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Hi. I'm new to this WPF thing, and I was making a simple app (images, buttons, textbox...) when I noticed that the images always are shown at low resolution. No matter what property I set in vs2008, nor what image I load, it still has a bad appearance. Just for testing, I have tried the same images in a form in vs2005 and there they looks ok. What am I missing?
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can you post your code and images?
modified 27-Feb-21 21:01pm.
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I've created a simple test.
http://img235.imageshack.us/img235/2772/testresolutionmv6.png[^]
The left window is a windows form app, background image set to some png; the right one is a wpf form with an image control pointing to the same png. No direct code manipulation, just using the properties window, and both compiled with vs2008 and framework 3.5. As you can see the wpf has lower colordepth and a bit of aliasing (maybe difficult to perceive in the image) while the windows form renders the image ok. So, what am I missing? I've read about create a custom renderer to bypass the "independant device" dpi, but I believe it's too complex for such a simple job as view an image.
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Great example and again good question.
I copied your image into a project and got the same results.
The form on the left is a different size and shape than the one on the right. So WPF is doing its best when it resizes the image to render it.
You can try creating a VECTOR image instead of a BITMAP image. These scale perfectly in WPF.
Yor can create this in either Expression Blend or Expression Design.
I'm going to MIX08 next week, I'll add this question to my TODO list and get back to you next Sunday when I get back.
modified 27-Feb-21 21:01pm.
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Thanks. Just note that the source png is bigger than the two windows (it is, in fact, a background image of a program that run fullscreen, 800x600 IIRC) so both programs has to scale it.
I'll try with a vector image and maybe building the same project in Expression, and I'll post here the results.
Cheers.
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On option:
If the image is larger than the application, then don't scale it. Just let more of the image be exposed as the application is resized.
modified 27-Feb-21 21:01pm.
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Same results with Expression Blend, both scaling and maintaining original size, using an Image container or using a brush created from the image:
http://img81.imageshack.us/img81/9177/testexpressionbn0.jpg[^]
Just seems that framework 3.5 doesn't decode the image properly (or I can't find the place to set it up). I'm downloading expresion desing to try a vector image.
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I was refering to recreating the image as a VECTOR image. In other words, drawing a new one so that I was a VECTOR image, then it would scale perfectly.
modified 27-Feb-21 21:01pm.
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I think I don't fully understand what do you mean. Are you talking about using a vector graphic (like the ones produced by expression design)? Yes, they scales perfectly, but that's not the problem. My problem is the loss of colordepth in preexistent images. Every image that shows in a wpf app has the "compressed" appearance of a thumbnail, no matter the actual size of the image (actually, it doesn't matter the format either, I've just tried with a bunch of JPG and GIF with the same results as the PNG), while the same image using windows.form controls renders as the original.
PS: maybe is there a class that convert raster images in vector ones and I missed it?
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If you are not scalling or resizing a .jpg, .png, etc at runtime or design time, then the image should display perfectly. I've never heard of anyone with this problem.
To be sure, set the Image control height and width to Auto and the Stretch to None and tell me if the problem is still there.
As soon a you resize or scale an image, WPF has to step in and do it's thing.
Vector: If you only have a few backgrounds you want, then you "can" make then from scratch and use them. If you have many images, then this probably won't work for you.
modified 27-Feb-21 21:01pm.
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Yup, I've never heard that before, but as this is a fresh install (I downloaded and installed the iso image of vs2008 from microsoft a couple of days ago) I assume it is not a corruption error.
Im still amazed that some simple test that the one shown in my first screenshot can throw so differents results, but as google shows nobody complaining about colordepth and wpf I'll revise my installation anyway. On monday I will deinstall and reinstall everything again and check.
Cheers.
PS: yes, I'm the previous poster, but codeproject has decided to not accept the password...
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I've set up a virtual machine and installed the vs express and all updates. Now the program shows the image coorectly. Seems that the orginal iso images doesn't install/updates every piece of the runtime.
Anyway, thanks for the interest, and sorry for the noise.
cheers
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WOW! Bummer stuff. Consider reporting this to Microsoft.
I'm glad you got it all sorted out.
modified 27-Feb-21 21:01pm.
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I wrote a simple application:
<Button MouseDown="buttonX_MouseDown" ... />
and C# code:
private void buttonX_MouseDown(object sender, MouseButtonEventArgs e)<br />
{<br />
if (e.RightButton == MouseButtonState.Pressed)<br />
{<br />
...<br />
}<br />
else if (e.LeftButton == MouseButtonState.Pressed)<br />
{<br />
...<br />
}<br />
}
However, this event fires ONLY when I press right mouse button. It does not fire (the whole event) when I press left mouse button over this button. Why?
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Because the Button is eating the left mouse button down.
I think if you set up a handler manually for the event in code, there is an property that you can set to tell WPF that you want to receive the click event after is have been marked as HANDLED.
Just look into wiring up routed events that are HANDLED.
modified 27-Feb-21 21:01pm.
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how can i set shadow for a wpf form (winxp)
i want to design a startup form with shadow over desktop
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for just the start up form, you can use a borderless window, then use a bitmap effect on the window root element.
So if you root element was a Grid, you would apply the bitmap effect to the Grid.
There is a good bit of example WPF code out there that explains creating a transparent, borderless (a window without chrome).
modified 27-Feb-21 21:01pm.
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this way is basic and not specified to wpf
is there any new properties that make shadow for controls in wpf?
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Yes.
BitMap effect.
modified 27-Feb-21 21:01pm.
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Look into WPF DataTemplates. You can use a TemplateSelector to select different templates based on some code in the TemplateSelector or you can use a DataTrigger in the DataTemplate to change which icon is displayed.
modified 27-Feb-21 21:01pm.
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Thanks Karl. It worked for me. One more question, can we have separate icon for each node? I am asking because currently I am assigning image depending upon the HasItem property of treenode. In future I will like to show different icons for each node. Is it possible?
Jayant D. Kulkarni
Brainbench Certified Software Engineer in C#1.1, C# 2.0, ASP.NET, .NET Framework and ADO.NET
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Yep. 
Use one of the two previous methods I gave you and test against the data that is bound to the TreeV Item. Then display the icon you want.
WPF makes things like this very simple for developers. Got to love WPF. ![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
modified 27-Feb-21 21:01pm.
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Thanks Karl for reply. Yes it can be done using different properties, for example check the tag value and set the image. Now I am crating a generic user control and I want these images should dynamically get assigned. So, application1 will like some another icon at root level and different icon at child node level, similarly application2 will like to use some different icons. What I will like to do is let the application using my control set the images programmatically. How can we do this?
Jayant D. Kulkarni
Brainbench Certified Software Engineer in C#1.1, C# 2.0, ASP.NET, .NET Framework and ADO.NET
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