图像缩放问题 [英] Image scaling problem
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问题描述
嗨
这可能是一个简单的错误。但是，我一直在研究这个问题几个小时，看不出有什么问题。
我想通过比例因子进行缩放和成像。请查看以下代码。
< StackPanel >
< StackPanel 名称 = < span class =code-keyword> StackDesktop 宽度 = 自动 高度 = 自动 >
< 标签 名称 = LabSlideName 宽度 = 自动 内容 = 幻灯片名称 高度 = < span class =code-keyword> 25 前景 = 白色 / >
< 网格 名称 = GridPreview 宽度 = 640 高度 = 480 HorizontalAlignment = 中心 VerticalAlignment = 中心 已移除 = DarkBlue >
< 网格 名称 = < span class =code-keyword> GridImage >
< Viewbox 名称 = ViewBoxPreview 拉伸 = 无 StretchDirection = 两者 < span class =code-attribute> / >
< / Grid >
< / Grid >
< / StackPanel >
< / StackPanel >
代码背后
SlideShow.SlideShow node = ExperimentLibrary.Experiment.Instance.GetSlideShow（）。GetNodeByID（id）;
System.Windows.Controls.Image img = new System.Windows.Controls.Image（）;
位图bmp = new Bitmap（（int）node.Slide.PresentationSize.Width，（int）node.Slide.PresentationSize.Height）;
图形g = System.Drawing.Graphics.FromImage（bmp）;
node.Slide.Draw（g）;
IntPtr hBitmap = bmp.GetHbitmap（）;
System.Windows.Media.ImageSource WpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap（hBitmap，IntPtr.Zero，Int32Rect.Empty，BitmapSizeOptions.FromEmptyOptions（））;
img.Source = WpfBitmap;
double scale = GridPreview.Width / System.Windows.SystemParameters.PrimaryScreenWidth;
GridImage.Width =（int）（WpfBitmap.Width * scale）;
GridImage.Height =（int）（WpfBitmap.Height * scale）;
ViewBoxPreview.Stretch = Stretch.UniformToFill; ;
ViewBoxPreview.Child = img;
原始图片尺寸为640 * 480。最终显示的图像是234 * 135。由于比例为0.4685，GridImage.Width = 299，GridImage.Height = 224，我期待最终图像为299 * 224.
有人可以帮助吗因为我被卡住了...
干杯....
解决方案
[这不是回答，应该删除。 OP应该使用改善问题将其移至问题--SA]
看这里，
< StackPanel > ;
< StackPanel 名称 = StackDesktop 宽度 = 自动 高度 = 自动 >
<标签 名称 = LabSlideName 宽度 = 自动 内容 = 幻灯片名称 高度 = 25 前景 = 白色 / >
< 网格 名称 = GridPreview 宽度 = 640 Height = 480 HorizontalAlignment = 中心 VerticalAlignment = 中心 背景 = DarkBlue 保证金 = 26， 0,34,0 >
< 网格 名称 = GridImage >
< / Grid >
< / Grid >
< / StackPanel >
< / StackPanel >
SlideShow.SlideShow node = ExperimentLibrary.Experiment。 。Instance.GetSlideShow（）GetNodeByID（ID）;
System.Windows.Controls.Image img = new System.Windows.Controls.Image（）;
位图bmp = new Bitmap（（int）node.Slide.PresentationSize.Width，（int）node.Slide.PresentationSize.Height）;
图形g = System.Drawing.Graphics.FromImage（bmp）;
node.Slide.Draw（g）;
IntPtr hBitmap = bmp.GetHbitmap（）;
System.Windows.Media.ImageSource WpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap（hBitmap，IntPtr.Zero，Int32Rect.Empty，BitmapSizeOptions.FromEmptyOptions（））;
img.Source = WpfBitmap;
double scale = GridPreview.Width / System.Windows.SystemParameters.PrimaryScreenWidth;
img.Width =（int）（WpfBitmap.Width * scale）;
img.Height =（int）（WpfBitmap.Height * scale）;
img.Stretch = Stretch.UniformToFill; ;
img.StretchDirection = StretchDirection.Both;
GridImage.Children.Add（img）;
图像仍然是234 * 135 ...任何想法为什么？ ？
Hi
This is probably a simple mistake. However, I have been working on this for hours and can''t see what is wrong.
I want to scale and image by a scaling factor. Look at the following code.
<StackPanel>
<StackPanel Name="StackDesktop" Width="Auto" Height="Auto" >
<Label Name="LabSlideName" Width="Auto" Content="Slide Name" Height="25" Foreground="White"/>
<Grid Name="GridPreview" Width="640" Height="480" HorizontalAlignment="Center" VerticalAlignment="Center" removed="DarkBlue" >
<Grid Name="GridImage">
<Viewbox Name="ViewBoxPreview" Stretch="None" StretchDirection="Both" />
</Grid>
</Grid>
</StackPanel>
</StackPanel>
Code Behind
SlideShow.SlideShow node = ExperimentLibrary.Experiment.Instance.GetSlideShow().GetNodeByID(id);
System.Windows.Controls.Image img = new System.Windows.Controls.Image();
Bitmap bmp = new Bitmap((int)node.Slide.PresentationSize.Width, (int)node.Slide.PresentationSize.Height);
Graphics g = System.Drawing.Graphics.FromImage(bmp);
node.Slide.Draw(g);
IntPtr hBitmap = bmp.GetHbitmap();
System.Windows.Media.ImageSource WpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
img.Source = WpfBitmap;
double scale = GridPreview.Width / System.Windows.SystemParameters.PrimaryScreenWidth;
GridImage.Width = (int)(WpfBitmap.Width * scale);
GridImage.Height = (int)(WpfBitmap.Height * scale);
ViewBoxPreview.Stretch = Stretch.UniformToFill; ;
ViewBoxPreview.Child = img;
The original image size is 640*480. The final displayed image is 234*135. As scale is 0.4685, and GridImage.Width = 299 and GridImage.Height = 224, I was expecting the final image to be 299*224.
Can someone please help as I am stuck...
Cheers....
解决方案
[This is not an answer and should be removed. OP should move it to the question using "Improve question" —SA]
Look here,
<StackPanel> <StackPanel Name="StackDesktop" Width="Auto" Height="Auto" > <Label Name="LabSlideName" Width="Auto" Content="Slide Name" Height="25" Foreground="White"/> <Grid Name="GridPreview" Width="640" Height="480" HorizontalAlignment="Center" VerticalAlignment="Center" Background="DarkBlue" Margin="26,0,34,0" > <Grid Name="GridImage"> </Grid> </Grid> </StackPanel> </StackPanel>
SlideShow.SlideShow node = ExperimentLibrary.Experiment.Instance.GetSlideShow().GetNodeByID(id); System.Windows.Controls.Image img = new System.Windows.Controls.Image(); Bitmap bmp = new Bitmap((int)node.Slide.PresentationSize.Width, (int)node.Slide.PresentationSize.Height); Graphics g = System.Drawing.Graphics.FromImage(bmp); node.Slide.Draw(g); IntPtr hBitmap = bmp.GetHbitmap(); System.Windows.Media.ImageSource WpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions()); img.Source = WpfBitmap; double scale = GridPreview.Width / System.Windows.SystemParameters.PrimaryScreenWidth; img.Width = (int)(WpfBitmap.Width * scale); img.Height = (int)(WpfBitmap.Height * scale); img.Stretch = Stretch.UniformToFill; ; img.StretchDirection = StretchDirection.Both; GridImage.Children.Add(img);
Image is still 234*135...Any ideas why???
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