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Calculate distance between two latitude-longitude points? (Haversine formula)
...over the earth’s surface – using the
‘Haversine’ formula.
function getDistanceFromLatLonInKm(lat1,lon1,lat2,lon2) {
var R = 6371; // Radius of the earth in km
var dLat = deg2rad(lat2-lat1); // deg2rad below
var dLon = deg2rad(lon2-lon1);
var a =
Math.sin(dLat/2) * Math.sin...
How to save a BufferedImage as a File
...
File outputfile = new File("image.jpg");
ImageIO.write(bufferedImage, "jpg", outputfile);
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Why is “using namespace std;” considered bad practice?
...and Quux() from Bar without problems. But one day you upgrade to a new version of Foo 2.0, which now offers a function called Quux(). Now you've got a conflict: Both Foo 2.0 and Bar import Quux() into your global namespace. This is going to take some effort to fix, especially if the function paramet...
Xcode changes unmodified storyboard and XIB files
...n the .storyboard file has its starting <document> tag's toolsVersion and systemVersion attributes altered by whatever configuration the most recent file manipulator happens to be running. Synchronizing everybody's Xcode versions precisely seems to help with toolsVersion , but systemVe...
How to redirect stderr and stdout to different files in the same line in script?
...d 2> error 1> output if you do not want to append.
Just for completion's sake, you can write 1> as just > since the default file descriptor is the output. so 1> and > is the same thing.
So, command 2> error 1> output becomes, command 2> error > output
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How do I provide JVM arguments to VisualVM?
...DK_HOME%\lib\visualvm\etc\visualvm.conf
Xms and Xmx are in the default_options line.
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d3 axis labeling
... simply by adding an SVG text element. A good example of this is my recreation of Gapminder’s animated bubble chart, The Wealth & Health of Nations. The x-axis label looks like this:
svg.append("text")
.attr("class", "x label")
.attr("text-anchor", "end")
.attr("x", width)
.at...
How can I do something like a FlowLayout in Android?
...arn how to do it yourself. During the talk I wrote a FlowLayout implementation live on stage to show how simple it is to write custom layouts.
The implementation is hosted here.
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How do I mock an open used in a with statement (using the Mock framework in Python)?
...ng open as a context manager (from the examples page in the mock documentation):
>>> open_name = '%s.open' % __name__
>>> with patch(open_name, create=True) as mock_open:
... mock_open.return_value = MagicMock(spec=file)
...
... with open('/some/path', 'w') as f:
... ...
Embedding SVG into ReactJS
...er support for SVG (source). You just need to apply some syntax transformations to make it JSX compatible, like you already have to do for HTML (class → className, style="color: purple" → style={{color: 'purple'}}). For any namespaced (colon-separated) attribute, e.g. xlink:href, remove the : an...