Template:GraphHeader/GraphCreator.js

From 2009.igem.org

(Difference between revisions)

Revision as of 14:42, 24 June 2009

var loaded = 0;

function onLoadCallback() {

 loaded++;
 if (loaded==2) {
   loadGraphs();
 }

}

google.load('visualization', '1', {'packages':['scatterchart']}); google.setOnLoadCallback(onLoadCallback);

dojo.require("dojox.charting.Chart2D"); dojo.require("dojox.charting.widget.Legend"); dojo.addOnLoad(onLoadCallback);

function loadGraphs() {

 var graphs = dojo.query('.graph');
 for(var g=0; g<graphs.length; g++) {
   loadGraph(graphs[g]);
 }

}

function loadGraph(graph) {

 var links = dojo.query('a',graph);
 if (links.length!=1) return; // TODO: Nicer error handling?
 dojo.xhrGet( {
   url: links[0].href.replace(/\#.*/,),
   content: {action: 'raw', templates: 'expand'},
   preventCache: true,
   handleAs: "json",
   load: function(responseObject, ioArgs) {
     createGraph(graph, responseObject);
   },
   error: function(responseObject, ioArgs) {
     graph.innerHTML = ;
     graph.appendChild(document.createTextNode('Error loading '));
     graph.appendChild(links[0]);
     graph.appendChild(document.createTextNode('!'));
     graph.appendChild(document.createElement('br'));
     graph.appendChild(document.createTextNode(responseObject.message));
   }
 });

}

function createGraph(graph, desc) {

 // Some layout stuff
 graph.innerHTML = ;

 // Create div's for graph
 var chartDiv = document.createElement('div');
 chartDiv.style.textAlign = 'left';
 chartDiv.style.width = desc.width;
 chartDiv.style.height = desc.height;
 graph.appendChild(chartDiv);
 graph.style.width = chartDiv.style.width;

 var legendCenter = document.createElement('center');
 graph.appendChild(legendCenter);
 var legendDiv = document.createElement('div');
 legendCenter.appendChild(legendDiv);

 // Create chart and legend
 var chart = new dojox.charting.Chart2D(chartDiv);
 for(var a in desc.axes) {
   chart.addAxis(a, desc.axes[a]);
 }
 for(var p in desc.plots) {
   chart.addPlot(p, desc.plots[p]);
 }
 var legend = new dojox.charting.widget.Legend({chart: chart}, legendDiv);

 // Query spreadsheet and let result be drawn
 var query = new google.visualization.Query(desc.datasource);
 query.send(function(response){drawGraph(desc,chart,legend,response);});

}

function drawGraph(desc,chart,legend,response) {

 if (response.isError()) {
   alert('Error in query: ' + response.getMessage() + ' ' + response.getDetailedMessage());
   return;
 }

 var data = response.getDataTable();

 var series = dojoSeriesFromDataTable(data,desc.series);
 for(var i=0; i<series.length; i++) {
   chart.addSeries(series[i].title, series[i].data, series[i].args);
 }
 chart.render();
 for(var a in desc.axes) { // This works around axis titles not being supported!!!
   if (desc.axes[a].title!=undefined) setAxisTitle(chart, a, desc.axes[a].title, 10);
 }
 legend.refresh();

}

function dojoSeriesFromDataTable(dataTable,series) {

 var dojoSeriesArray = [];
 for(var s=0; s<series.length; s++) {
   var xc = series[s].x, yc = series[s].y;
   var dojoSeries = [];
   for(var r=0; r<dataTable.getNumberOfRows(); r++) {
     dojoSeries.push({x: dataTable.getValue(r,xc), y: dataTable.getValue(r,yc)});
   }
   dojoSeriesArray.push({title: series[s].title===undefined ?
                                  dataTable.getColumnLabel(yc) : series[s].title,
                         data: dojoSeries,
                         args: getSeriesArgs(series[s])});
 }
 return dojoSeriesArray;

}

function getSeriesArgs(series) {

 var args = {};
 for(var p in series) {
   if (p=='title' || p=='x' || p=='y') continue;
   args[p] = series[p];
 }
 return args;

}

// Code from http://trac.dojotoolkit.org/ticket/7746 var setAxisTitle=function(chart, axisname, title, fontsizept) {

   var axis = chart.axes[axisname];
   var dim = chart.dim;
   var offsets=chart.offsets;
   var ta = chart.theme.axis;
   var taFont = "font" in axis.opt ? axis.opt.font : ta.font;
   var x;
   var y;
   var label;
   var rotate=0;
   if(axis.vertical) {
       rotate=270
       label = title;
       y=dim.height/2  - offsets.b/2;
       x=0+2*fontsizept;
   } else {
       label = title;
       x=dim.width/2 + offsets.l/2;
       y=dim.height-fontsizept/2;
   }
   var m = dojox.gfx.matrix;
   var elem = axis.group.createText({x:x, y:y, text:label, align: "middle"});
   elem.setFont({family:taFont.family, size: fontsizept+"pt", weight: "bold"});
   elem.setFill('grey');
   elem.setTransform(m.rotategAt(rotate, x,y));

}