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How to calculate the angle between a line and the horizontal axis?
...2(deltaY, deltaX) * 180 / PI
EDIT (Feb. 22, 2017): In general, however, calling atan2(deltaY,deltaX) just to get the proper angle for cos and sin may be inelegant. In those cases, you can often do the following instead:
Treat (deltaX, deltaY) as a vector.
Normalize that vector to a unit vector. ...
Chrome Developer Tools: How to find out what is overriding a CSS rule?
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what if ALL of them are cancelled? Probably due to a script? How do you find out who did it?
– darkgaze
Jun 23 '17 at 8:28
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Multiline strings in JSON
I'm writing some data files in JSON format and would like to have some really long string values split over multiple lines. Using python's JSON module I get a whole lot of errors, whether I use \ or \n as an escape.
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ERROR 2006 (HY000): MySQL server has gone away
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max_allowed_packet=64M
Adding this line into my.cnf file solves my problem.
This is useful when the columns have large values, which cause the issues, you can find the explanation here.
On Windows this file is located at: ...
Does the GitHub traffic graph include your own views?
I have several projects on GitHub, and they all have the traffic graph where I can view how much traffic my repository is getting.
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Automatic creation date for Django model form objects?
What's the best way to set a creation date for an object automatically, and also a field that will record when the object was last updated?
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Changing Ctrl + Tab behavior for moving between documents in Visual Studio
...n Visual Studio 2015 (as well as previous versions of VS, but you must install Productivity Power Tools if you're using VS2013 or below), there are two new commands in Visual Studio:
Window.NextTab and
Window.PreviousTab
Just go remap them from Ctrl+Alt+PageUp/Ctrl+Alt+PageDown to Ctrl+Tab/Ctrl+...
Convert to/from DateTime and Time in Ruby
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Unfortunately this only really works when dealing with local times. If you start with a DateTime or Time with a different timezone, the parse function will convert into local timezone. You basically lose the original timezone.
– ...
CSS attribute selector does not work a href
...a query string or hash fragment. If we combine the 3 cases we should match all pdf links.
a[href$='.pdf'], a[href*='.pdf?'], a[href*='.pdf#'] {
background: red;
}
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Error 'LINK : fatal error LNK1123: failure during conversion to COFF: file invalid or corrupt' after
I've installed Visual Studio 2012 Release Preview, and it appears to be fine, but now when I try to use Visual Studio 2010 to compile C++ projects, I get the following error message:
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