ChartDirector 6.2 (.NET Edition)

Start Angle and Direction


  

This example demonstrates different sector layout angles and directions.

By default, ChartDirector positions sectors starting from the upward pointing position, and in clockwise direction.

The start angle and layout direction can be changed using PieChart.setStartAngle.

One common application for PieChart.setStartAngle is to facilitate layout of pie charts containing many small sectors. Please refer to Side Label Layout for an example.

Source Code Listing

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

namespace CSharpChartExplorer
{
    public class anglepie : DemoModule
    {
        //Name of demo module
        public string getName() { return "Start Angle and Direction"; }

        //Number of charts produced in this demo module
        public int getNoOfCharts() { return 2; }

        //Main code for creating charts
        public void createChart(WinChartViewer viewer, int chartIndex)
        {
            // The data for the pie chart
            double[] data = {25, 18, 15, 12, 8, 30, 35};

            // The labels for the pie chart
            string[] labels = {"Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities",
                "Production"};

            // Create a PieChart object of size 280 x 240 pixels
            PieChart c = new PieChart(280, 240);

            // Set the center of the pie at (140, 130) and the radius to 80 pixels
            c.setPieSize(140, 130, 80);

            // Add a title to the pie to show the start angle and direction
            if (chartIndex == 0) {
                c.addTitle("Start Angle = 0 degrees\nDirection = Clockwise");
            } else {
                c.addTitle("Start Angle = 90 degrees\nDirection = AntiClockwise");
                c.setStartAngle(90, false);
            }

            // Draw the pie in 3D
            c.set3D();

            // Set the pie data and the pie labels
            c.setData(data, labels);

            // Explode the 1st sector (index = 0)
            c.setExplode(0);

            // Output the chart
            viewer.Chart = c;

            //include tool tip for the chart
            viewer.ImageMap = c.getHTMLImageMap("clickable", "",
                "title='{label}: US${value}K ({percent}%)'");
        }
    }
}

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

Public Class anglepie
    Implements DemoModule

    'Name of demo module
    Public Function getName() As String Implements DemoModule.getName
        Return "Start Angle and Direction"
    End Function

    'Number of charts produced in this demo module
    Public Function getNoOfCharts() As Integer Implements DemoModule.getNoOfCharts
        Return 2
    End Function

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

        ' The data for the pie chart
        Dim data() As Double = {25, 18, 15, 12, 8, 30, 35}

        ' The labels for the pie chart
        Dim labels() As String = {"Labor", "Licenses", "Taxes", "Legal", "Insurance", _
            "Facilities", "Production"}

        ' Create a PieChart object of size 280 x 240 pixels
        Dim c As PieChart = New PieChart(280, 240)

        ' Set the center of the pie at (140, 130) and the radius to 80 pixels
        c.setPieSize(140, 130, 80)

        ' Add a title to the pie to show the start angle and direction
        If chartIndex = 0 Then
            c.addTitle("Start Angle = 0 degrees<*br*>Direction = Clockwise")
        Else
            c.addTitle("Start Angle = 90 degrees<*br*>Direction = AntiClockwise")
            c.setStartAngle(90, False)
        End If

        ' Draw the pie in 3D
        c.set3D()

        ' Set the pie data and the pie labels
        c.setData(data, labels)

        ' Explode the 1st sector (index = 0)
        c.setExplode(0)

        ' Output the chart
        viewer.Chart = c

        'include tool tip for the chart
        viewer.ImageMap = c.getHTMLImageMap("clickable", "", _
            "title='{label}: US${value}K ({percent}%)'")

    End Sub

End Class

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

namespace CSharpWPFDemo
{
    public class anglepie : DemoModule
    {
        //Name of demo module
        public string getName() { return "Start Angle and Direction"; }

        //Number of charts produced in this demo module
        public int getNoOfCharts() { return 2; }

        //Main code for creating charts
        public void createChart(WPFChartViewer viewer, int chartIndex)
        {
            // The data for the pie chart
            double[] data = {25, 18, 15, 12, 8, 30, 35};

            // The labels for the pie chart
            string[] labels = {"Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities",
                "Production"};

            // Create a PieChart object of size 280 x 240 pixels
            PieChart c = new PieChart(280, 240);

            // Set the center of the pie at (140, 130) and the radius to 80 pixels
            c.setPieSize(140, 130, 80);

            // Add a title to the pie to show the start angle and direction
            if (chartIndex == 0) {
                c.addTitle("Start Angle = 0 degrees\nDirection = Clockwise");
            } else {
                c.addTitle("Start Angle = 90 degrees\nDirection = AntiClockwise");
                c.setStartAngle(90, false);
            }

            // Draw the pie in 3D
            c.set3D();

            // Set the pie data and the pie labels
            c.setData(data, labels);

            // Explode the 1st sector (index = 0)
            c.setExplode(0);

            // Output the chart
            viewer.Chart = c;

            //include tool tip for the chart
            viewer.ImageMap = c.getHTMLImageMap("clickable", "",
                "title='{label}: US${value}K ({percent}%)'");
        }
    }
}

[ASP.NET Web Forms - C# version] NetWebCharts\CSharpASP\anglepie.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 data for the pie chart
    double[] data = {25, 18, 15, 12, 8, 30, 35};

    // The labels for the pie chart
    string[] labels = {"Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities",
        "Production"};

    // Create a PieChart object of size 280 x 240 pixels
    PieChart c = new PieChart(280, 240);

    // Set the center of the pie at (140, 130) and the radius to 80 pixels
    c.setPieSize(140, 130, 80);

    // Add a title to the pie to show the start angle and direction
    if (chartIndex == 0) {
        c.addTitle("Start Angle = 0 degrees\nDirection = Clockwise");
    } else {
        c.addTitle("Start Angle = 90 degrees\nDirection = AntiClockwise");
        c.setStartAngle(90, false);
    }

    // Draw the pie in 3D
    c.set3D();

    // Set the pie data and the pie labels
    c.setData(data, labels);

    // Explode the 1st sector (index = 0)
    c.setExplode(0);

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

    // Include tool tip for the chart
    viewer.ImageMap = c.getHTMLImageMap("", "", "title='{label}: US${value}K ({percent}%)'");
}

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

</script>

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

[ASP.NET Web Forms - VB Version] NetWebCharts\VBNetASP\anglepie.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 data for the pie chart
    Dim data() As Double = {25, 18, 15, 12, 8, 30, 35}

    ' The labels for the pie chart
    Dim labels() As String = {"Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities", _
        "Production"}

    ' Create a PieChart object of size 280 x 240 pixels
    Dim c As PieChart = New PieChart(280, 240)

    ' Set the center of the pie at (140, 130) and the radius to 80 pixels
    c.setPieSize(140, 130, 80)

    ' Add a title to the pie to show the start angle and direction
    If chartIndex = 0 Then
        c.addTitle("Start Angle = 0 degrees<*br*>Direction = Clockwise")
    Else
        c.addTitle("Start Angle = 90 degrees<*br*>Direction = AntiClockwise")
        c.setStartAngle(90, False)
    End If

    ' Draw the pie in 3D
    c.set3D()

    ' Set the pie data and the pie labels
    c.setData(data, labels)

    ' Explode the 1st sector (index = 0)
    c.setExplode(0)

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

    ' Include tool tip for the chart
    viewer.ImageMap = c.getHTMLImageMap("", "", "title='{label}: US${value}K ({percent}%)'")

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)

End Sub

</script>

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

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

namespace NetMvcCharts.Controllers
{
    public class AnglepieController : Controller
    {
        //
        // Default Action
        //
        public ActionResult Index()
        {
            ViewBag.Title = "Start Angle and Direction";

            // This example contains 2 charts.
            ViewBag.Viewer = new RazorChartViewer[2];
            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 data for the pie chart
            double[] data = {25, 18, 15, 12, 8, 30, 35};

            // The labels for the pie chart
            string[] labels = {"Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities",
                "Production"};

            // Create a PieChart object of size 280 x 240 pixels
            PieChart c = new PieChart(280, 240);

            // Set the center of the pie at (140, 130) and the radius to 80 pixels
            c.setPieSize(140, 130, 80);

            // Add a title to the pie to show the start angle and direction
            if (chartIndex == 0) {
                c.addTitle("Start Angle = 0 degrees\nDirection = Clockwise");
            } else {
                c.addTitle("Start Angle = 90 degrees\nDirection = AntiClockwise");
                c.setStartAngle(90, false);
            }

            // Draw the pie in 3D
            c.set3D();

            // Set the pie data and the pie labels
            c.setData(data, labels);

            // Explode the 1st sector (index = 0)
            c.setExplode(0);

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

            // Include tool tip for the chart
            viewer.ImageMap = c.getHTMLImageMap("", "", "title='{label}: US${value}K ({percent}%)'");
        }
    }
}

[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>