).setAlignment(Chart.TopRight)

    ' Set angular axis as 0 - 360, with a spoke every 30 units
    c.angularAxis().setLinearScale(0, 360, 30)

    ' Set the radial axis label format
    c.radialAxis().setLabelFormat("{value} km")

    ' Add a blue (0x9999ff) line layer to the chart using (data0, angle0)
    Dim layer0 As PolarLineLayer = c.addLineLayer(data0, &H9999ff, "Cold Spot")
    layer0.setAngles(angles0)

    ' Disable the line by setting its width to 0, so only the symbols are visible
    layer0.setLineWidth(0)

    ' Use a circular data point symbol
    layer0.setDataSymbol(Chart.CircleSymbol, 11)

    ' Modulate the symbol size by size0 to produce a bubble chart effect
    layer0.setSymbolScale(size0)

    ' Add a red (0xff9999) line layer to the chart using (data1, angle1)
    Dim layer1 As PolarLineLayer = c.addLineLayer(data1, &Hff9999, "Hot Spot")
    layer1.setAngles(angles1)

    ' Disable the line by setting its width to 0, so only the symbols are visible
    layer1.setLineWidth(0)

    ' Use a circular data point symbol
    layer1.setDataSymbol(Chart.CircleSymbol, 11)

    ' Modulate the symbol size by size1 to produce a bubble chart effect
    layer1.setSymbolScale(size1)

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

    ' Include tool tip for the chart
    WebChartViewer1.ImageMap = c.getHTMLImageMap("", "", _
        "title='{dataSetName} at ({value} km, {angle} deg)" & vbLf & "Strength = {z} Watt'")

End Sub

</script>

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

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

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

        //
        // Create chart
        //
        private void createChart(RazorChartViewer viewer)
        {
            // The data for the chart
            double[] data0 = {6, 12.5, 18.2, 15};
            double[] angles0 = {45, 96, 169, 258};
            double[] size0 = {41, 105, 12, 20};

            double[] data1 = {18, 16, 11, 14};
            double[] angles1 = {30, 210, 240, 310};
            double[] size1 = {30, 45, 12, 90};

            // Create a PolarChart object of size 460 x 460 pixels
            PolarChart c = new PolarChart(460, 460);

            // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
            c.addTitle2(Chart.TopLeft, "<*underline=2*>EM Field Strength", "Arial Bold Italic", 15);

            // Set center of plot area at (230, 240) with radius 180 pixels
            c.setPlotArea(230, 240, 180);

            // Use alternative light grey/dark grey circular background color
            c.setPlotAreaBg(0xdddddd, 0xeeeeee);

            // Set the grid style to circular grid
            c.setGridStyle(false);

            // Add a legend box at the top right corner of the chart using 9pt Arial Bold font
            c.addLegend(459, 0, true, "Arial Bold", 9).setAlignment(Chart.TopRight);

            // Set angular axis as 0 - 360, with a spoke every 30 units
            c.angularAxis().setLinearScale(0, 360, 30);

            // Set the radial axis label format
            c.radialAxis().setLabelFormat("{value} km");

            // Add a blue (0x9999ff) line layer to the chart using (data0, angle0)
            PolarLineLayer layer0 = c.addLineLayer(data0, 0x9999ff, "Cold Spot");
            layer0.setAngles(angles0);

            // Disable the line by setting its width to 0, so only the symbols are visible
            layer0.setLineWidth(0);

            // Use a circular data point symbol
            layer0.setDataSymbol(Chart.CircleSymbol, 11);

            // Modulate the symbol size by size0 to produce a bubble chart effect
            layer0.setSymbolScale(size0);

            // Add a red (0xff9999) line layer to the chart using (data1, angle1)
            PolarLineLayer layer1 = c.addLineLayer(data1, 0xff9999, "Hot Spot");
            layer1.setAngles(angles1);

            // Disable the line by setting its width to 0, so only the symbols are visible
            layer1.setLineWidth(0);

            // Use a circular data point symbol
            layer1.setDataSymbol(Chart.CircleSymbol, 11);

            // Modulate the symbol size by size1 to produce a bubble chart effect
            layer1.setSymbolScale(size1);

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

            // Include tool tip for the chart
            viewer.ImageMap = c.getHTMLImageMap("", "",
                "title='{dataSetName} at ({value} km, {angle} deg)\nStrength = {z} Watt'");
        }
    }
}

[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>