ActualScaleType Enum
Lists scale types for series point arguments and values.
Namespace: DevExpress.XtraCharts
Assembly: DevExpress.XtraCharts.v24.2.dll
NuGet Package: DevExpress.Charts
#Declaration
[ResourceFinder(typeof(XtraChartsResFinder), "PropertyNamesRes")]
public enum ActualScaleType
#Members
Name | Description |
---|---|
Qualitative
|
Identifies the qualitative data scale. This means that data used to create series points is treated as string categories and shown on the axis as string values (for example, A, B, C). This scale type is only available for arguments. Use the Axis |
Numerical
|
Identifies the numeric data scale. This means that data used to create series points is treated as numeric values and shown on the axis as numbers (for example, 100 or 0. |
Date
|
Identifies the Date |
Time
|
Identifies the Time |
#Example
#How to: Implement a Custom Chart Data Adapter
This example shows how to create an adapter that loads numeric data to the chart:
using DevExpress.XtraCharts;
using System;
using System.Collections.Generic;
using System.Windows.Forms;
namespace CustomDataAdapter {
public partial class Form1 : Form {
const long DataItemCount = 100000;
const int MaxValue = 100;
const int MinValue = 80;
Random rand = new Random();
public Form1() {
InitializeComponent();
Series series = new Series("Series", ViewType.Line);
chartControl1.Series.Add(series);
List<DataItem> dataItems = new List<DataItem>();
for (int i = 0; i < DataItemCount; i++) {
dataItems.Add(new DataItem(i, rand.NextDouble() * (MaxValue - MinValue) + MaxValue));
}
series.DataAdapter = new CustomNumericDataAdapter(dataItems);
((XYDiagram)chartControl1.Diagram).AxisY.WholeRange.AlwaysShowZeroLevel = false;
}
}
public class DataItem {
public double Argument { get; }
public double Value { get; }
public DataItem(double argument, double value) {
Argument = argument;
Value = value;
}
}
public class CustomNumericDataAdapter : ISeriesAdapter {
readonly IList<DataItem> items;
public bool DataSorted => true;
public int ItemsCount => this.items.Count;
public CustomNumericDataAdapter(IList<DataItem> items) {
this.items = items;
}
event NotifyChartDataChangedEventHandler IChartDataAdapter.DataChanged {
add { }
remove { }
}
public object Clone() {
return this;
}
public double GetNumericalValue(int index, ChartDataMemberType dataMember) {
switch (dataMember) {
case ChartDataMemberType.Argument: return items[index].Argument;
case ChartDataMemberType.Value: return items[index].Value;
}
return double.NaN;
}
public object GetSourceObject(int index) {
return this.items[index];
}
public ActualScaleType GetScaleType(ChartDataMemberType dataMember) {
return ActualScaleType.Numerical;
}
public DateTime GetDateTimeValue(int index, ChartDataMemberType dataMember) {
throw new NotImplementedException();
}
public string GetQualitativeValue(int index, ChartDataMemberType dataMember) {
throw new NotImplementedException();
}
public TimeSpan GetTimeSpanValue(int index, ChartDataMemberType dataMember) {
throw new NotImplementedException();
}
public object GetObjectValue(int index, ChartDataMemberType dataMember) {
throw new NotImplementedException();
}
}
}