ChartDirector 6.2 (.NET Edition)

Contour Color Scale


      

This example demonstrates using various coloring for the ContourLayer.

The ChartDirector supports two ways to configure the colors for a contour.

This example includes 4 charts to demonstrate both of the above methods.

Source Code Listing

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

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

        //Number of charts produced in this demo module
        public int getNoOfCharts() { return 4; }

        //Main code for creating charts
        public void createChart(WinChartViewer viewer, int chartIndex)
        {
            // The x and y coordinates of the grid
            double[] dataX = {-4, -3, -2, -1, 0, 1, 2, 3, 4};
            double[] dataY = {-4, -3, -2, -1, 0, 1, 2, 3, 4};

            // Use random numbers for the z values on the XY grid
            RanSeries r = new RanSeries(99);
            double[] dataZ = r.get2DSeries(dataX.Length, dataY.Length, -0.9, 0.9);

            // Create a XYChart object of size 420 x 360 pixels
            XYChart c = new XYChart(420, 360);

            // Set the plotarea at (30, 25) and of size 300 x 300 pixels. Use semi-transparent grey
            // (0xdd000000) horizontal and vertical grid lines
            c.setPlotArea(30, 25, 300, 300, -1, -1, -1, unchecked((int)0xdd000000), -1);

            // Set the x-axis and y-axis scale
            c.xAxis().setLinearScale(-4, 4, 1);
            c.yAxis().setLinearScale(-4, 4, 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);

            // Add a color axis (the legend) in which the top left corner is anchored at (350, 25).
            // Set the length to 400 300 and the labels on the right side.
            ColorAxis cAxis = layer.setColorAxis(350, 25, Chart.TopLeft, 300, Chart.Right);

            if (chartIndex == 1) {
                // Speicify a color gradient as a list of colors, and use it in the color axis.
                int[] colorGradient = {0x0044cc, 0xffffff, 0x00aa00};
                cAxis.setColorGradient(false, colorGradient);
            } else if (chartIndex == 2) {
                // Specify the color scale to use in the color axis
                double[] colorScale = {-1.0, 0x1a9850, -0.75, 0x66bd63, -0.5, 0xa6d96a, -0.25,
                    0xd9ef8b, 0, 0xfee08b, 0.25, 0xfdae61, 0.5, 0xf46d43, 0.75, 0xd73027, 1};
                cAxis.setColorScale(colorScale);
            } else if (chartIndex == 3) {
                // Specify the color scale to use in the color axis. Also specify an underflow color
                // 0x66ccff (blue) for regions that fall below the lower axis limit.
                double[] colorScale = {0, 0xffff99, 0.2, 0x80cdc1, 0.4, 0x35978f, 0.6, 0x01665e,
                    0.8, 0x003c30, 1};
                cAxis.setColorScale(colorScale, 0x66ccff);
            }

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

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

Public Class contourcolor
    Implements DemoModule

    'Name of demo module
    Public Function getName() As String Implements DemoModule.getName
        Return "Contour Color Scale"
    End Function

    'Number of charts produced in this demo module
    Public Function getNoOfCharts() As Integer Implements DemoModule.getNoOfCharts
        Return 4
    End Function

    'Main code for creating charts
    Public Sub createChart(viewer As WinChartViewer, chartIndex As Integer) _
        Implements DemoModule.createChart

        ' The x and y coordinates of the grid
        Dim dataX() As Double = {-4, -3, -2, -1, 0, 1, 2, 3, 4}
        Dim dataY() As Double = {-4, -3, -2, -1, 0, 1, 2, 3, 4}

        ' Use random numbers for the z values on the XY grid
        Dim r As RanSeries = New RanSeries(99)
        Dim dataZ() As Double = r.get2DSeries(UBound(dataX) + 1, UBound(dataY) + 1, -0.9, 0.9)

        ' Create a XYChart object of size 420 x 360 pixels
        Dim c As XYChart = New XYChart(420, 360)

        ' Set the plotarea at (30, 25) and of size 300 x 300 pixels. Use semi-transparent grey
        ' (0xdd000000) horizontal and vertical grid lines
        c.setPlotArea(30, 25, 300, 300, -1, -1, -1, &Hdd000000, -1)

        ' Set the x-axis and y-axis scale
        c.xAxis().setLinearScale(-4, 4, 1)
        c.yAxis().setLinearScale(-4, 4, 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)

        ' Add a color axis (the legend) in which the top left corner is anchored at (350, 25). Set
        ' the length to 400 300 and the labels on the right side.
        Dim cAxis As ColorAxis = layer.setColorAxis(350, 25, Chart.TopLeft, 300, Chart.Right)

        If chartIndex = 1 Then
            ' Speicify a color gradient as a list of colors, and use it in the color axis.
            Dim colorGradient() As Integer = {&H0044cc, &Hffffff, &H00aa00}
            cAxis.setColorGradient(False, colorGradient)
        ElseIf chartIndex = 2 Then
            ' Specify the color scale to use in the color axis
            Dim colorScale() As Double = {-1.0, &H1a9850, -0.75, &H66bd63, -0.5, &Ha6d96a, -0.25, _
                &Hd9ef8b, 0, &Hfee08b, 0.25, &Hfdae61, 0.5, &Hf46d43, 0.75, &Hd73027, 1}
            cAxis.setColorScale(colorScale)
        ElseIf chartIndex = 3 Then
            ' Specify the color scale to use in the color axis. Also specify an underflow color
            ' 0x66ccff (blue) for regions that fall below the lower axis limit.
            Dim colorScale() As Double = {0, &Hffff99, 0.2, &H80cdc1, 0.4, &H35978f, 0.6, _
                &H01665e, 0.8, &H003c30, 1}
            cAxis.setColorScale(colorScale, &H66ccff)
        End If

        ' Output the chart
        viewer.Chart = c

    End Sub

End Class

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

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

        //Number of charts produced in this demo module
        public int getNoOfCharts() { return 4; }

        //Main code for creating charts
        public void createChart(WPFChartViewer viewer, int chartIndex)
        {
            // The x and y coordinates of the grid
            double[] dataX = {-4, -3, -2, -1, 0, 1, 2, 3, 4};
            double[] dataY = {-4, -3, -2, -1, 0, 1, 2, 3, 4};

            // Use random numbers for the z values on the XY grid
            RanSeries r = new RanSeries(99);
            double[] dataZ = r.get2DSeries(dataX.Length, dataY.Length, -0.9, 0.9);

            // Create a XYChart object of size 420 x 360 pixels
            XYChart c = new XYChart(420, 360);

            // Set the plotarea at (30, 25) and of size 300 x 300 pixels. Use semi-transparent grey
            // (0xdd000000) horizontal and vertical grid lines
            c.setPlotArea(30, 25, 300, 300, -1, -1, -1, unchecked((int)0xdd000000), -1);

            // Set the x-axis and y-axis scale
            c.xAxis().setLinearScale(-4, 4, 1);
            c.yAxis().setLinearScale(-4, 4, 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);

            // Add a color axis (the legend) in which the top left corner is anchored at (350, 25).
            // Set the length to 400 300 and the labels on the right side.
            ColorAxis cAxis = layer.setColorAxis(350, 25, Chart.TopLeft, 300, Chart.Right);

            if (chartIndex == 1) {
                // Speicify a color gradient as a list of colors, and use it in the color axis.
                int[] colorGradient = {0x0044cc, 0xffffff, 0x00aa00};
                cAxis.setColorGradient(false, colorGradient);
            } else if (chartIndex == 2) {
                // Specify the color scale to use in the color axis
                double[] colorScale = {-1.0, 0x1a9850, -0.75, 0x66bd63, -0.5, 0xa6d96a, -0.25,
                    0xd9ef8b, 0, 0xfee08b, 0.25, 0xfdae61, 0.5, 0xf46d43, 0.75, 0xd73027, 1};
                cAxis.setColorScale(colorScale);
            } else if (chartIndex == 3) {
                // Specify the color scale to use in the color axis. Also specify an underflow color
                // 0x66ccff (blue) for regions that fall below the lower axis limit.
                double[] colorScale = {0, 0xffff99, 0.2, 0x80cdc1, 0.4, 0x35978f, 0.6, 0x01665e,
                    0.8, 0x003c30, 1};
                cAxis.setColorScale(colorScale, 0x66ccff);
            }

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

[ASP.NET Web Forms - C# version] NetWebCharts\CSharpASP\contourcolor.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">

//
// Create chart
//
protected void createChart(WebChartViewer viewer, int chartIndex)
{
    // The x and y coordinates of the grid
    double[] dataX = {-4, -3, -2, -1, 0, 1, 2, 3, 4};
    double[] dataY = {-4, -3, -2, -1, 0, 1, 2, 3, 4};

    // Use random numbers for the z values on the XY grid
    RanSeries r = new RanSeries(99);
    double[] dataZ = r.get2DSeries(dataX.Length, dataY.Length, -0.9, 0.9);

    // Create a XYChart object of size 420 x 360 pixels
    XYChart c = new XYChart(420, 360);

    // Set the plotarea at (30, 25) and of size 300 x 300 pixels. Use semi-transparent grey
    // (0xdd000000) horizontal and vertical grid lines
    c.setPlotArea(30, 25, 300, 300, -1, -1, -1, unchecked((int)0xdd000000), -1);

    // Set the x-axis and y-axis scale
    c.xAxis().setLinearScale(-4, 4, 1);
    c.yAxis().setLinearScale(-4, 4, 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);

    // Add a color axis (the legend) in which the top left corner is anchored at (350, 25). Set the
    // length to 400 300 and the labels on the right side.
    ColorAxis cAxis = layer.setColorAxis(350, 25, Chart.TopLeft, 300, Chart.Right);

    if (chartIndex == 1) {
        // Speicify a color gradient as a list of colors, and use it in the color axis.
        int[] colorGradient = {0x0044cc, 0xffffff, 0x00aa00};
        cAxis.setColorGradient(false, colorGradient);
    } else if (chartIndex == 2) {
        // Specify the color scale to use in the color axis
        double[] colorScale = {-1.0, 0x1a9850, -0.75, 0x66bd63, -0.5, 0xa6d96a, -0.25, 0xd9ef8b, 0,
            0xfee08b, 0.25, 0xfdae61, 0.5, 0xf46d43, 0.75, 0xd73027, 1};
        cAxis.setColorScale(colorScale);
    } else if (chartIndex == 3) {
        // Specify the color scale to use in the color axis. Also specify an underflow color
        // 0x66ccff (blue) for regions that fall below the lower axis limit.
        double[] colorScale = {0, 0xffff99, 0.2, 0x80cdc1, 0.4, 0x35978f, 0.6, 0x01665e, 0.8,
            0x003c30, 1};
        cAxis.setColorScale(colorScale, 0x66ccff);
    }

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

//
// Page Load event handler
//
protected void Page_Load(object sender, EventArgs e)
{
    createChart(WebChartViewer0, 0);
    createChart(WebChartViewer1, 1);
    createChart(WebChartViewer2, 2);
    createChart(WebChartViewer3, 3);
}

</script>

<html>
<body>
    <chart:WebChartViewer id="WebChartViewer0" runat="server" />
    <chart:WebChartViewer id="WebChartViewer1" runat="server" />
    <chart:WebChartViewer id="WebChartViewer2" runat="server" />
    <chart:WebChartViewer id="WebChartViewer3" runat="server" />
</body>
</html>

[ASP.NET Web Forms - VB Version] NetWebCharts\VBNetASP\contourcolor.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">

'
' Create chart
'
Protected Sub createChart(viewer As WebChartViewer, chartIndex As Integer)

    ' The x and y coordinates of the grid
    Dim dataX() As Double = {-4, -3, -2, -1, 0, 1, 2, 3, 4}
    Dim dataY() As Double = {-4, -3, -2, -1, 0, 1, 2, 3, 4}

    ' Use random numbers for the z values on the XY grid
    Dim r As RanSeries = New RanSeries(99)
    Dim dataZ() As Double = r.get2DSeries(UBound(dataX) + 1, UBound(dataY) + 1, -0.9, 0.9)

    ' Create a XYChart object of size 420 x 360 pixels
    Dim c As XYChart = New XYChart(420, 360)

    ' Set the plotarea at (30, 25) and of size 300 x 300 pixels. Use semi-transparent grey
    ' (0xdd000000) horizontal and vertical grid lines
    c.setPlotArea(30, 25, 300, 300, -1, -1, -1, &Hdd000000, -1)

    ' Set the x-axis and y-axis scale
    c.xAxis().setLinearScale(-4, 4, 1)
    c.yAxis().setLinearScale(-4, 4, 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)

    ' Add a color axis (the legend) in which the top left corner is anchored at (350, 25). Set the
    ' length to 400 300 and the labels on the right side.
    Dim cAxis As ColorAxis = layer.setColorAxis(350, 25, Chart.TopLeft, 300, Chart.Right)

    If chartIndex = 1 Then
        ' Speicify a color gradient as a list of colors, and use it in the color axis.
        Dim colorGradient() As Integer = {&H0044cc, &Hffffff, &H00aa00}
        cAxis.setColorGradient(False, colorGradient)
    ElseIf chartIndex = 2 Then
        ' Specify the color scale to use in the color axis
        Dim colorScale() As Double = {-1.0, &H1a9850, -0.75, &H66bd63, -0.5, &Ha6d96a, -0.25, _
            &Hd9ef8b, 0, &Hfee08b, 0.25, &Hfdae61, 0.5, &Hf46d43, 0.75, &Hd73027, 1}
        cAxis.setColorScale(colorScale)
    ElseIf chartIndex = 3 Then
        ' Specify the color scale to use in the color axis. Also specify an underflow color 0x66ccff
        ' (blue) for regions that fall below the lower axis limit.
        Dim colorScale() As Double = {0, &Hffff99, 0.2, &H80cdc1, 0.4, &H35978f, 0.6, &H01665e, _
            0.8, &H003c30, 1}
        cAxis.setColorScale(colorScale, &H66ccff)
    End If

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

End Sub

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

    createChart(WebChartViewer0, 0)
    createChart(WebChartViewer1, 1)
    createChart(WebChartViewer2, 2)
    createChart(WebChartViewer3, 3)

End Sub

</script>

<html>
<body>
    <chart:WebChartViewer id="WebChartViewer0" runat="server" />
    <chart:WebChartViewer id="WebChartViewer1" runat="server" />
    <chart:WebChartViewer id="WebChartViewer2" runat="server" />
    <chart:WebChartViewer id="WebChartViewer3" runat="server" />
</body>
</html>

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

namespace NetMvcCharts.Controllers
{
    public class ContourcolorController : Controller
    {
        //
        // Default Action
        //
        public ActionResult Index()
        {
            ViewBag.Title = "Contour Color Scale";

            // This example contains 4 charts.
            ViewBag.Viewer = new RazorChartViewer[4];
            for (int i = 0; i < ViewBag.Viewer.Length; ++i)
                createChart(ViewBag.Viewer[i] = new RazorChartViewer(HttpContext, "chart" + i), i);

            return View("~/Views/Shared/ChartView.cshtml");
        }

        //
        // Create chart
        //
        private void createChart(RazorChartViewer viewer, int chartIndex)
        {
            // The x and y coordinates of the grid
            double[] dataX = {-4, -3, -2, -1, 0, 1, 2, 3, 4};
            double[] dataY = {-4, -3, -2, -1, 0, 1, 2, 3, 4};

            // Use random numbers for the z values on the XY grid
            RanSeries r = new RanSeries(99);
            double[] dataZ = r.get2DSeries(dataX.Length, dataY.Length, -0.9, 0.9);

            // Create a XYChart object of size 420 x 360 pixels
            XYChart c = new XYChart(420, 360);

            // Set the plotarea at (30, 25) and of size 300 x 300 pixels. Use semi-transparent grey
            // (0xdd000000) horizontal and vertical grid lines
            c.setPlotArea(30, 25, 300, 300, -1, -1, -1, unchecked((int)0xdd000000), -1);

            // Set the x-axis and y-axis scale
            c.xAxis().setLinearScale(-4, 4, 1);
            c.yAxis().setLinearScale(-4, 4, 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);

            // Add a color axis (the legend) in which the top left corner is anchored at (350, 25). Set
            // the length to 400 300 and the labels on the right side.
            ColorAxis cAxis = layer.setColorAxis(350, 25, Chart.TopLeft, 300, Chart.Right);

            if (chartIndex == 1) {
                // Speicify a color gradient as a list of colors, and use it in the color axis.
                int[] colorGradient = {0x0044cc, 0xffffff, 0x00aa00};
                cAxis.setColorGradient(false, colorGradient);
            } else if (chartIndex == 2) {
                // Specify the color scale to use in the color axis
                double[] colorScale = {-1.0, 0x1a9850, -0.75, 0x66bd63, -0.5, 0xa6d96a, -0.25, 0xd9ef8b,
                    0, 0xfee08b, 0.25, 0xfdae61, 0.5, 0xf46d43, 0.75, 0xd73027, 1};
                cAxis.setColorScale(colorScale);
            } else if (chartIndex == 3) {
                // Specify the color scale to use in the color axis. Also specify an underflow color
                // 0x66ccff (blue) for regions that fall below the lower axis limit.
                double[] colorScale = {0, 0xffff99, 0.2, 0x80cdc1, 0.4, 0x35978f, 0.6, 0x01665e, 0.8,
                    0x003c30, 1};
                cAxis.setColorScale(colorScale, 0x66ccff);
            }

            // 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>