Polygon: Difference between revisions

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To construct a polygon an array of already constructed points is required. So we first have to construct at least three points:
To construct a polygon an array of already constructed points is required. So we first have to construct at least three points:
<source lang="javascript">
<source lang="javascript">
var b = JXG.JSXGraph.initBoard('jxgbox', {originX: 200, originY: 100, unitX: 50, unitY: 50});
var b1 = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-4, 2, 6, -4]});
var p1 = b.createElement('point',[0,0], {name:'X',style:6});
var p1 = b1.create('point',[0,0], {name:'X', size:4});
var p2 = b.createElement('point',[2,-1], {name:'B',style:6});
var p2 = b1.create('point',[2,-1], {name:'B', size:4});
var p3 = b.createElement('point',[-2,-3], {name:'C',style:6});
var p3 = b1.create('point',[-2,-3], {name:'C', size:4});
var p4 = b.createElement('point',[-1,-1], {name:'D',style:6});
var p4 = b1.create('point',[-1,-1], {name:'D', size:4});
var p5 = b.createElement('point',[3,1], {name:'E',style:6});
var p5 = b1.create('point',[3,1], {name:'E', size:4});
</source>
</source>
Note that the "style" option is optional as is the parameter "name".
Note that the "size" attribute is optional as is the attribute "name".
Next we create a polygon through these five points "A" to "E".
Next we create a polygon through these five points "A" to "E".
<source lang="javascript">
<source lang="javascript">
var poly = b.createElement('polygon',["X","B","C","D","E"]);
var poly = b1.create('polygon',["X","B","C","D","E"], { borders:{strokeColor:'black'} });
</source>
</source>
Of course we can also use the JavaScript objects p1 to p5:
Of course we can also use the JavaScript objects p1 to p5:
<source lang="javascript">
<source lang="javascript">
var poly = b.createElement('polygon',[p1,p2,p3,p4,p5]);
var poly = b1.create('polygon',[p1,p2,p3,p4,p5], { borders:{strokeColor:'black'} });
</source>
</source>
The result is the same:
The result is the same:
<html>
<jsxgraph box="jxgbox" width="500" height="300">
<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
var b1 = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-4, 2, 6, -4]});
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>
var p1 = b1.create('point',[0,0], {name:'X',size:4});
<div id="jxgbox" class="jxgbox" style="width:500px; height:300px;"></div>
var p2 = b1.create('point',[2,-1], {name:'B',size:4});
<script type="text/javascript">
var p3 = b1.create('point',[-2,-3], {name:'C',size:4});
var b1 = JXG.JSXGraph.initBoard('jxgbox', {originX: 200, originY: 100, unitX: 50, unitY: 50});
var p4 = b1.create('point',[-1,-1], {name:'D',size:4});
var p1 = b1.createElement('point',[0,0], {name:'X',style:6});
var p5 = b1.create('point',[3,1], {name:'E',size:4});
var p2 = b1.createElement('point',[2,-1], {name:'B',style:6});
var p3 = b1.createElement('point',[-2,-3], {name:'C',style:6});
var p4 = b1.createElement('point',[-1,-1], {name:'D',style:6});
var p5 = b1.createElement('point',[3,1], {name:'E',style:6});
 
var poly = b1.createElement('polygon',[p1,p2,p3,p4,p5]);
</script>
</html>


var poly = b1.create('polygon',[p1,p2,p3,p4,p5], { borders:{strokeColor:'black'} });
</jsxgraph>




[[Category:Examples]]
[[Category:Examples]]

Latest revision as of 12:35, 23 June 2020

Polygon defined by existing points

To construct a polygon an array of already constructed points is required. So we first have to construct at least three points: 

var b1 = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-4, 2, 6, -4]});
var p1 = b1.create('point',[0,0], {name:'X', size:4});
var p2 = b1.create('point',[2,-1], {name:'B', size:4});
var p3 = b1.create('point',[-2,-3], {name:'C', size:4});
var p4 = b1.create('point',[-1,-1], {name:'D', size:4});
var p5 = b1.create('point',[3,1], {name:'E', size:4});

Note that the "size" attribute is optional as is the attribute "name". Next we create a polygon through these five points "A" to "E". 

var poly = b1.create('polygon',["X","B","C","D","E"], { borders:{strokeColor:'black'} });

Of course we can also use the JavaScript objects p1 to p5: 

var poly = b1.create('polygon',[p1,p2,p3,p4,p5], { borders:{strokeColor:'black'} });

The result is the same:

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