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Wallace
75
HitText's XValue and YValue incorrect after chart resizes?
posted

I'm plotting X-Y data using ScatterLine series in a XamChart.

I'm using the XamChart.MouseMove to display the X-Y values in a couple text boxes as the user mouses over the chart. Something like this:

void OnChartMouseMove(object sender, MouseEventArgs e)
{
    var args = chart.HitTest(e);
    var x = args.XValue;
    var y = args.YValue;

    XValueTextBlock.Text = String.Format("X: {0:G5}", x);
    YValueTextBlock.Text = String.Format("Y: {0:G5}", y);
}

Everything works well until the user changes the application window size, resulting in a resized XamChart. After that, the values of HitTestArgs.XValue and HitTestArgs.YValue are incorrect.

Has anyone else seen this problem? Anyone know how to work around?

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  • 75
    posted

    This sample illustrates the problem. When you run it., the window starts out at 300 x 300 and the values in the textblock are correct. If you maximize the Window and mouse over the chart, the values are incorrect.

    <Window x:Class="HitTestTest.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:ig="clr-namespace:Infragistics.Windows.Chart;assembly=Infragistics3.Wpf.Chart.v8.2"
        Title="Window1" Height="300" Width="300">
        <DockPanel>
            <TextBlock DockPanel.Dock="Bottom" x:Name="textBlock" TextAlignment="Center" />
            <ig:XamChart x:Name="xamChart" MouseMove="xamChart_MouseMove">
                <ig:XamChart.Series>
                    <ig:Series x:Name="xamSeries" ChartType="ScatterLine" DataMapping="ValueX=X;ValueY=Y" />
                </ig:XamChart.Series>
            </ig:XamChart>
        </DockPanel>
    </Window>

    using System;
    using System.Windows;
    using System.Windows.Input;

    namespace HitTestTest
    {
        public partial class Window1 : Window
        {
            public Window1()
            {
                InitializeComponent();

                this.Loaded += delegate
                {
                    xamSeries.DataSource = new Point[]
                    {
                        new Point { X = 0, Y = 0 },
                        new Point { X = 10, Y = 10},
                    };
                };
            }

            private void xamChart_MouseMove(object sender, MouseEventArgs e)
            {
                var args = xamChart.HitTest(e);
                textBlock.Text = String.Format("({0:0.0},{1:0.0})",
                    args.XValue, args.YValue);
            }
        }
    }
     

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