這個例子演示了各種方法來表現缺失的數據點，這也表明在繪圖區的ChartDirector會自動調整大小以適合圖表。如下圖所示：

在ChartDirector中，一系列的數據可能會存在丟失的情況，多使用NoValue來預定義常量。在一個線層里，在默認的情況下面，缺失值表示在該行的差距。換句話說，就是該線路將被打斷。LineLayer.setGapColor被用來配置的線層加入通過NoValue點，使用的線段可以是具有不同的顏色或風格。

這個例子中，三個數據系列都包含NoValue點。紅線表示了使用差距的默認行為來表現NoValue點。綠線演示了如何使用虛線加入通過NoValue點。橙色線表明使用具有相同的線條樣式來參加正常的數據點加入通過NoValue點。

在整個圖表配置完成之后呢，XYChart.packPlotArea方法將會被用來適應在給定的邊界框力的小區面積和軸。

 所使用的源代碼如下：

[ASP.NET - VB Version]

<%@ Page Language="VB" Debug="true" %>
<%@ Import Namespace="ChartDirector" %>
<%@ Register TagPrefix="chart" Namespace="ChartDirector" Assembly="netchartdir" %>
<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 = {42, 49, Chart.NoValue, 38, 64, 56, 29, 41, 44, 57}
    Dim data1() As Double = {65, 75, 47, 34, 42, 49, 73, Chart.NoValue, 90, 69, 66, _
        78}
    Dim data2() As Double = {Chart.NoValue, Chart.NoValue, 25, 28, 38, 20, 22, _
        Chart.NoValue, 25, 33, 30, 24}
    Dim labels() As String = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", _
        "Aug", "Sep", "Oct", "Nov", "Dec"}

    ' Create a XYChart object of size 600 x 360 pixels. Set background color to
    ' brushed silver, with a 2 pixel 3D border. Use rounded corners.
    Dim c As XYChart = New XYChart(600, 360, Chart.brushedSilverColor(), _
        Chart.Transparent, 2)
    c.setRoundedFrame()

    ' Add a title using 18 pts Times New Roman Bold Italic font. #Set top/bottom
    ' margins to 6 pixels.
    Dim title As ChartDirector.TextBox = c.addTitle("Product Line Global Revenue", _
        "Times New Roman Bold Italic", 18)
    title.setMargin2(0, 0, 6, 6)

    ' Add a separator line just under the title
    c.addLine(10, title.getHeight(), c.getWidth() - 11, title.getHeight(), _
        Chart.LineColor)

    ' Add a legend box where the top-center is anchored to the horizontal center of
    ' the chart, just under the title. Use horizontal layout and 10 points Arial Bold
    ' font, and transparent background and border.
    Dim legendBox As LegendBox = c.addLegend(c.getWidth() / 2, title.getHeight(), _
        False, "Arial Bold", 10)
    legendBox.setAlignment(Chart.TopCenter)
    legendBox.setBackground(Chart.Transparent, Chart.Transparent)

    ' Tentatively set the plotarea at (70, 75) and of 460 x 240 pixels in size. Use
    ' transparent border and black (000000) grid lines
    c.setPlotArea(70, 75, 460, 240, -1, -1, Chart.Transparent, &H000000, -1)

    ' Set the x axis labels
    c.xAxis().setLabels(labels)

    ' Show the same scale on the left and right y-axes
    c.syncYAxis()

    ' Set y-axis tick density to 30 pixels. ChartDirector auto-scaling will use this
    ' as the guideline when putting ticks on the y-axis.
    c.yAxis().setTickDensity(30)

    ' Set all axes to transparent
    c.xAxis().setColors(Chart.Transparent)
    c.yAxis().setColors(Chart.Transparent)
    c.yAxis2().setColors(Chart.Transparent)

    ' Set the x-axis margins to 15 pixels, so that the horizontal grid lines can
    ' extend beyond the leftmost and rightmost vertical grid lines
    c.xAxis().setMargin(15, 15)

    ' Set axis label style to 8pts Arial Bold
    c.xAxis().setLabelStyle("Arial Bold", 8)
    c.yAxis().setLabelStyle("Arial Bold", 8)
    c.yAxis2().setLabelStyle("Arial Bold", 8)

    ' Add axis title using 10pts Arial Bold Italic font
    c.yAxis().setTitle("Revenue in USD millions", "Arial Bold Italic", 10)
    c.yAxis2().setTitle("Revenue in USD millions", "Arial Bold Italic", 10)

    ' Add the first line. The missing data will be represented as gaps in the line
    ' (the default behaviour)
    Dim layer0 As LineLayer = c.addLineLayer2()
    layer0.addDataSet(data0, &Hff0000, "Quantum Computer").setDataSymbol( _
        Chart.GlassSphere2Shape, 11)
    layer0.setLineWidth(3)

    ' Add the second line. The missing data will be represented by using dash lines
    ' to bridge the gap
    Dim layer1 As LineLayer = c.addLineLayer2()
    layer1.addDataSet(data1, &H00ff00, "Atom Synthesizer").setDataSymbol( _
        Chart.GlassSphere2Shape, 11)
    layer1.setLineWidth(3)
    layer1.setGapColor(c.dashLineColor(&H00ff00))

    ' Add the third line. The missing data will be ignored - just join the gap with
    ' the original line style.
    Dim layer2 As LineLayer = c.addLineLayer2()
    layer2.addDataSet(data2, &Hff6600, "Proton Cannon").setDataSymbol( _
        Chart.GlassSphere2Shape, 11)
    layer2.setLineWidth(3)
    layer2.setGapColor(Chart.SameAsMainColor)

    ' layout the legend so we can get the height of the legend box
    c.layoutLegend()

    ' Adjust the plot area size, such that the bounding box (inclusive of axes) is 15
    ' pixels from the left edge, just under the legend box, 16 pixels from the right
    ' edge, and 25 pixels from the bottom edge.
    c.packPlotArea(15, legendBox.getTopY() + legendBox.getHeight(), c.getWidth() - _
        16, c.getHeight() - 25)

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

    ' Include tool tip for the chart
    WebChartViewer1.ImageMap = c.getHTMLImageMap("", "", _
        "title='Revenue of {dataSetName} in {xLabel}: US$ {value}M'")

End Sub

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

[ASP.NET - C# Version]

<%@ Page Language="C#" Debug="true" %>
<%@ Import Namespace="ChartDirector" %>
<%@ Register TagPrefix="chart" Namespace="ChartDirector" Assembly="netchartdir" %>
<script runat="server">

//
// Page Load event handler
//
protected void Page_Load(object sender, EventArgs e)
{
    // The data for the chart
    double[] data0 = {42, 49, Chart.NoValue, 38, 64, 56, 29, 41, 44, 57};
    double[] data1 = {65, 75, 47, 34, 42, 49, 73, Chart.NoValue, 90, 69, 66, 78};
    double[] data2 = {Chart.NoValue, Chart.NoValue, 25, 28, 38, 20, 22,
        Chart.NoValue, 25, 33, 30, 24};
    string[] labels = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
        "Oct", "Nov", "Dec"};

    // Create a XYChart object of size 600 x 360 pixels. Set background color to
    // brushed silver, with a 2 pixel 3D border. Use rounded corners.
    XYChart c = new XYChart(600, 360, Chart.brushedSilverColor(), Chart.Transparent,
        2);
    c.setRoundedFrame();

    // Add a title using 18 pts Times New Roman Bold Italic font. #Set top/bottom
    // margins to 6 pixels.
    ChartDirector.TextBox title = c.addTitle("Product Line Global Revenue",
        "Times New Roman Bold Italic", 18);
    title.setMargin2(0, 0, 6, 6);

    // Add a separator line just under the title
    c.addLine(10, title.getHeight(), c.getWidth() - 11, title.getHeight(),
        Chart.LineColor);

    // Add a legend box where the top-center is anchored to the horizontal center of
    // the chart, just under the title. Use horizontal layout and 10 points Arial
    // Bold font, and transparent background and border.
    LegendBox legendBox = c.addLegend(c.getWidth() / 2, title.getHeight(), false,
        "Arial Bold", 10);
    legendBox.setAlignment(Chart.TopCenter);
    legendBox.setBackground(Chart.Transparent, Chart.Transparent);

    // Tentatively set the plotarea at (70, 75) and of 460 x 240 pixels in size. Use
    // transparent border and black (000000) grid lines
    c.setPlotArea(70, 75, 460, 240, -1, -1, Chart.Transparent, 0x000000, -1);

    // Set the x axis labels
    c.xAxis().setLabels(labels);

    // Show the same scale on the left and right y-axes
    c.syncYAxis();

    // Set y-axis tick density to 30 pixels. ChartDirector auto-scaling will use this
    // as the guideline when putting ticks on the y-axis.
    c.yAxis().setTickDensity(30);

    // Set all axes to transparent
    c.xAxis().setColors(Chart.Transparent);
    c.yAxis().setColors(Chart.Transparent);
    c.yAxis2().setColors(Chart.Transparent);

    // Set the x-axis margins to 15 pixels, so that the horizontal grid lines can
    // extend beyond the leftmost and rightmost vertical grid lines
    c.xAxis().setMargin(15, 15);

    // Set axis label style to 8pts Arial Bold
    c.xAxis().setLabelStyle("Arial Bold", 8);
    c.yAxis().setLabelStyle("Arial Bold", 8);
    c.yAxis2().setLabelStyle("Arial Bold", 8);

    // Add axis title using 10pts Arial Bold Italic font
    c.yAxis().setTitle("Revenue in USD millions", "Arial Bold Italic", 10);
    c.yAxis2().setTitle("Revenue in USD millions", "Arial Bold Italic", 10);

    // Add the first line. The missing data will be represented as gaps in the line
    // (the default behaviour)
    LineLayer layer0 = c.addLineLayer2();
    layer0.addDataSet(data0, 0xff0000, "Quantum Computer").setDataSymbol(
        Chart.GlassSphere2Shape, 11);
    layer0.setLineWidth(3);

    // Add the second line. The missing data will be represented by using dash lines
    // to bridge the gap
    LineLayer layer1 = c.addLineLayer2();
    layer1.addDataSet(data1, 0x00ff00, "Atom Synthesizer").setDataSymbol(
        Chart.GlassSphere2Shape, 11);
    layer1.setLineWidth(3);
    layer1.setGapColor(c.dashLineColor(0x00ff00));

    // Add the third line. The missing data will be ignored - just join the gap with
    // the original line style.
    LineLayer layer2 = c.addLineLayer2();
    layer2.addDataSet(data2, 0xff6600, "Proton Cannon").setDataSymbol(
        Chart.GlassSphere2Shape, 11);
    layer2.setLineWidth(3);
    layer2.setGapColor(Chart.SameAsMainColor);

    // layout the legend so we can get the height of the legend box
    c.layoutLegend();

    // Adjust the plot area size, such that the bounding box (inclusive of axes) is
    // 15 pixels from the left edge, just under the legend box, 16 pixels from the
    // right edge, and 25 pixels from the bottom edge.
    c.packPlotArea(15, legendBox.getTopY() + legendBox.getHeight(), c.getWidth() -
        16, c.getHeight() - 25);

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

    // Include tool tip for the chart
    WebChartViewer1.ImageMap = c.getHTMLImageMap("", "",
        "title='Revenue of {dataSetName} in {xLabel}: US$ {value}M'");
}

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

[Windows Forms - VB Version]

Imports System
Imports Microsoft.VisualBasic
Imports ChartDirector

Public Class missingpoints
    Implements DemoModule

    'Name of demo module
    Public Function getName() As String Implements DemoModule.getName
        Return "Missing Data Points"
    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 img is unused because this demo only has 1 chart.
    Public Sub createChart(viewer As WinChartViewer, img As String) _
        Implements DemoModule.createChart

        ' The data for the chart
        Dim data0() As Double = {42, 49, Chart.NoValue, 38, 64, 56, 29, 41, 44, 57}
        Dim data1() As Double = {65, 75, 47, 34, 42, 49, 73, Chart.NoValue, 90, 69, _
            66, 78}
        Dim data2() As Double = {Chart.NoValue, Chart.NoValue, 25, 28, 38, 20, 22, _
            Chart.NoValue, 25, 33, 30, 24}
        Dim labels() As String = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", _
            "Aug", "Sep", "Oct", "Nov", "Dec"}

        ' Create a XYChart object of size 600 x 360 pixels. Set background color to
        ' brushed silver, with a 2 pixel 3D border. Use rounded corners.
        Dim c As XYChart = New XYChart(600, 360, Chart.brushedSilverColor(), _
            Chart.Transparent, 2)
        c.setRoundedFrame()

        ' Add a title using 18 pts Times New Roman Bold Italic font. #Set top/bottom
        ' margins to 6 pixels.
        Dim title As ChartDirector.TextBox = c.addTitle( _
            "Product Line Global Revenue", "Times New Roman Bold Italic", 18)
        title.setMargin2(0, 0, 6, 6)

        ' Add a separator line just under the title
        c.addLine(10, title.getHeight(), c.getWidth() - 11, title.getHeight(), _
            Chart.LineColor)

        ' Add a legend box where the top-center is anchored to the horizontal center
        ' of the chart, just under the title. Use horizontal layout and 10 points
        ' Arial Bold font, and transparent background and border.
        Dim legendBox As LegendBox = c.addLegend(c.getWidth() / 2, title.getHeight( _
            ), False, "Arial Bold", 10)
        legendBox.setAlignment(Chart.TopCenter)
        legendBox.setBackground(Chart.Transparent, Chart.Transparent)

        ' Tentatively set the plotarea at (70, 75) and of 460 x 240 pixels in size.
        ' Use transparent border and black (000000) grid lines
        c.setPlotArea(70, 75, 460, 240, -1, -1, Chart.Transparent, &H000000, -1)

        ' Set the x axis labels
        c.xAxis().setLabels(labels)

        ' Show the same scale on the left and right y-axes
        c.syncYAxis()

        ' Set y-axis tick density to 30 pixels. ChartDirector auto-scaling will use
        ' this as the guideline when putting ticks on the y-axis.
        c.yAxis().setTickDensity(30)

        ' Set all axes to transparent
        c.xAxis().setColors(Chart.Transparent)
        c.yAxis().setColors(Chart.Transparent)
        c.yAxis2().setColors(Chart.Transparent)

        ' Set the x-axis margins to 15 pixels, so that the horizontal grid lines can
        ' extend beyond the leftmost and rightmost vertical grid lines
        c.xAxis().setMargin(15, 15)

        ' Set axis label style to 8pts Arial Bold
        c.xAxis().setLabelStyle("Arial Bold", 8)
        c.yAxis().setLabelStyle("Arial Bold", 8)
        c.yAxis2().setLabelStyle("Arial Bold", 8)

        ' Add axis title using 10pts Arial Bold Italic font
        c.yAxis().setTitle("Revenue in USD millions", "Arial Bold Italic", 10)
        c.yAxis2().setTitle("Revenue in USD millions", "Arial Bold Italic", 10)

        ' Add the first line. The missing data will be represented as gaps in the
        ' line (the default behaviour)
        Dim layer0 As LineLayer = c.addLineLayer2()
        layer0.addDataSet(data0, &Hff0000, "Quantum Computer").setDataSymbol( _
            Chart.GlassSphere2Shape, 11)
        layer0.setLineWidth(3)

        ' Add the second line. The missing data will be represented by using dash
        ' lines to bridge the gap
        Dim layer1 As LineLayer = c.addLineLayer2()
        layer1.addDataSet(data1, &H00ff00, "Atom Synthesizer").setDataSymbol( _
            Chart.GlassSphere2Shape, 11)
        layer1.setLineWidth(3)
        layer1.setGapColor(c.dashLineColor(&H00ff00))

        ' Add the third line. The missing data will be ignored - just join the gap
        ' with the original line style.
        Dim layer2 As LineLayer = c.addLineLayer2()
        layer2.addDataSet(data2, &Hff6600, "Proton Cannon").setDataSymbol( _
            Chart.GlassSphere2Shape, 11)
        layer2.setLineWidth(3)
        layer2.setGapColor(Chart.SameAsMainColor)

        ' layout the legend so we can get the height of the legend box
        c.layoutLegend()

        ' Adjust the plot area size, such that the bounding box (inclusive of axes)
        ' is 15 pixels from the left edge, just under the legend box, 16 pixels from
        ' the right edge, and 25 pixels from the bottom edge.
        c.packPlotArea(15, legendBox.getTopY() + legendBox.getHeight(), c.getWidth( _
            ) - 16, c.getHeight() - 25)

        ' Output the chart
        viewer.Chart = c

        'include tool tip for the chart
        viewer.ImageMap = c.getHTMLImageMap("clickable", "", _
            "title='Revenue of {dataSetName} in {xLabel}: US$ {value}M'")

    End Sub

End Class

[Windows Forms - C# Version]

using System;
using ChartDirector;

namespace CSharpChartExplorer
{
    public class missingpoints : DemoModule
    {
        //Name of demo module
        public string getName() { return "Missing Data Points"; }

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

        //Main code for creating chart.
        //Note: the argument img is unused because this demo only has 1 chart.
        public void createChart(WinChartViewer viewer, string img)
        {
            // The data for the chart
            double[] data0 = {42, 49, Chart.NoValue, 38, 64, 56, 29, 41, 44, 57};
            double[] data1 = {65, 75, 47, 34, 42, 49, 73, Chart.NoValue, 90, 69, 66,
                78};
            double[] data2 = {Chart.NoValue, Chart.NoValue, 25, 28, 38, 20, 22,
                Chart.NoValue, 25, 33, 30, 24};
            string[] labels = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
                "Aug", "Sep", "Oct", "Nov", "Dec"};

            // Create a XYChart object of size 600 x 360 pixels. Set background color
            // to brushed silver, with a 2 pixel 3D border. Use rounded corners.
            XYChart c = new XYChart(600, 360, Chart.brushedSilverColor(),
                Chart.Transparent, 2);
            c.setRoundedFrame();

            // Add a title using 18 pts Times New Roman Bold Italic font. #Set
            // top/bottom margins to 6 pixels.
            ChartDirector.TextBox title = c.addTitle("Product Line Global Revenue",
                "Times New Roman Bold Italic", 18);
            title.setMargin2(0, 0, 6, 6);

            // Add a separator line just under the title
            c.addLine(10, title.getHeight(), c.getWidth() - 11, title.getHeight(),
                Chart.LineColor);

            // Add a legend box where the top-center is anchored to the horizontal
            // center of the chart, just under the title. Use horizontal layout and
            // 10 points Arial Bold font, and transparent background and border.
            LegendBox legendBox = c.addLegend(c.getWidth() / 2, title.getHeight(),
                false, "Arial Bold", 10);
            legendBox.setAlignment(Chart.TopCenter);
            legendBox.setBackground(Chart.Transparent, Chart.Transparent);

            // Tentatively set the plotarea at (70, 75) and of 460 x 240 pixels in
            // size. Use transparent border and black (000000) grid lines
            c.setPlotArea(70, 75, 460, 240, -1, -1, Chart.Transparent, 0x000000, -1);

            // Set the x axis labels
            c.xAxis().setLabels(labels);

            // Show the same scale on the left and right y-axes
            c.syncYAxis();

            // Set y-axis tick density to 30 pixels. ChartDirector auto-scaling will
            // use this as the guideline when putting ticks on the y-axis.
            c.yAxis().setTickDensity(30);

            // Set all axes to transparent
            c.xAxis().setColors(Chart.Transparent);
            c.yAxis().setColors(Chart.Transparent);
            c.yAxis2().setColors(Chart.Transparent);

            // Set the x-axis margins to 15 pixels, so that the horizontal grid lines
            // can extend beyond the leftmost and rightmost vertical grid lines
            c.xAxis().setMargin(15, 15);

            // Set axis label style to 8pts Arial Bold
            c.xAxis().setLabelStyle("Arial Bold", 8);
            c.yAxis().setLabelStyle("Arial Bold", 8);
            c.yAxis2().setLabelStyle("Arial Bold", 8);

            // Add axis title using 10pts Arial Bold Italic font
            c.yAxis().setTitle("Revenue in USD millions", "Arial Bold Italic", 10);
            c.yAxis2().setTitle("Revenue in USD millions", "Arial Bold Italic", 10);

            // Add the first line. The missing data will be represented as gaps in
            // the line (the default behaviour)
            LineLayer layer0 = c.addLineLayer2();
            layer0.addDataSet(data0, 0xff0000, "Quantum Computer").setDataSymbol(
                Chart.GlassSphere2Shape, 11);
            layer0.setLineWidth(3);

            // Add the second line. The missing data will be represented by using
            // dash lines to bridge the gap
            LineLayer layer1 = c.addLineLayer2();
            layer1.addDataSet(data1, 0x00ff00, "Atom Synthesizer").setDataSymbol(
                Chart.GlassSphere2Shape, 11);
            layer1.setLineWidth(3);
            layer1.setGapColor(c.dashLineColor(0x00ff00));

            // Add the third line. The missing data will be ignored - just join the
            // gap with the original line style.
            LineLayer layer2 = c.addLineLayer2();
            layer2.addDataSet(data2, 0xff6600, "Proton Cannon").setDataSymbol(
                Chart.GlassSphere2Shape, 11);
            layer2.setLineWidth(3);
            layer2.setGapColor(Chart.SameAsMainColor);

            // layout the legend so we can get the height of the legend box
            c.layoutLegend();

            // Adjust the plot area size, such that the bounding box (inclusive of
            // axes) is 15 pixels from the left edge, just under the legend box, 16
            // pixels from the right edge, and 25 pixels from the bottom edge.
            c.packPlotArea(15, legendBox.getTopY() + legendBox.getHeight(),
                c.getWidth() - 16, c.getHeight() - 25);

            // Output the chart
            viewer.Chart = c;

            //include tool tip for the chart
            viewer.ImageMap = c.getHTMLImageMap("clickable", "",
                "title='Revenue of {dataSetName} in {xLabel}: US$ {value}M'");
        }
    }
}