SGH / COMPONENTS

<!--
@license
    The MIT License (MIT)

    Copyright (c) 2015 Dipartimento di Informatica - Università di Salerno - Italy

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
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<!--
* Developed by :
* ROUTE-TO-PA Project - grant No 645860. - www.routetopa.eu
*
-->

<link rel="import" href="../base-datalet/base-datalet.html">
<link rel="import" href="../../bower_components/iron-flex-layout/iron-flex-layout.html">
<link rel="import" href="../../bower_components/paper-dialog/paper-dialog.html">
<link rel="import" href="../../bower_components/paper-fab/paper-fab.html">

<!--
`preview-datalet` is a datalet that allow user to preview the content of a web page. It creates a thumbnail of the site using the data-url attribute passed as input.

Example:

    <preview-datalet data-url="http://spod.routetopa.eu"
    </preview-datalet>


@element preview-datalet
@status beta
@homepage
@group datalets
-->

<dom-module id="graph-clustering-datalet">
    <template>

        <link rel="stylesheet" href="static/css/graphClusteringStyle.css">

        <style is="custom-style">

            #dialog{
                position: absolute;
                padding: 20px;
                top: 20px;
                right:5%;
            }

            #close{
                position: absolute;
                top: -20px;
                right: 3px;
                --iron-icon-height: 20px;
                --iron-icon-width: 20px;
                width: 24px;
                height: 24px;
                --paper-fab-background:#9e9e9e;
                z-index: 1001;
            }

        </style>

        <div style="align-content: center;overflow: visible" id="graph_content">
            <svg id="sbiricuda"></svg>
        </div>

        <paper-dialog id="dialog">
            <paper-fab id="close" mini icon="close" on-click="_onCloseClick"></paper-fab>
            <h2 id="dialog_title"></h2>
            <paper-dialog-scrollable id="dialog_content">cos</paper-dialog-scrollable>
        </paper-dialog>

    </template>

    <script src="static/js/d3.v3.js"></script>

    <script>
        _this  = null;

        var dr = 4,      // default point radius
            off = 15,    // cluster hull offset
            expand = {}, // expanded clusters
            data, net, force, hullg, hull, linkg, link, nodeg, node;


        var fill = d3.scale.category20();
        var curve = d3.svg.line()
                .interpolate("cardinal-closed")
                .tension(.85);

        Polymer({
            is : 'graph-clustering-datalet',

            properties: {
                /**
                 * It's the url for the preview
                 *
                 * @attribute url
                 * @type Strig
                 * @default ''
                 */
                width: {
                    type: Number,
                    value: undefined
                },

                height: {
                    type: Number,
                    type: undefined
                },

                svg: {
                    type: Object,
                    value: undefined
                },

                feelings: {
                    type: Array,
                    values: ["Agree", "Neutral", "Not agree"]
                },

                gnodes : {
                    type : Array,
                    value : []
                },

                glinks : {
                    type :Array,
                    value : []
                },

                graph : {
                   type : Object,
                   value : {}
                },

                prev_selected_node : {
                    type : Object,
                    value : null
                }
            },

           /* fill : function(group){
                d3.scale.category20();
            },*/

            noop : function() { return false; },

            nodeid : function(n) {
                return n.size ? "_g_"+n.group : n.name;
            },

            linkid: function(l) {
                var u = _this.nodeid(l.source),
                    v = _this.nodeid(l.target);
                return u<v ? u+"|"+v : v+"|"+u;
            },

            getGroup: function(n) {
                return n.group;
            },

            // constructs the network to visualize
            network : function(prev, index, expand) {
                expand = expand || {};
                var gm = {},    // group map
                        nm = {},    // node map
                        lm = {},    // link map
                        gn = {},    // previous group nodes
                        gc = {},    // previous group centroids
                        nodes = [], // output nodes
                        links = []; // output links

                // process previous nodes for reuse or centroid calculation
                if (prev) {
                    prev.nodes.forEach(function(n) {
                        var i = index(n), o;
                        if (n.size > 0) {
                            gn[i] = n;
                            n.size = 0;
                        } else {
                            o = gc[i] || (gc[i] = {x:0,y:0,count:0});
                            o.x += n.x;
                            o.y += n.y;
                            o.count += 1;
                        }
                    });
                }

                // determine nodes
                for (var k=0; k < this.graph.nodes.length; ++k) {
                    var n = this.graph.nodes[k],
                            i = index(n),
                            l = gm[i] || (gm[i]=gn[i]) || (gm[i]={group:i, size:0, nodes:[]});

                    if (expand[i]) {
                        // the node should be directly visible
                        nm[n.name] = nodes.length;
                        nodes.push(n);
                        if (gn[i]) {
                            // place new nodes at cluster location (plus jitter)
                            n.x = gn[i].x + Math.random();
                            n.y = gn[i].y + Math.random();
                        }
                    } else {
                        // the node is part of a collapsed cluster
                        if (l.size == 0) {
                            // if new cluster, add to set and position at centroid of leaf nodes
                            nm[i] = nodes.length;
                            nodes.push(l);
                            if (gc[i]) {
                                l.x = gc[i].x / gc[i].count;
                                l.y = gc[i].y / gc[i].count;
                            }
                        }
                        l.nodes.push(n);
                    }
                    // always count group size as we also use it to tweak the force graph strengths/distances
                    l.size += 1;
                    n.group_data = l;
                }

                for (i in gm) { gm[i].link_count = 0; }

                // determine links
                for (k=0; k<this.graph.links.length; ++k) {
                    var e = this.graph.links[k],
                            u = index(e.source),
                            v = index(e.target);
                    if (u != v) {
                        gm[u].link_count++;
                        gm[v].link_count++;
                    }
                    u = expand[u] ? nm[e.source.name] : nm[u];
                    v = expand[v] ? nm[e.target.name] : nm[v];
                    var i = (u<v ? u+"|"+v : v+"|"+u),
                            l = lm[i] || (lm[i] = {source:u, target:v, size:0});
                    l.size += 1;
                }
                for (i in lm) { links.push(lm[i]); }

                return {nodes: nodes, links: links};
            },

            // constructs the network to visualize

            convexHulls : function(nodes, index, offset) {
                var hulls = {};

                // create point sets
                for (var k=0; k<nodes.length; ++k) {
                    var n = nodes[k];
                    if (n.size) continue;
                    var i = index(n),
                            l = hulls[i] || (hulls[i] = []);
                    l.push([n.x-offset, n.y-offset]);
                    l.push([n.x-offset, n.y+offset]);
                    l.push([n.x+offset, n.y-offset]);
                    l.push([n.x+offset, n.y+offset]);
                }

                // create convex hulls
                var hullset = [];
                for (i in hulls) {
                    hullset.push({group: i, path: d3.geom.hull(hulls[i])});
                }
                return hullset;
            },

            drawCluster : function(d) {
                return curve(d.path); // 0.8
            },

            init : function() {
                if (force) force.stop();

                net = this.network(net, this.getGroup, expand);

                force = d3.layout.force()
                        .nodes(net.nodes)
                        .links(net.links)
                        .size([this.width, this.height])
                        .linkDistance(function(l, i) {
                            var n1 = l.source, n2 = l.target;
                            // larger distance for bigger groups:
                            // both between single nodes and _other_ groups (where size of own node group still counts),
                            // and between two group nodes.
                            //
                            // reduce distance for groups with very few outer links,
                            // again both in expanded and grouped form, i.e. between individual nodes of a group and
                            // nodes of another group or other group node or between two group nodes.
                            //
                            // The latter was done to keep the single-link groups ('blue', rose, ...) close.
                            return 30 +
                                    Math.min(20 * Math.min((n1.size || (n1.group != n2.group ? n1.group_data.size : 0)),
                                                    (n2.size || (n1.group != n2.group ? n2.group_data.size : 0))),
                                            -30 +
                                            30 * Math.min((n1.link_count || (n1.group != n2.group ? n1.group_data.link_count : 0)),
                                                    (n2.link_count || (n1.group != n2.group ? n2.group_data.link_count : 0))),
                                            100);
                            //return 150;
                        })
                        .linkStrength(function(l, i) {
                            return 1;
                        })
                        .gravity(0.05)   // gravity+charge tweaked to ensure good 'grouped' view (e.g. green group not smack between blue&orange, ...
                        .charge(-600)    // ... charge is important to turn single-linked groups to the outside
                        .friction(0.5)   // friction adjusted to get dampened display: less bouncy bouncy ball [Swedish Chef, anyone?]
                        .start();

                hullg.selectAll("path.hull").remove();
                hull = hullg.selectAll("path.hull")
                        .data(this.convexHulls(net.nodes, this.getGroup, off))
                        .enter().append("path")
                        .attr("class", "hull")
                        .attr("d", this.drawCluster)
                        .style("fill", function(d) { return fill(d.group); })
                        .on("click", function(d) {
                            console.log("hull click", d, arguments, this, expand[d.group]);
                            expand[d.group] = false; _this.init();
                        });

                link = linkg.selectAll("line.link").data(net.links, this.linkid);
                link.exit().remove();
                link.enter().append("line")
                        .attr("class", "link")
                        .attr("x1", function(d) { return d.source.x; })
                        .attr("y1", function(d) { return d.source.y; })
                        .attr("x2", function(d) { return d.target.x; })
                        .attr("y2", function(d) { return d.target.y; })
                        .attr("style", function(t){ return "stroke:" + t.color })
                        .style("stroke-width", function(d) { return d.size || 1; });


                node = nodeg.selectAll("circle.node").data(net.nodes, this.nodeid);
                node.exit().remove();
                node.enter().append("circle")
                    // if (d.size) -- d.size > 0 when d is a group node.
                        .attr("class", function(d) { return "node" + (d.size?"":" leaf"); })
                        .attr("r", function(d) { return d.size ? d.size + dr : dr+1; })
                        //.attr("r", function (t) { return t.r;})
                        .attr("cx", function(d) { return d.x; })
                        .attr("cy", function(d) { return d.y; })
                        .attr("id", function(d){ return d.id; })
                        //.attr("style", function (t) { return t.color ? "fill:" + t.color : !1 + "; stroke:white" })
                        .style("fill", function(d) { return fill(d.group); })
                        .on("mouseover", this.mouseover)
                        .on("mouseout", this.mouseout)
                        .on("click", this.active)
                        .on("click", function(d) {
                            //console.log("node click", d, arguments, this, expand[d.group]);
                            expand[d.group] = !expand[d.group];
                            _this.init();
                        });

                node.call(force.drag);

                force.on("tick", function() {
                    if (!hull.empty()) {
                        hull.data(_this.convexHulls(net.nodes, _this.getGroup, off))
                                .attr("d", _this.drawCluster);
                    }

                    link.attr("x1", function(d) { return d.source.x; })
                            .attr("y1", function(d) { return d.source.y; })
                            .attr("x2", function(d) { return d.target.x; })
                            .attr("y2", function(d) { return d.target.y; });

                    node.attr("cx", function(d) { return d.x; })
                            .attr("cy", function(d) { return d.y; });
                });
            },

            buildGraph: function (){

                    this.svg = this.svg.append("g")
                            .call(d3.behavior.zoom().scaleExtent([.25, 20]).on("zoom", this.zoom))
                            .append("g");

                    //set initial zoom
                    scale = (1.0);
                    //translate = [(width-scale*width)/2, ((height-scale*height)/4)];
                    translate = [0, 0];
                    this.svg.transition()
                            .duration(750)
                            .attr("transform", "translate(" + translate + ")scale(" + scale +    ")")
                            .each("end", function () {
                                d3.behavior.zoom()
                                        .scale(scale)
                                        .translate(translate);
                            });
                    //end set initial zoom

                    this.svg.append("rect")
                            .attr("fill", "white")
                            .attr("width", this.width)
                            .attr("height", this.height);

                    //pezzotto
                    this.svg.append("filter")
                            .attr("id","filter1")
                            .attr("x","0%")
                            .attr("y","0%")
                            .attr("width","100%")
                            .attr("height","100%")
                            .append("feImage")
                            .attr("xlink:href","http://icons.iconarchive.com/icons/hopstarter/soft-scraps/256/User-Executive-Green-icon.png");

                    for (var i = 0; i < this.graph.links.length; ++i) {
                        o = this.graph.links[i];
                        o.source = this.graph.nodes[o.source];
                        o.target = this.graph.nodes[o.target];
                    }

                    hullg = this.svg.append("g");
                    linkg = this.svg.append("g");
                    nodeg = this.svg.append("g");

                    this.init();

                    this.svg.attr("opacity", 1e-6)
                            .transition()
                            .duration(1000)
                            .attr("opacity", 1);
            },

            zoom: function() {
                _this.svg.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
            },

            text: function (t){
                var e = t.append("svg:foreignObject").attr("width", 120).attr("height", 30);
                e.attr("style", function (t) {
                    return "color:" + (t.color ? t.color : "#000")
                }).append("xhtml:div").html(function (t) {
                    //return t.fixed ? t.name : null
                    return t.name;
                })
            },

            tick : function () {
                // d3.select("svg").attr("style", "transform:translate(8%)");
                d3.selectAll("g foreignObject").attr("x", function (t) {
                    return t.x + (t.r ? 0.8 * t.r : 15)
                }).attr("y", function (t) {
                    return t.y - 20
                });

                d3.selectAll("#logo text").attr("x", function (t) {
                    return t.x + .7 * (t.r ? t.r : 15)
                }).attr("y", function (t) {
                    return t.y
                });


                _this.gnodes.attr("cx", function (t) {
                    return t.x = Math.max(25, Math.min(_this.width - 50, t.x))
                }).attr("cy", function (t) {
                    return t.y = Math.max(8, Math.min(600, t.y))
                });

                _this.glinks.attr("x1", function (t) {
                    return t.source.x
                }).attr("y1", function (t) {
                    return t.source.y
                }).attr("x2", function (t) {
                    return t.target.x
                }).attr("y2", function (t) {
                    return t.target.y
                })
            },

            mouseover : function (t) {
                d3.select(this).selectAll("circle").transition().duration(600).ease("elastic").attr("r", function (t) {
                    //return 1 == t.fixed ? 1.4 * t.r : 15
                    return 1 == t.fixed ? 1.4 * t.r : t.r + 10;
                });

                _this.$.dialog.close();
                _this.$.dialog_title.innerHTML   = t.name;
                _this.$.dialog_content.innerHTML = t.content;

                _this.$.dialog.open();
            },

            mouseout : function () {
                d3.select(this).selectAll("text").style("visibility", "hidden"), d3.select(this).selectAll("circle").transition().duration(400).attr("r", function (t) {
                    return t.r ? t.r : 15
                });
                _this.$.dialog.close();
            },

            active : function (t) {
                _this.fire('graph-datalet_node-clicked', {node : t});

                if(_this.prev_selected_node != null){
                    _this.prev_selected_node.style.fill = _this.prev_selected_node.style.stroke;
                    _this.prev_selected_node.style.stroke = "#FFFFFF";
                }

                _this.prev_selected_node = document.getElementById("" + t.id);
                _this.prev_selected_node.style.fill   = "#FFFFFF"
                _this.prev_selected_node.style.stroke = t.color;

                /* _this.$.dialog.close();
                 _this.$.dialog_title.innerHTML   = t.name;
                 _this.$.dialog_content.innerHTML = t.content;

                 _this.$.dialog.open();*/
            },

            _onCloseClick : function(){
                //_this.$.dialog.close();
            },

            /**
             * It is called after the element’s template has been stamped and all elements inside the element’s local
             * DOM have been configured (with values bound from parents, deserialized attributes, or else default values)
             * and had their ready method called.
             *
             * Extract the dataset domain from the entire URL and set the text content of the datalet footer.
             *
             * @method ready
             *
             */
            ready: function(){

                _this = this;

                this.svg = d3.select("svg#sbiricuda").attr("class", "svg").attr({
                    width: "100%",
                    height: "100%"
                }).attr("viewBox", "0 0 " + this.width + " " + this.height)
                  .attr("pointer-events", "all")
                  .attr("style", "transform:translate(0px)")
                  .style("position", "absolute");

                var groups = [];
                for(var i= 0,j=0; i < this.graph.nodes.length;i++,j+=3){
                    groups.push([{key : "" + j, values : []}, {key : "" + (j + 1), values : []}, {key : "" + (j + 2), values : []}]);
                    if(this.graph.nodes[i].father != null){
                        switch (parseInt(this.graph.nodes[i].sentiment)){
                            case 1:
                                groups[this.graph.nodes[i].father.id][0].values.push(this.graph.nodes[i]);
                                break;
                            case 2:
                                groups[this.graph.nodes[i].father.id][1].values.push(this.graph.nodes[i]);
                                break;
                            case 3:
                                groups[this.graph.nodes[i].father.id][2].values.push(this.graph.nodes[i]);
                                break;
                        }
                    }
                }

                var index = 0;
                for(var i=0; i < groups.length; i++){
                    for(var j=0; j < groups[i].length;j++){
                        for(var k=0; k < groups[i][j].values.length;k++)
                            this.graph.nodes[groups[i][j].values[k].id].group = i;
                    }
                }

                this.buildGraph();
            }
        });
    </script>
</dom-module>