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When to use PNG or JPG in iPhone development?
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PNG's are pixel perfect (non-lossy), and require very little extra CPU energy to display. However, large PNGs may take longer to read from storage than more compressed image formats, and thus be slower to display.
JPG's are smaller to store, but lossy (amount ...
What exactly do the Vagrant commands do?
There is surprisingly no documentation on what the Vagrant commands do, other than references throughout the "getting started" tutorial.
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How to exit from the application and show the home screen?
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Android's design does not favor exiting an application by choice, but rather manages it by the OS. You can bring up the Home application by its corresponding Intent:
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.add...
How can I delete all unversioned/ignored files/folders in my working copy?
...te all unversioned or ignored files in that working copy with a single command or tool? Essentially, I'm looking for the SVN analogue to git clean .
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Get a pixel from HTML Canvas?
....getContext('2d');
// Get the CanvasPixelArray from the given coordinates and dimensions.
var imgd = context.getImageData(x, y, width, height);
var pix = imgd.data;
// Loop over each pixel and invert the color.
for (var i = 0, n = pix.length; i < n; i += 4) {
pix[i ] = 255 - pix[i ]; // r...
How do I write JSON data to a file?
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You forgot the actual JSON part - data is a dictionary and not yet JSON-encoded. Write it like this for maximum compatibility (Python 2 and 3):
import json
with open('data.json', 'w') as f:
json.dump(data, f)
On a modern system (i.e. Python 3 and UTF-8 support), you can wr...
Fast way of counting non-zero bits in positive integer
...1") is the fastest I could find in pure Python.
I tried adapting Óscar's and Adam's solutions to process the integer in 64-bit and 32-bit chunks, respectively. Both were at least ten times slower than bin(n).count("1") (the 32-bit version took about half again as much time).
On the other hand, gm...
How to choose the id generation strategy when using JPA and Hibernate
I was going through Id generation section of the Hibernate reference guide and "java persistence with Hibernate"
4 Answers
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SQL server query to get the list of columns in a table along with Data types, NOT NULL, and PRIMARY
... of columns in a particular table, its associated data types (with length) and if they are not null. And I have managed to do this much.
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How can I extract embedded fonts from a PDF as valid font files?
...f the pdftk.exe utility that can indicate which fonts are used by a PDF, and wether they are embedded or not.
8 Answers
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