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How to get a pixel's x,y coordinate color from an image?
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Building on Jeff's answer, your first step would be to create a canvas representation of your PNG. The following creates an off-screen canvas that is the same width and height as your image and has the image drawn on it.
var img = document.getElementById('my-image');
var canvas = docume...
What is the purpose of the “Prefer 32-bit” setting in Visual Studio and how does it actually work?
...n “Any CPU 32-bit preferred” and “x86” is
only this: a .NET application compiled to x86 will fail to run on an
ARM Windows system, but an “Any CPU 32-bit preferred” application will
run successfully.
share...
In absence of preprocessor macros, is there a way to define practical scheme specific flags at proje
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In Swift you can still use the "#if/#else/#endif" preprocessor macros (although more constrained), as per Apple docs. Here's an example:
#if DEBUG
let a = 2
#else
let a = 3
#endif
Now, you must set the "DEBUG" symbol elsewhere,...
Does a const reference class member prolong the life of a temporary?
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Only local const references prolong the lifespan.
The standard specifies such behavior in §8.5.3/5, [dcl.init.ref], the section on initializers of reference declarations. The reference in your example is bound to the constructor's...
visual c++: #include files from other projects in the same solution
...nclude "filename.h"
Note that you don't need to specify the path here, because you include the directory in the Additional Include Directories already, so Visual Studio will know where to look for it.
If you don't want to add every header file location in the project settings, you could just incl...
In SQL Server, when should you use GO and when should you use semi-colon ;?
...lly.
The ; is a SQL statement delimiter, but for the most part the engine can interpret where your statements are broken up.
The main exception, and place where the ; is used most often is before a Common Table Expression Statement.
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“Diff” an image using ImageMagick
How can I get the difference between two images? I have the original image. Someone has written on an exact duplicate of the original image. Now, I need to compare the original to the written on image and extract just the writing in image format.
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What does gcc's ffast-math actually do?
I understand gcc's --ffast-math flag can greatly increase speed for float ops, and goes outside of IEEE standards, but I can't seem to find information on what is really happening when it's on. Can anyone please explain some of the details and maybe give a clear example of how something would chan...
Master-master vs master-slave database architecture?
...y is out of the water, and if people are remote then may pay horrid communication costs. Bring portable devices, which may need to operate disconnected, into the picture and one copy won't cut it.
Master Slave: consistency is not too difficult because each piece of data has exactly one owning maste...
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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