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I am doing Coloring Game. Where i am doing coloring the picture. I have done that. But i have to undo the color . It should revert back .
For eg: windows paint. Draw and Undo Same Feature. can any one can post sample code.
This is a very broad topic. There are many ways to solve this.
For pixel-based drawing (as opposed to vector-based), the most straightforward method is to save a copy of the image before each drawing operation. ("Save" in this case means make a copy in memory, not write it to disk.) To undo an operation, revert to the previous version of the image. Even "large" images these days are relatively small compared to the amount of RAM available on a typical machine. Keeping a list of, say, 20 images, giving 20 undo steps, shouldn't be a problem.
For vector-based drawing, keep a List<> of objects as they are drawn. To undo, delete the last object that was added.
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When i drew line charts using c# with a lot of data(maybe 10 million~100 million), it's not loaded. c# window form was broken.
i can't reduce these data because all of data are important.
Surely it is impossible to show all 10 million data points on a screen. My current screen resolution at 1920x1080 only has about 2M pixels. So even if you show all the points from your data, there will not be enough screen space to show it all.
So you'll need to either reduce your data size by smoothing out the graph data or show only parts of your data at a time.
Use for example Oxyplot - you just bind data, and the library does all the work - zooming, paning, smoothing graphs.
Take a look at a package like HoloView for Python - it supports big pictures with zoom in capabillity.
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My adviser told me to use Accord Framework for C# to extract features and patterns from images. Our project is about image analysis and comparison of tobacco leaves. Does anyone here have an idea on how to do it? Thank you.
This is pretty high level stuff, but from what I've learned in my time faffing with it, I'd use the Accord.Imaging library to scan your pictures. Followed by using the Accord.Neuro namespace to "learn" from some manual data you feed into it.
Seems your goal is to create a program that scans images quickly, gleaning only the useful data from the full image, and then checking for some particular features of the image. I've never used the library, but it looks like it'd be possible to use it.
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i have created an application using C# that has some forms with a lot of pictures and text. The problem is that the background image seems to be affecting the performance. it looks like processing or rendering to load the form and its noticeable even at a run time.
i already tried changing the background image but still it has that rendering look. i tried removing the entire background image and it runs smoothly without it.
i captured my screen here's a Link
As per #Taw,
This link explains form double buffering for your C# application.
It allows you to write to an off-screen buffer to prevent flickering and other graphical corruption from occuring while writing directly to a form. It is a very common technique in game and graphics development to allow very complex images to be created while prevent tearing, shearing, and other fun side effects that you can check out when you get a chance.
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I am implementing 2d-bin-packing algorithm in canvas. My task is to place rectangles as optimal as it can be on a canvas.
the following shows how to do it:
http://incise.org/2d-bin-packing-with-javascript-and-canvas.html
BUT, it starts with the origin. I would like to tell the algorithm where to put a rectangle and that the next one not to be on top of him.
What should be changed in the code?
Is there another algorithm to use for it?
I know a better algorithm(in terms of compactness, not speed) than the one you linked to is called MaxRects.
This was my implementation of it in C++. While not fast, it was very effective at packing compactly.
This is a pdf discussing and comparing all sorts of algorithms in terms of both time and compactness.
EDIT:
I threw together an example of an image packed using MaxRects .
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I have to develop a small application that gets some images and then counts the items in the image. It is something like a satellite image with a road and I need to count the cars.
Can you give me some hints where to start? I am completely lost.
Thanks a lot,
Radu
Have you checked out OpenCV? Emgu CV provides the .NET bindings
Image processing library:
OpenCV or if you have Matlab with the image processing toolbox it would be very nice.
Algorithm wise
Counting cars on a road is not as simple as it appears. Lets suppose they have a invariant scale (say 1.0).
Create yourself a Hough transform algo to vote for rectangles with about the same width and height as your cars.
In your vote buffer find the 'n' greatest vote scores and this is your number of cars.
This is not so complicated and OpenCV can be pretty useful. You can estimate the maximum value of your hough score for each car so you can set thresholds to skip outliers.