Subversion Repositories eFlore/Applications.moissonnage

//#include "GPX.js"

(function() {

function d2h(d) {
        var hex = '0123456789ABCDEF';
        var r = '';
        d = Math.floor(d);
        while (d != 0) {
                r = hex[d % 16] + r;
                d = Math.floor(d / 16);
        }
        while (r.length < 2) r = '0' + r;
        return r;
}

function gradient(color) {
        // First arc (0, PI) in HSV colorspace
        function f2h(d) { return d2h(256 * d); }
        if (color < 0)
                return "#FF0000";
        else if (color < 1.0/3)
                return "#FF" + f2h(3 * color) + "00";
        else if (color < 2.0/3)
                return "#" + f2h(2 - 3 * color) + "FF00";
        else if (color < 1)
                return "#00FF" + f2h(3 * color - 2);
        else
                return "#00FFFF";
};

function gpx2time(s) {
        // 2011-09-24T12:07:53Z
        if (s.length != 10 + 1 + 8 + 1)
                return new Date();
        return new Date(s);
};

L.GPX.include({
        options: {
                maxSpeed: 110,
                chunks: 200
        },

        speedSplitEnable: function(options) {
                L.Util.setOptions(this, options);
                return this.on('addline', this.speed_split, this);
        },

        speedSplitDisable: function() {
                return this.off('addline', this.speed_split, this);
        },

        speed_split: function(e) {
                var l = e.line.pop(), ll = l.getLatLngs();
                var chunk = Math.floor(ll.length / this.options.chunks);
                if (chunk < 3) chunk = 3;
                var p = null;
                for (var i = 0; i < ll.length; i += chunk) {
                        var d = 0, t = null;
                        if (i + chunk > ll.length)
                                chunk = ll.length - i;
                        for (var j = 0; j < chunk; j++) {
                                if (p) d += p.distanceTo(ll[i+j]);
                                p = ll[i + j];
                                if (!t) t = gpx2time(p.meta.time);
                        }
                        p = ll[i + chunk - 1];
                        t = (gpx2time(p.meta.time) - t) / (3600 * 1000);
                        var speed = 0.001 * d / t;
                        //console.info('Dist: ' + d + "; Speed: " + speed);
                        var color = gradient(speed / this.options.maxSpeed);
                        var l = new L.Polyline(ll.slice(i, i+chunk+1), {color: color, weight: 2, opacity: 1});
                        l.bindPopup('Dist: ' + d.toFixed() + "m; Speed: " + speed.toFixed(2) + " km/h");
                        e.line.push(l);
                }
        }

});
})();