如何实现按住屏幕，使一个矩形旋转

Question

如何按住屏幕，使屏幕上的矩形旋转，离开屏幕，矩形停止旋转？而且不回复初始样子

用什么方法？？？

请大神指教，谢谢

Answer 1

已经解决

<Canvas Name="ceshi" Grid.Row="1" Background="Black" PointerPressed="Canvas_PointerPressed" PointerReleased="Canvas_PointerReleased" Width="400" PointerEntered="Canvas_PointerEntered" >

            <Ellipse  Height="15" Canvas.Left="140" Stroke="Black" Canvas.Top="394" Width="15" Fill="#FFF50909" RenderTransformOrigin="3.934,0.612">
                <Ellipse.RenderTransform >
                    <RotateTransform x:Name="ceshi_1"/>
                </Ellipse.RenderTransform>
            </Ellipse>
            <Ellipse  Fill="#FF09A2F9" Height="15" Canvas.Left="245" Stroke="Black" Canvas.Top="394" Width="15" RenderTransformOrigin="-3.066,0.695">
                <Ellipse.RenderTransform >
                    <RotateTransform x:Name="ceshi_2"/>
                </Ellipse.RenderTransform>
            </Ellipse>
            <Canvas.Resources >
                <Storyboard x:Name="storyboard_1">
                    <DoubleAnimation To="720"
                                     EnableDependentAnimation="True"
                                     AutoReverse="False"
                                     RepeatBehavior="Forever"
                                     Duration=" 0:0:3"
                                     Storyboard.TargetName="ceshi_1"
                                     Storyboard.TargetProperty="Angle">
                    </DoubleAnimation>
                    <DoubleAnimation To="720"
                                     EnableDependentAnimation="True"
                                     AutoReverse="False"
                                     RepeatBehavior="Forever"
                                     Duration=" 0:0:3"
                                     Storyboard.TargetName="ceshi_2"
                                     Storyboard.TargetProperty="Angle">
                    </DoubleAnimation>
                   
                   
                   
                </Storyboard>
                <Storyboard x:Name="storyboard_2">
                    <DoubleAnimation To="-720"
                                     EnableDependentAnimation="True"
                                     AutoReverse="False"
                                     RepeatBehavior="Forever"
                                     Duration=" 0:0:3"
                                     Storyboard.TargetName="ceshi_1"
                                     Storyboard.TargetProperty="Angle">
                    </DoubleAnimation>
                    <DoubleAnimation To="-720"
                                     EnableDependentAnimation="True"
                                     AutoReverse="False"
                                     RepeatBehavior="Forever"
                                     Duration=" 0:0:3"
                                     Storyboard.TargetName="ceshi_2"
                                     Storyboard.TargetProperty="Angle">
                    </DoubleAnimation>

                </Storyboard>

            </Canvas.Resources>

        </Canvas>

后台

private void Canvas_PointerPressed(object sender, PointerRoutedEventArgs e)
        {
            if (point .X >200)
            storyboard_1.Begin();
            else
                storyboard_2.Begin();
         
           
        }

        private void Canvas_PointerReleased(object sender, PointerRoutedEventArgs e)
        {
           
            if (point.X > 200)
                storyboard_1.Pause();
            else
                storyboard_2.Pause();
               
           
           
           
           
          
        }
        Point point = new Point();
        private void Canvas_PointerEntered(object sender, PointerRoutedEventArgs e)
        {
            point = e.GetCurrentPoint(ceshi).Position;
        }

谁有更好的办法请通知我 谢谢

Answer 2

很高兴你的问题解决了，RotateTransform 是我们常用的实现方式

这里还有一篇Rob的文章，英语还可以的话可以参考：http://blogs.msdn.com/b/wsdevsol/archive/2014/06/10/constraining-manipulations.aspx

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Answer 3

楼主Nice, 版主威武！