runs3d.js

var Canvas = require('canvas'),
    fs = require('fs'),
    Pre3d = require('./pre3d'),
    w = 1280,
    h = 800,
    c = new Canvas(w, h),
    ctx = c.getContext('2d');


var td = 'json/tcx/';
var tweets = fs.readdirSync(td);
var t = tweets.map(function(t) {
    return JSON.parse(fs.readFileSync(td + t, 'utf8'));
}).filter(function(t) {
    return t.features.length > 0 && t.features[0].bpm;
});

var fgcolor = new Pre3d.RGBA(1, 0, 0, 1);
var renderer = new Pre3d.Renderer(c);
renderer.ctx.lineWidth = 1;

var paths = [];
for (var j = 0; j < t.length; j++) {
    var features = t[j].features;
    var path = new Pre3d.Path();
    path.points = [];
    path.curves = [];
    path.starting_point = 0;

    for (var i = 0; i < features.length - 1; i++) {
        path.points.push({
            x: (2 * (j / t.length)) - 0.5,
            z: (i / 500) - 1,
            y: (features[i].alt / 300) - 0.3
        });
        path.curves.push(new Pre3d.Curve(i, i, i));
    }
    paths.push(path);
}

var camera_state = {"rotate_x":0.5,"rotate_y":0.5,"rotate_z":0,"x":0,"y":0,"z":-3 };
function set_camera() {
          var ct = renderer.camera.transform;
      ct.reset();
      ct.rotateZ(camera_state.rotate_z);
      ct.rotateY(camera_state.rotate_y);
      ct.rotateX(camera_state.rotate_x);
      ct.translate(camera_state.x, camera_state.y, camera_state.z);
}
    renderer.camera.focal_length = 3.5;

for (var n = 0; n < 20; n++) {
    if (n < 10) {
        camera_state.rotate_y += (Math.PI * 2) / 90;
    } else {
        camera_state.rotate_y -= (Math.PI * 2) / 90;
    }

    set_camera();
    renderer.ctx.setFillColor(0.97, 0.97, 0.97, 1);
    renderer.drawBackground();

    for (var j = 0; j < paths.length; j += 2) {
        if (j % 4 === 0) {
            renderer.ctx.setStrokeColor(0.5, 0.7, 0.6, 1);
        } else {
            renderer.ctx.setStrokeColor(0.7, 0.2, 0.6, 1);
        }
        renderer.drawPath(paths[j]);
    }

    if (n < 10) {
        fs.writeFileSync('3ds/3d_0' + n + '.png', c.toBuffer());
    } else {
        fs.writeFileSync('3ds/3d_' + n + '.png', c.toBuffer());
    }
}