C# WPF 动画在错误的地方跳跃和结束

Question

我的一些函数有问题... 下面的代码获取一个对象并简单地将其沿 x 轴移动指定数量的像素。（我在 y 轴上有另一个）

private void AnimObject_Horizontal( FrameworkElement p_Object, double p_X, int p_Millisec ) {
        // Find out the actual position on the screen
        Point l_Start = p_Object.TransformToAncestor( m_Canvas ).Transform( new Point( 0, 0 ) );

        // Adjust the position, subtracting the Margins, that are set at initialization, because the margin is automaticly added to the PathPoints by C# 
        l_Start.X -= p_Object.Margin.Left;
        l_Start.Y -= p_Object.Margin.Top;

        // Create the path for the object to follow. Moving horizontally is just a straight line, so I just need to set the StartPoint and add a single point, which will be the end
        PathGeometry l_PathGeo = new PathGeometry();
        PathFigure l_PathFigure = new PathFigure();
        l_PathFigure.StartPoint = new Point(l_Start.X, l_Start.Y);
        LineSegment l_LineSegment = new LineSegment( new Point(l_Start.X + p_X, l_Start.Y ), false);
        l_PathFigure.Segments.Add( l_LineSegment );
        l_PathGeo.Figures.Add( l_PathFigure );
        l_PathGeo.Freeze();

        // Create both DoubleAnimations that animate the X and Y value of the given Object
        Transform l_Transform_ = new TranslateTransform();
        DoubleAnimationUsingPath translateXAnimation_ = new DoubleAnimationUsingPath();
        translateXAnimation_.PathGeometry = l_PathGeo;
        translateXAnimation_.Duration = TimeSpan.FromMilliSeconds( p_Millisec  );
        translateXAnimation_.Source = PathAnimationSource.X;

        DoubleAnimationUsingPath translateYAnimation_ = new DoubleAnimationUsingPath();
        translateYAnimation_.PathGeometry = l_PathGeo;
        translateYAnimation_.Duration = TimeSpan.FromMilliSeconds( p_Millisec  );
        translateYAnimation_.Source = PathAnimationSource.Y;

        // Set the object as animationtarget and add Eventhandler (One is enough, because they will both end at the same time (Almost atleast)
        p_Object.RenderTransform = l_Transform_;
        Storyboard.SetTarget( translateXAnimation_, p_Object );
        translateXAnimation_.Completed += AnimationHorizontalComplete;

        // Start both animations
        l_Transform_.BeginAnimation( TranslateTransform.XProperty, translateXAnimation_ );
        l_Transform_.BeginAnimation( TranslateTransform.YProperty, translateYAnimation_ );
    }

虽然此对象将对象移动四分之一圆：

private void AnimObject_LeftToBottom( FrameworkElement p_Object, double p_Radius, int p_Millisec ) {
        Point l_Start = p_Object.TransformToAncestor( m_Canvas ).Transform( new Point( 0, 0 ) );
        l_Start.X -= p_Object.Margin.Left;
        l_Start.Y -= p_Object.Margin.Top;

        // Convert 15 degrees to radians
        double l_Angle_15 = 15 * Math.PI / 180;

        PathGeometry l_Path = new PathGeometry();
        PathFigure l_Figure = new PathFigure();
        l_Figure.StartPoint = l_Start;
        PolyBezierSegment l_BezierSegment = new PolyBezierSegment();

        // Create a quarter-circle-path with beziersegmens. There will be the Startpoint and another point each 15 degrees to form a quarter-circle.             
        for ( int i = 1 ; i < 7 ; i++ ) {
            l_BezierSegment.Points.Add( new Point( l_Start.X + p_Radius * Math.Sin( l_Angle_15 * i ), l_Start.Y + p_Radius - p_Radius * Math.Cos( l_Angle_15 * i ) ) );
        }

        l_Figure.Segments.Add( l_BezierSegment );
        l_Path.Figures.Add( l_Figure );
        l_Path.Freeze();

        Transform l_Transform_ = new TranslateTransform();
        DoubleAnimationUsingPath translateXAnimation_ = new DoubleAnimationUsingPath();
        translateXAnimation_.PathGeometry = l_Path;
        translateXAnimation_.Duration = TimeSpan.FromMilliSeconds( p_Millisec  );
        translateXAnimation_.Source = PathAnimationSource.X;

        DoubleAnimationUsingPath translateYAnimation_ = new DoubleAnimationUsingPath();
        translateYAnimation_.PathGeometry = l_Path;
        translateYAnimation_.Duration = TimeSpan.FromMilliSeconds( p_Millisec  );
        translateYAnimation_.Source = PathAnimationSource.Y;

        p_Object.RenderTransform = l_Transform_;
        Storyboard.SetTarget( translateXAnimation_, p_Object );
        translateXAnimation_.Completed += AnimationLeftBotComplete;
        l_Transform_.BeginAnimation( TranslateTransform.XProperty, translateXAnimation_ );
        l_Transform_.BeginAnimation( TranslateTransform.YProperty, translateYAnimation_ );
    }

如您所见，我向这些函数添加了 "Completed"-Events 并将它们链接起来。我在我的 canvas 中添加了一个图像，当我按下一个按钮时，图像首先沿着 x 轴移动，然后在底部画一个四分之一圆，然后沿着 y 轴移动。

我的问题是：图像从 100,100 开始，应该移动到 200,100，一旦到达这个位置，它应该向下移动一个圆圈。然而，在达到 200,100 之前不久，它跳转到第二个动画起点。（或者它只是没有在应该结束的地方结束）看看图片，它可能有助于理解我用我有点蹩脚的英语想说的话 ;)
AnimationProblem on tinypic

有人知道这种行为的原因吗？

提前问候和感谢，雪拉

Answer 1

我自己修好了。对于分享此问题的人：

以下代码行有点令人困惑，因为它没有按预期工作（至少在我看来是这样）。

Point l_Start = p_Object.TransformToAncestor( m_Canvas ).Transform( new Point( 0, 0 ) );

即使我在 (100, 100) 处创建一个对象，上面代码的结果也将是 (108.3, 100)。起初我认为原因可能是 window 的边界（即使我将 Canvas 的 0,0 设置为参考点），但这不是问题。如果我进入全屏模式，它仍然是一样的，所以这不是原因。我不知道 8.3 是从哪里来的，我不知道这个问题是否只存在于我身上，或者它是否在每台计算机上都有不同的值。

C# WPF 动画在错误的地方跳跃和结束

C# WPF animation jumping and ending in wrong place

c#

wpf

animation