64 lines
2.0 KiB
C#
64 lines
2.0 KiB
C#
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Velocity animation
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<Page x:Class="Microsoft.Samples.PerFrameAnimations.FrameIndependentFollowExample"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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<Canvas x:Name="containerCanvas" Background="Transparent">
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<Rectangle x:Name="followRectangle" Canvas.Left="0" Canvas.Top="0"
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Fill="blue" Width="60" Height="60" />
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</Canvas>
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</Page>
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//File:Window.xaml.cs
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using System;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Data;
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using System.Windows.Documents;
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using System.Windows.Media;
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using System.Windows.Navigation;
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using System.Windows.Shapes;
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using System.Windows.Media.Animation;
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namespace Microsoft.Samples.PerFrameAnimations
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{
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public partial class FrameIndependentFollowExample : Page
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{
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private Vector _rectangleVelocity = new Vector(0, 0);
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private Point _lastMousePosition = new Point(450, 450);
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private TimeSpan _lastRender;
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public FrameIndependentFollowExample(): base()
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{
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_lastRender = TimeSpan.FromTicks(DateTime.Now.Ticks);
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CompositionTarget.Rendering += UpdateRectangle;
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}
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private void UpdateRectangle(object sender, EventArgs e)
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{
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RenderingEventArgs renderArgs = (RenderingEventArgs)e;
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Double deltaTime = (renderArgs.RenderingTime - _lastRender).TotalSeconds;
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_lastRender = renderArgs.RenderingTime;
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Point location = new Point(0,0);
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Vector toMouse = _lastMousePosition - location;
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double followForce = 1.00;
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_rectangleVelocity += toMouse * followForce;
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double drag = 0.9;
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_rectangleVelocity *= drag;
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location += _rectangleVelocity * deltaTime;
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Canvas.SetLeft(followRectangle, location.X);
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Canvas.SetTop(followRectangle, location.Y);
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}
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}
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}
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