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Intersection path-polygon
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<iframe 
    src="http://jsxgraph.uni-bayreuth.de/share/iframe/intersection-path-polygon" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Intersection path-polygon" 
    allowfullscreen
></iframe>
This code has to 
<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 1 / 1; width: 100%;" data-ar="1 / 1"></div>
</div>

<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution 4.0 International License.
    https://creativecommons.org/licenses/by/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    var board = JXG.JSXGraph.initBoard(BOARDID, {
        axis: true,
        boundingbox: [-5, 5, 5, -5]
    });
    
    var curve1 = board.create('curve', [
        [-3, 3, 0, -3],
        [3, 3, 0, 3]
    ], {strokeColor: 'black', fillColor: 'none', fillOpacity: 0.8});
    
    var curve2 = board.create('polygon', [
        [3, 4],
        [-4, 0],
        [-4, 4]
    ], {strokeColor: 'blue', fillColor: 'red', fillOpacity: 0.3});
    
    var clip_path = board.create('curveintersection', [curve1, curve2], {
        strokeWidth: 3,
        fillColor: 'yellow',
        fillOpacity: 0.6
    });
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution 4.0 International License.
https://creativecommons.org/licenses/by/4.0/

Please note you have to mention 
The Center of Mobile Learning with Digital Technology
in the credits.
*/

const BOARDID = 'your_div_id'; // Insert your id here!

var board = JXG.JSXGraph.initBoard(BOARDID, {
    axis: true,
    boundingbox: [-5, 5, 5, -5]
});

var curve1 = board.create('curve', [
    [-3, 3, 0, -3],
    [3, 3, 0, 3]
], {strokeColor: 'black', fillColor: 'none', fillOpacity: 0.8});

var curve2 = board.create('polygon', [
    [3, 4],
    [-4, 0],
    [-4, 4]
], {strokeColor: 'blue', fillColor: 'red', fillOpacity: 0.3});

var clip_path = board.create('curveintersection', [curve1, curve2], {
    strokeWidth: 3,
    fillColor: 'yellow',
    fillOpacity: 0.6
});
<jsxgraph width="100%" aspect-ratio="1 / 1" title="Intersection path-polygon" description="This construction was copied from JSXGraph examples database: BTW HERE SHOULD BE A GENERATED LINKuseGlobalJS="false">
   /*
   This example is licensed under a 
   Creative Commons Attribution 4.0 International License.
   https://creativecommons.org/licenses/by/4.0/
   
   Please note you have to mention 
   The Center of Mobile Learning with Digital Technology
   in the credits.
   */
   
   var board = JXG.JSXGraph.initBoard(BOARDID, {
       axis: true,
       boundingbox: [-5, 5, 5, -5]
   });
   
   var curve1 = board.create('curve', [
       [-3, 3, 0, -3],
       [3, 3, 0, 3]
   ], {strokeColor: 'black', fillColor: 'none', fillOpacity: 0.8});
   
   var curve2 = board.create('polygon', [
       [3, 4],
       [-4, 0],
       [-4, 4]
   ], {strokeColor: 'blue', fillColor: 'red', fillOpacity: 0.3});
   
   var clip_path = board.create('curveintersection', [curve1, curve2], {
       strokeWidth: 3,
       fillColor: 'yellow',
       fillOpacity: 0.6
   });
</jsxgraph>
// Define the id of your board in BOARDID

var board = JXG.JSXGraph.initBoard(BOARDID, {
    axis: true,
    boundingbox: [-5, 5, 5, -5]
});

var curve1 = board.create('curve', [
    [-3, 3, 0, -3],
    [3, 3, 0, 3]
], {strokeColor: 'black', fillColor: 'none', fillOpacity: 0.8});

var curve2 = board.create('polygon', [
    [3, 4],
    [-4, 0],
    [-4, 4]
], {strokeColor: 'blue', fillColor: 'red', fillOpacity: 0.3});

var clip_path = board.create('curveintersection', [curve1, curve2], {
    strokeWidth: 3,
    fillColor: 'yellow',
    fillOpacity: 0.6
});

license

This example is licensed under a Creative Commons Attribution 4.0 International License.
Please note you have to mention The Center of Mobile Learning with Digital Technology in the credits.