样条图

样条图 是由 SplineSeriesView 对象来表示的，此对象属于点、折线和样条系列视图。这种视图类似于折线图，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样条图。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。

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	SplineSeriesView
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样条图组合使用的信息，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 SplineSeriesView 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 splineChart = new ChartControl(); // Create a spline series. Series series1 = new Series("Series 1", ViewType.Spline); // Add points to it. series1.Points.Add(new SeriesPoint(1, 3)); series1.Points.Add(new SeriesPoint(2, 12)); series1.Points.Add(new SeriesPoint(3, 4)); series1.Points.Add(new SeriesPoint(4, 17)); series1.Points.Add(new SeriesPoint(5, 3)); series1.Points.Add(new SeriesPoint(6, 12)); series1.Points.Add(new SeriesPoint(7, 4)); series1.Points.Add(new SeriesPoint(8, 17)); // Add the series to the chart. splineChart.Series.Add(series1); // Set the numerical argument scale types for the series, // as it is qualitative, by default. series1.ArgumentScaleType = ScaleType.Numerical; // Access the view-type-specific options of the series. ((SplineSeriesView)series1.View).LineTensionPercent = 90; // Access the type-specific options of the diagram. ((XYDiagram)splineChart.Diagram).EnableAxisXZooming = true; // Hide the legend (if necessary). splineChart.Legend.Visible = false; // Add a title to the chart (if necessary). splineChart.Titles.Add(new ChartTitle()); splineChart.Titles[0].Text = "A Spline Chart"; // Add the chart to the form. splineChart.Dock = DockStyle.Fill; this.Controls.Add(splineChart); }

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 splineChart = new ChartControl();

    // Create a spline series.
    Series series1 = new Series("Series 1", ViewType.Spline);

    // Add points to it.
    series1.Points.Add(new SeriesPoint(1, 3));
    series1.Points.Add(new SeriesPoint(2, 12));
    series1.Points.Add(new SeriesPoint(3, 4));
    series1.Points.Add(new SeriesPoint(4, 17));
    series1.Points.Add(new SeriesPoint(5, 3));
    series1.Points.Add(new SeriesPoint(6, 12));
    series1.Points.Add(new SeriesPoint(7, 4));
    series1.Points.Add(new SeriesPoint(8, 17));

    // Add the series to the chart.
    splineChart.Series.Add(series1);

    // Set the numerical argument scale types for the series,
    // as it is qualitative, by default.
    series1.ArgumentScaleType = ScaleType.Numerical;

    // Access the view-type-specific options of the series.
    ((SplineSeriesView)series1.View).LineTensionPercent = 90;

    // Access the type-specific options of the diagram.
    ((XYDiagram)splineChart.Diagram).EnableAxisXZooming = true;

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

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

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

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 splineChart As New ChartControl() ' Create a spline series. Dim series1 As New Series("Series 1", ViewType.Spline) ' Add points to it. series1.Points.Add(New SeriesPoint(1, 3)) series1.Points.Add(New SeriesPoint(2, 12)) series1.Points.Add(New SeriesPoint(3, 4)) series1.Points.Add(New SeriesPoint(4, 17)) series1.Points.Add(New SeriesPoint(5, 3)) series1.Points.Add(New SeriesPoint(6, 12)) series1.Points.Add(New SeriesPoint(7, 4)) series1.Points.Add(New SeriesPoint(8, 17)) ' Add the series to the chart. splineChart.Series.Add(series1) ' Set the numerical argument scale types for the series, ' as it is qualitative, by default. series1.ArgumentScaleType = ScaleType.Numerical ' Access the view-type-specific options of the series. CType(series1.View, SplineSeriesView).LineTensionPercent = 90 ' Access the type-specific options of the diagram. CType(splineChart.Diagram, XYDiagram).EnableAxisXZooming = True ' Hide the legend (if necessary). splineChart.Legend.Visible = False ' Add a title to the chart (if necessary). splineChart.Titles.Add(New ChartTitle()) splineChart.Titles(0).Text = "A Spline Chart" ' Add the chart to the form. splineChart.Dock = DockStyle.Fill Me.Controls.Add(splineChart) 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 splineChart As New ChartControl()

    ' Create a spline series.
    Dim series1 As New Series("Series 1", ViewType.Spline)

    ' Add points to it.
    series1.Points.Add(New SeriesPoint(1, 3))
    series1.Points.Add(New SeriesPoint(2, 12))
    series1.Points.Add(New SeriesPoint(3, 4))
    series1.Points.Add(New SeriesPoint(4, 17))
    series1.Points.Add(New SeriesPoint(5, 3))
    series1.Points.Add(New SeriesPoint(6, 12))
    series1.Points.Add(New SeriesPoint(7, 4))
    series1.Points.Add(New SeriesPoint(8, 17))

    ' Add the series to the chart.
    splineChart.Series.Add(series1)

    ' Set the numerical argument scale types for the series,
    ' as it is qualitative, by default.
    series1.ArgumentScaleType = ScaleType.Numerical

    ' Access the view-type-specific options of the series.
    CType(series1.View, SplineSeriesView).LineTensionPercent = 90

    ' Access the type-specific options of the diagram.
    CType(splineChart.Diagram, XYDiagram).EnableAxisXZooming = True

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

    ' Add a title to the chart (if necessary).
    splineChart.Titles.Add(New ChartTitle())
    splineChart.Titles(0).Text = "A Spline Chart"

    ' Add the chart to the form.
    splineChart.Dock = DockStyle.Fill
    Me.Controls.Add(splineChart)
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=E1048。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