[英]Zoom in imageView image using c# wpf
我試圖創建一個窗口,其中包含“瀏覽”按鈕來加載圖像文件和一個按鈕“+”來放大圖像。 瀏覽按鈕及其打開的對話框成功將圖像加載到Image aka。 當我按下“+”按鈕時,它不會放大加載的圖像,但會使其模糊。 怎么了?
原始加載的圖像名為OriginalSizedImage。 zoomedIn圖像命名為
private void ZoomInButton_Click(object sender, RoutedEventArgs e)
{
BitmapImage newZoomedInImage = new BitmapImage();
newZoomedInImage.BeginInit();
newZoomedInImage.DecodePixelWidth = originalSizedImage.DecodePixelWidth + 20 ;
newZoomedInImage.DecodePixelHeight = originalSizedImage.DecodePixelHeight + 20;
newZoomedInImage.UriSource = originalSizedImage.UriSource;
newZoomedInImage.EndInit();
imageView.Source = newZoomedInImage ;
}
每次更改縮放系數時,創建新的BitmapImage都是不必要且低效的。
最好將Image元素放在剪切它的父元素中
<Grid ClipToBounds="True">
<Image x:Name="imageView" RenderTransformOrigin="0.5,0.5">
<Image.RenderTransform>
<ScaleTransform/>
</Image.RenderTransform>
</Image>
</Grid>
然后修改ScaleTransform
被分配給其RenderTransform
(也許還有其RenderTransformOrigin
):
private void ZoomInButtonClick(object sender, RoutedEventArgs e)
{
var transform = (ScaleTransform)imageView.RenderTransform;
transform.ScaleX *= 1.1;
transform.ScaleY *= 1.1;
}
private void ZoomOutButtonClick(object sender, RoutedEventArgs e)
{
var transform = (ScaleTransform)imageView.RenderTransform;
transform.ScaleX /= 1.1;
transform.ScaleY /= 1.1;
}
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