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Convert RGB to RGBA over white
...ex color, e.g. #F4F8FB (or rgb(244, 248, 251) ) that I want converted into an as-transparent-as-possible rgba color (when displayed over white). Make sense? I'm looking for an algorithm, or at least idea of an algorithm for how to do so.
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Apache POI Excel - how to configure columns to be expanded?
I am using Apache POI API to generate excel spreadsheet to output some data.
11 Answers
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Automatic post-registration user authentication
...re building a business app from the ground up in Symfony 2, and I've run into a bit of a snag with the user registration flow: after the user creates an account, they should be automatically logged in with those credentials, instead of being immediately forced to provide their credentials again.
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How do I create a nice-looking DMG for Mac OS X using command-line tools?
I need to create a nice installer for a Mac application. I want it to be a disk image (DMG), with a predefined size, layout and background image.
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Structure padding and packing
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Padding aligns structure members to "natural" address boundaries - say, int members would have offsets, which are mod(4) == 0 on 32-bit platform. Padding is on by default. It inserts the following "gaps" into your first structure:
struct mystruct_A {
ch...
Sound effects in JavaScript / HTML5
I'm using HTML5 to program games; the obstacle I've run into now is how to play sound effects.
18 Answers
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Emacs, switch to previous window
In Emacs, C-x o takes me to the next window.
12 Answers
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My Git repository is in the wrong root directory. Can I move it? (../ instead of ./)
... init ed my latest project a month or so ago I ran the command in the directory one directory higher than the root of my project.
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What is the best collation to use for MySQL with PHP? [closed]
...ish_ci) contain additional language rules that make them the most accurate to sort for those languages. Most of the time I use utf8_unicode_ci (I prefer accuracy to small performance improvements), unless I have a good reason to prefer a specific language.
You can read more on specific unicode char...
Converting datetime.date to UTC timestamp in Python
I am dealing with dates in Python and I need to convert them to UTC timestamps to be used
inside Javascript. The following code does not work:
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