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How to get a pixel's x,y coordinate color from an image?
...http://jsfiddle.net/thirtydot/9SEMf/869/ I used jQuery for convenience in all of this, but it is by no means required.
Note: getImageData falls under the browser's same-origin policy to prevent data leaks, meaning this technique will fail if you dirty the canvas with an image from another domain o...
Disable hover effects on mobile browsers
...er and mouseout) are fired, and add and remove the hover.
If the user actually clicks a link, the hover effect is also removed. This ensure that it is removed if the user presses the back button in the web browser.
This also works for touch events: on touchstart the hover effect is added. It is ''...
“Diff” an image using ImageMagick
... as a PNG file, the second one as a PDF.
The resulting diff file displays all pixels which are different in red color. The ones which are unchanged appear white.
Short and sweet.
Note, your images need not be the same type. You can even mix JPEG, TIFF, PNG -- under one condition: the images sho...
Why escape_javascript before rendering a partial?
I'm looking at this Railscast episode and wondering why the call to escape_javascript is needed here:
4 Answers
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call a static method inside a class?
how do i call a static method from another method inside the same class?
4 Answers
4
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Can you use hash navigation without affecting history?
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Totally the way to go for modern browsers; be aware of the partial support session history management has though.
– Matt
Oct 19 '14 at 16:43
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How to choose the id generation strategy when using JPA and Hibernate
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The API Doc are very clear on this.
All generators implement the interface org.hibernate.id.IdentifierGenerator. This is a very simple interface. Some applications can choose to provide their own specialized implementations, however, Hibernate provides a range ...
How to implement the activity stream in a social network
...stream for any user and then grab the related data from the db as needed. Fall back to querying the db by time if the user needs to browse far back in time (if you even offer this)
I use a plain old MySQL table for dealing with about 15 million activities.
It looks something like this:
id ...
Understanding dispatch_async
... suggest but somehow, the uiTableViewCell doesn'tupdate right away when I call [self.tableView reloadData] in the Run UI Updates. It takes about 4 or 5 seconds. It's been driving me crazy for several days now.
– GrandSteph
Sep 16 '14 at 15:26
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Why is the Java main method static?
...c because otherwise there would be ambiguity: which constructor should be called? Especially if your class looks like this:
public class JavaClass{
protected JavaClass(int x){}
public void main(String[] args){
}
}
Should the JVM call new JavaClass(int)? What should it pass for x?
If not,...