Time series

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Revision as of 09:35, 9 June 2011 by Michael (talk | contribs)

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Input data

Simple style

JavaScript code

brd = JXG.JSXGraph.initBoard('jxgbox', {axis:true, boundingbox: [-6, 150, 64, -50]});

var inputString = document.getElementById('inputData').value;        // Read the data as string
inputString = inputString.replace(/^\s+/, '').replace(/\s+$/, '');   // Remove leading and trailing whitespace
var lines=inputString.split('\n');                                   // Split into lines
var x = [];
var y = [];
var startDate;
for (var i=0;i<lines.length;i++) { 
    var c = lines[i].split(' : ');
    var d = c[0].split('-');
    var v = parseFloat(c[1].replace(/,+/,'.'));                      // Change 126,5 to 126.5
    var date = new Date(d[0],d[1],d[2]);                             // Split the date into Year, Month, Day
    if (i==0) { startDate = new Date(d[0],d[1],d[2]); }              // Keep the first date in memory
    x[i] = (date.getTime()-startDate.getTime())/ ( 1000.0*60.0*60.0*24.0 );  // The x coordinate of a value is the number of days from the first entry
    y[i] = v;
       
}
var plot = brd.create('curve', [x,y], {strokeColor:'red'});

Time series - Google style

JavaScript code

brd2 = JXG.JSXGraph.initBoard('jxgbox2', {boundingbox:[-5,130,60,80]});
var xax = brd2.create('axis',[[0,85],[1,85]]);
var yax = brd2.create('axis',[[0,0],[0,1]]);

inputString = document.getElementById('inputData').value;        // Read the data as string
inputString = inputString.replace(/^\s+/, '').replace(/\s+$/, '');   // Remove leading and trailing whitespace
var lines=inputString.split('\n');                                   // Split into lines
var p, x1, y1;
var x = [];
var y = [];
var points = [];

points.push(brd2.create('point', [0,85], {visible:false, name:'', fixed:true})); 
var startDate;
for (var i=0;i<lines.length;i++) { 
    var c = lines[i].split(' : ');
    var d = c[0].split('-');
    var v = parseFloat(c[1].replace(/,+/,'.'));                      // Change 126,5 to 126.5
    var date = new Date(d[0],d[1],d[2]);                             // Split the date into Year, Month, Day
    if (i==0) { startDate = new Date(d[0],d[1],d[2]); }              // Keep the first date in memory
    x1 = (date.getTime()-startDate.getTime())/ ( 1000.0*60.0*60.0*24.0 );  // The x coordinate of a value is the number of days from the first entry
    y1 = v;
    p = brd2.create('point', [x1,y1], 
               {strokeWidth:2, strokeColor:'#ffffff', 
                highlightStrokeColor:'#0077cc', fillColor:'#0077cc',  
                highlightFillColor:'#0077cc', size:4, name:'', fixed:true});
    points.push(p);
    x.push(x1);
    y.push(y1);
     
}
points.push(brd2.create('point', [x1,85], {visible:false, name:'', fixed:true})); 
 
// Filled area. We need two additional points [start,0] and [end,0]
brd2.create('polygon',points, {withLines:false,fillColor:'#e6f2fa',withLabel:false});

// Curve:
brd2.create('curve', [x,y], 
             {strokeWidth:3, strokeColor:'#0077cc', 
             highlightStrokeColor:'#0077cc'}
           );