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lengstrom / doSegmentsIntersect.js
Created January 19, 2014 01:46
Algorithm for checking whether two line segments intersect, written in Javascript.
function intersect(x1, y1, x2, y2, x3, y3, x4, y4){
var a1, a2, b1, b2, c1, c2;
var r1, r2 , r3, r4;
var denom, offset, num;
// Compute a1, b1, c1, where line joining points 1 and 2
// is "a1 x + b1 y + c1 = 0".
a1 = y2 - y1;
b1 = x1 - x2;
c1 = (x2 * y1) - (x1 * y2);
@lengstrom
lengstrom / server.js
Created February 1, 2014 01:41
Simple node.js static http file server
var app = require('http').createServer(handler), fs = require('fs');
var port = Number(process.env.PORT || 5000);
app.listen(port, function() {
console.log("Listening on " + port);
});
function handler(req, res) {
fs.readFile(__dirname + req['url'], function(err, data) {
@lengstrom
lengstrom / readDigitalInputs.c
Last active August 29, 2015 13:57
Reading digital inputs off of a HiTechnic Superpro Prototype Sensor
#pragma config(Sensor, S1, HTSPB, sensorI2CCustom9V)
///Requires Xander's drivers
#include "drivers/hitechnic-superpro.h"
task main() {
HTSPBsetupIO(HTSPB, 0x3F);
while(true) {
nxtDisplayTextLine(1, "B0: %d", HTSPBreadIO(HTSPB, 0x00));
@lengstrom
lengstrom / gist:fa642108661972745584bee168bf930b
Created June 19, 2016 04:44
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