Polygon: Difference between revisions
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<source lang="javascript"> | <source lang="javascript"> | ||
var b1 = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-4, 2, 6, -4]}); | var b1 = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-4, 2, 6, -4]}); | ||
var p1 = b1.create('point',[0,0], {name:'X',size:4}); | var p1 = b1.create('point',[0,0], {name:'X', size:4}); | ||
var p2 = b1.create('point',[2,-1], {name:'B',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 p3 = b1.create('point',[-2,-3], {name:'C', size:4}); | ||
var p4 = b1.create('point',[-1,-1], {name:'D',size:4}); | var p4 = b1.create('point',[-1,-1], {name:'D', size:4}); | ||
var p5 = b1.create('point',[3,1], {name:'E',size:4}); | var p5 = b1.create('point',[3,1], {name:'E', size:4}); | ||
</source> | </source> | ||
Note that the " | 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 = | 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 = | 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: | ||
| Line 27: | Line 27: | ||
var p5 = b1.create('point',[3,1], {name:'E',size:4}); | var p5 = b1.create('point',[3,1], {name:'E',size:4}); | ||
var poly = b1.create('polygon',[p1,p2,p3,p4,p5] | var poly = b1.create('polygon',[p1,p2,p3,p4,p5], { borders:{strokeColor:'black'} }); | ||
</jsxgraph> | </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:
