title: Rotate circle by specific angle in animation using WPF
body: <p>I am trying to create an animation where I want to rotate a circle by specific angle while translating.(Basically to create a wheel rolling on a surface). I want to control the angle of rotation of the wheel . How do I achieve this using per frame based animation.</p>
  
  <pre><code>    &lt;Window x:Class="WheelOnPath.MainWindow"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      Title="MainWindow" Height="1000" Width="1000"   WindowState="Maximized" WindowStartupLocation="CenterScreen"&gt;
  &lt;Border BorderBrush="Gray" BorderThickness="1" Margin="4"&gt;
      &lt;Canvas&gt;
          &lt;Path &gt;
              &lt;Path.Fill&gt;
                  &lt;LinearGradientBrush&gt;
                      &lt;GradientStop Color="Purple" Offset="0.5"/&gt;
                      &lt;GradientStop Color="LightPink" Offset="0.5"/&gt;
                  &lt;/LinearGradientBrush&gt;
              &lt;/Path.Fill&gt;
              &lt;Path.Data&gt;
                  &lt;EllipseGeometry x:Name="rotateEllipse" 
                                   RadiusX="90" RadiusY="90"
                                   Center="100,380"&gt;
  
                  &lt;/EllipseGeometry&gt;
              &lt;/Path.Data&gt;
          &lt;/Path&gt;
      &lt;/Canvas&gt;
  &lt;/Border&gt;
  &lt;/Window&gt;
  </code></pre>
  
  <p>Code</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Windows;
  using System.Windows.Controls;
  using System.Windows.Media.Animation;
  using System.Windows.Media;
  using System.Windows.Shapes;
  using System.Threading;
  
  namespace WheelOnPath
  {
    public partial class MainWindow : Window
  {
      double time = 0, dt = 0;
      TimeSpan lastRender = new TimeSpan();
  
      public MainWindow()
      {
          InitializeComponent();
          lastRender = TimeSpan.FromTicks(DateTime.Now.Ticks);
          CompositionTarget.Rendering += StartRolling;
  
      }
      private void StartRolling(object sender,EventArgs e)
      {
          RenderingEventArgs ra = (RenderingEventArgs)e;
          dt = (ra.RenderingTime - lastRender).TotalSeconds;
          lastRender = ra.RenderingTime;
          double x = rotateEllipse.Center.X + 10;
          rotateEllipse.Center = new Point(x, rotateEllipse.Center.Y);
          *RotateTransform rt = new RotateTransform(45);
          rt.CenterX = 90;
          rt.CenterY = 90;
          rotateEllipse.Transform = rt;*
          time += dt;     
      }
   }
  }
  </code></pre>