D3.js

/**
 * # D3
 * Copyright(c) 2015 Stefano Balietti
 * MIT Licensed
 *
 * Integrates nodeGame with the D3 library to plot a real-time chart
 *
 * www.nodegame.org
 */
(function(node) {

    "use strict";

    node.widgets.register('D3', D3);
    node.widgets.register('D3ts', D3ts);

    D3.prototype.__proto__ = node.Widget.prototype;
    D3.prototype.constructor = D3;

    // ## Defaults

    D3.defaults = {};
    D3.defaults.id = 'D3';
    D3.defaults.fieldset = {
        legend: 'D3 plot'
    };


    // ## Meta-data

    D3.version = '0.1';
    D3.description = 'Real time plots for nodeGame with d3.js';

    // ## Dependencies

    D3.dependencies = {
        d3: {},
        JSUS: {}
    };

    function D3 (options) {
        this.id = options.id || D3.id;
        this.event = options.event || 'D3';
        this.svg = null;

        var that = this;
        node.on(this.event, function(value) {
            that.tick.call(that, value);
        });
    }

    D3.prototype.append = function(root) {
        this.root = root;
        this.svg = d3.select(root).append("svg");
        return root;
    };

    D3.prototype.tick = function() {};

    // # D3ts


    // ## Meta-data

    D3ts.id = 'D3ts';
    D3ts.version = '0.1';
    D3ts.description = 'Time series plot for nodeGame with d3.js';

    // ## Dependencies
    D3ts.dependencies = {
        D3: {},
        JSUS: {}
    };

    D3ts.prototype.__proto__ = D3.prototype;
    D3ts.prototype.constructor = D3ts;

    D3ts.defaults = {};

    D3ts.defaults.width = 400;
    D3ts.defaults.height = 200;

    D3ts.defaults.margin = {
        top: 10,
        right: 10,
        bottom: 20,
        left: 40
    };

    D3ts.defaults.domain = {
        x: [0, 10],
        y: [0, 1]
    };

    D3ts.defaults.range = {
        x: [0, D3ts.defaults.width],
        y: [D3ts.defaults.height, 0]
    };

    function D3ts(options) {
        var o, x, y;
        D3.call(this, options);

        this.options = o = J.merge(D3ts.defaults, options);
        this.n = o.n;
        this.data = [0];

        this.margin = o.margin;

        this.width = o.width - this.margin.left - this.margin.right;
        this.height = o.height - this.margin.top - this.margin.bottom;

        // Identity function.
        this.x = x = d3.scale.linear()
            .domain(o.domain.x)
            .range(o.range.x);

        this.y = y = d3.scale.linear()
            .domain(o.domain.y)
            .range(o.range.y);

        // line generator
        this.line = d3.svg.line()
            .x(function(d, i) { return x(i); })
            .y(function(d, i) { return y(d); });
    }

    D3ts.prototype.init = function(options) {
        //D3.init.call(this, options);

        console.log('init!');
        var x = this.x,
        y = this.y,
        height = this.height,
        width = this.width,
        margin = this.margin;


        // Create the SVG and place it in the middle
        this.svg.attr("width", width + margin.left + margin.right)
            .attr("height", height + margin.top + margin.bottom)
            .append("g")
            .attr("transform", "translate(" + margin.left + "," + margin.top +
                  ")");


        // Line does not go out the axis
        this.svg.append("defs").append("clipPath")
            .attr("id", "clip")
            .append("rect")
            .attr("width", width)
            .attr("height", height);

        // X axis
        this.svg.append("g")
            .attr("class", "x axis")
            .attr("transform", "translate(0," + height + ")")
            .call(d3.svg.axis().scale(x).orient("bottom"));

        // Y axis
        this.svg.append("g")
            .attr("class", "y axis")
            .call(d3.svg.axis().scale(y).orient("left"));

        this.path = this.svg.append("g")
            .attr("clip-path", "url(#clip)")
            .append("path")
            .data([this.data])
            .attr("class", "line")
            .attr("d", this.line);
    };

    D3ts.prototype.tick = function(value) {
        this.alreadyInit = this.alreadyInit || false;
        if (!this.alreadyInit) {
            this.init();
            this.alreadyInit = true;
        }

        var x = this.x;

        console.log('tick!');

        // push a new data point onto the back
        this.data.push(value);

        // redraw the line, and slide it to the left
        this.path
            .attr("d", this.line)
            .attr("transform", null);

        // pop the old data point off the front
        if (this.data.length > this.n) {

            this.path
                .transition()
                .duration(500)
                .ease("linear")
                .attr("transform", "translate(" + x(-1) + ")");

            this.data.shift();

        }
    };

})(node);