Create your own constructions/visualizations using JavaScript

First step

Link to prototye.js and to jsxgraphcore.js:

<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/prototype.js"></script>
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>

Second step

Insert a div inside of the document body:

<div id="box" class="jxgbox" style="width:400px; height:400px;"></div>

Third step

Connect JXG with the div (usually at the end of the document body) and call initBoard():

<script type="text/javascript">
 var board = JXG.JSXGraph.initBoard('box', {originX: 100, originY: 200, unitX: 50, unitY: 50});
</script>

• Parameter 1: id of the division
• Parameter 2: properties of the board. Possible entries are:
  • originX
  • originY
  • unitX
  • unitY
  • zoomX
  • zoomY

More than one boards can be initialised simultaneously in one HTML file.

Fourth step: Creating geometric elements

Through the variable board new geometry elements can be added to the board. All elements are added with the method createElement():

board.createElement('point', [1,3], {name:'A', strokecolor:'red'});

Another example:

board.createElement('point', [function(){return s.X();},function(){return t.X()}], {trace:true});

The parameters of createElement() are:

board.createElement(elementType, parentElements, attributes);

where

• elementType is a string containing the type of the element which is constructed. At the moment, possible types are:
  • primitive elements:
    • angle
    • arc
    • arrow
    • circle
    • curve
    • group
    • line
    • point
    • polygon
    • sector
    • text
    • transform
  • composite elements:
    • arrowparallel
    • bisector
    • circumcircle
    • circumcirclemidpoint
    • integral
    • midpoint
    • mirrorpoint
    • normal
    • parallel
    • parallelpoint
    • perpendicular
    • perpendicularpoint
    • reflection
• parentElements is an array containing the parameters which define the element. This can be parent elements like two points which define a line. It can also consist of JavaScript functions, numbers, and strings containing GEONExT syntax. The possible array elements depend on the element type.
• attributes is a JavaScript object. Usually it is given in the "literal object" form

{key1:value1, key2:value2, ...}

• Properties of a point:
  • style
  • strokeColor
  • strokeWidth
  • fillColor
  • highlightStrokeColor
  • highlightFillColor
  • labelColor
  • visible
  • fixed
  • draft
  • trace
• Additional properties of a line:
  • straightFirst
  • straightLast

There are no additional properties of a circle

• Additional properties for an element:
  • needsRegularUpdate = [true]/false (eg axis are set to needsRegularUpdate=false) These elements are updated only, if the origin of the board is moved or after zooming
• Possible parameters:

el.setProperty('key1:value1','key2:value2',...);
el.setProperty([key1:value1],[key2:value2],...);
el.setProperty({key1:value1, key2:value2},...);