WPF水珠效果按钮组

原文:WPF水珠效果按钮组

效果图

1 <EventTrigger RoutedEvent="Click">
2     <BeginStoryboard>
3         <Storyboard>
4             <PointAnimationUsingKeyFrames Storyboard.TargetName="pf_main" Storyboard.TargetProperty="StartPoint" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
5                 <EasingPointKeyFrame Value="40,0" KeyTime="0:0:0.2"></EasingPointKeyFrame>
6             </PointAnimationUsingKeyFrames>
7             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main0" Storyboard.TargetProperty="Point1" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
8                 <EasingPointKeyFrame Value="68,-10" KeyTime="0:0:0.2"></EasingPointKeyFrame>
9             </PointAnimationUsingKeyFrames>
10             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main0" Storyboard.TargetProperty="Point2" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
11                 <EasingPointKeyFrame Value="115,14" KeyTime="0:0:0.2"></EasingPointKeyFrame>
12             </PointAnimationUsingKeyFrames>
13             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main0" Storyboard.TargetProperty="Point3" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
14                 <EasingPointKeyFrame Value="100,66" KeyTime="0:0:0.2"></EasingPointKeyFrame>
15             </PointAnimationUsingKeyFrames>
16             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main1" Storyboard.TargetProperty="Point1" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
17                 <EasingPointKeyFrame Value="100,67" KeyTime="0:0:0.2"></EasingPointKeyFrame>
18             </PointAnimationUsingKeyFrames>
19             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main1" Storyboard.TargetProperty="Point2" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
20                 <EasingPointKeyFrame Value="85,111" KeyTime="0:0:0.2"></EasingPointKeyFrame>
21             </PointAnimationUsingKeyFrames>
22             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main1" Storyboard.TargetProperty="Point3" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
23                 <EasingPointKeyFrame Value="33,103" KeyTime="0:0:0.2"></EasingPointKeyFrame>
24             </PointAnimationUsingKeyFrames>
25             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main2" Storyboard.TargetProperty="Point1" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
26                 <EasingPointKeyFrame Value="22,103" KeyTime="0:0:0.2"></EasingPointKeyFrame>
27             </PointAnimationUsingKeyFrames>
28             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main2" Storyboard.TargetProperty="Point2" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
29                 <EasingPointKeyFrame Value="-15,85" KeyTime="0:0:0.2"></EasingPointKeyFrame>
30             </PointAnimationUsingKeyFrames>
31             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main2" Storyboard.TargetProperty="Point3" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
32                 <EasingPointKeyFrame Value="-6,50" KeyTime="0:0:0.2"></EasingPointKeyFrame>
33             </PointAnimationUsingKeyFrames>
34             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main3" Storyboard.TargetProperty="Point1" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
35                 <EasingPointKeyFrame Value="4,9" KeyTime="0:0:0.2"></EasingPointKeyFrame>
36             </PointAnimationUsingKeyFrames>
37             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main3" Storyboard.TargetProperty="Point2" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
38                 <EasingPointKeyFrame Value="41,-1" KeyTime="0:0:0.2"></EasingPointKeyFrame>
39             </PointAnimationUsingKeyFrames>
40             <PointAnimationUsingKeyFrames Storyboard.TargetName="bs_main3" Storyboard.TargetProperty="Point3" BeginTime="0:0:0.7" AutoReverse="True" RepeatBehavior="5x" FillBehavior="Stop">
41                 <EasingPointKeyFrame Value="42,0" KeyTime="0:0:0.2"></EasingPointKeyFrame>
42             </PointAnimationUsingKeyFrames>
43         </Storyboard>
44     </BeginStoryboard>
45 </EventTrigger>

View Code

item

按钮的位置
不管是奇数个,还是偶数个,我们都想让它以Y轴对称

首先把圆分成8等份,每一份都是45度,也就是最多只能放下8个item,



从上图可以看出来,其实就是奇数个在线上,偶数个在两线之间

有个简单的办法,就是先在顶点依次顺时针排列,每个item间隔45度,然后再逆时针旋转,每多一个item就多转45/2度(两条分割线是45度,中间也就是45/2度),如下图:



上图是item终点的位置,起点的位置是在圆心.

动画用DoubleAnimation控制item按钮的位移,从圆心移动到计算后的位置

计算位置的代码:

1 //函数是弧度制 2PI是360度
2 1 a = c * Math.Sin(2 * Math.PI / 8 * i - (itemsSource.Count - 1) * 2 * Math.PI / 8 / 2);
3 2 b = c * Math.Cos(2 * Math.PI / 8 * i - (itemsSource.Count - 1) * 2 * Math.PI / 8 / 2);

水球连接的部分
连接的部分是用两个二次贝塞尔和一条直线做一个path



开始的时候,两条贝塞尔曲线的高度是0,控制点在path所在矩形的边上,然后对而塞尔曲线上面的点和控制点做动画,分别向上和内移动,最终形成上图右边的图形,然后把这个动画和item按钮向外部移动的动画结合起来,就伪装成了水球分离的效果.



上图红色矩形就是连接部分的path.动画的过程就是Item按钮的直径和大圆相交的时候开始和item按钮一起做动画,最后移动到Item按钮直径所在的位置,整个距离就是Item的半径+item到主体的距离+蓝色的d,而蓝色的d可以通过公式求出

开始的时候也是让连接部分path在圆心的位置.定位方法和定位Item按钮的方法是完全一样的.这里就不在重复了.只说一下c边的距离是:大圆和小圆圆心的距离-连接path高度的一半

源码下载:WaterDropsButtonGroup.zip

参考连接:

https://en.wikipedia.org/wiki/B%C3%A9zier_curve

https://baike.baidu.com/item/%E8%B4%9D%E5%A1%9E%E5%B0%94%E6%9B%B2%E7%BA%BF/1091769?fr=aladdin

https://www.cnblogs.com/ArthurQQ/articles/1730214.html

http://blog.csdn.net/chouglas/article/details/50967566