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What's the best way to set a single pixel in an HTML5 canvas?
...;
d[3] = a;
myContext.putImageData( id, x, y );
Use fillRect() to draw a pixel (there should be no aliasing issues):
ctx.fillStyle = "rgba("+r+","+g+","+b+","+(a/255)+")";
ctx.fillRect( x, y, 1, 1 );
You can test the speed of these here: http://jsperf.com/setting-canvas-pixel/9 or here h...
How do I pass a unique_ptr argument to a constructor or a function?
...bject pointed to, or by what means that ownership is managed, so passing a raw pointer is both perfectly safe, and the most flexible form, since regardless of ownership a client can always produce a raw pointer (either by calling the get method or from the address-of operator &).
For instance t...
Should sorting logic be placed in the model, the view, or the controller? [closed]
...everything but the sorting logic to a single third model. docs.google.com/drawings/d/…
– rightfold
Dec 11 '15 at 14:03
...
A top-like utility for monitoring CUDA activity on a GPU
... combines this information, but you can use the nvidia-smi tool to get the raw data, like so (thanks to @jmsu for the tip on -l):
$ nvidia-smi -q -g 0 -d UTILIZATION -l
==============NVSMI LOG==============
Timestamp : Tue Nov 22 11:50:05 2011
Driver Version ...
How to break out of a loop from inside a switch?
...r.
Otherwise, stop looping forever.
End.
Code
while True:
choice = raw_input('What do you want? ')
if choice == 'restart':
continue
else:
break
print 'Break!'
Versus:
Initialize the user's choice.
Loop while the user's choice is the word 'restart'.
Ask the user...
Can you do greater than comparison on a date in a Rails 3 search?
...in cases where you merge models which both have a user_id field. Using the raw SQL notation means you need to include the table clarifications yourself, eg: where("notes.user_id = ?",current_user.id).
– DreadPirateShawn
Jul 13 '14 at 10:03
...
boost Composite keys - C/C++ - 清泛网 - 专注C/C++及内核技术
...call chained pointers. Such a chained pointer is defined by induction as a raw or smart pointer or iterator to the actual element, to a reference wrapper of the element or to another chained pointer; that is, chained pointers are arbitrary compositions of pointer-like types ultimately dereferencing ...
Type erasure techniques
...
I would also consider (similar to void*) the use of "raw storage": char buffer[N].
In C++0x you have std::aligned_storage<Size,Align>::type for this.
You can store anything you want in there, as long as it's small enough and you deal with the alignment properly.
...
Abusing the algebra of algebraic data types - why does this work?
...ncept here. That quickly leads us to enumerative combinatorics, and if you consult the linked Wikipedia article you'll find that one of the first things it does is define "pairs" and "unions" in exactly the same sense as product and sum types by way of generating functions, then does the same for "s...
How to 'minify' Javascript code
... HTTP::Request;
use Fcntl;
my %api = ( css => 'https://cssminifier.com/raw', js => 'https://javascript-minifier.com/raw' );
my $DEBUG = 0;
my @files = @ARGV;
unless ( scalar(@files) ) {
die("Filename(s) not specified");
}
my $ua = LWP::UserAgent->new;
foreach my $file (@files) {
...