Question

我正在尝试在Windows Phone 7.1中捕获签名。

我可以在屏幕上绘图但我不能将绘图区域限制为InkPresenter控件，除非在mousemove事件中添加一些处理。

如何使用XAML限制绘图区域，或者这是不可能的？

XAML代码

<InkPresenter  Name="inkTest" Background="White"  MinHeight="180" MinWidth="250" />

代码背后

private Stroke _currentStroke;

private void inkTest_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
    _currentStroke = null;
}

private void inkTest_MouseMove(object sender, MouseEventArgs e)
{
    if (_currentStroke == null) return;
        //HACK: want to set this in XAML
        var position = e.GetPosition(inkTest);
        if (position.X <= inkTest.ActualWidth &&
            position.Y <= inkTest.ActualHeight)

            _currentStroke.StylusPoints.Add(GetStylusPoint(position));
}

private void inkTest_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    inkTest.CaptureMouse();
    _currentStroke = new Stroke();
    _currentStroke.StylusPoints.Add(GetStylusPoint(e.GetPosition(inkTest)));
    _currentStroke.DrawingAttributes.Color = Colors.Blue;
    inkTest.Strokes.Add(_currentStroke);
}

private StylusPoint GetStylusPoint(Point position)
{
    return new StylusPoint(position.X, position.Y);
}

Answer 1

未经测试，但请尝试裁剪：

<InkPresenter  Name="inkTest" Background="White"  MinHeight="180" MinWidth="250">
    <InkPresenter.Clip>
         <RectangleGeometry Rect="0,0,180,250"/>  
    </InkPresenter.Clip>
</InkPresenter>

如果您需要不同的形状，请将RectangleGeometry的边界更改为您想要的边界（或更改RectangleGeometry元素本身。）

将InkPresenter剪切到绘图区域

1 个答案: