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How do I calculate the normal vector of a line segment?
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if we define dx=x2-x1 and dy=y2-y1, then the normals are (-dy, dx) and (dy, -dx).
Note that no division is required, and so you're not risking dividing by zero.
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Setting a timeout for socket operations
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Use the Socket() constructor, and connect(SocketAddress endpoint, int timeout) method instead.
In your case it would look something like:
Socket socket = new Socket();
socket.connect(new InetSocketAddress(ipAddress, port), 1000);
Quoting from the do...
How to convert `git:` urls to `http:` urls
I'm working behind an http proxy. I'm trying to clone Android's source tree using their "repo" tool.
4 Answers
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CSS attribute selector does not work a href
I need to use attribute selector in css to change link on different color and image, but it does not work.
2 Answers
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PostgreSQL naming conventions
...sitively when not quoted (it actually folds them to lowercase internally), and case sensitively when quoted; many people are not aware of this idiosyncrasy. Using always lowercase you are safe. Anyway, it's acceptable to use camelCase or PascalCase (or UPPER_CASE), as long as you are consistent: eit...
How to detect if my shell script is running through a pipe?
How do I detect from within a shell script if its standard output is being sent to a terminal or if it's piped to another process?
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How to negate the whole regex?
I have a regex, for example (ma|(t){1}) . It matches ma and t and doesn't match bla .
4 Answers
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What is the difference between connection and read timeout for sockets?
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1) What is the difference between connection and read timeout for sockets?
The connection timeout is the timeout in making the initial connection; i.e. completing the TCP connection handshake. The read timeout is the timeout on waiting to read data1. Specifically, i...
What is a .h.gch file?
...t to generate pre-compiled headers it will make them if they don’t exist and use them in the next build.
Sometimes the *.h.gch will get corrupted or contain outdated information, so deleting that file and compiling it again should fix it.
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Create a Path from String in Java7
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Is there a way for this to work with relative path and full path? i.e giving a path relative to where the project or exe is?
– shinzou
Aug 14 '16 at 17:07
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