利用WPF绘图

C#入门经典 25章的一个例子，利用WPF绘图。

XAML：

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        x:Class="Ch25Ex01.MainWindow"

        Title="Color Spinner" Height="370" Width="270">

    <Window.Resources>

        <Storyboard x:Key="Spin">

            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00"

                Storyboard.TargetName="ellipse1"

                Storyboard.TargetProperty=

   "(UIElement.RenderTransform).(TransformGroup.Children)[0].(RotateTransform.Angle)"

                RepeatBehavior="Forever">

                <SplineDoubleKeyFrame KeyTime="00:00:10" Value="360"/>

            </DoubleAnimationUsingKeyFrames>

            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00"

                Storyboard.TargetName="ellipse2"

                Storyboard.TargetProperty=

    "(UIElement.RenderTransform).(TransformGroup.Children)[0].(RotateTransform.Angle)"

                RepeatBehavior="Forever">

                <SplineDoubleKeyFrame KeyTime="00:00:10" Value="-360" />

            </DoubleAnimationUsingKeyFrames>

            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00"

                Storyboard.TargetName="ellipse3"

                Storyboard.TargetProperty=

    "(UIElement.RenderTransform).(TransformGroup.Children)[0].(RotateTransform.Angle)"

                RepeatBehavior="Forever">

                <SplineDoubleKeyFrame KeyTime="00:00:05" Value="360" />

            </DoubleAnimationUsingKeyFrames>

            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00"

                Storyboard.TargetName="ellipse4"

                Storyboard.TargetProperty=

    "(UIElement.RenderTransform).(TransformGroup.Children)[0].(RotateTransform.Angle)"

                RepeatBehavior="Forever">

                <SplineDoubleKeyFrame KeyTime="00:00:05" Value="-360" />

            </DoubleAnimationUsingKeyFrames>

        </Storyboard>

    </Window.Resources>

    <Window.Triggers>

        <EventTrigger RoutedEvent="FrameworkElement.Loaded">

            <BeginStoryboard Storyboard="{StaticResource Spin}"

                x:Name="Spin_BeginStoryBoard" />

        </EventTrigger>

        <EventTrigger RoutedEvent="ButtonBase.Click" SourceName="goButton" >

            <ResumeStoryboard BeginStoryboardName="Spin_BeginStoryBoard" />

        </EventTrigger>

        <EventTrigger RoutedEvent="ButtonBase.Click" SourceName="stopButton" >

            <PauseStoryboard BeginStoryboardName="Spin_BeginStoryBoard"/>

        </EventTrigger>

    </Window.Triggers>

    <Window.Background>

        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

            <GradientStop Color="#FFFFFFFF" Offset="0" />

            <GradientStop Color="#FFFFC45A" Offset="1" />

        </LinearGradientBrush>

    </Window.Background>

    <Grid>

        <Ellipse Margin="50,50,0,0" Name="ellipse5" Stroke="Black" Height="150"

            HorizontalAlignment="Left" VerticalAlignment="Top" Width="150">

            <Ellipse.Effect>

                <BlurEffect Radius="10" />

            </Ellipse.Effect>

            <Ellipse.Fill>

                <RadialGradientBrush>

                    <GradientStop Color="#FF000000" Offset="1" />

                    <GradientStop Color="#FFFFFFFF" Offset="0.306" />

                </RadialGradientBrush>

            </Ellipse.Fill>

        </Ellipse>

        <Ellipse Margin="15,85,0,0" Name="ellipse1" Stroke="{x:Null}"

            Height="80" HorizontalAlignment="Left" VerticalAlignment="Top"

            Width="120" Fill="Red" Opacity="0.5" RenderTransformOrigin="0.92,0.5">

            <Ellipse.Effect>

                <BlurEffect />

            </Ellipse.Effect>

            <Ellipse.RenderTransform>

                <TransformGroup>

                    <RotateTransform Angle="0"/>

                </TransformGroup>

            </Ellipse.RenderTransform>

        </Ellipse>

        <Ellipse Margin="85,15,0,0" Name="ellipse2" Stroke="{x:Null}"

            Height="120" HorizontalAlignment="Left" VerticalAlignment="Top"

            Width="80" Fill="Blue" Opacity="0.5" RenderTransformOrigin="0.5,0.92">

            <Ellipse.Effect>

                <BlurEffect />

            </Ellipse.Effect>

            <Ellipse.RenderTransform>

                <TransformGroup>

                    <RotateTransform Angle="0"/>

                </TransformGroup>

            </Ellipse.RenderTransform>

        </Ellipse>

        <Ellipse Margin="115,85,0,0" Name="ellipse3" Stroke="{x:Null}"

            Height="80" HorizontalAlignment="Left" VerticalAlignment="Top"

            Width="120" Opacity="0.5" Fill="Yellow"

            RenderTransformOrigin="0.08,0.5">

            <Ellipse.Effect>

                <BlurEffect />

            </Ellipse.Effect>

            <Ellipse.RenderTransform>

                <TransformGroup>

                    <RotateTransform Angle="0"/>

                </TransformGroup>

            </Ellipse.RenderTransform>

        </Ellipse>

        <Ellipse Margin="85,115,0,0" Name="ellipse4" Stroke="{x:Null}"

            Height="120" HorizontalAlignment="Left" VerticalAlignment="Top"

            Width="80" Opacity="0.5" Fill="Green"

            RenderTransformOrigin="0.5,0.08">

            <Ellipse.Effect>

                <BlurEffect />

            </Ellipse.Effect>

            <Ellipse.RenderTransform>

                <TransformGroup>

                    <RotateTransform Angle="0"/>

                </TransformGroup>

            </Ellipse.RenderTransform>

        </Ellipse>

        <Button Height="23" HorizontalAlignment="Left" Margin="20,0,0,56"

            Name="goButton" VerticalAlignment="Bottom" Width="75" Content="Go" />

        <Button Height="23" HorizontalAlignment="Left" Margin="152,0,0,56"

            Name="stopButton" VerticalAlignment="Bottom" Width="75" Content="Stop" />

        <Button Height="23" HorizontalAlignment="Left" Margin="85,0,86,16"

            Name="toggleButton" VerticalAlignment="Bottom" Width="75" Content="Toggle" Click="toggleButton_Click" />

    </Grid>

</Window>

交互逻辑：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using System.Windows.Media.Animation;

namespace Ch25Ex01

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

        }

        private void toggleButton_Click(object sender, RoutedEventArgs e)

        {

            Storyboard spinStoryboard = Resources["Spin"] as Storyboard;

            if (spinStoryboard != null)

            {

                if (spinStoryboard.GetIsPaused(this))

                    spinStoryboard.Resume(this);

                else

                    spinStoryboard.Pause(this);

            }

        }

    }

}

最终效果很炫哦，推荐自己动手实现。

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