I'm developing a PivotViewer (Silverlight 5) control that makes use of Semantic Zoom. There are two trading card templates, a "small" template displaying a low-resolution image, and a "big" template displaying a higher-resolution version of the same image and some text.
The low-resolution images are bundled in the XAP file. I'd like to dynamically download and display a trading card's higher-resolution image when the high-res version of that template becomes visible. But the best I've been able to do thus far is downloading the image when the trading card is selected through SelectionChanged, as seen here:
http://www.beerolf.com/pivottest/SilverlightLoadTest.html
(When you click a trading card, you should see text saying "Big!!!" indicating that the high-res image is being used. If you zoom into a trading card before clicking it, the original image remains.)
This is okay, but I don't want to force users to click trading cards to see higher-resolution images. Is there any way to determine which trading cards are currently visible?
The trick with multiple templates is to get the sizing right.
In the example that you gave, the templates are loading fairly large since there are not that many of them. In a case like that, you are most likely going straight to the larger template.
I would put the source url of the high-res in your larger templates, so they will load automatically. Is there a reason you aren't doing this?
Related
I am creating an Accounting software on C# WPF and I want this kind of arrow pointing to buttons like a flow structure in the picture.
And want that to be responsive.
I tried using png images of different sizes to show but its very hard and a lot of hard codes and some don't work as expected.
Please tell me a way to create it.
I know path class little bit but don't know how to make resize according to the screen size
I have a desktop app build using .net. I want it to support multilanguages. I am able to do that using resources. Issue is what should I do for images which have text? Should I include all images for separate languages? If so then this will make it difficult and also will increase its size.
I just read that in Android there is "9 patch image", isn't there something similar?
I wish to add background image, and write text on top of that. This background image should resize without change in quality of the image automatically to the size of text in that language.
I couldn't think of any way to avoid separate images with WinForms. WPF, no problem. Web app, no problem. I played around with both text and image on a Button control, but that does not scale fully. I tried using a label over a PIctureBox, but it is impossible to achieve transparency with a Label control. I also tried this using a WebBrowser control--such a thing could possibly work, but would take some further research and would probably change your deployment dramatically (since you would need to make the localization available from some http server).
So I think there is no easy way to do this--I could find nothing easier than maintaining the images separately.
In one of my projects, i had text displayed on top of images. Since the site was multilingual, so no text was part of the images. Instead text was displayed on top of the images, using css properties for absolute position. This had to be tested in all browsers, with multiple languages, as the text size varies in each language, this might break the UI. so enough space has to be provided for text considering all supported languages
I have a project I am working on where the user can upload a frame image in PNG format. After they upload the frame they can upload a photo that will be placed behind the frame. The photo can be resized and moved so they can fit their photo into the frame. Once they are happy with their work, they can save their work.
The canvas is a fixed size on the client. This is an ASP.Net MVC4 application and we are using JavaScript / JQuery. I have only worked a little with the System.Drawing library and not sure how this will all fit together, yet. If this can be done easily in using just .Net and JavaScript / JQuery that would be great, but I am not opposed to using a 3rd party .Net library alongside JavaScript / JQuery.
UPDATE
I am goign share the step the user will go through to Resize, Move, and crop the image.
Step 1: The user loads the frame by clicking on some UI and it opens a popup with a working area of 432px x 348px. The frame is a PNG with a transparent center and outer edge. On that window will be an area for the user to upload an image. As you can see in figure 1, the image is loaded at 100% and goes past the window. The user can choose to move the image around and crop or move onto step 2.
Step 2: The user will move the image around to find the handles so they can resize the image. They can chose to crop at this point without resizing, as well, or move onto step 3.
Step 3: The user will resize the image and move it into place. Once they are finished they will crop the uploaded image.
Step 4: This is the final result after the data is sent to the server to be processed.
It can be done in pure .NET. No other libraries have to be used.
In order to add image uploading feature to Your application, take a look at the answer here: Upload Photo To MVC 4 Applications.
If You make user upload the image with a frame in png format with transparency support, You should be able to just draw one image on another, like in a sample code here (a gif is used there): http://www.daniweb.com/web-development/aspnet/threads/112667/how-to-overlay-two-images-in-c.
You can also support frames in other formats (like jpg or bmp), however, in order to support this scenario, You should manually choose which pixels to draw on the original image. One of the easiests solutions would be to make one of the colors a transparency key, so when a pixel is in this color, it won't be drawn in the resulting image. You can choose bright pink or another color that is rarely used (or even allow a user to choose it). It's still not very complex, buy it requires a little bit more code, some additional work to make it fast and a treshold to detect similar pixels in case of bad quality frame images.
If You want some help with the code, let me know.
Ok, I have a rather strange request.
Due to the inconsistency in how different browsers support text with drop shadow, I was thinking that the text I need with drop shadow (some headers), I could create dynamically on the server side of my web app, and then pass the image to the browser instead of text directly.
I want to use WPF for this, since WPF has a lot of text manipulation built in, and it should be significantly easier to make text with drop shadow in WPF compared to GDI+.
So what I need to do is inside my Web App, create a WPF text element with the drop shadow effect, and save it inside an image (either to disk, or better yes pass it directly to the browser since I actually do not need to store the image since it will be specific for that request only).
I'm hoping for at least some pointers in the right direction :)
I just want to say, since this is unanswered and I don't use WPF that much, GDI+ would actually be pretty easy:
Draw text on image using the desired color of the shadow.
Do a box blur (or Gaussian).
(optional) Create another bitmap and do basically a watermark style draw (this would allow you to set opacity and thus soften the shadow, etc.)
Draw text again using color desired for the text
With that you would have yourself text with a drop shadow. There's about 10 different image processing libraries that make it rather simple (I will sadly do some self promotion and just say that Craig's Utility Library has a draw text function and box blur function in the Utilities.Media.Image.Image class, but there's tons of other packages you could use).
I am working on Image Viewer application and planning to build in WPF. My Image size are usually larger than 3000x3500. After searching for week, I got sample code from MSDN. But it is written in ATL COM.
So I am planning to work and build the Image viewer as follows:
After reading the Image I will scale down to my viewer size, viwer is around 1000x1000. Lets call this Image Data as Display Data. Once displaying this data, I will work only this Display data. For all Image processing operation, I will use this display data and when user choose to save the image, I will apply all the operation to original Image data.
My question is, Is is ok to use Display data for showing and initial image processing operations.
Yes of course. It will speed things up. The only drawbacks are:
Having to replicate the operations on the real bitmap, and
Losing quality if the user zooms in while editing.
These are tradeoffs you'll have to weight against the better performance of the smaller bitmap.