我试图将Anoto-Pen与TouchDevice
用作SurfaceInkCanvas
。
笔使用打印在纸上的坐标系得出其位置,然后将该位置数据发送到我的应用程序。在这里,我尝试通过子类化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。四处移动ScatterViewItems
并处理按钮“单击到目前为止。
现在的问题是,当我尝试在InkCanvas
上书写时,只会绘制点。观察到触发的事件后,似乎InkCanvas
没有收到OnTouchMove
事件。
我在TouchDown
上注册了TouchMove
,TouchUp
和SurfaceInkCanvas
的事件处理程序。 TouchDown
永远不会触发。 TouchMove
和TouchUp
仅当我在SurfaceInkCanvas
之外开始,然后移动到其中的某个点时。
这是我的TouchDevice
的代码:
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);
}
}
}
我的
App.xaml.cs
中有以下代码,每次输入笔时都会调用它:public void HandleEvent(object sender, EventArgs args)
{
if (typeof(PointInputArgs).IsAssignableFrom(args.GetType()))
{
PenPointInputArgs pointArgs = (PenPointInputArgs)args;
switch (pointArgs.EventType)
{
case InputEvent.Down: touchDevice1.PenDown(pointArgs, this.Dispatcher); break;
case InputEvent.Up: touchDevice1.PenUp(pointArgs, this.Dispatcher); break;
case InputEvent.Move:
case InputEvent.MoveDown: touchDevice1.PenMove(pointArgs, this.Dispatcher); break;
}
}
}
先感谢您。
最佳答案
GetIntermediateTouchPoints
不得返回空数组,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;
}
关于c# - 在Microsoft Surface Window上模拟触摸输入,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/10564914/