Adding directed/undirected attribute for graphs

config/plugins/visualizations/charts/static/repository/visualizations/cytoscape/viewer/config.js

@@ -32,6 +32,16 @@ define( [], function() {
                             { label : 'Preset', value : 'preset' },
                             { label : 'Random', value : 'random' } ]
             },
+            directed : {
+                label   : 'Directed/Undirected',
+                help    : 'Select a kind of edge.',
+                type    : 'select',
+                display : 'radio',
+                value   : '',
+                data    : [ { label : 'Directed', value : 'triangle' },
+                            { label : 'Undirected', value : '' } ]
+
+            },
             min_zoom : {
                 name  : 'min_zoom',
                 label : 'Minimum zoom',

config/plugins/visualizations/charts/static/repository/visualizations/cytoscape/viewer/wrapper.js

@@ -42,7 +42,8 @@ define( [ 'utilities/utils', 'utilities/sifjson', 'plugins/cytoscape/cytoscape'
 				    'haystack-radius': 0,
 				    'width': 5,
 				    'opacity': 0.5,
-				    'line-color': '#a8eae5'
+				    'line-color': '#a8eae5',
+                                    'target-arrow-shape': settings.get( 'directed' )
 			        }
 			    }],
                             elements: data_content