ChartDirector 6.2 (.NET Edition)

Contour Color Legend




This example demonstrates using a legend box to display the color legend, which is useful for irregularly spaced color scale or for long color labels.

Many of the examples in the documentation uses ColorAxis to both define and display the color scale. This is useful for evenly spaced contours, which are associated with the ticks and labels on the color axis. If the contours are highly uneven (such as at 0, 1, 2, 50, 195, 200), the labels are also unevenly spaced on the color axis, and some labels may become so close together that they overlap.

This example demonstrates an alternative method of using a LegendBox to display color legends. The color axis still defines the color scale, but it is not displayed

Source Code Listing

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

namespace CSharpChartExplorer
{
    public class contourlegend : DemoModule
    {
        //Name of demo module
        public string getName() { return "Contour Color Legend"; }

        //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 x and y coordinates of the grid
            double[] dataX = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
            double[] dataY = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

            // Use random numbers for the z values on the XY grid
            RanSeries r = new RanSeries(999);
            double[] dataZ = r.get2DSeries(dataX.Length, dataY.Length, -0.9, 1.15);

            // Create a XYChart object of size 640 x 460 pixels
            XYChart c = new XYChart(640, 460);

            // Set default text color to dark grey (0x333333)
            c.setColor(Chart.TextColor, 0x333333);

            // Set the plotarea at (30, 25) and of size 400 x 400 pixels. Use semi-transparent grey
            // (0xdd000000) horizontal and vertical grid lines
            c.setPlotArea(50, 25, 400, 400, -1, -1, Chart.Transparent, unchecked((int)0xdd000000),
                -1);

            // Set the x and y axis stems to transparent and the label font to 12pt Arial
            c.xAxis().setColors(Chart.Transparent);
            c.yAxis().setColors(Chart.Transparent);
            c.xAxis().setLabelStyle("Arial", 12);
            c.yAxis().setLabelStyle("Arial", 12);

            // Set the x-axis and y-axis scale
            c.xAxis().setLinearScale(0, 10, 1);
            c.yAxis().setLinearScale(0, 10, 1);

            // Add a contour layer using the given data
            ContourLayer layer = c.addContourLayer(dataX, dataY, dataZ);

            // Move the grid lines in front of the contour layer
            c.getPlotArea().moveGridBefore(layer);

            // Define the color scale
            double[] colorScale = {-0.8, 0x0066ff, -0.5, 0x66ccff, -0.3, 0x66ffff, 0, 0x88ff88, 0.4,
                0x00ff00, 0.7, 0xffff00, 0.9, 0xff6600, 1.0, 0xcc0000, 1.1};
            // Apply the color scale, and specify the underflow and overflow colors for regions
            // exceeding the color scale
            layer.colorAxis().setColorScale(colorScale, 0x0000cc, 0x000000);

            //
            // Instead of displaying the color axis, we use a legend box to display the colors. This
            // is useful for colors that are unevenly spaced on the color axis.
            //

            // Add a legend box at (460, 25) with vertical layout, with 12pt Arial font, transparent
            // background and border, icon size of 15 x 15 pixels, and line spacing of 8 pixels.
            LegendBox b = c.addLegend(460, 25, true, "Arial", 12);
            b.setBackground(Chart.Transparent, Chart.Transparent);
            b.setKeySize(15, 15);
            b.setKeySpacing(0, 8);

            // Add the legend box entries
            b.addKey("> 1.1 (Critical)", 0x000000);
            b.addKey("1.0 to 1.1 (Alert)", 0xcc0000);
            b.addKey("0.9 to 1.0", 0xff6600);
            b.addKey("0.7 to 0.9", 0xffff00);
            b.addKey("0.4 to 0.7", 0x00ff00);
            b.addKey("0.0 to 0.4", 0x88ff88);
            b.addKey("-0.3 to 0.0", 0x66ffff);
            b.addKey("-0.5 to -0.3", 0x66ccff);
            b.addKey("-0.8 to -0.5", 0x0066ff);
            b.addKey("< -0.8", 0x0000cc);

            // Output the chart
            viewer.Chart = c;
        }
    }
}

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

Public Class contourlegend
    Implements DemoModule

    'Name of demo module
    Public Function getName() As String Implements DemoModule.getName
        Return "Contour Color Legend"
    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 x and y coordinates of the grid
        Dim dataX() As Double = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
        Dim dataY() As Double = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

        ' Use random numbers for the z values on the XY grid
        Dim r As RanSeries = New RanSeries(999)
        Dim dataZ() As Double = r.get2DSeries(UBound(dataX) + 1, UBound(dataY) + 1, -0.9, 1.15)

        ' Create a XYChart object of size 640 x 460 pixels
        Dim c As XYChart = New XYChart(640, 460)

        ' Set default text color to dark grey (0x333333)
        c.setColor(Chart.TextColor, &H333333)

        ' Set the plotarea at (30, 25) and of size 400 x 400 pixels. Use semi-transparent grey
        ' (0xdd000000) horizontal and vertical grid lines
        c.setPlotArea(50, 25, 400, 400, -1, -1, Chart.Transparent, &Hdd000000, -1)

        ' Set the x and y axis stems to transparent and the label font to 12pt Arial
        c.xAxis().setColors(Chart.Transparent)
        c.yAxis().setColors(Chart.Transparent)
        c.xAxis().setLabelStyle("Arial", 12)
        c.yAxis().setLabelStyle("Arial", 12)

        ' Set the x-axis and y-axis scale
        c.xAxis().setLinearScale(0, 10, 1)
        c.yAxis().setLinearScale(0, 10, 1)

        ' Add a contour layer using the given data
        Dim layer As ContourLayer = c.addContourLayer(dataX, dataY, dataZ)

        ' Move the grid lines in front of the contour layer
        c.getPlotArea().moveGridBefore(layer)

        ' Define the color scale
        Dim colorScale() As Double = {-0.8, &H0066ff, -0.5, &H66ccff, -0.3, &H66ffff, 0, &H88ff88, _
            0.4, &H00ff00, 0.7, &Hffff00, 0.9, &Hff6600, 1.0, &Hcc0000, 1.1}
        ' Apply the color scale, and specify the underflow and overflow colors for regions exceeding
        ' the color scale
        layer.colorAxis().setColorScale(colorScale, &H0000cc, &H000000)

        '
        ' Instead of displaying the color axis, we use a legend box to display the colors. This is
        ' useful for colors that are unevenly spaced on the color axis.
        '

        ' Add a legend box at (460, 25) with vertical layout, with 12pt Arial font, transparent
        ' background and border, icon size of 15 x 15 pixels, and line spacing of 8 pixels.
        Dim b As LegendBox = c.addLegend(460, 25, True, "Arial", 12)
        b.setBackground(Chart.Transparent, Chart.Transparent)
        b.setKeySize(15, 15)
        b.setKeySpacing(0, 8)

        ' Add the legend box entries
        b.addKey("> 1.1 (Critical)", &H000000)
        b.addKey("1.0 to 1.1 (Alert)", &Hcc0000)
        b.addKey("0.9 to 1.0", &Hff6600)
        b.addKey("0.7 to 0.9", &Hffff00)
        b.addKey("0.4 to 0.7", &H00ff00)
        b.addKey("0.0 to 0.4", &H88ff88)
        b.addKey("-0.3 to 0.0", &H66ffff)
        b.addKey("-0.5 to -0.3", &H66ccff)
        b.addKey("-0.8 to -0.5", &H0066ff)
        b.addKey("< -0.8", &H0000cc)

        ' Output the chart
        viewer.Chart = c

    End Sub

End Class

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

namespace CSharpWPFDemo
{
    public class contourlegend : DemoModule
    {
        //Name of demo module
        public string getName() { return "Contour Color Legend"; }

        //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 x and y coordinates of the grid
            double[] dataX = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
            double[] dataY = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

            // Use random numbers for the z values on the XY grid
            RanSeries r = new RanSeries(999);
            double[] dataZ = r.get2DSeries(dataX.Length, dataY.Length, -0.9, 1.15);

            // Create a XYChart object of size 640 x 460 pixels
            XYChart c = new XYChart(640, 460);

            // Set default text color to dark grey (0x333333)
            c.setColor(Chart.TextColor, 0x333333);

            // Set the plotarea at (30, 25) and of size 400 x 400 pixels. Use semi-transparent grey
            // (0xdd000000) horizontal and vertical grid lines
            c.setPlotArea(50, 25, 400, 400, -1, -1, Chart.Transparent, unchecked((int)0xdd000000),
                -1);

            // Set the x and y axis stems to transparent and the label font to 12pt Arial
            c.xAxis().setColors(Chart.Transparent);
            c.yAxis().setColors(Chart.Transparent);
            c.xAxis().setLabelStyle("Arial", 12);
            c.yAxis().setLabelStyle("Arial", 12);

            // Set the x-axis and y-axis scale
            c.xAxis().setLinearScale(0, 10, 1);
            c.yAxis().setLinearScale(0, 10, 1);

            // Add a contour layer using the given data
            ContourLayer layer = c.addContourLayer(dataX, dataY, dataZ);

            // Move the grid lines in front of the contour layer
            c.getPlotArea().moveGridBefore(layer);

            // Define the color scale
            double[] colorScale = {-0.8, 0x0066ff, -0.5, 0x66ccff, -0.3, 0x66ffff, 0, 0x88ff88, 0.4,
                0x00ff00, 0.7, 0xffff00, 0.9, 0xff6600, 1.0, 0xcc0000, 1.1};
            // Apply the color scale, and specify the underflow and overflow colors for regions
            // exceeding the color scale
            layer.colorAxis().setColorScale(colorScale, 0x0000cc, 0x000000);

            //
            // Instead of displaying the color axis, we use a legend box to display the colors. This
            // is useful for colors that are unevenly spaced on the color axis.
            //

            // Add a legend box at (460, 25) with vertical layout, with 12pt Arial font, transparent
            // background and border, icon size of 15 x 15 pixels, and line spacing of 8 pixels.
            LegendBox b = c.addLegend(460, 25, true, "Arial", 12);
            b.setBackground(Chart.Transparent, Chart.Transparent);
            b.setKeySize(15, 15);
            b.setKeySpacing(0, 8);

            // Add the legend box entries
            b.addKey("> 1.1 (Critical)", 0x000000);
            b.addKey("1.0 to 1.1 (Alert)", 0xcc0000);
            b.addKey("0.9 to 1.0", 0xff6600);
            b.addKey("0.7 to 0.9", 0xffff00);
            b.addKey("0.4 to 0.7", 0x00ff00);
            b.addKey("0.0 to 0.4", 0x88ff88);
            b.addKey("-0.3 to 0.0", 0x66ffff);
            b.addKey("-0.5 to -0.3", 0x66ccff);
            b.addKey("-0.8 to -0.5", 0x0066ff);
            b.addKey("< -0.8", 0x0000cc);

            // Output the chart
            viewer.Chart = c;
        }
    }
}

[ASP.NET Web Forms - C# version] NetWebCharts\CSharpASP\contourlegend.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 x and y coordinates of the grid
    double[] dataX = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    double[] dataY = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

    // Use random numbers for the z values on the XY grid
    RanSeries r = new RanSeries(999);
    double[] dataZ = r.get2DSeries(dataX.Length, dataY.Length, -0.9, 1.15);

    // Create a XYChart object of size 640 x 460 pixels
    XYChart c = new XYChart(640, 460);

    // Set default text color to dark grey (0x333333)
    c.setColor(Chart.TextColor, 0x333333);

    // Set the plotarea at (30, 25) and of size 400 x 400 pixels. Use semi-transparent grey
    // (0xdd000000) horizontal and vertical grid lines
    c.setPlotArea(50, 25, 400, 400, -1, -1, Chart.Transparent, unchecked((int)0xdd000000), -1);

    // Set the x and y axis stems to transparent and the label font to 12pt Arial
    c.xAxis().setColors(Chart.Transparent);
    c.yAxis().setColors(Chart.Transparent);
    c.xAxis().setLabelStyle("Arial", 12);
    c.yAxis().setLabelStyle("Arial", 12);

    // Set the x-axis and y-axis scale
    c.xAxis().setLinearScale(0, 10, 1);
    c.yAxis().setLinearScale(0, 10, 1);

    // Add a contour layer using the given data
    ContourLayer layer = c.addContourLayer(dataX, dataY, dataZ);

    // Move the grid lines in front of the contour layer
    c.getPlotArea().moveGridBefore(layer);

    // Define the color scale
    double[] colorScale = {-0.8, 0x0066ff, -0.5, 0x66ccff, -0.3, 0x66ffff, 0, 0x88ff88, 0.4,
        0x00ff00, 0.7, 0xffff00, 0.9, 0xff6600, 1.0, 0xcc0000, 1.1};
    // Apply the color scale, and specify the underflow and overflow colors for regions exceeding
    // the color scale
    layer.colorAxis().setColorScale(colorScale, 0x0000cc, 0x000000);

    //
    // Instead of displaying the color axis, we use a legend box to display the colors. This is
    // useful for colors that are unevenly spaced on the color axis.
    //

    // Add a legend box at (460, 25) with vertical layout, with 12pt Arial font, transparent
    // background and border, icon size of 15 x 15 pixels, and line spacing of 8 pixels.
    LegendBox b = c.addLegend(460, 25, true, "Arial", 12);
    b.setBackground(Chart.Transparent, Chart.Transparent);
    b.setKeySize(15, 15);
    b.setKeySpacing(0, 8);

    // Add the legend box entries
    b.addKey("> 1.1 (Critical)", 0x000000);
    b.addKey("1.0 to 1.1 (Alert)", 0xcc0000);
    b.addKey("0.9 to 1.0", 0xff6600);
    b.addKey("0.7 to 0.9", 0xffff00);
    b.addKey("0.4 to 0.7", 0x00ff00);
    b.addKey("0.0 to 0.4", 0x88ff88);
    b.addKey("-0.3 to 0.0", 0x66ffff);
    b.addKey("-0.5 to -0.3", 0x66ccff);
    b.addKey("-0.8 to -0.5", 0x0066ff);
    b.addKey("< -0.8", 0x0000cc);

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

</script>

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

[ASP.NET Web Forms - VB Version] NetWebCharts\VBNetASP\contourlegend.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 x and y coordinates of the grid
    Dim dataX() As Double = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
    Dim dataY() As Double = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

    ' Use random numbers for the z values on the XY grid
    Dim r As RanSeries = New RanSeries(999)
    Dim dataZ() As Double = r.get2DSeries(UBound(dataX) + 1, UBound(dataY) + 1, -0.9, 1.15)

    ' Create a XYChart object of size 640 x 460 pixels
    Dim c As XYChart = New XYChart(640, 460)

    ' Set default text color to dark grey (0x333333)
    c.setColor(Chart.TextColor, &H333333)

    ' Set the plotarea at (30, 25) and of size 400 x 400 pixels. Use semi-transparent grey
    ' (0xdd000000) horizontal and vertical grid lines
    c.setPlotArea(50, 25, 400, 400, -1, -1, Chart.Transparent, &Hdd000000, -1)

    ' Set the x and y axis stems to transparent and the label font to 12pt Arial
    c.xAxis().setColors(Chart.Transparent)
    c.yAxis().setColors(Chart.Transparent)
    c.xAxis().setLabelStyle("Arial", 12)
    c.yAxis().setLabelStyle("Arial", 12)

    ' Set the x-axis and y-axis scale
    c.xAxis().setLinearScale(0, 10, 1)
    c.yAxis().setLinearScale(0, 10, 1)

    ' Add a contour layer using the given data
    Dim layer As ContourLayer = c.addContourLayer(dataX, dataY, dataZ)

    ' Move the grid lines in front of the contour layer
    c.getPlotArea().moveGridBefore(layer)

    ' Define the color scale
    Dim colorScale() As Double = {-0.8, &H0066ff, -0.5, &H66ccff, -0.3, &H66ffff, 0, &H88ff88, _
        0.4, &H00ff00, 0.7, &Hffff00, 0.9, &Hff6600, 1.0, &Hcc0000, 1.1}
    ' Apply the color scale, and specify the underflow and overflow colors for regions exceeding the
    ' color scale
    layer.colorAxis().setColorScale(colorScale, &H0000cc, &H000000)

    '
    ' Instead of displaying the color axis, we use a legend box to display the colors. This is
    ' useful for colors that are unevenly spaced on the color axis.
    '

    ' Add a legend box at (460, 25) with vertical layout, with 12pt Arial font, transparent
    ' background and border, icon size of 15 x 15 pixels, and line spacing of 8 pixels.
    Dim b As LegendBox = c.addLegend(460, 25, True, "Arial", 12)
    b.setBackground(Chart.Transparent, Chart.Transparent)
    b.setKeySize(15, 15)
    b.setKeySpacing(0, 8)

    ' Add the legend box entries
    b.addKey("> 1.1 (Critical)", &H000000)
    b.addKey("1.0 to 1.1 (Alert)", &Hcc0000)
    b.addKey("0.9 to 1.0", &Hff6600)
    b.addKey("0.7 to 0.9", &Hffff00)
    b.addKey("0.4 to 0.7", &H00ff00)
    b.addKey("0.0 to 0.4", &H88ff88)
    b.addKey("-0.3 to 0.0", &H66ffff)
    b.addKey("-0.5 to -0.3", &H66ccff)
    b.addKey("-0.8 to -0.5", &H0066ff)
    b.addKey("< -0.8", &H0000cc)

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

End Sub

</script>

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

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

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

        //
        // Create chart
        //
        private void createChart(RazorChartViewer viewer)
        {
            // The x and y coordinates of the grid
            double[] dataX = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
            double[] dataY = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

            // Use random numbers for the z values on the XY grid
            RanSeries r = new RanSeries(999);
            double[] dataZ = r.get2DSeries(dataX.Length, dataY.Length, -0.9, 1.15);

            // Create a XYChart object of size 640 x 460 pixels
            XYChart c = new XYChart(640, 460);

            // Set default text color to dark grey (0x333333)
            c.setColor(Chart.TextColor, 0x333333);

            // Set the plotarea at (30, 25) and of size 400 x 400 pixels. Use semi-transparent grey
            // (0xdd000000) horizontal and vertical grid lines
            c.setPlotArea(50, 25, 400, 400, -1, -1, Chart.Transparent, unchecked((int)0xdd000000), -1);

            // Set the x and y axis stems to transparent and the label font to 12pt Arial
            c.xAxis().setColors(Chart.Transparent);
            c.yAxis().setColors(Chart.Transparent);
            c.xAxis().setLabelStyle("Arial", 12);
            c.yAxis().setLabelStyle("Arial", 12);

            // Set the x-axis and y-axis scale
            c.xAxis().setLinearScale(0, 10, 1);
            c.yAxis().setLinearScale(0, 10, 1);

            // Add a contour layer using the given data
            ContourLayer layer = c.addContourLayer(dataX, dataY, dataZ);

            // Move the grid lines in front of the contour layer
            c.getPlotArea().moveGridBefore(layer);

            // Define the color scale
            double[] colorScale = {-0.8, 0x0066ff, -0.5, 0x66ccff, -0.3, 0x66ffff, 0, 0x88ff88, 0.4,
                0x00ff00, 0.7, 0xffff00, 0.9, 0xff6600, 1.0, 0xcc0000, 1.1};
            // Apply the color scale, and specify the underflow and overflow colors for regions exceeding
            // the color scale
            layer.colorAxis().setColorScale(colorScale, 0x0000cc, 0x000000);

            //
            // Instead of displaying the color axis, we use a legend box to display the colors. This is
            // useful for colors that are unevenly spaced on the color axis.
            //

            // Add a legend box at (460, 25) with vertical layout, with 12pt Arial font, transparent
            // background and border, icon size of 15 x 15 pixels, and line spacing of 8 pixels.
            LegendBox b = c.addLegend(460, 25, true, "Arial", 12);
            b.setBackground(Chart.Transparent, Chart.Transparent);
            b.setKeySize(15, 15);
            b.setKeySpacing(0, 8);

            // Add the legend box entries
            b.addKey("> 1.1 (Critical)", 0x000000);
            b.addKey("1.0 to 1.1 (Alert)", 0xcc0000);
            b.addKey("0.9 to 1.0", 0xff6600);
            b.addKey("0.7 to 0.9", 0xffff00);
            b.addKey("0.4 to 0.7", 0x00ff00);
            b.addKey("0.0 to 0.4", 0x88ff88);
            b.addKey("-0.3 to 0.0", 0x66ffff);
            b.addKey("-0.5 to -0.3", 0x66ccff);
            b.addKey("-0.8 to -0.5", 0x0066ff);
            b.addKey("< -0.8", 0x0000cc);

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

[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>