如何通过 C# 而不是 XAML 更改对象的 Y 投影轴和颜色 [英] How to change object's Y projection axis and color via C# rather than XAML

问题描述

我正在处理一个 Silverlight 项目，我将通过在 Y 投影轴上旋转矩形来翻转"矩形.我还将更改动画中间的颜色，以便矩形的背面看起来是不同的颜色.我可以在 XAML 中做到这一点没问题，但是我需要通过代码来做到这一点，因为我想动态翻转不同的矩形.我不想为网格上的每个矩形创建动画.这是我的 XAML 的样子:

I'm working on a Silverlight project where I will be 'flipping' rectangles by rotating them on the Y projection axis. I will also change to color in the middle of the animation so that it looks like the back side of the rectangle is a different color. I can do this in XAML no problem however I need to do this via code because I want to dynamically flip different rectangles. I don't want to have to create an animation for each rectangle on the grid. Here's what my XAML looks like:

<Storyboard x:Name="Flip1">
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Projection).(PlaneProjection.RotationY)" Storyboard.TargetName="rectangle">
                <EasingDoubleKeyFrame KeyTime="0" Value="0"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.5" Value="-90"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.6" Value="-90"/>
                <EasingDoubleKeyFrame KeyTime="0:0:1" Value="0"/>
            </DoubleAnimationUsingKeyFrames>
            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" Storyboard.TargetName="rectangle">
                <EasingColorKeyFrame KeyTime="0:0:0.5" Value="Blue"/>
                <EasingColorKeyFrame KeyTime="0:0:0.6" Value="Red"/>
            </ColorAnimationUsingKeyFrames>
        </Storyboard>

我已经多次使用代码创建故事板，但是这个让我对 EasingDoubleKeyFrames 感到有些困惑.任何想法如何去做?

I've created storyboards from code several times however this one is leaving me a bit stumped with the EasingDoubleKeyFrames. Any ideas how to go about doing this?

推荐答案

这应该是第一个动画的翻译:

This should be the translation of the first animation:

var anim = new DoubleAnimationUsingKeyFrames();
anim.KeyFrames.Add(new EasingDoubleKeyFrame() { KeyTime = TimeSpan.FromSeconds(0), Value = 0 });
anim.KeyFrames.Add(new EasingDoubleKeyFrame() { KeyTime = TimeSpan.FromSeconds(0.5), Value = -90 });
anim.KeyFrames.Add(new EasingDoubleKeyFrame() { KeyTime = TimeSpan.FromSeconds(0.6), Value = -90 });
anim.KeyFrames.Add(new EasingDoubleKeyFrame() { KeyTime = TimeSpan.FromSeconds(1), Value = 0 });
Storyboard.SetTarget(anim, rectangle);
Storyboard.SetTargetProperty(anim, new PropertyPath("Projection.RotationY"));

当使用 Storyboards 时，您还需要在名称范围中注册目标，我建议阅读 Storyboard 类.

When using Storyboards you further need to register the target in a namescope, i recommend reading the whole reference of the Storyboard class.

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