Difference between revisions of "Images"

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(Dynamic image II)
Line 57: Line 57:
 
             function(){if (p.X()<0) { return urlImg1; } else { return urlImg2; } },
 
             function(){if (p.X()<0) { return urlImg1; } else { return urlImg2; } },
 
             [function(){return p.X();},function(){return p.Y();}], [2*1.61,2]  
 
             [function(){return p.X();},function(){return p.Y();}], [2*1.61,2]  
           ]);  
+
           ],
 +
          { opacity: function(){ return 1/Math.abs(Math.exp(p.Y()));} });  
 
})();
 
})();
 
</jsxgraph>
 
</jsxgraph>
  
 
===The JavaScript code===
 
===The JavaScript code===
The parameters
 
* ''urlImage''
 
* ''[x,y]''
 
* ''[w,h]''
 
can be given by functions. Here is an example where the position of the image depends on the position of the point "A".
 
 
<source lang="javascript">
 
<source lang="javascript">
 
   var brd = JXG.JSXGraph.initBoard('box2', {boundingbox:[-5,5,5,-5],axis:true});
 
   var brd = JXG.JSXGraph.initBoard('box2', {boundingbox:[-5,5,5,-5],axis:true});

Revision as of 23:00, 1 January 2011

Static image

The JavaScript code

Images can be included with the command

var im = brd.create('image',[urlImg, [-1,-1], [2*2.67181,2] ]);

It has the parameters:

  • urlImage: URL of the image. Data URLs are possible, but will not beshown in the Internet Explorer <8 and are restricted to max. 32kByte in the Internet Explorer 8.
  • [x,y]: position of the lower left corner of the image.
  • [w,h]: width and height of the image.
var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,5,5,-5],axis:true});
var urlImg = "http://jsxgraph.uni-bayreuth.de/distrib/images/uccellino.jpg";
var im = brd.create('image',[urlImg, [-1,-1], [3,3] ]);

Dynamic image I

The JavaScript code

The parameters

  • urlImage
  • [x,y]
  • [w,h]

can be given by functions. Here is an example where the position of the image depends on the position of the point "A".

  var brd = JXG.JSXGraph.initBoard('box2', {boundingbox:[-5,5,5,-5],axis:true});
  var p = brd.create('point',[-1,-1], {size:10, opacity:0.3});
  var urlImg = "http://jsxgraph.uni-bayreuth.de/distrib/images/uccellino.jpg";
  var im = brd.create('image',[urlImg, [function(){return p.X();},function(){return p.Y();}], [3,3] ]);

Dynamic image II

The JavaScript code

  var brd = JXG.JSXGraph.initBoard('box2', {boundingbox:[-5,5,5,-5],axis:true});
  var p = brd.create('point',[-1,-1], {size:10, opacity:0.3});
  var urlImg = "http://jsxgraph.uni-bayreuth.de/distrib/images/uccellino.jpg";
  var im = brd.create('image',[urlImg, [function(){return p.X();},function(){return p.Y();}], [3,3] ]);