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Epitrochoid(outerRadius, rollerRadius, distFromRollerCenter, [rotationDegrees])

Augments: Curve

A curve evaluator object for a curve drawn by a circle that rolls along the outside of another circle, whose position is fixed, with a center of (0,0). The rolling circle will start at the positive X axis of the fixed circle.

The following curves can be generated with this class (in the following descriptions, O = outerRadius, R means rollerRadius, and D = distFromRollerCenter).

This class is considered a supplementary class to the Public Domain HTML 3D Library and is not considered part of that library.

To use this class, you must include the script "extras/evaluators.js"; the class is not included in the "h3du_min.js" file which makes up the HTML 3D Library. Example:

<script type="text/javascript" src="extras/evaluators.js"></script>




Gets the endpoints of this curve. For this curve evaluator object, the curve starts at 0 and ends at π*2.

Return Value

An array containing the two endpoints of the curve. The first number is the start of the curve, and the second number is the end of the curve. * (Type: Array.<number>)


Generates a point on the curve from the given U coordinate.


Return Value

A 3-element array specifying a 3D point. Only the X and Y coordinates will be other than 0. (Type: Array.<number>)


Creates a modified version of this curve so that it fits the given radius.


Return Value

Return value. (Type: Epitrochoid)

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