JSXGraph
JSXGraph share

Share

Circle with ticks
QR code 
<iframe 
    src="https://www.jsxgraph.org/share/iframe/circle-with-ticks" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Circle with ticks" 
    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';

    const board = JXG.JSXGraph.initBoard(BOARDID, {
        axis: false,
        boundingbox: [-5, 5, 5, -5],
        keepaspectratio: true
    });
    
    // Circle through q with center p.
    var p = board.create('point', [0, 0]);
    var q = board.create('point', [3, 3]);
    var circ = board.create('circle', [p, q]);
    
    // Create an empty curve
    var ticks = board.create('curve', [
        [0],
        [0]
    ], {
        strokeWidth: 1,
        strokeColor: 'blue',
        strokeOpacity: 0.5
    });
    
    // Make ticks out of the curve 
    ticks.updateDataArray = function() {
        var cx = circ.center.X(),
            cy = circ.center.Y(),
            r = circ.Radius(),
            i,
            ticklen = 0.3, // Length of ticks in user space coordinates
            steps = 20, // Number of ticks
            d = ticklen * 0.5,
            alpha = 2 * Math.PI / steps; // Angle between ticks
    
        this.dataX = [];
        this.dataY = [];
        for (i = 0; i < steps; i++) {
            // Start of a tick
            this.dataX.push(cx + (r - d) * Math.cos(i * alpha));
            this.dataY.push(cy + (r - d) * Math.sin(i * alpha));
            // End of tick
            this.dataX.push(cx + (r + d) * Math.cos(i * alpha));
            this.dataY.push(cy + (r + d) * Math.sin(i * alpha));
            // Interrupt the curve
            this.dataX.push(NaN);
            this.dataY.push(NaN);
        }
    };
    board.update();
 </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!

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

// Circle through q with center p.
var p = board.create('point', [0, 0]);
var q = board.create('point', [3, 3]);
var circ = board.create('circle', [p, q]);

// Create an empty curve
var ticks = board.create('curve', [
    [0],
    [0]
], {
    strokeWidth: 1,
    strokeColor: 'blue',
    strokeOpacity: 0.5
});

// Make ticks out of the curve 
ticks.updateDataArray = function() {
    var cx = circ.center.X(),
        cy = circ.center.Y(),
        r = circ.Radius(),
        i,
        ticklen = 0.3, // Length of ticks in user space coordinates
        steps = 20, // Number of ticks
        d = ticklen * 0.5,
        alpha = 2 * Math.PI / steps; // Angle between ticks

    this.dataX = [];
    this.dataY = [];
    for (i = 0; i < steps; i++) {
        // Start of a tick
        this.dataX.push(cx + (r - d) * Math.cos(i * alpha));
        this.dataY.push(cy + (r - d) * Math.sin(i * alpha));
        // End of tick
        this.dataX.push(cx + (r + d) * Math.cos(i * alpha));
        this.dataY.push(cy + (r + d) * Math.sin(i * alpha));
        // Interrupt the curve
        this.dataX.push(NaN);
        this.dataY.push(NaN);
    }
};
board.update();
<jsxgraph width="100%" aspect-ratio="1 / 1" title="Circle with ticks" 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.
   */
   
   const board = JXG.JSXGraph.initBoard(BOARDID, {
       axis: false,
       boundingbox: [-5, 5, 5, -5],
       keepaspectratio: true
   });
   
   // Circle through q with center p.
   var p = board.create('point', [0, 0]);
   var q = board.create('point', [3, 3]);
   var circ = board.create('circle', [p, q]);
   
   // Create an empty curve
   var ticks = board.create('curve', [
       [0],
       [0]
   ], {
       strokeWidth: 1,
       strokeColor: 'blue',
       strokeOpacity: 0.5
   });
   
   // Make ticks out of the curve 
   ticks.updateDataArray = function() {
       var cx = circ.center.X(),
           cy = circ.center.Y(),
           r = circ.Radius(),
           i,
           ticklen = 0.3, // Length of ticks in user space coordinates
           steps = 20, // Number of ticks
           d = ticklen * 0.5,
           alpha = 2 * Math.PI / steps; // Angle between ticks
   
       this.dataX = [];
       this.dataY = [];
       for (i = 0; i < steps; i++) {
           // Start of a tick
           this.dataX.push(cx + (r - d) * Math.cos(i * alpha));
           this.dataY.push(cy + (r - d) * Math.sin(i * alpha));
           // End of tick
           this.dataX.push(cx + (r + d) * Math.cos(i * alpha));
           this.dataY.push(cy + (r + d) * Math.sin(i * alpha));
           // Interrupt the curve
           this.dataX.push(NaN);
           this.dataY.push(NaN);
       }
   };
   board.update();
</jsxgraph>
Add ticks to the circle line. The ticks are realized as a single curve. It is divided into short segments by adding `NaN`s.
// Define the id of your board in BOARDID

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

// Circle through q with center p.
var p = board.create('point', [0, 0]);
var q = board.create('point', [3, 3]);
var circ = board.create('circle', [p, q]);

// Create an empty curve
var ticks = board.create('curve', [
    [0],
    [0]
], {
    strokeWidth: 1,
    strokeColor: 'blue',
    strokeOpacity: 0.5
});

// Make ticks out of the curve 
ticks.updateDataArray = function() {
    var cx = circ.center.X(),
        cy = circ.center.Y(),
        r = circ.Radius(),
        i,
        ticklen = 0.3, // Length of ticks in user space coordinates
        steps = 20, // Number of ticks
        d = ticklen * 0.5,
        alpha = 2 * Math.PI / steps; // Angle between ticks

    this.dataX = [];
    this.dataY = [];
    for (i = 0; i < steps; i++) {
        // Start of a tick
        this.dataX.push(cx + (r - d) * Math.cos(i * alpha));
        this.dataY.push(cy + (r - d) * Math.sin(i * alpha));
        // End of tick
        this.dataX.push(cx + (r + d) * Math.cos(i * alpha));
        this.dataY.push(cy + (r + d) * Math.sin(i * alpha));
        // Interrupt the curve
        this.dataX.push(NaN);
        this.dataY.push(NaN);
    }
};
board.update();

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.