2

我正在尝试使用 Anoto-Pen 作为TouchDevicewith SurfaceInkCanvas。
笔使用打印在一张纸上的坐标系来推导出它的位置，然后这个位置数据被发送到我的应用程序。在那里，我尝试TouchInput通过子类TouchDevice化并将发送位置数据和事件转换为 .NET Touch-Events 使用TouchDevice.ReportDown();,TouchDevice.ReportMove()等来转换它ScatterViewItems。到目前为止，四处移动和处理按钮“点击”有效。

现在的问题是，当我尝试写上InkCanvas唯一的点时。观察触发的事件后，似乎InkCanvas没有收到OnTouchMove事件。

我注册了事件处理程序TouchDown，TouchMove并TouchUp在我的SurfaceInkCanvas. TouchDown永远不会触发。只有当我从外面开始TouchMove然后移动到里面的一个点时。TouchUpSurfaceInkCanvas

这是我的代码TouchDevice：

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);
    }
}
}

我的代码中有以下代码，App.xaml.cs每次出现笔输入时都会调用它：

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。

4

1 回答 1

-1

GetIntermediateTouchPoints不能返回一个空数组，它应该至少包含一个点

public override TouchPointCollection GetIntermediateTouchPoints(System.Windows.IInputElement relativeTo)
{
    TouchPointCollection refCollection = new TouchPointCollection();
    refCollection.Add(GetTouchPoint(relativeTo));
    return refCollection;
}
于 2012-06-21T16:36:36.500 回答