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Drawing an image from a data URL to a canvas

...t('2d'); var img = new Image; img.onload = function(){ ctx.drawImage(img,0,0); // Or at whatever offset you like }; img.src = strDataURI; Edit: I previously suggested in this space that it might not be necessary to use the onload handler when a data URI is involved. Based on experimental tests f...
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FAQ Section: SMS - Frequently Asked Questions - MIT App Inventor Community

...imary: #222222; --secondary: #ffffff; --tertiary: #0088cc; --quaternary: #e45735; --highlight: #ffff4d; --success: #009900; } } /* then deal with dark scheme */ @media (prefers-color-scheme: dark) { ...
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How to write asynchronous functions for Node.js

...| edited Aug 1 '11 at 14:30 answered Aug 1 '11 at 13:20 Ray...
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How to send a simple string between two programs using pipes?

... "/tmp/myfifo"; /* create the FIFO (named pipe) */ mkfifo(myfifo, 0666); /* write "Hi" to the FIFO */ fd = open(myfifo, O_WRONLY); write(fd, "Hi", sizeof("Hi")); close(fd); /* remove the FIFO */ unlink(myfifo); return 0; } reader.c #include <fcntl.h> #i...
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Formatting a number with exactly two decimals in JavaScript

...ich rounds my numbers to two decimal places. But I get numbers like this: 10.8, 2.4, etc. These are not my idea of two decimal places so how I can improve the following? ...
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Evenly distributing n points on a sphere

...orithm that can give me positions around a sphere for N points (less than 20, probably) that vaguely spreads them out. There's no need for "perfection", but I just need it so none of them are bunched together. ...
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range() for floats

..., this could produce unpredictable results like: >>> list(frange(0, 100, 0.1))[-1] 99.9999999999986 To get the expected result, you can use one of the other answers in this question, or as @Tadhg mentioned, you can use decimal.Decimal as the jump argument. Make sure to initialize it with...
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Reliable way for a Bash script to get the full path to itself [duplicate]

... seems to mostly fit my "better" criteria: SCRIPTPATH="$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )" That SCRIPTPATH line seems particularly roundabout, but we need it rather than SCRIPTPATH=`pwd` in order to properly handle spaces and symlinks. The inclusion of output redirectio...
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How assignment works with Python list slice?

...g two distinct operation that use very similar syntax: 1) slicing: b = a[0:2] This makes a copy of the slice of a and assigns it to b. 2) slice assignment: a[0:2] = b This replaces the slice of a with the contents of b. Although the syntax is similar (I imagine by design!), these are two di...
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List comprehension on a nested list?

... answered Aug 6 '13 at 6:05 Andrew ClarkAndrew Clark 171k2525 gold badges236236 silver badges278278 bronze badges ...