Joint.js add custom ports with path class. for custom elements

What I am trying to do is make a element with custom class for ports and path so that I can add an element with custom path and my own markup for ports.This way when I create an element I will pass dynamic path for its shape just like elements of path class behave and as I have also extended from PortsModelInterface I will also have my own markup for ports. This whole effort is to make svg scalable for zomming. Previously I was using html custom element with my custom ports which was working fine but html of custom elements wasn't scaling on zooming

var graph = new joint.dia.
var paper = new joint.dia.Paper({
    el: $('#paper'),
    width: 800,
    height: 600,
    gridSize: 1,
    model: graph,
    snapLinks: true,
    embeddingMode: true
});
joint.shapes.custom1={};
 joint.shapes.custom1.Element = joint.shapes.basic.Generic.extend(_.extend({}, joint.shapes.basic.PortsModelInterface, {
        markup: '<g class="rotatable"><g class="scalable"><rect class = "myrect"/></g><g class="inPorts"/><g class="outPorts"/></g>',
        portMarkup: '<g class="port<%= id %>"><circle class="port-body"/></g>',
        defaults: joint.util.deepSupplement({
            type: 'html.Element',
            size: { width: 200, height: 110 },
            inPorts: [],
            outPorts: [],
            attrs: {
                '.': { magnet: true},
                rect: {
                    stroke: 'none', 'fill-opacity': 0, width: 300, height: 210,
                },
                circle: {
                    r: 6, //circle radius
                    magnet: true,
          left:0,
                    stroke: 'gray'
                },

                '.inPorts circle': { fill: 'gray', magnet: 'passive', type: 'input', y: 0},
                '.outPorts circle': { fill: 'gray', type: 'output' }
            }
        }, joint.shapes.basic.Generic.prototype.defaults),
        getPortAttrs: function (portName, index, total, selector, type) {

            var attrs = {};
            var portClass = 'port' + index;
            var portSelector = selector + '>.' + portClass;
            var portCircleSelector = portSelector + '>circle';
            attrs[portCircleSelector] = { port: { id: portName || _.uniqueId(type), type: type } };
            attrs[portSelector] = { ref: 'rect', 'ref-x': (index + 1) * (0.55 / total)};
            if (selector === '.outPorts') { 
          attrs[portSelector]['ref-dy'] = 15; 
      }
            return attrs;
        }
    }));
joint.shapes.custom1.Atomic = joint.shapes.custom1.Element.extend({

    markup: '<g class="rotatable"><g class="scalable"><path/></g><text/></g>',

    defaults: joint.util.deepSupplement({

        type: 'basic.Path',
        size: { width: 60, height: 60 },
        attrs: {
            'path': { fill: '#FFFFFF', stroke: 'black' },
            'text': { 'font-size': 14, text: '', 'text-anchor': 'middle', 'ref-x': .5, 'ref-dy': 20, ref: 'path', 'y-alignment': 'middle', fill: 'black', 'font-family': 'Arial, helvetica, sans-serif' }
        }
    }, joint.shapes.basic.Generic.prototype.defaults)

});

var a2 = new joint.shapes.custom1.Atomic({
    position: { x: 50, y: 260 },
    size: { width: 100, height: 100 },
    attrs: {
        path: { d: 'M 30 0 L 60 30 30 60 0 30 z' },
        text: {
            text: 'Diamond',
            'ref-y': .5 // basic.Path text is originally positioned under the element
        }
    },
     inPorts: ['in'],
     outPorts: ['out']
});
graph.addCells([a2])

The element is added in graph but some how the ports don't show up. I don't have proper concept of adding classes so please any help will be greatly appreciated. Thanks. Fiddle example

Answers:

Answer

I suggest to define an element with custom markup for the shape and ports. Both markups should contain an SVG path, so you can set an arbitrary path data d via model.attr() on them.

joint.shapes.devs.GenericModel = joint.shapes.devs.Model.extend({

    markup: '<g class="rotatable"><g class="scalable"><path class="body"/></g><text class="label"/><g class="inPorts"/><g class="outPorts"/></g>',
    portMarkup: '<g class="port port<%= id %>"><path class="port-body"/><text class="port-label"/></g>',

    defaults: joint.util.deepSupplement({
        type: 'devs.GenericModel'
    }, joint.shapes.devs.Model.prototype.defaults)
});

Tell the paper to use devs.ModelView for rendering.

joint.shapes.devs.GenericModelView = joint.shapes.devs.ModelView;

Now you can set or change d attribute for the shape and ports anytime you wish.

var model = new joint.shapes.devs.GenericModel({
    attrs: {
        '.body': { d: 'M 0 0 0 50 50 50 z'},
        '.port-body': { d: 'M 0 0 10 0 10 10 0 10 z'}
    } 
});

model.attr('.body/d', 'M 25 0 50 50 0 50 z');

JS Fiddle: http://jsfiddle.net/kumilingus/kge023bc/

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