synaptic-touch-averager.js

#!/usr/bin/env nodejs

var x = [];
var y = [];

var buffer = "";
require("child_process").spawn("evemu-record", {stdio: [process.stdin, "pipe", process.stderr]}).stdout.on("data", function (data) {
    buffer += data.toString();
    if (buffer.indexOf("\n") >= 0) {
        var lines = buffer.split("\n");
        buffer = lines.pop();
        
        for (var l = 0; l < lines.length; ++l) {
            var match = lines[l].match(/ ABS_([XY]) +([0-9]+)$/);
            if (!match)
                continue;
            
            if (match[1] === "X")
                x.push(parseInt(match[2]));
            else if (match[1] === "Y")
                y.push(parseInt(match[2]));
        }
    }
});

process.on("SIGINT", function () {
    var avgX = x.reduce(function (avg, x, n) { return avg + (x - avg) / (n + 1); }, 0);
    var avgY = y.reduce(function (avg, y, n) { return avg + (y - avg) / (n + 1); }, 0);
    console.log("Counted:", x.length, y.length);
    console.log("Average:", avgX, avgY);
    console.log("Max:", Math.max.apply(Math, x), Math.max.apply(Math, y));
    console.log("Min:", Math.min.apply(Math, x), Math.min.apply(Math, y));
    process.exit(0);
});