WPF 简易的喷泉效果

这两天领导让我做个喷泉的效果，要把一个个UserControl从一个位置喷出，然后，最后落在最终需要在的位置。

喷泉效果说白了，就是两个步骤：1、放大，从0放大到需要的倍数；2、缩小，平移，从放大的倍数还原到UserControl的原始大小，并且定位到最终的位置。

虽然，只有两步，但是，作为写动画的新手，还是有点费事的，所以，采用了先用Blend设计，然后再转换为C#代码的过程。

一、Blend设计单个UserControl的放大和移动效果

1、在Blend里，新建个项目，然后，在Grid下，放个Canvas，在Canvas下放个Image（先拿Image来设计）

2、在Blend左侧的时间线，选中image控件，然后点击上面的+号，会弹出新增动画资源的弹窗，点击确定。

3、根据需要，拖拽左侧的时间线（黄线）到对应位置，然后，对红框中的Image控件，进行放大、缩小、位置调整等操作。

4、XAML部分，产生了相应的代码

<Window.Resources>
        <Storyboard x:Key="StoryboardFountain">
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)" Storyboard.TargetName="image">
                <EasingDoubleKeyFrame KeyTime="0:0:0" Value="0"/>
                <EasingDoubleKeyFrame KeyTime="0:0:5" Value="5"/>
                <EasingDoubleKeyFrame KeyTime="0:0:10" Value="1"/>
            </DoubleAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)" Storyboard.TargetName="image">
                <EasingDoubleKeyFrame KeyTime="0:0:0" Value="0"/>
                <EasingDoubleKeyFrame KeyTime="0:0:5" Value="5"/>
                <EasingDoubleKeyFrame KeyTime="0:0:10" Value="1"/>
            </DoubleAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)" Storyboard.TargetName="image">
                <EasingDoubleKeyFrame KeyTime="0:0:5" Value="0"/>
                <EasingDoubleKeyFrame KeyTime="0:0:10" Value="-186.5"/>
            </DoubleAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.Y)" Storyboard.TargetName="image">
                <EasingDoubleKeyFrame KeyTime="0:0:5" Value="0"/>
                <EasingDoubleKeyFrame KeyTime="0:0:10" Value="-107"/>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
        <Storyboard x:Key="Storyboard1"/>
    </Window.Resources>
    <Window.Triggers>
        <EventTrigger RoutedEvent="FrameworkElement.Loaded">
            <BeginStoryboard Storyboard="{StaticResource StoryboardFountain}"/>
        </EventTrigger>
    </Window.Triggers>
    <Grid>
        <Canvas HorizontalAlignment="Center" VerticalAlignment="Center">
            <Image x:Name="image" Source="C:\Users\dell\Pictures\WP_20160112_18_55_33_Raw_LI.jpg" Width="50" Height="50" Canvas.Left="-0.5" Canvas.Top="-0.5" RenderTransformOrigin="0.5,0.5">
                <Image.RenderTransform>
                    <TransformGroup>
                        <ScaleTransform/>
                        <SkewTransform/>
                        <RotateTransform/>
                        <TranslateTransform/>
                    </TransformGroup>
                </Image.RenderTransform>
            </Image>
        </Canvas>
    </Grid>

二、把XAML代码转换为C#

有了XAML代码，转换成C#代码，就方便多了，只要把对应的部分相关转换，然后启动动画，就OK了

TransformGroup部分转换为如下的方式

if (uc.RenderTransform as TransformGroup == null)
{
    TransformGroup tg = new TransformGroup();
    uc.RenderTransform = tg;
    tg.Children.Add(new ScaleTransform());
    tg.Children.Add(new TranslateTransform());
}

由于，实际上只用到了ScaleTransform和TranslateTransform，所以，就只写了两个

DoubleAnimationUsingKeyFrames部分转换为如下的方式

EasingDoubleKeyFrame edf1 = new EasingDoubleKeyFrame(Init, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(i + first_value)));
EasingDoubleKeyFrame edf2 = new EasingDoubleKeyFrame(Mul, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(i + middle_value)));
EasingDoubleKeyFrame edf3 = new EasingDoubleKeyFrame(Org, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(i + end_value)));

DoubleAnimationUsingKeyFrames daukf1 = new DoubleAnimationUsingKeyFrames();
daukf1.KeyFrames.Add(edf1);
daukf1.KeyFrames.Add(edf2);
daukf1.KeyFrames.Add(edf3);
storyboard.Children.Add(daukf1);
Storyboard.SetTarget(daukf1, uc);
Storyboard.SetTargetProperty(daukf1, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)"));

对比过XAML代码和C#代码以后，就发现，其实XAML转C#，还是没有那么困难的，就是把相应的位置进行相关的添加值，可以直接从XAML里复制过来，如(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)，谁能记得住呢，反正我记不住，太笨了。

写好了一个UserControl的效果以后，多个的实现起来，就容易了，无外乎就是for循环，设置参数而已。

定义一个UCShow的类，里面包含了UC和最后要定位的位置，如下，将需要展示的集合，都添加到一个List里就ok了。

public class UcShow
{
    private UIElement uc;
    private double top;
    private double left;

    public UIElement Uc
    {
        get
        {
            return uc;
        }

        set
        {
            uc = value;
        }
    }

    public double Top
    {
        get
        {
            return top;
        }

        set
        {
            top = value;
        }
    }

    public double Left
    {
        get
        {
            return left;
        }

        set
        {
            left = value;
        }
    }
}

效果如下：

喷泉效果的代码如下：

class Fountain
{
    /// <summary>
    /// 喷泉效果
    /// </summary>
    /// <param name="cav">画布</param>
    /// <param name="uclist">展示集合</param>
    /// <param name="pL">喷出点左</param>
    /// <param name="pT">喷出点上</param>
    /// <param name="Mul">放大倍数</param>
    /// <param name="middle_value">放大时间点</param>
    /// <param name="end_value">还原时间点</param>
    public void FountainAnimation(Canvas cav,List<UcShow> uclist, double pL = , double pT = , double Mul = , double middle_value = 0.5, double end_value = )
    {
        if (uclist.Count <= )
        {
            return;
        }
        Storyboard storyboard = new Storyboard();

        double Init = ;
        double Org = ;
        double first_value = ;

        for (int i = ; i < uclist.Count; i++)
        {
            UIElement uc = uclist[i].Uc;
            double Top = uclist[i].Top;
            double Left = uclist[i].Left;
            Canvas.SetLeft(uc, pL);
            Canvas.SetTop(uc, pT);
            if (uc.RenderTransform as TransformGroup == null)
            {
                uc.RenderTransformOrigin = new Point(0.5, 0.5);
                TransformGroup tg = new TransformGroup();
                uc.RenderTransform = tg;
                tg.Children.Add(new ScaleTransform());
                tg.Children.Add(new TranslateTransform());
            }
            double first = i * 0.05 + first_value;
            double middle = i * 0.05 + middle_value;
            double end = i * 0.05 + end_value;
            EasingDoubleKeyFrame edf0 = new EasingDoubleKeyFrame(, KeyTime.FromTimeSpan(TimeSpan.FromSeconds()));//所有元素起点都是0
            EasingDoubleKeyFrame edf1 = new EasingDoubleKeyFrame(Init, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(first)));
            EasingDoubleKeyFrame edf2 = new EasingDoubleKeyFrame(Mul, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(middle)));
            EasingDoubleKeyFrame edf3 = new EasingDoubleKeyFrame(Org, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(end)));

            DoubleAnimationUsingKeyFrames daukf1 = new DoubleAnimationUsingKeyFrames();
            daukf1.KeyFrames.Add(edf0);
            daukf1.KeyFrames.Add(edf1);
            daukf1.KeyFrames.Add(edf2);
            daukf1.KeyFrames.Add(edf3);
            storyboard.Children.Add(daukf1);
            Storyboard.SetTarget(daukf1, uc);
            Storyboard.SetTargetProperty(daukf1, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)"));

            DoubleAnimationUsingKeyFrames daukf2 = new DoubleAnimationUsingKeyFrames();
            daukf2.KeyFrames.Add(edf0);
            daukf2.KeyFrames.Add(edf1);
            daukf2.KeyFrames.Add(edf2);
            daukf2.KeyFrames.Add(edf3);
            storyboard.Children.Add(daukf2);
            Storyboard.SetTarget(daukf2, uc);
            Storyboard.SetTargetProperty(daukf2, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)"));

            DoubleAnimationUsingKeyFrames daukf3 = new DoubleAnimationUsingKeyFrames();
            EasingDoubleKeyFrame edf31 = new EasingDoubleKeyFrame(, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(middle)));
            EasingDoubleKeyFrame edf32 = new EasingDoubleKeyFrame(Top, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(end)));
            daukf3.KeyFrames.Add(edf31);
            daukf3.KeyFrames.Add(edf32);
            storyboard.Children.Add(daukf3);
            Storyboard.SetTarget(daukf3, uc);
            Storyboard.SetTargetProperty(daukf3, new PropertyPath("(Canvas.Top)"));

            DoubleAnimationUsingKeyFrames daukf4 = new DoubleAnimationUsingKeyFrames();
            EasingDoubleKeyFrame edf41 = new EasingDoubleKeyFrame(, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(middle)));
            EasingDoubleKeyFrame edf42 = new EasingDoubleKeyFrame(Left, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(end)));
            daukf4.KeyFrames.Add(edf41);
            daukf4.KeyFrames.Add(edf42);
            storyboard.Children.Add(daukf4);
            Storyboard.SetTarget(daukf4, uc);
            Storyboard.SetTargetProperty(daukf4, new PropertyPath("(Canvas.Left)"));
　　　　　　　cav.Children.Add(uc);
        }
        storyboard.FillBehavior = FillBehavior.HoldEnd;
        storyboard.Begin();
    }
}