【转】解决WPF图片模糊最佳方法(绑定PixelWidth与PixelHeight)

解决WPF图片模糊最佳方法(绑定PixelWidth与PixelHeight)

转载自:http://www.360doc.com/content/13/1126/09/10504424_332211753.shtml#

从事WPF开发一年有余,对于图片显示模糊相信很多人都遇到过。网络上查找能得到一堆解决方法,但都是会带来其他负面影响得不到最佳效果。其实,有些图片会因为垂直分辨率/水平分辨率不同而造成在WPF界面上显示出现模糊。WPF默认是96Dpi,但有些图片可能是72DPI甚至更低或更高,这样就会出现图片显示后被放大或缩小。解决的方法是通过绑定图片的Source.PixelHeight与Source.PixelWidth并结合Stretch="Fill"或UseLayoutRounding="True"来限制图片大小达到最佳效果。

 

1.先看本人制作的两张演示图片(注意是不同分辨率的图片):

 (分辨率96DPI 宽高67*71) (分辨率72DPI 宽高:50*53)

2.编写一个简单的WPF应用程序用来显示图片

2.1 前端代码MainWindow.xaml:

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<Window x:Class="ImgDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="图片显示模糊示例" Height="539.818" Width="671.169">
    <Window.Resources>
        <BitmapImage x:Key="vs1" UriSource="/ImgDemo;component/Images/vs1.png"></BitmapImage>
        <BitmapImage x:Key="vs2" UriSource="/ImgDemo;component/Images/vs2.png"></BitmapImage>       
    </Window.Resources>
    <Grid>
        <Image HorizontalAlignment="Left"  Source="{StaticResource vs1}" Stretch="None"  VerticalAlignment="Top" Margin="77,75,0,0" />
        <Image HorizontalAlignment="Left"  Source="{StaticResource vs2}" Stretch="None"  VerticalAlignment="Top" Margin="486,75,0,0" />
        <TextBlock Name="txt1" HorizontalAlignment="Left" Margin="77,151,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Height="91" Width="167"/>
        <TextBlock Name="txt2" HorizontalAlignment="Left" Margin="486,151,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Height="82" Width="167"/>

    </Grid>
</Window>
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2.2 后端代码MainWindow.xaml.cs

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namespace ImgDemo
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.Loaded += (s, e) =>
            {
                BitmapImage vs1 = this.FindResource("vs1") as BitmapImage;
                BitmapImage vs2 = this.FindResource("vs2") as BitmapImage;
                txt1.Text = string.Format("Source.PixelWidth:{0}\r\nSource.PixelHeight:{1}", vs1.PixelWidth, vs1.PixelHeight);
                txt2.Text = string.Format("Source.PixelWidth:{0}\r\nSource.PixelHeight:{1}", vs2.PixelWidth, vs2.PixelHeight);

            };
        }
    }
}
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2.3 运行结果:(注意右边的图片因为分辨率原因明显模糊且与实际大小不符合)

3.解决方法修改MainWindow.xaml.cs代码如下:

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<Window x:Class="ImgDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="图片显示模糊示例" Height="539.818" Width="671.169">
    <Window.Resources>
        <BitmapImage x:Key="vs1" UriSource="/ImgDemo;component/Images/vs1.png"></BitmapImage>
        <BitmapImage x:Key="vs2" UriSource="/ImgDemo;component/Images/vs2.png"></BitmapImage>       
    </Window.Resources>
    <Grid>
        <Image HorizontalAlignment="Left"  Source="{StaticResource vs1}" Stretch="None"  VerticalAlignment="Top" Margin="77,75,0,0" />
        <Image HorizontalAlignment="Left"  Source="{StaticResource vs2}" Stretch="Fill"  VerticalAlignment="Top" Margin="486,75,0,0" 
               Width="{Binding Source.PixelWidth, Mode=OneWay, RelativeSource={RelativeSource Self}}" 
               Height="{Binding Source.PixelHeight, Mode=OneWay, RelativeSource={RelativeSource Self}}"/>
        <TextBlock Name="txt1" HorizontalAlignment="Left" Margin="77,151,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Height="91" Width="167"/>
        <TextBlock Name="txt2" HorizontalAlignment="Left" Margin="486,151,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Height="82" Width="167"/>

    </Grid>
</Window>
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4.最终目标运行效果

5.总结

对于不同分辨率的图片如果在Winform显示是不会出现放大模糊的情况,但WPF就是让人纠结搞到程序员不停的绕圈找方法。其实,本来这可以避免的,只要要求美工制作标准分辨率的图片96DPI,但作为程序员还是要预防一下,确保界面显示的完美。由于语文水平有限,表达不明确之处请多包涵。

posted @ 2014-07-29 12:50  qidong_kevin  阅读(365)  评论(0编辑  收藏  举报