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Get distance between two points in canvas
I have canvas drawing tab and want lineWidth to be based on distance between two last mousemove coordinate updates. I will make translation of distance to width myself, I just need to know how to get distance between those points (I already have coordinates of those pointes).
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Query for array elements inside JSON type
...'m trying to test out the json type in PostgreSQL 9.3.
I have a json column called data in a table called reports . The JSON looks something like this:
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Prevent RequireJS from Caching Required Scripts
RequireJS seems to do something internally that caches required javascript files. If I make a change to one of the required files, I have to rename the file in order for the changes to be applied.
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Use of Java's Collections.singletonList()?
... a bit faster and/or save a bit of memory, but it is unlikely that these small savings will be significant. (An application that creates vast numbers of singleton lists is unusual to say the least.)
How does immutability play a role here?
It is part of the specification of the method; see ab...
Prevent strace from abbreviating arguments?
I'm trying to use strace to find out what commands a program executes using execve . Some of the arguments in these commands are quite long, and strace is abbreviating the arguments to execve (I see "..." after about 30 characters), preventing me from getting any useful information. How can I get...
How can I delete the current line in Emacs?
What is the emacs equivalent of vi's dd ? I want to delete the current line. Tried CTRL + k but it only deletes from current position.
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Java 8 Stream and operation on arrays
I have just discovered the new Java 8 stream capabilities. Coming from Python, I was wondering if there was now a neat way to do operations on arrays like summing, multiplying two arrays in a "one line pythonic" way ?
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How to export a Vagrant virtual machine to transfer it
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You have two ways to do this, I'll call it dirty way and clean way:
1. The dirty way
Create a box from your current virtual environment, using vagrant package command:
http://docs.vagrantup.com/v2/cli/package.html
Then copy the box to the other pc, add it u...
Transform DateTime into simple Date in Ruby on Rails
I have a datetime column in db that I want to transform into a simple date when I show it to users.
6 Answers
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How to set 'auto' for upper limit, but keep a fixed lower limit with matplotlib.pyplot
...d 'auto' and 'autorange', but those don't seem to work. Thank you in advance.
5 Answers
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