堆积样条面积图

堆积样条面积图 是由 StackedSplineAreaSeriesView 对象来表示的，此对象属于面积系列视图。这种视图类似于堆积面积图，但是绘制一条适当的穿过系列中每个数据点的曲线。

在下面的插图中显示了一个堆积样条面积图。注意，这种图表类型基于 XYDiagram，因此可以被旋转，从而垂直地或水平地显示图表。

注意
如果两个堆积面积包含了不同参数的数据点，那么不会把缺少参数的点作为零值点处理。堆积样条面积图可以显示包含正值或负值数据点的系列。但是，有正值的系列只能与其他包含正值的系列相堆积；有负值的系列与其他包含负值的系列相堆积。注意，如果系列同时包含正值和负值数据点，那么它被作为有正值的系列进行处理，而它的所有负值都被视为零。

注意

如果两个堆积面积包含了不同参数的数据点，那么不会把缺少参数的点作为零值点处理。

堆积样条面积图可以显示包含正值或负值数据点的系列。但是，有正值的系列只能与其他包含正值的系列相堆积；有负值的系列与其他包含负值的系列相堆积。

注意，如果系列同时包含正值和负值数据点，那么它被作为有正值的系列进行处理，而它的所有负值都被视为零。

下表列出了这种图表类型的主要特征。

特征	取值
系列视图类型	StackedSplineAreaSeriesView
图象类型	2D- XYDiagram
每个数据点的参数个数	1
每个数据点的取值个数	1

注意
要获得关于哪些图表类型可以与堆积样条面积图组合使用的信息，请参阅组合使用不同的系列视图文档。

下面的示例演示了在运行时刻如何创建 ChartControl (拥有一个 StackedSplineAreaSeriesView 类型的系列)，设置它的常规属性，并把图表添加到窗体中。在继续本示例之前，首先要在 Visual Studio 中创建一个 Windows 窗体应用程序，并把所有必需的程序集包含到项目的“引用”列表中。

然后，把下列代码添加到 Form.Load 事件处理程序。

C#	复制代码
using System; using System.Windows.Forms; using DevExpress.XtraCharts; // ... private void Form1_Load(object sender, EventArgs e) { // Create a new chart. ChartControl stackedSplineAreaChart = new ChartControl(); // Create two stacked spline area series. Series series1 = new Series("Series 1", ViewType.StackedSplineArea); Series series2 = new Series("Series 2", ViewType.StackedSplineArea); // Add points to them. series1.Points.Add(new SeriesPoint("A", 80)); series1.Points.Add(new SeriesPoint("B", 20)); series1.Points.Add(new SeriesPoint("C", 50)); series1.Points.Add(new SeriesPoint("D", 30)); series2.Points.Add(new SeriesPoint("A", 40)); series2.Points.Add(new SeriesPoint("B", 60)); series2.Points.Add(new SeriesPoint("C", 20)); series2.Points.Add(new SeriesPoint("D", 80)); // Add both series to the chart. stackedSplineAreaChart.Series.AddRange(new Series[] { series1, series2 }); // Adjust the view-type-specific options of the series. ((StackedSplineAreaSeriesView)series1.View).LineTensionPercent = 10; ((StackedSplineAreaSeriesView)series2.View).LineTensionPercent = 70; // Access the diagram's options. ((XYDiagram)stackedSplineAreaChart.Diagram).EnableAxisXZooming = true; // Hide the legend (if necessary). stackedSplineAreaChart.Legend.Visible = false; // Add a title to the chart (if necessary). stackedSplineAreaChart.Titles.Add(new ChartTitle()); stackedSplineAreaChart.Titles[0].Text = "A Stacked Spline Area Chart"; stackedSplineAreaChart.Titles[0].WordWrap = true; // Add the chart to the form. stackedSplineAreaChart.Dock = DockStyle.Fill; this.Controls.Add(stackedSplineAreaChart); }

C#

复制代码

using System;
using System.Windows.Forms;
using DevExpress.XtraCharts;
// ...

private void Form1_Load(object sender, EventArgs e) {
    // Create a new chart.
    ChartControl stackedSplineAreaChart = new ChartControl();

    // Create two stacked spline area series.
    Series series1 = new Series("Series 1", ViewType.StackedSplineArea);
    Series series2 = new Series("Series 2", ViewType.StackedSplineArea);

    // Add points to them.
    series1.Points.Add(new SeriesPoint("A", 80));
    series1.Points.Add(new SeriesPoint("B", 20));
    series1.Points.Add(new SeriesPoint("C", 50));
    series1.Points.Add(new SeriesPoint("D", 30));

    series2.Points.Add(new SeriesPoint("A", 40));
    series2.Points.Add(new SeriesPoint("B", 60));
    series2.Points.Add(new SeriesPoint("C", 20));
    series2.Points.Add(new SeriesPoint("D", 80));

    // Add both series to the chart.
    stackedSplineAreaChart.Series.AddRange(new Series[] { series1, series2 });

    // Adjust the view-type-specific options of the series.
    ((StackedSplineAreaSeriesView)series1.View).LineTensionPercent = 10;
    ((StackedSplineAreaSeriesView)series2.View).LineTensionPercent = 70;

    // Access the diagram's options.
    ((XYDiagram)stackedSplineAreaChart.Diagram).EnableAxisXZooming = true;

    // Hide the legend (if necessary).
    stackedSplineAreaChart.Legend.Visible = false;

    // Add a title to the chart (if necessary).
    stackedSplineAreaChart.Titles.Add(new ChartTitle());
    stackedSplineAreaChart.Titles[0].Text = "A Stacked Spline Area Chart";
    stackedSplineAreaChart.Titles[0].WordWrap = true;

    // Add the chart to the form.
    stackedSplineAreaChart.Dock = DockStyle.Fill;
    this.Controls.Add(stackedSplineAreaChart);
}

Visual Basic	复制代码
Imports System Imports System.Windows.Forms Imports DevExpress.XtraCharts ' ... Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) _ Handles MyBase.Load ' Create a new chart. Dim stackedSplineAreaChart As New ChartControl() ' Create two stacked spline area series. Dim series1 As New Series("Series 1", ViewType.StackedSplineArea) Dim series2 As New Series("Series 2", ViewType.StackedSplineArea) ' Add points to them. series1.Points.Add(New SeriesPoint("A", 80)) series1.Points.Add(New SeriesPoint("B", 20)) series1.Points.Add(New SeriesPoint("C", 50)) series1.Points.Add(New SeriesPoint("D", 30)) series2.Points.Add(New SeriesPoint("A", 40)) series2.Points.Add(New SeriesPoint("B", 60)) series2.Points.Add(New SeriesPoint("C", 20)) series2.Points.Add(New SeriesPoint("D", 80)) ' Add both series to the chart. stackedSplineAreaChart.Series.AddRange(New Series() { series1, series2 }) ' Adjust the view-type-specific options of the series. CType(series1.View, StackedSplineAreaSeriesView).LineTensionPercent = 10 CType(series2.View, StackedSplineAreaSeriesView).LineTensionPercent = 70 ' Access the diagram's options. CType(stackedSplineAreaChart.Diagram, XYDiagram).EnableAxisXZooming = True ' Hide the legend (if necessary). stackedSplineAreaChart.Legend.Visible = False ' Add a title to the chart (if necessary). stackedSplineAreaChart.Titles.Add(New ChartTitle()) stackedSplineAreaChart.Titles(0).Text = "A Stacked Spline Area Chart" stackedSplineAreaChart.Titles(0).WordWrap = True ' Add the chart to the form. stackedSplineAreaChart.Dock = DockStyle.Fill Me.Controls.Add(stackedSplineAreaChart) End Sub

Visual Basic

复制代码

Imports System
Imports System.Windows.Forms
Imports DevExpress.XtraCharts
' ...

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) _ 
Handles MyBase.Load
    ' Create a new chart.
    Dim stackedSplineAreaChart As New ChartControl()

    ' Create two stacked spline area series.
    Dim series1 As New Series("Series 1", ViewType.StackedSplineArea)
    Dim series2 As New Series("Series 2", ViewType.StackedSplineArea)

    ' Add points to them.
    series1.Points.Add(New SeriesPoint("A", 80))
    series1.Points.Add(New SeriesPoint("B", 20))
    series1.Points.Add(New SeriesPoint("C", 50))
    series1.Points.Add(New SeriesPoint("D", 30))

    series2.Points.Add(New SeriesPoint("A", 40))
    series2.Points.Add(New SeriesPoint("B", 60))
    series2.Points.Add(New SeriesPoint("C", 20))
    series2.Points.Add(New SeriesPoint("D", 80))

    ' Add both series to the chart.
    stackedSplineAreaChart.Series.AddRange(New Series() { series1, series2 })

    ' Adjust the view-type-specific options of the series.
    CType(series1.View, StackedSplineAreaSeriesView).LineTensionPercent = 10
    CType(series2.View, StackedSplineAreaSeriesView).LineTensionPercent = 70

    ' Access the diagram's options.
    CType(stackedSplineAreaChart.Diagram, XYDiagram).EnableAxisXZooming = True

    ' Hide the legend (if necessary).
    stackedSplineAreaChart.Legend.Visible = False

    ' Add a title to the chart (if necessary).
    stackedSplineAreaChart.Titles.Add(New ChartTitle())
    stackedSplineAreaChart.Titles(0).Text = "A Stacked Spline Area Chart"
    stackedSplineAreaChart.Titles(0).WordWrap = True

    ' Add the chart to the form.
    stackedSplineAreaChart.Dock = DockStyle.Fill
    Me.Controls.Add(stackedSplineAreaChart)
End Sub

Show Me
在 DevExpress Code Central 数据库中可以找到完整的示例项目，网址是 http://www.devexpress.com/example=E1051。取决于目标平台类型 (ASP.NET、WinForms 等)，可以在线运行本示例，或者下载自动可执行的示例。

XY-图象

简要说明

图表类型特征

示例

参阅