| // modified from answers on http://stackoverflow.com/questions/5433806/convert-embedded-svg-to-png-in-place | |
| // Takes an SVG element as target | |
| function svg_to_png_data(target) { | |
| var ctx, mycanvas, svg_data, img, child; | |
| // Construct an SVG image | |
| var new_width = target.width.baseVal.valueInSpecifiedUnits; | |
| var new_height = target.height.baseVal.valueInSpecifiedUnits; |
| /* public.plv8_startup() | |
| * | |
| * Allow to have multiple per-schema plv8_init functions. | |
| * | |
| * USAGE: | |
| * | |
| * 1. Add the following line to the end of your postgresql.conf file: | |
| * | |
| * plv8.start_proc = 'public.plv8_startup' | |
| * |
| // Returns the value at a given percentile in a sorted numeric array. | |
| // "Linear interpolation between closest ranks" method | |
| function percentile(arr, p) { | |
| if (arr.length === 0) return 0; | |
| if (typeof p !== 'number') throw new TypeError('p must be a number'); | |
| if (p <= 0) return arr[0]; | |
| if (p >= 1) return arr[arr.length - 1]; | |
| var index = (arr.length - 1) * p, | |
| lower = Math.floor(index), |
Listen / Notify for automatic object updates - pattern in postgreSQL Presented at the San Francsico PostgreSQL User Group Meetup 8/17/15
by Eric Eslinger [email protected] github.com/ericeslinger
This example uses listen/notify calls in PostgreSQL that trigger on row update to pass events from the database to a listening node.js web application that in turn uses socket.io to pass events
| #!/bin/bash | |
| # vmtouchpoll: Keep some files locked in memory (including new files, dropping deleted files) | |
| # Usage: vmtouchpoll '/path/to/some/files/*.idx' | |
| # Works by periodically restarting vmtouch with a new set of files | |
| # Implemented by Vitaly "_Vi" Shukela in 2015, License=MIT | |
Hi Nicholas,
I saw you tweet about JSX yesterday. It seemed like the discussion devolved pretty quickly but I wanted to share our experience over the last year. I understand your concerns. I've made similar remarks about JSX. When we started using it Planning Center, I led the charge to write React without it. I don't imagine I'd have much to say that you haven't considered but, if it's helpful, here's a pattern that changed my opinion:
The idea that "React is the V in MVC" is disingenuous. It's a good pitch but, for many of us, it feels like in invitation to repeat our history of coupled views. In practice, React is the V and the C. Dan Abramov describes the division as Smart and Dumb Components. At our office, we call them stateless and container components (view-controllers if we're Flux). The idea is pretty simple: components can't
First experiments with NodeMCU to publish the current settings of my adjustable height working desk to MQTT.
NodeMCU can be found here: https://github.com/nodemcu/nodemcu-firmware
Note that you'll need a current version with support for floats (which the ultrasonic sensor library utilizes), I'm using 0.9.5 2015-03-18 with float support myself.
Support for the HC-SR04 sensor in NodeMCU can be found here: https://github.com/sza2/node_hcsr04
I provided my slightly adjusted version which makes measuring a non-blocking afair, allowing for callbacks when the measurement completes.
This gist lets you keep IPython notebooks in git repositories. It tells git to ignore prompt numbers and program outputs when checking that a file has changed.
To use the script, follow the instructions given in the script's docstring.
For further details, read this blogpost.
The procedure outlined here is inspired by this answer on Stack Overflow.
Upload a GTFS file that contains shapes.txt. Example GTFS files can be found at TransitFeeds.
| // Handy plv8 console object (debugging) | |
| var console = (function(){ | |
| var columns = 100; | |
| function logString(level, str) { | |
| var chunk = str.substring(0, columns); | |
| var overflow = str.substring(columns); | |
| plv8.elog(level, chunk); | |
| if (overflow.length) logString(level, " | "+overflow); | |
| }; |
