Google style chart - interactive: Difference between revisions

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By clicking on points one can set new values for the y-coordinates.
<jsxgraph width="647" height="400">
<jsxgraph width="647" height="400">
  var graph1;
  var graph1;
Line 11: Line 12:
   var start = 0;
   var start = 0;
   var end = 20;
   var end = 20;
   points.push(brd.createElement('point', [start,0], {visible:false, name:'', fixed:true}));  
   points.push(brd.create('point', [start,0], {visible:false, name:'', fixed:true}));  
   for (i=start;i<=end;i++) {
   for (i=start;i<=end;i++) {


Line 19: Line 20:


     // Plot it
     // Plot it
     p = brd.createElement('point', [x1,y1],  
     p = brd.create('point', [x1,y1],  
                   {strokeWidth:2, strokeColor:'#ffffff',  
                   {strokeWidth:2, strokeColor:'#ffffff',  
                     highlightStrokeColor:'#0077cc', fillColor:'#0077cc',   
                     highlightStrokeColor:'#0077cc', fillColor:'#0077cc',   
                     highlightFillColor:'#0077cc', style:6, name:'', fixed:true}
                     highlightFillColor:'#0077cc', style:6, name:'', fixed:true}
                 );  
                 );  
    points.push(p);
    x.push(x1);
    y.push(y1);


     p.num = i;                          // memorize the number of this point in the array
     p.rendNode._num = i;                          // memorize the number of this point in the array
     p.rendNode.onclick = function() {  
     p.rendNode.onclick = function() {
        var i = this._num;                        // Now we can access the number again
        var p = points[i+1];                      // The point number is one off
         var v = prompt("New value:", p.Y())*1.0;
         var v = prompt("New value:", p.Y())*1.0;
         this.setPosition(JXG.COORDS_BY_USER, p.X(), v);
         p.setPosition(JXG.COORDS_BY_USER, p.X(), v); // New coordinates for the point
         y[p.num] = v;
         y[i] = v;                                 // New coordinates for the curve
         brd.update();
         brd.update();
     };
     };
  }
  // Filled area. We need two additional points [start,0] and [end,0]
  points.push(brd.create('point', [end,0], {visible:false, name:'', fixed:true}));
  brd.create('polygon',points, {withLines:false,fillColor:'#e6f2fa'});
 
  // Curve:
  brd.create('curve', [x,y],
                {strokeWidth:3, strokeColor:'#0077cc',
                  highlightStrokeColor:'#0077cc'}
              );
}
doIt();
</jsxgraph>
===JavaScript code to produce this chart===
<source lang="javascript">
var graph1;
var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-1,6,21,-1], axis: true});


function doIt() {
  var i, x1, y1;
  var p;
  var points = [];
  var x = [];
  var y = [];
  var start = 0;
  var end = 20;
  points.push(brd.create('point', [start,0], {visible:false, name:'', fixed:true}));
  for (i=start;i<=end;i++) {
    // Generate random coordinates
    x1 = i;
    y1 = Math.random()*4+1;
    // Plot it
    p = brd.create('point', [x1,y1],
                  {strokeWidth:2, strokeColor:'#ffffff',
                    highlightStrokeColor:'#0077cc', fillColor:'#0077cc', 
                    highlightFillColor:'#0077cc', style:6, name:'', fixed:true}
                );
     points.push(p);
     points.push(p);
     x.push(x1);
     x.push(x1);
     y.push(y1);
     y.push(y1);
    p.rendNode._num = i;                          // memorize the number of this point in the array
    p.rendNode.onclick = function() {
        var i = this._num;                        // Now we can access the number again
        var p = points[i+1];                      // The point number is one off
        var v = prompt("New value:", p.Y())*1.0;
        p.setPosition(JXG.COORDS_BY_USER, p.X(), v); // New coordinates for the point
        y[i] = v;                                  // New coordinates for the curve
        brd.update();
    };
   }
   }
   // Filled area. We need two additional points [start,0] and [end,0]
   // Filled area. We need two additional points [start,0] and [end,0]
   points.push(brd.createElement('point', [end,0], {visible:false, name:'', fixed:true}));  
   points.push(brd.create('point', [end,0], {visible:false, name:'', fixed:true}));  
   brd.createElement('polygon',points, {withLines:false,fillColor:'#e6f2fa'});
   brd.create('polygon',points, {withLines:false,fillColor:'#e6f2fa'});
    
    
   // Curve:
   // Curve:
   brd.createElement('curve', [x,y],  
   brd.create('curve', [x,y],  
                 {strokeWidth:3, strokeColor:'#0077cc',  
                 {strokeWidth:3, strokeColor:'#0077cc',  
                   highlightStrokeColor:'#0077cc'}
                   highlightStrokeColor:'#0077cc'}
               );  
               );  
}
}
brd.suspendUpdate();
doIt();
doIt();
brd.unsuspendUpdate();
</source>
</jsxgraph>
 
[[Category:Examples]]
[[Category:Charts]]

Latest revision as of 13:12, 3 March 2021

By clicking on points one can set new values for the y-coordinates.

JavaScript code to produce this chart

 var graph1;
 var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-1,6,21,-1], axis: true});

function doIt() {
   var i, x1, y1;
   var p;
   var points = [];
   var x = [];
   var y = [];
   var start = 0;
   var end = 20;
   points.push(brd.create('point', [start,0], {visible:false, name:'', fixed:true})); 
   for (i=start;i<=end;i++) {

     // Generate random coordinates
     x1 = i;
     y1 = Math.random()*4+1;

     // Plot it
     p = brd.create('point', [x1,y1], 
                   {strokeWidth:2, strokeColor:'#ffffff', 
                    highlightStrokeColor:'#0077cc', fillColor:'#0077cc',  
                    highlightFillColor:'#0077cc', style:6, name:'', fixed:true}
                 ); 
     points.push(p);
     x.push(x1);
     y.push(y1);

     p.rendNode._num = i;                          // memorize the number of this point in the array
     p.rendNode.onclick = function() {
        var i = this._num;                         // Now we can access the number again
        var p = points[i+1];                       // The point number is one off
        var v = prompt("New value:", p.Y())*1.0;
        p.setPosition(JXG.COORDS_BY_USER, p.X(), v); // New coordinates for the point
        y[i] = v;                                  // New coordinates for the curve
        brd.update();
     };
   }
   // Filled area. We need two additional points [start,0] and [end,0]
   points.push(brd.create('point', [end,0], {visible:false, name:'', fixed:true})); 
   brd.create('polygon',points, {withLines:false,fillColor:'#e6f2fa'});
   
   // Curve:
   brd.create('curve', [x,y], 
                 {strokeWidth:3, strokeColor:'#0077cc', 
                  highlightStrokeColor:'#0077cc'}
               ); 
}
doIt();