WPF Charts (Part 2)

Chart2

I have been quite busy in the last weeks, I will resume blogging on a regular basis again.

Today, we are enhancing the previous chart Part1 with some new features:

  • One curve has circles around all points. These become transparent when you hover over them.
    I chose a pretty large size to make them more obvious.
  • The shared X-Axis text labels are rotated by 90 degrees. Feel free to test other angles like 45 degrees.
  • A three second interval timer appends new points to the chart.
  • A text field shows the object types while the mouse hovers over the chart elements. This is the entry point to examine chart objects, find positions and generate on the fly ToolTips.

Some code was commented out. Play with these code pieces. You can change the following behavior:

  • Hide the legend by setting its width to zero.
  • Add a non-shard Axis.
  • Change the color to blue rather transparent when hovering over a point.
  • Besides the above, play with the code as much as you like – especially the XAML part.

In this example I used the .NET ReadOnlyObservableCollection. This collection is a wrapper around the well known ObservableCollection. The readonly collection cannot be changed (if there was any chart element to eg. cut a point out). But you can access the wrapped read/write ObservableCollection. This is a nice approach. For the outer world you have an encapsulated object. From behind the curtain you still have full access. The chart automatically updates when a new point is added to the read/write ObservableCollection.

Once again the code is pretty much self explanatory. So I am not adding a long post text.

 

<Window x:Class="Demo.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:Demo"
    xmlns:datavisualization="clr-namespace:System.Windows.Controls.DataVisualization;assembly=System.Windows.Controls.DataVisualization.Toolkit"
    xmlns:chart="clr-namespace:System.Windows.Controls.DataVisualization.Charting;assembly=System.Windows.Controls.DataVisualization.Toolkit"
    Title="Demo Window"
    Loaded ="Window_Loaded">

    <Grid>
        <TextBox Name="InfoBox" Text="" Height="Auto"/>
        <chart:Chart Name="myChart" Title="2014" Width="Auto" Height="Auto" MinWidth="400" MinHeight="300" MouseMove="OnMouseMove">
            <!-- hide the legend -->
            <!--<chart:Chart.LegendStyle>
                <Style TargetType="datavisualization:Legend">
                    <Setter Property="Width" Value="0" />
                </Style>
            </chart:Chart.LegendStyle>-->

            <chart:LineSeries Title="Volkswagen"
                              ItemsSource="{Binding Points}"
                              IndependentValueBinding="{Binding Date}"
                              DependentValueBinding="{Binding PriceVW}"
                              MouseMove="OnMouseMove">
                <chart:LineSeries.DependentRangeAxis>
                    <chart:LinearAxis Orientation="Y" Title="Y-Axis Volkswagen" ShowGridLines="True" />
                </chart:LineSeries.DependentRangeAxis>

                <chart:LineSeries.DataPointStyle>
                    <Style TargetType="{x:Type chart:LineDataPoint}">
                        <Setter Property="Background" Value="Red" />
                        <Setter Property="Width" Value="20" />
                        <Setter Property="Height" Value="20" />

                        <Style.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <!--<Setter Property="Background" Value="Blue"/>-->
                                <Setter Property="Background" Value="Transparent" />
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                </chart:LineSeries.DataPointStyle>
            </chart:LineSeries>

            <chart:LineSeries Title="Daimler"
                              ItemsSource="{Binding Points}"
                              IndependentValueBinding="{Binding Date}"
                              DependentValueBinding="{Binding PriceDaimler}">
                <chart:LineSeries.DependentRangeAxis>
                    <chart:LinearAxis Orientation="Y" Title="Y-Axis Daimler" />
                </chart:LineSeries.DependentRangeAxis>
                <!--<chart:LineSeries.IndependentAxis >
                    <chart:DateTimeAxis Orientation="X" Title="non-shared axis" />
                </chart:LineSeries.IndependentAxis>-->
                <chart:LineSeries.DataPointStyle>
                    <Style TargetType="{x:Type chart:LineDataPoint}">
                        <Setter Property="Background" Value="Green"/>
                        <Setter Property="Height" Value="0"/>
                        <Setter Property="Width" Value="0"/>
                    </Style>
                </chart:LineSeries.DataPointStyle>
            </chart:LineSeries>

            <chart:Chart.Axes>
                <chart:DateTimeAxis Name="SharedXAxis"
                                   Orientation="X"
                                  Title="shared X-Axis"
                                  ShowGridLines="True">

                    <!--rotate the X-Axis labels -->
                    <chart:DateTimeAxis.AxisLabelStyle>
                        <Style TargetType="chart:DateTimeAxisLabel">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="chart:DateTimeAxisLabel">
                                        <TextBlock Text="{TemplateBinding FormattedContent}">
                                            <TextBlock.LayoutTransform>
                                                <RotateTransform Angle="90" CenterX = "40" CenterY = "30"/>
                                            </TextBlock.LayoutTransform>
                                        </TextBlock>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </chart:DateTimeAxis.AxisLabelStyle>

                </chart:DateTimeAxis>
            </chart:Chart.Axes>
        </chart:Chart>

    </Grid>
</Window>

 

using System.Windows;
using System.Windows.Controls.DataVisualization.Charting;
using System.Windows.Input;

namespace Demo {
	public partial class MainWindow : Window {

		private Model _Model;

		public MainWindow() {
			InitializeComponent();
		} // constructor

		private void Window_Loaded(object sender, RoutedEventArgs e) {
			ViewModel lViewModel = new ViewModel(myChart);
			DataContext = lViewModel;
			_Model = new Model(lViewModel);
		} // 

		private void OnMouseMove(object sender, MouseEventArgs e) {

			IInputElement lInputElement = sender as IInputElement; // == Chart, LineSeries ...
			Chart lChart = sender as Chart;
			LineSeries lLineSeries = sender as LineSeries;

			Point lPoint = e.GetPosition(lInputElement);
			if (lChart != null) {
				IInputElement lSelection = lChart.InputHitTest(lPoint);
				if (lSelection == null) return;
				InfoBox.Text = lSelection.GetType().ToString();
			}
			else if (lLineSeries != null) {
				IInputElement lSelection = lLineSeries.InputHitTest(lPoint);
				if (lSelection == null) return;
				InfoBox.Text = lSelection.GetType().ToString();
			}
		} //

	} // class
} // namespace

 

using System;
using System.Linq;
using System.Windows.Threading;

namespace Demo {
	public class Model {
		private ViewModel _ViewModel;

		public Model(ViewModel xViewModel) {
			_ViewModel = xViewModel;
			DispatcherTimer lTimer = new DispatcherTimer();
			lTimer.Interval = new TimeSpan(0, 0, 3);
			lTimer.Tick += new EventHandler(Timer_Tick);
			lTimer.Start();
		} // constructor

		void Timer_Tick(object sender, EventArgs e) {
			Random r = new Random();
			PriceCluster lPriceCluster = _ViewModel.Points.Last();
			double lVW = lPriceCluster.PriceVW * (1 + ((2.0 * (r.NextDouble() - 0.5)) / 30.0));
			double lDaimler = lPriceCluster.PriceDaimler * (1 + ((2.0 * (r.NextDouble() - 0.5)) / 30.0));
			_ViewModel.AddPoint(lPriceCluster.Date.AddDays(1), lVW, lDaimler);
		} //

	} // class
} // namespace

 

using System;
using System.Collections.ObjectModel;
using System.Windows.Controls.DataVisualization.Charting;

namespace Demo {
	public class ViewModel {
		private readonly Chart _Chart;
		public ReadOnlyObservableCollection<PriceCluster> Points { get; private set; }
		private ObservableCollection<PriceCluster> _Points = new ObservableCollection<PriceCluster>();

		public ViewModel(Chart xChart) {
			_Chart = xChart;

			AddPoint(new DateTime(2014, 04, 10), 67.29, 13.85);
			AddPoint(new DateTime(2014, 04, 11), 66.15, 13.66);
			AddPoint(new DateTime(2014, 04, 14), 66.22, 13.67);
			AddPoint(new DateTime(2014, 04, 15), 63.99, 13.49);
			AddPoint(new DateTime(2014, 04, 16), 65.32, 13.62);
			AddPoint(new DateTime(2014, 04, 17), 67.29, 13.73);
			AddPoint(new DateTime(2014, 04, 22), 68.72, 13.91);
			AddPoint(new DateTime(2014, 04, 23), 67.85, 13.84);
			AddPoint(new DateTime(2014, 04, 24), 67.75, 13.78);
			AddPoint(new DateTime(2014, 04, 25), 66.29, 13.60);
			AddPoint(new DateTime(2014, 04, 28), 66.99, 13.73);
			AddPoint(new DateTime(2014, 04, 29), 67.79, 13.91);
			AddPoint(new DateTime(2014, 04, 30), 66.73, 13.79);
			AddPoint(new DateTime(2014, 05, 02), 66.24, 13.10);
			AddPoint(new DateTime(2014, 05, 05), 65.90, 13.08);
			AddPoint(new DateTime(2014, 05, 06), 65.16, 13.04);
			AddPoint(new DateTime(2014, 05, 07), 64.80, 13.18);
			AddPoint(new DateTime(2014, 05, 08), 65.00, 13.45);
			AddPoint(new DateTime(2014, 05, 09), 64.52, 13.42);
			AddPoint(new DateTime(2014, 05, 12), 65.28, 13.58);
			AddPoint(new DateTime(2014, 05, 13), 66.48, 13.40);
			AddPoint(new DateTime(2014, 05, 14), 66.74, 13.26);
			AddPoint(new DateTime(2014, 05, 15), 66.00, 12.97);
			AddPoint(new DateTime(2014, 05, 16), 65.21, 13.08);
			AddPoint(new DateTime(2014, 05, 19), 66.02, 13.38);
			AddPoint(new DateTime(2014, 05, 20), 66.46, 13.42);
			AddPoint(new DateTime(2014, 05, 21), 67.15, 13.84);
			AddPoint(new DateTime(2014, 05, 22), 67.52, 13.84);
			AddPoint(new DateTime(2014, 05, 23), 68.14, 14.06);
			AddPoint(new DateTime(2014, 05, 26), 69.61, 14.17);
			AddPoint(new DateTime(2014, 05, 27), 69.56, 14.15);
			AddPoint(new DateTime(2014, 05, 28), 69.29, 14.17);
			AddPoint(new DateTime(2014, 05, 29), 69.65, 14.18);
			AddPoint(new DateTime(2014, 05, 30), 69.70, 14.29);
			AddPoint(new DateTime(2014, 06, 02), 69.32, 14.31);
			AddPoint(new DateTime(2014, 06, 03), 69.68, 14.32);
			AddPoint(new DateTime(2014, 06, 04), 69.31, 14.31);
			AddPoint(new DateTime(2014, 06, 05), 70.31, 14.34);
			AddPoint(new DateTime(2014, 06, 06), 70.24, 14.42);
			AddPoint(new DateTime(2014, 06, 09), 70.09, 14.42);
			AddPoint(new DateTime(2014, 06, 10), 70.08, 14.47);
			AddPoint(new DateTime(2014, 06, 11), 69.66, 14.30);
			AddPoint(new DateTime(2014, 06, 12), 69.49, 14.26);
			AddPoint(new DateTime(2014, 06, 13), 69.12, 14.42);
			AddPoint(new DateTime(2014, 06, 16), 69.05, 14.44);
			AddPoint(new DateTime(2014, 06, 17), 69.65, 14.43);
			AddPoint(new DateTime(2014, 06, 18), 69.62, 14.62);
			AddPoint(new DateTime(2014, 06, 19), 70.10, 14.93);
			AddPoint(new DateTime(2014, 06, 20), 70.08, 14.93);
			AddPoint(new DateTime(2014, 06, 23), 69.46, 14.97);
			AddPoint(new DateTime(2014, 06, 24), 69.04, 15.06);
			AddPoint(new DateTime(2014, 06, 25), 68.71, 14.89);
			AddPoint(new DateTime(2014, 06, 26), 68.14, 15.12);
			AddPoint(new DateTime(2014, 06, 27), 68.33, 15.17);
			AddPoint(new DateTime(2014, 06, 30), 68.40, 15.08);
			AddPoint(new DateTime(2014, 07, 01), 69.19, 15.21);
			AddPoint(new DateTime(2014, 07, 02), 69.72, 15.20);
			AddPoint(new DateTime(2014, 07, 03), 70.44, 15.31);
			AddPoint(new DateTime(2014, 07, 04), 70.44, 15.16);
			AddPoint(new DateTime(2014, 07, 07), 69.28, 14.95);
			AddPoint(new DateTime(2014, 07, 08), 68.15, 14.84);
			AddPoint(new DateTime(2014, 07, 09), 68.16, 14.73);
			AddPoint(new DateTime(2014, 07, 10), 67.05, 14.43);
			AddPoint(new DateTime(2014, 07, 11), 66.68, 14.50);
			AddPoint(new DateTime(2014, 07, 14), 67.61, 14.60);
			AddPoint(new DateTime(2014, 07, 15), 67.28, 14.70);
			AddPoint(new DateTime(2014, 07, 16), 67.77, 14.89);
			AddPoint(new DateTime(2014, 07, 17), 66.56, 14.53);
			AddPoint(new DateTime(2014, 07, 18), 65.40, 14.52);
			AddPoint(new DateTime(2014, 07, 21), 64.84, 14.49);
			AddPoint(new DateTime(2014, 07, 22), 66.09, 14.83);
			AddPoint(new DateTime(2014, 07, 23), 65.58, 14.74);
			AddPoint(new DateTime(2014, 07, 24), 66.30, 14.92);
			AddPoint(new DateTime(2014, 07, 25), 65.15, 14.65);
			AddPoint(new DateTime(2014, 07, 28), 63.08, 14.61);
			AddPoint(new DateTime(2014, 07, 29), 63.89, 14.71);
			AddPoint(new DateTime(2014, 07, 30), 63.07, 14.43);
			AddPoint(new DateTime(2014, 07, 31), 61.88, 14.13);
			AddPoint(new DateTime(2014, 08, 01), 60.85, 13.60);
			AddPoint(new DateTime(2014, 08, 04), 61.17, 13.58);
			AddPoint(new DateTime(2014, 08, 05), 60.43, 13.61);
			AddPoint(new DateTime(2014, 08, 06), 59.82, 13.40);
			AddPoint(new DateTime(2014, 08, 07), 58.95, 13.16);
			AddPoint(new DateTime(2014, 08, 08), 59.27, 13.16);
			AddPoint(new DateTime(2014, 08, 11), 60.71, 13.36);
			AddPoint(new DateTime(2014, 08, 12), 59.85, 13.17);
			AddPoint(new DateTime(2014, 08, 13), 60.66, 13.80);
			AddPoint(new DateTime(2014, 08, 14), 61.07, 13.77);
			AddPoint(new DateTime(2014, 08, 15), 59.71, 13.65);
			AddPoint(new DateTime(2014, 08, 18), 60.99, 13.72);
			AddPoint(new DateTime(2014, 08, 19), 61.60, 13.72);
			AddPoint(new DateTime(2014, 08, 20), 61.33, 13.82);
			AddPoint(new DateTime(2014, 08, 21), 62.20, 13.86);
			AddPoint(new DateTime(2014, 08, 22), 61.65, 13.70);
			AddPoint(new DateTime(2014, 08, 25), 62.88, 13.88);
			AddPoint(new DateTime(2014, 08, 26), 63.49, 13.87);
			AddPoint(new DateTime(2014, 08, 27), 63.15, 13.89);
			AddPoint(new DateTime(2014, 08, 28), 62.16, 13.77);
			AddPoint(new DateTime(2014, 08, 29), 62.24, 13.83);
			AddPoint(new DateTime(2014, 09, 01), 61.88, 13.92);
			AddPoint(new DateTime(2014, 09, 02), 61.82, 13.92);
			AddPoint(new DateTime(2014, 09, 03), 62.90, 14.17);
			AddPoint(new DateTime(2014, 09, 04), 64.14, 14.34);
			AddPoint(new DateTime(2014, 09, 05), 65.17, 14.40);

			Points = new ReadOnlyObservableCollection<PriceCluster>(_Points);
		} // constructor

		// only to be called from the dispatcher thread!
		public void AddPoint(DateTime xDate, double xPriceVW, double xPriceDaimler) {
			_Points.Add(new PriceCluster(xDate, xPriceVW, xPriceDaimler));
		} //

	} // class
} // namespace

 

using System;

namespace Demo {
	public class PriceCluster {
		public DateTime Date { get; set; }
		public double PriceVW { get; set; }
		public double PriceDaimler { get; set; }

		public PriceCluster(DateTime xDate, double xPriceVW, double xPriceDaimler) {
			Date = xDate;
			PriceVW = xPriceVW;
			PriceDaimler = xPriceDaimler;
		} // constructor
	} // class
} // namespace
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About Bastian M.K. Ohta

Happiness only real when shared.

Posted on September 17, 2014, in Advanced, Basic, C#, Charts, DataBinding, WPF and tagged , , , , , , , , . Bookmark the permalink. Leave a comment.

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