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Circle line-segment collision detection algorithm?
... exdx + eydy - dxh - dyk ) +
ex2 + ey2 -
2exh - 2eyk + h2 + k2 - r2 = 0
Finally,
t2( _d * _d ) + 2t( _e * _d - _d * _c ) + _e * _e - 2( _e*_c ) + _c * _c - r2 = 0
*Where _d is the vector d and * is the dot product.*
And then,
t2( _d * _d ) + 2t( _d * ( _e - _c ) ) + ( _e - _c ) * ( _e - _c ) - r2 = ...
What is the difference between shallow copy, deepcopy and normal assignment operation?
...ble towards the existing object. The docs explain the difference between shallow and deep copies:
The difference between shallow and deep copying is only relevant for
compound objects (objects that contain other objects, like lists or
class instances):
A shallow copy constructs a new...
How to [recursively] Zip a directory in PHP?
...ce), file_get_contents($source));
}
return $zip->close();
}
Call it like this:
Zip('/folder/to/compress/', './compressed.zip');
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Evaluating string “3*(4+2)” yield int 18 [duplicate]
...a framework function instead and got an interesting answer about using DataTable's Compute method: stackoverflow.com/questions/2859111/c-math-calculator/…
– Michael
Sep 28 '11 at 2:44
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How to lock orientation during runtime
Is there a way to lock orientation during runtime? For example I'd like to allow the user to lock the screen to landscape if the user currently in landscape and toggle the menu option.
...
Calculating sum of repeated elements in AngularJS ng-repeat
...tion, which is easy to understand here, but gets pretty messy with complex tables.
– Marc Durdin
Jul 30 '15 at 0:13
1
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What is the AppDelegate for and how do I know when to use it?
...cations) or a document singleton (for single document applications)
Button/table/view controllers, view delegate methods or other view handling (except for construction of the top-level view in applicationDidFinishLaunching:) -- this work should be in respective view controller classes.
Many peop...
Escaping ampersand in URL
...ter to 'escape' characters that aren't allowed in URLs. See [RFC 1738].
A table of ASCII values on http://www.asciitable.com/.
You can see & is 26 in hexadecimal - so you need M%26M.
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Best way to iterate through a Perl array
...ay elements occurs. ($_ is aliased to the element in #1, but #2 and #3 actually copy the scalars from the array.)
#5 might be similar.
In terms memory usage: They're all the same except for #5.
for (@a) is special-cased to avoid flattening the array. The loop iterates over the indexes of the array...
Qt: can't find -lGL error
I just reinstalled QtCreator, created new project ( Qt Application ) an got this after compilation:
8 Answers
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