I'm trying to figure out how to overlay an image or textbox over an image in WPF. The base image will be hosting a video feed from a Kinect sensor and I want to overlay an image on it. For example the video feed will have a textbox on the feed that will update a counter or an image of a tree on top of the video feed.
Is there a straightforward way of achieving this in the layout? Is it just a matter of changing properties or adding a canvas?
The below picture better illustrates what it is I'm trying to do:
You can use two transparent canvas inside the Grid without any row and column then place your objects in Back and front Canvas accordingly they will overlap
that is:
<Grid>
<VideoControl><!-- I've never tried video --></VideoControl>
<TextBlock Text="My Text" />
</Grid>
Usually you specify <Grid.ColumnDefinitions> and <Grid.RowDefinitions> but since you do not du that here the controls will overlap
HTH
The usual way for me to overlay items in WPF is just to put all of the elements in a Grid. If you do not define any Columns or Rows the elements will overlap.
Example
<Grid>
<Image Source="image on lowest layer" />
<Image Source="overlaying image" />
</Grid>
Related
I am trying to make responsive WPF app which shows image. One of the program's functionalities is selecting a piece of an image by clicking and draging the mouse. I use Point p = e.GetPosition((IInputElement)sender); to find cursor position, and I found out I cannot use Stretch="Fill" because it causes the MouseUp cursor to select a little lower than it should and MouseMove is also inaccurate (I have to drag the mouse a lot further than I should). On the internet, I found the reason for this behavior that you cannot use Fill and have to use None instead. However, the image is much smaller without Fill.
This is my XAML:
<Grid Grid.Row = "1"
Grid.Column="1"
HorizontalAlignment="Left"
VerticalAlignment= "Top"
Margin="0,30,0,0">
<Image x:Name= "image1"
Grid.Row = "1"
Grid.Column="1"
Cursor="Cross"
MinWidth="300"
MinHeight="300"
MaxWidth="512"
MaxHeight= "512"
Stretch = "None"
RenderOptions.BitmapScalingMode="NearestNeighbor"
RenderOptions.EdgeMode="Aliased"
VerticalAlignment="Top"
MouseDown="picOriginal_MouseDown"
MouseMove="picOriginal_MouseMove"
MouseUp="picOriginal_MouseUp" />
</Grid>
I don't know how to embed my image so that in the window view it fills the grid without this Fill property and at the same time is responsive for fullscreen. Should I wrap Image with something else from the WPF toolbox?
I find it easier using the background of the picture box to be the image then use the stretch in that. Alternatively, you could use the image with any of the other options, try using the the properties tab, here are the other stretch options tho: None, Fill, Uniform, UniformToFill
Tell me if this helps, tryna get rep, thanks!
Im trying to create a chat application and Im trying to utilize the RichTextBox control for the chat log, the textbox for the user to enter the message and the users online board. But WPF wont allow me to have more than 1 RichTextBox. Whenever I copy paste the only richtextbox on the window WPF creates a copy of it but deletes the first RTB . It also wont allow me to drag and drop one. What do I have to tweak to allow myself to drop more controls ?
Any Window can only have one child element. In your case, depending on how you intend to layout your RTBs, you would need some sort of Panel. Here's a good place to start.
Here's a really quick example (stripped down) explaining a bit more:
<Window>
<!-- You could put a RTB here, but that would become your root control, and it can't have any siblings -->
<Grid>
<!-- Use something like this to layout your inner RichTextBoxes -->
<Grid.RowDefinitions>
<RowDefinition Height="9*" /> // using 9/10 of the available vertical space
<RowDefinition Height="1*" /> // using 1/10 of the available vertical space
</Grid.RowDefinitions>
<!-- Here you can put multiple controls -->
<RichTextBox Grid.Row="0"></RichTextBox>
<RichTextBox Grid.Row="1"></RichTextBox>
</Grid>
</Window>
You can place a Grid or any other Panel like StackPanel, DockPanel, etc. in the Window and put 2 RichTextBoxes in it. Window is a ContentControl which means it can hold only 1 control. Grid is a Panel so it can hold as many controls as you want.
You can make Columns and rows in the Grid or use Margin explicitly to position your RichTextBoxes.
I'm new to winRT, i'm trying to make a world map app.
I have a canvas control with a lot of path controls in it(every path control represents a country)
Now i want to make something so i can zoom in my canvas, so instead of seeing the wolrd map, i have to focus on, for example, Europe.
I think, it is easy to zoom in an image control, but an image control can't have different path controls in it.
Is there a way to make a zoom behavior or something on a canvas control?
thx in advance
You can try enclosing the canvas inside a ScrollViewer:
<ScrollViewer MinZoomFactor="0.25" >
<Canvas>
<Canvas.Background>
<ImageBrush x:Name="_background" />
</Canvas.Background>
</Canvas>
</ScrollViewer>
...then you can assign an image source to the canvas (in your case, a map).
(Can't add pictures so I'll try and explain it) So my program basically consists of two parts: a bitmap image that is scanned and shown in the main window (on a canvas), and a canvas derived class I made that basically takes data (b&w values ranging from 0-255) from the image and represents it in a histogram format (a bargraph basically) and it overlays the bitmap image (its transparent so you can still see the image).
Alright so I got my program working, the only problem is my canvas derived class wont stretch until I "refresh" the screen. The children of the class (being windows shapes rectangles) wont stretch with the window.
It looks fine up to this point
but then I maximize it...
The rectangles then just stay exactly where they're at. It isn't until I click the "display histogram" button that it will disappear and then after clicking it again, I get...
...Exactly what I want, the histogram is in the right place on the screen. So here's my question, how can I get the histogram to stretch with the main window? instead of having to refresh it every time?
<Border Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="3" BorderBrush="Black" BorderThickness="5" x:Name="testview">
<local:DrawingCanvas x:Name="pbHistogram" IsHitTestVisible="False"
Width="Auto"
Background="Transparent"
Height ="{Binding Path=ActualHeight, ElementName=testview}"/>
</Border>
I know this is not really an answer, but I think the problem is the canvas class itself. It has no automatic layouting or resizing of its child elements. Link to msdn: http://msdn.microsoft.com/en-us/library/ms609101(v=vs.100).aspx
What you could try is to hook up to your main window's resize event and call the same function that the buttonpress calls.
Maybe the quickest, easiest way to do this would be to put your canvas in a Viewbox.
I have a MediaElement full screen on a page. On top of this I have a grid that contains controls (Play,Pause etc..) and general info about the video. These controls are hidden after a few seconds of no user interaction.
If any part of the controls overlap the video being played then the entire Video is blanked out and only reappears when the controls grid is collapsed. Is it not possible to have a control of any kind over the top of a media element?
I notice that the "Video" App that comes as part of Windows8 RTM has this kind of effect over the top of a video that is playing.
UPDATE:
I've found the problem but not a solution. I'm trying to have a "Global" mediaelement so I can view it on different pages (Fullscreen, preview etc). I found this answer
http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/241ba3b4-3e2a-4f9b-a704-87c7b1be7988
And followed Jim Man's suggestion to create a MediaElement on the root frame and then pull that item when needed. The issue happens as soon as I say CurrentPageMediaElement = RootFrameMediaElement
I presume it's changing the z order of the media element to that of the "Global" media element in the root frame? I'm not sure why it shows video when ControlsGrid is collapsed as the root grid is still there. If I change the root grid to have an opacity less than 1 I see the media element all the time as in the code below.
If someone has a better way to share a Global Media Element around then that would also work.
//Here I Can't See The MediaElement
<Grid Style="{StaticResource LayoutRootStyle}" Background="Black">
<MediaElement x:Name="MainMediaElement" />
<Grid x:Name="ControlsGrid" Opacity="0.7" />
</Grid>
//Here I Can See The Media Element
<Grid Style="{StaticResource LayoutRootStyle}" Background="Black" Opacity="0.7">
<MediaElement x:Name="MainMediaElement" />
<Grid x:Name="ControlsGrid" Opacity="0.7">
</Grid>