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<title>3D circle sampler</title>
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<h1>3D circle sampler</h1>
<p>A <a href="https://jsxgraph.org/docs/symbols/Circle3D.html"><code>Circle3D</code></a> element is created from a center, a normal vector, and a radius. The center can be given either in coordinates or as a <a href="https://jsxgraph.org/docs/symbols/Point3D.html#constructor"><code>Point3D</code></a>. The normal vector is given in coordinates.</p>
<p>There’s another <a href="https://github.com/jsxgraph/jsxgraph/blob/main/examples/circle3d.html"><code>Circle3D</code> example</a> in the <a href="https://github.com/jsxgraph/jsxgraph/tree/main/examples">examples folder</a> included with the source code.</p>
<div id="circle-board" class="jxgbox" style="width:600px; height:600px"></div>
<script type="text/javascript">
// create a JSXGraph board and draw a 3D view on it
let board = JXG.JSXGraph.initBoard(
'circle-board',
{
boundingbox: [-8, 8, 8,-8],
axis: false,
showCopyright: false,
showNavigation: false
}
);
let view = board.create(
'view3d',
[[-4.5, -4.5], [9, 9],
[[0, 3], [0, 3], [0, 3]]],
{
xPlaneRear: {fillOpacity: 0.2, gradient: null},
yPlaneRear: {fillOpacity: 0.2, gradient: null},
zPlaneRear: {fillOpacity: 0.2, gradient: null}
}
);
// create a point
let center = view.create(
'point3d',
[1.5, 1.5, 1.5],
{
withLabel: false,
strokeWidth: 1,
size: 5,
strokeColor: '#300060',
fillColor: 'white',
gradientSecondColor: '#5000a0',
highlightStrokeColor: '#300060'
}
);
// create some circles that share a center
let normals = [
[1, 1, 1],
[1, -1, 1],
[-1, 1, 1],
[-1, -1, 1]
];
let colors = [
'#f08',
'#f60',
'#fb0',
'#80f'
];
for (i in normals) {
view.create(
'circle3d',
[center, normals[i], 1],
{strokeColor: colors[i]}
);
}
</script>
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