How can I get the touching size from TouchPoint class

Question

I built a WPF project
MainWindow.xaml:
<Window x:Class="TouchSize.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" TouchMove="Window_TouchMove" WindowState="Maximized" TouchDown="Window_TouchMove">
<Grid>
<TextBox x:Name="TextBoxOutput" TextWrapping="Wrap" Text="TextBox" Padding="5" Margin="5" IsReadOnly="True" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto"/>
</Grid>
</Window>
MainWindow.xaml.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace TouchSize
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
public MainWindow()
InitializeComponent();
private void Window_TouchMove(object sender, TouchEventArgs e)
TouchPoint tp = e.TouchDevice.GetTouchPoint(this);
I got the TouchPoint while i touching the touch screen, and i want to get the size of the Touching point.
I tried tp.Size but is zero.
Thank you.

Answer 1

If the Size is always 0 in a TouchUp event handler, your touch screen hardware may be the issue. Appearantly some touch screens report sizes in a non-standard way and then you cannot really get the size of the TouchPoint. Please refer to the following
link for more information:
http://nuigroup.com/forums/viewthread/10979/#59933.
Please also remember to close your threads by marking all helpful posts as answer and then start a new thread if you have a new question.