Added basic graph opening functionality.

Author: Jabbath

package.json

@@ -1,6 +1,6 @@
 {
     "name": "graph-creator",
-    "version": "0.6.4",
+    "version": "0.7.4",
     "main": "index.html",
     "window": {
         "height": 1024,

src/creator.js

@@ -109,8 +109,7 @@ function addEdge(evt){
             group: 'edges',
             data: {
                 source: selected[0].id(),
-                target: selected[1].id(),
-                weight: 1
+                target: selected[1].id()
             }
         });
 

src/fileWrite.js

@@ -226,8 +226,8 @@ function makePositionsString(nodeList){
             posJSON = posJSON + '"' + nodeList[i].data('id') + '": ';
         }
         //Scale the coordinates
-        var relX = nodeList[i].position().x / map.width,
-            relY = nodeList[i].position().y / map.height;
+        var relX = nodeList[i].position().x / 1080,
+            relY = nodeList[i].position().y / 720;
 
         //Make sure the last entry doesn't have a comma
         if(i < nodeList.length - 1){
@@ -258,6 +258,150 @@ function writePositions(){
         });
     });
 }
+//**************************************************************************
+//OPEN POSITIONS
+//**************************************************************************
+function parsePositions(posData){
+    /*
+    Given a json positions file, reads it and applies the positions to
+    the nodes in the graph.
+
+    INPUT
+    posData: The positions of the nodes in the graph
+    */
+
+    var positions = JSON.parse(posData);
+    
+    //Go through each nodes position and assign it
+    for(key in positions){
+        cy.getElementById(key).position('x', 1080 * positions[key][0]);
+        cy.getElementById(key).position('y', 720 *  positions[key][1]);
+    }
+}
+
+
+function openPositions(){
+    /*
+    Opens a JSON  form positions file and loads it into cytoscape.
+    */
+
+    dialog.setContext(document);
+    
+    //Open a multiline adjlist and add the nodes
+    dialog.openFileDialog(function(filePath){
+        fs.readFile(filePath, function (err, data){ 
+            if(err) throw err;
+            
+            parsePositions(data.toString());
+        });
+    });
+}
+
+//***************************************************************************
+//OPEN GRAPHS
+//***************************************************************************
+
+function parseGraph(graph){
+    /*
+    Given input of a multiline adjlist as a string,
+    parses it and creates the cytoscape graph.
+
+    INPUT
+    graph: A string of a multiline adjlist
+    */
+
+    //Remove any existing graph
+    cy.elements().remove();
+    
+    var lines = graph.split('\r\n');
+    if(lines.length === 0) throw new Error('Could not open graph: no data');
+
+    var currentLine = 0;
+    
+    //Read each of the adjacencies for a source node and add them
+    while(currentLine < lines.length - 1){
+        
+        //Read the first node and add it
+        var sourceNode = lines[currentLine].split(' ')[0];
+        var degree = parseInt(lines[currentLine].split(' ')[1]);
+        
+        //If the source node already exists this will make an error
+        try{   
+            cy.add({
+                group: 'nodes',
+                data: {
+                    id: sourceNode
+                }
+            });
+        }catch(err){}
+
+        currentLine++;
+
+        edges = lines.slice(currentLine, currentLine + degree);
+        
+        //Add each edge if it doesn't exist already
+        for(var i=0; i<edges.length; i++){
+            //Split up the edge destination and properties
+            var sepString = edges[i].split('{');
+            
+            //Get the target node and remove the extra space if there was a bracket
+            if(sepString[0].length === 2){
+                var targetNode = sepString[0].slice(0, -1);
+            }
+            else{
+                var targetNode = sepString[0];
+            }
+
+            
+            var weight = '';
+            //Get the properties properties
+            if(sepString.length === 2){
+                weight = JSON.parse('{' + sepString[1]).weight.toString();
+            }
+            
+            //Add the target node in case it doesn't exist
+            try{    
+                cy.add({
+                    group: 'nodes',
+                    data: {
+                        id: targetNode
+                    }
+                });
+            }catch(err){}
+            
+            //Add the edge
+            cy.add({
+                group: 'edges',
+                data: {
+                    source: sourceNode,
+                    target: targetNode
+                },
+                style: {
+                    label: weight
+                }
+            });
+        }
+
+        currentLine+= degree;
+    }
+}
+
+function openGraph(){
+    /*
+    Opens a multiline adjlist form graph file and loads it into cytoscape.
+    */
+
+    dialog.setContext(document);
+    
+    //Open a multiline adjlist and add the nodes
+    dialog.openFileDialog(function(filePath){
+        fs.readFile(filePath, function (err, data){ 
+            if(err) throw err;
+            
+            parseGraph(data.toString());
+        });
+    });
+}
 
 //****************************************************************************
 //OPEN BACKGROUND IMAGE

src/menu.js

@@ -3,10 +3,20 @@ var menu = new nw.Menu({type: 'menubar'});
 
 var fileSubmenu = new nw.Menu();
 fileSubmenu.append(new nw.MenuItem({
-    label: 'Open',
+    label: 'Load Background',
     click: openImage
 }));
 
+fileSubmenu.append(new nw.MenuItem({
+    label: 'Load Graph',
+    click: openGraph
+}));
+
+fileSubmenu.append(new nw.MenuItem({
+    label: 'Load Positions',
+    click: openPositions
+}));
+
 menu.append(new nw.MenuItem({
     label: 'File',
     submenu: fileSubmenu