WPF编程，Live Charts使用说明（47）——对数轴

LiveCharts映射器使此操作变得容易，所有您需要做的就是在映射器中配置比例，就像通常配置其他任何图表一样。

后台：

using System;
using System.Windows.Controls;
using LiveCharts;
using LiveCharts.Configurations;
using LiveCharts.Defaults;
using LiveCharts.Wpf;
 
namespace Wpf.CartesianChart.LogarithmScale
{
    public partial class LogarithmScaleExample : UserControl
    {
        public LogarithmScaleExample()
        {
            InitializeComponent();
 
            Base = 10;
 
            var mapper = Mappers.Xy<ObservablePoint>()
                .X(point => Math.Log(point.X, Base)) //a 10 base log scale in the X axis
                .Y(point => point.Y);
 
            SeriesCollection =  new SeriesCollection(mapper)
            {
                new LineSeries
                {
                    Values = new ChartValues<ObservablePoint>
                    {
                        new ObservablePoint(1, 5),
                        new ObservablePoint(10, 6),
                        new ObservablePoint(100, 4),
                        new ObservablePoint(1000, 2),
                        new ObservablePoint(10000, 8),
                        new ObservablePoint(100000, 2),
                        new ObservablePoint(1000000, 9),
                        new ObservablePoint(10000000, 8)
                    }
                }
            };
 
            Formatter = value => Math.Pow(Base, value).ToString("N");
 
            DataContext = this;
        }
 
        public SeriesCollection SeriesCollection { get; set; }
        public Func<double, string> Formatter { get; set; }
        public double Base { get; set; }
 
    }
}

前台：

<UserControl x:Class="Wpf.CartesianChart.LogarithmScale.LogarithmScaleExample"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Wpf.CartesianChart.LogarithmScale"
             xmlns:lvc="clr-namespace:LiveCharts.Wpf;assembly=LiveCharts.Wpf"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <lvc:CartesianChart Series="{Binding SeriesCollection}">
            <lvc:CartesianChart.Resources>
                <Style TargetType="lvc:Separator">
                    <Setter Property="Stroke" Value="LightGray"></Setter>
                </Style>
            </lvc:CartesianChart.Resources>
            <lvc:CartesianChart.AxisX>
                <lvc:LogarithmicAxis LabelFormatter="{Binding Formatter}" 
                                     Base="{Binding Base}" >
                    <lvc:LogarithmicAxis.Separator>
                        <lvc:Separator StrokeThickness="1" IsEnabled="True"></lvc:Separator>
                    </lvc:LogarithmicAxis.Separator>
                </lvc:LogarithmicAxis>
            </lvc:CartesianChart.AxisX>
        </lvc:CartesianChart>
    </Grid>
</UserControl>