I have a rectangle which has an ImageBrush opacity mask (basically a coloured icon).
This is my current code:
<Rectangle Fill="Black">
<Rectangle.OpacityMask>
<ImageBrush ImageSource="/Path/To/Icon.png"/>
</Rectangle.OpacityMask>
</Rectangle>
This produces no result without setting a fixed width and height for the rectangle. Is it possible to size the rectangle according to the ImageBrush image size?
Thanks for your help. Sorry if this is a silly question, I am still learning WPF.
Edit: To clarify, what I am trying to achieve is for the rectangle to behave same as this:
<Image Source="/Path/To/Icon.png"/>
It should be sized according to the dimensions of the image source file.
Stretch="None" keep image size. Rectangle with binding ActualWidth and ActualHeight resize from ImageBrush size. Result is same if we don't use both. On both case rectangle resize to true ImageBrush size. Hope I understand your problem.
<Rectangle Fill="Black" Width="{Binding ActualWidth, ElementName=image}" Height="{Binding ActualHeight, ElementName=image}">
<Rectangle.OpacityMask>
<ImageBrush ImageSource="/Path/To/Icon.png" x:Name="image" Stretch="None">
</ImageBrush>
</Rectangle.OpacityMask>
</Rectangle>
<Rectangle Width="{Binding ActualWidth, ElementName=image}" Height="{Binding ActualHeight, ElementName=image}">
<Rectangle.Fill>
<ImageBrush ImageSource="C:\Users\neeraj\Pictures\Img1.jpg" x:Name="image" Stretch="None">
</ImageBrush>
</Rectangle.Fill>
</Rectangle>
Try this snippet. I am not sure why you wanted the fill black. If idea was to have a Black surrounding, use Background="Black" on the outer Grid.
Related
I've got a Canvas that I'm setting the Background property to a VisualBrush consisting of an Image. I'm data binding the Canvas' Width and Height to the Images' Width and Height. Here's the XAML:
<Canvas x:Name="imageCanvas" ClipToBounds="True" Width="{Binding ActualWidth, ElementName=dataImage}" Height="{Binding ActualHeight, ElementName=dataImage}"
Loaded="imageCanvas_Loaded" MouseMove="imageCanvas_MouseMove">
<Canvas.Background>
<VisualBrush Stretch="Uniform">
<VisualBrush.Visual>
<Image x:Name="dataImage" ClipToBounds="True" RenderOptions.BitmapScalingMode="HighQuality" Stretch="Uniform" Source="{Binding DataImage, Mode=OneWay}" LayoutTransform="{Binding DataImageLayoutTransform, Mode=OneWay}"/>
</VisualBrush.Visual>
</VisualBrush>
</Canvas.Background>
</Canvas>
Note that Image is using a LayoutTransform. I'm using this to stretch the width of the image. If I disable the LayoutTransform binding and run I get the following (properly) rendered output:
However, when I add the LayoutTransform to stretch the width of the image by a factor of 6, the image looks stretched correctly but it is too small i.e. it is not filling the Canvas uniformly:
I suspect this may have something to do with binding the Canvas Height/Width to the image height width, but it's not clear what the exact problem is. Can anyone provide some insight? Thank you in advance.
i'm using this, to show icons that can change their color
<Rectangle Width="100"
Height="100"
Fill="{DynamicResource WhiteBrush">
<Rectangle.OpacityMask>
<ImageBrush Stretch="Uniform" ImageSource={x:Static ImageResources.MyImage}"/>
</Rectangle.OpacityMask>
</Rectangle>
The thing is, that not every Image looks good in 100x100 and if I do not fill these values, nothing is shown. What I wanted to achieve is, that the rectangle automatically takes the needed size of the Image, same as if I would use
<Image Source="{x:Static ImageResources.MyImage}"/>
Any Idea how to achieve this? I already tried to give the ImageBrush a name and reference the size from the rectangle, this doesn't work.
As a workaround I placed an Image at the same position with Visibility=Hidden and get the actualHeight and actualWidth for the Rectangle from there, but that's not an acceptable solution. Any hints welcome.
You could bind the Rectangle's Width and Height:
<Rectangle Fill="{DynamicResource WhiteBrush"
Width="{Binding Width, Source={x:Static ImageResources.MyImage}}"
Height="{Binding Height, Source={x:Static ImageResources.MyImage}}">
<Rectangle.OpacityMask>
<ImageBrush ImageSource="{x:Static ImageResources.MyImage}"/>
</Rectangle.OpacityMask>
</Rectangle>
I am using a canvas with the an ImageBrush to dispaly an image. I am setting the size of the canvas to the original size of the image so I can get the coordinates when I move the mouse etc.
The problem is that when I put the canvas in a control (Grid for example) with a smaller size the Canvas is clipped.
<Grid>
<Canvas Width="{Binding ImageWidth}" Height="{Binding ImageHeight}" >
<Canvas.Background>
<ImageBrush ImageSource="{Binding Image, Converter={StaticResource imgConverter}}"/>
</Canvas.Background>
</Canvas>
</Grid>
Is there a way to keep the canvas size without being clipped?
I've been meaning to dig deeper in to the source to work out where the clipping occurs for a while now, but never get around to doing it. I've been using a not-so-nice trick of inserting a Canvas into the visual tree when this happens as a workaround.
There are a number of controls that clip the child visuals; Grid, StackPanel, etc. As I mentioned the usual quick fix is to use a Canvas after the container that causes the clip.
In your snippet are there more containers higher up the visual tree?
If the depth was actually something like this:-
<StackPanel>
<Grid>
<Canvas Width="{Binding ImageWidth}" Height="{Binding ImageHeight}" >
<Canvas.Background>
<ImageBrush ImageSource="{Binding Image, Converter={StaticResource imgConverter}}"/>
</Canvas.Background>
</Canvas>
</Grid>
</StackPanel>
Then this might cause clipping. If you insert another Canvas further up the visual tree then this clipping is removed.
<StackPanel>
<Canvas>
<Grid>
<Canvas Width="{Binding ImageWidth}" Height="{Binding ImageHeight}" >
<Canvas.Background>
<ImageBrush ImageSource="{Binding Image, Converter={StaticResource imgConverter}}"/>
</Canvas.Background>
</Canvas>
</Grid>
</Canvas>
</StackPanel>
This workaround can then become problematic if it alters other layout needs for other controls.
I have a Item called MiniMap in my xaml. I have set the background of it to a visual brush representting a canvas Item. Now, I want to scale the background to a ratio 0.7 . How can I do it?
Thanks in advance
<local:MiniMap Width="201" Height="134" x:Name="MiniMapItem" MinHeight="100" MinWidth="100" Opacity="1" SnapsToDevicePixels="True" Margin="0,0,20,20" VerticalAlignment="Bottom" HorizontalAlignment="Right">
<local:MiniMap.Background>
<VisualBrush Visual="{Binding ElementName=viewport}" Stretch="None" TileMode="None" AlignmentX="Left" AlignmentY="Top" />
</local:MiniMap.Background>
</local:MiniMap>
Try this:
<VisualBrush Visual="{Binding ElementName=viewport}" Stretch="None" TileMode="None" AlignmentX="Left" AlignmentY="Top">
<VisualBrush.Transform>
<ScaleTransform ScaleX="0.7" ScaleY="0.7" />
</VisualBrush.Transform>
</VisualBrush>
You may need to play with the CenterX and CenterY properties to get it to look right. Usually you'll want them to be set to the middle point of what you're scaling.
The VisualBrush element has the property Viewbox, which can be used to scale the background.
In my project I want to display a small logo on the side of a custom control. Since I have no canvas I thought maybe a Visual Brush would be a good Idea to place the logo in the background.
<VisualBrush>
<VisualBrush.Visual>
<Rectangle Width="200" Height="200" Fill="Red" />
</VisualBrush.Visual>
</VisualBrush>
But the Rectangle I am using right now is not 200x200. It takes the complete available space. Thats not what I want. I also tried a Viewbox and set the stretch property but the result is the same because in the end I don't need a simple Rectangle but a canvas with many path objects as children. A Viewbox supports only one child.
This there any way to get around this problem?
You need to set TileMode, Stretch, AlignmentX and AlignmentY properties on your VisualBrush:
<VisualBrush TileMode="None" Stretch="None" AlignmentX="Left" AlignmentY="Top">
<VisualBrush.Visual>
<Rectangle Height="200" Width="200" Fill="Red"></Rectangle>
</VisualBrush.Visual>
</VisualBrush>
Add Grid and this Set Vertical alligment to Top and Horizontal alignment to Right
Sample code
<VisualBrush x:Key="myVisual">
<VisualBrush.Visual>
<Grid>
<Rectangle Height="200" Width="200" Fill="Red" HorizontalAlignment="Right" VerticalAlignment="Top" ></Rectangle>
</Grid>
</VisualBrush.Visual>
</VisualBrush>
For me, I set the following attribute on the VisualBrush, and the VisualBrush now looks exactly like a MediaElement:
Stretch="Uniform"