我正在尝试将Anoto-Pen用作TouchDevice SurfaceInkCanvas
笔使用打印在纸张上的坐标系统来获取其位置，然后将此位置数据发送到我的应用程序。在那里，我尝试通过继承TouchInput将其转换为TouchDevice，并使用TouchDevice.ReportDown();，TouchDevice.ReportMove()等将发送位置数据和事件转换为.NET Touch-Events。 {1}}周围和处理按钮“点击”到目前为止工作。
现在的问题是，当我尝试在ScatterViewItems上写字时，只绘制了点。在观察了被触发的事件后，InkCanvas似乎没有收到InkCanvas个事件。
我在OnTouchMove上注册了TouchDown，TouchMove和TouchUp的事件处理程序。永远不会触发SurfaceInkCanvas。 TouchDown和TouchMove仅当我从TouchUp之外开始然后移动到其中的某个点时。{/ p>
以下是我SurfaceInkCanvas的代码：
TouchDevice我的using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;
using System.Text.RegularExpressions;
using System.Windows;
using PaperDisplay.PenInput;
using System.Windows.Media;
using System.Windows.Threading;
namespace TouchApp
{
public class PenTouchDevice : TouchDevice
{
public Point Position { get; set; }
public Person Person { get; set; }
public PenTouchDevice(Person person)
: base(person.GetHashCode())
{
Person = person;
}
public override TouchPointCollection GetIntermediateTouchPoints(System.Windows.IInputElement relativeTo)
{
return new TouchPointCollection();
}
public override TouchPoint GetTouchPoint(System.Windows.IInputElement relativeTo)
{
Point point = Position;
if (relativeTo != null)
{
point = this.ActiveSource.RootVisual.TransformToDescendant((Visual)relativeTo).Transform(Position);
}
return new TouchPoint(this, point, new Rect(point, new Size(2.0, 2.0)), TouchAction.Move);
}
public void PenDown(PenPointInputArgs args, Dispatcher dispatcher)
{
dispatcher.BeginInvoke((Action)(() =>
{
SetActiveSource(PresentationSource.FromVisual(Person.Window));
Position = GetPosition(args);
if (!IsActive)
{
Activate();
}
ReportDown();
}));
}
public void PenUp(PenPointInputArgs args, Dispatcher dispatcher)
{
dispatcher.BeginInvoke((Action)(() =>
{
Position = GetPosition(args);
if (IsActive)
{
ReportUp();
Deactivate();
}
}));
}
public void PenMove(PenPointInputArgs args, Dispatcher dispatcher)
{
dispatcher.BeginInvoke((Action)(() =>
{
if (IsActive)
{
Position = GetPosition(args);
ReportMove();
}
}));
}
public Point GetPosition(PenPointInputArgs args)
{
double adaptedX = args.Y - 0.01;
double adaptedY = (1 - args.X) - 0.005;
return new Point(adaptedX * Person.Window.ActualWidth, adaptedY * Person.Window.ActualHeight);
}
}
}
中有以下代码，每次输入笔时都会调用它：
App.xaml.cs提前谢谢。
答案 0 :(得分：-1)
GetIntermediateTouchPoints一定不能返回一个空数组，它应至少包含一个点
public override TouchPointCollection GetIntermediateTouchPoints(System.Windows.IInputElement relativeTo)
{
TouchPointCollection refCollection = new TouchPointCollection();
refCollection.Add(GetTouchPoint(relativeTo));
return refCollection;
}