我试图让一个多边形从屏幕左侧完整的移动到屏幕上,然后完全从屏幕右侧移开,然后再次返回.
我已经得到了这个工作.但是,由于某种原因,一旦左边距变为负值,动画就会突然减慢.一旦左边距变为正值,它将再次加速.
为什么会发生这种情况？我该如何阻止？
以下是完整的代码：
<Window x:Class="Geometry.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<PathGeometry x:Key="MyGeometry">
<PathGeometry.Figures>
<PathFigure>
<PathFigure.Segments>
<LineSegment Point="0.30,0" />
<LineSegment Point="0.70,1" />
<LineSegment Point="0.40,1" />
<LineSegment Point="0,0" />
</PathFigure.Segments>
</PathFigure>
</PathGeometry.Figures>
</PathGeometry>
<Storyboard x:Key="MovingAnimation">
<ThicknessAnimationUsingKeyFrames RepeatBehavior="1:0:0" FillBehavior="HoldEnd" Storyboard.TargetName="_path" Storyboard.TargetProperty="Margin" >
<DiscreteThicknessKeyFrame KeyTime="0:0:0" Value="-2.0,0" />
<LinearThicknessKeyFrame KeyTime="0:0:10" Value="1.0,0" />
<LinearThicknessKeyFrame KeyTime="0:0:20" Value="-2.0,0" />
</ThicknessAnimationUsingKeyFrames>
</Storyboard>
</Window.Resources>
<Window.Triggers>
<EventTrigger RoutedEvent="Window.Loaded">
<BeginStoryboard Storyboard="{StaticResource MovingAnimation}" ></BeginStoryboard>
</EventTrigger>
</Window.Triggers>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Orientation="Horizontal">
<Label>Margin:</Label>
<TextBlock Text="{Binding ElementName=_path,Path=Margin.Left,StringFormat={}{0:0.#}}" />
</StackPanel>
<Canvas Name="_canvas" Grid.Row="1">
<Border Margin="0" Width="1" Height="1" VerticalAlignment="Center" HorizontalAlignment="Center">
<Border.RenderTransform>
<ScaleTransform
ScaleX="{Binding ElementName=_canvas,Path=ActualWidth}"
ScaleY="{Binding ElementName=_canvas,Path=ActualHeight}"
CenterX="0"
CenterY="0">
</ScaleTransform>
</Border.RenderTransform>
<Path
Name="_path"
Fill="#CCCCFF"
Data="{StaticResource MyGeometry}"
Width="1.0"
Height="1.0"
>
</Path>
</Border>
</Canvas>
</Grid>
</Window>
解决方法
动画保证金属性将触发额外的度量/安排通行证,从而导致更多的性能影响(尽管在这个例子中可能不明显).另一方面,“仅渲染”属性的动画将不会触发布局重新布置,因此更具性能友好.
请,看看有点简单的方法做什么,我想,你想得到：
<Window x:Class="Geometry.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="518" Width="530">
<Window.Resources>
<PathGeometry x:Key="MyGeometry">
<PathGeometry.Figures>
<PathFigure>
<PathFigure.Segments>
<LineSegment Point="0.30,0" />
<LineSegment Point="0.70,1" />
<LineSegment Point="0.40,1" />
<LineSegment Point="0,0" />
</PathFigure.Segments>
</PathFigure>
</PathGeometry.Figures>
</PathGeometry>
<Storyboard x:Key="MovingAnimation">
<DoubleAnimationUsingKeyFrames RepeatBehavior="1:0:0" FillBehavior="HoldEnd" Storyboard.TargetName="_scaleTransform" Storyboard.TargetProperty="CenterX" >
<LinearDoubleKeyFrame KeyTime="0:0:0" Value="1.2" />
<LinearDoubleKeyFrame KeyTime="0:0:10" Value="-0.5" />
<LinearDoubleKeyFrame KeyTime="0:0:20" Value="1.2" />
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</Window.Resources>
<Window.Triggers>
<EventTrigger RoutedEvent="Window.Loaded">
<BeginStoryboard Storyboard="{StaticResource MovingAnimation}" ></BeginStoryboard>
</EventTrigger>
</Window.Triggers>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Orientation="Horizontal">
<Label>Margin:</Label>
<TextBlock Text="{Binding ElementName=_scaleTransform,Path=CenterX,StringFormat={}{0:0.#}}" VerticalAlignment="Center" />
</StackPanel>
<!--
<Border Grid.Row="1" Margin="150" BorderBrush="Red" BorderThickness="1">
-->
<Grid Name="_canvas" Grid.Row="1">
<Path Name="_path" Fill="#CCCCFF" Data="{StaticResource MyGeometry}"
Width="1.0"
Height="1.0"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Path.RenderTransform>
<ScaleTransform x:Name="_scaleTransform"
ScaleX="{Binding ElementName=_canvas,Path=ActualHeight}"
CenterX="1.2"
CenterY="0.5">
</ScaleTransform>
</Path.RenderTransform>
</Path>
</Grid>
<!--
</Border>
-->
</Grid>
</Window>
