我有一个包含图像控件的视图。
<Image
x:Name="img"
Height="100"
Margin="5"
Source="{Binding Path=ImageFullPath Converter={StaticResource ImagePathConverter}}"/>
绑定使用的转换器除了将BitmapCacheOption
设置为“OnLoad”之外没有任何其他功能,因此当我尝试旋转它时,文件将被解锁。
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
// value contains the full path to the image
string val = (string)value;
if (val == null)
return null;
// load the image, specify CacheOption so the file is not locked
BitmapImage image = new BitmapImage();
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad;
image.UriSource = new Uri(val);
image.EndInit();
return image;
}
这是旋转图像的代码。 val
始终为90或-90,而path
是我要旋转的.tif
文件的完整路径。
internal static void Rotate(int val, string path)
{
//cannot use reference to what is being displayed, since that is a thumbnail image.
//must create a new image from existing file.
Image image = new Image();
BitmapImage logo = new BitmapImage();
logo.BeginInit();
logo.CacheOption = BitmapCacheOption.OnLoad;
logo.UriSource = new Uri(path);
logo.EndInit();
image.Source = logo;
BitmapSource img = (BitmapSource)(image.Source);
//rotate tif and save
CachedBitmap cache = new CachedBitmap(img, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
TransformedBitmap tb = new TransformedBitmap(cache, new RotateTransform(val));
TiffBitmapEncoder encoder = new TiffBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(tb)); //cache
using (FileStream file = File.OpenWrite(path))
{
encoder.Save(file);
}
}
我遇到的问题是当我将BitmapCacheOption
发送到BitmapCacheOption.OnLoad
时,文件未被锁定,但旋转并不总是旋转图像(我相信它每次都使用原始缓存值)。
如果我使用BitmapCacheOption.OnLoad这样文件没有锁定,那么一旦图像旋转后如何更新Image控件?原始值似乎缓存在内存中。
是否有更好的选择来旋转当前在视图中显示的图像?
答案 0 :(得分:0)
又一年后,我需要这样做,并找到了following solution:
如果您有图片元素:
<grid>
<stackpanel>
<Image Name="img" Source="01.jpg"/>
<Button Click="Button_Click" Content="CLICK"/>
</stackpanel>
</grid>
您可以在代码隐藏中对其进行旋转:
private double rotateAngle = 0.0;
private void RotateButton_Click(object sender, RoutedEventArgs e)
{
img.RenderTransformOrigin = new Point(0.5, 0.5);
img.RenderTransform = new RotateTransform(rotateAngle+=90);
}
或者,假设您的图片元素称为img
:
private double RotateAngle = 0.0;
private void Button_Click(object sender, RoutedEventArgs e)
{
TransformedBitmap TempImage = new TransformedBitmap();
TempImage.BeginInit();
TempImage.Source = MyImageSource; // MyImageSource of type BitmapImage
RotateTransform transform = new RotateTransform(rotateAngle+=90);
TempImage.Transform = transform;
TempImage.EndInit();
img.Source = TempImage ;
}