OdGeEllipCylinder Class

Class Hierarchy

Syntax

C++

class OdGeEllipCylinder : public OdGeSurface;

File

GeEllipCylinder.h

Description

This class represents cylinders with an elliptical cross-section.

Remarks

An elliptical cylinder is defined by:

major and minor radii
origin (a point on the axis of symmetry)
axis of symmetry
major axis
height
U parameter scale.

It is generated by a line parallel to the axis of symmetry, along an elliptical path.

The height interval of this elliptical cylinder is specified relative to its origin. Height increases in the direction of the symmetric axis. Height interval can be unbounded.

Parameter V is the angle of revolution, measured from the major axis to the axis of symmetry. The right hand rule is applied along the direction of the axis of symmetry for positive angles. For a closed cylinder, V defaults to [-OdaPI, OdaPI).

Parameter U varies along the generating line. U is dimensionless, measured in U parameter scale (which equals to the major radius by default). U increases in the direction of the axis of symmetry. However, if U parameter scale is negative, U decreases in the direction of the axis of symmetry. U = 0 corresponds to the base of this elliptical cylinder.

The surface of the cylinder is periodic in V with a period of Oda2PI.

[umin, umax] x [vmin, vmax] defines a four-sided cylindrical patch bounded by two straight lines (at vmin and vmax) and two circular arcs (at umin and umax). The following constraints apply to the definition of a cylindrical patch:

umin < umax
|vmax - vmin| <= Oda2PI
majorRadius > 0.0
minorRadius > 0.0

The angle of a point on an ellipse is measured by projecting the point along a vector perpendicular to the major axis onto a circle whose center is the center of this ellipse and whose radius is the major radius of this ellipse.

The angle between the major axis of the ellipse, and a vector from the center of the ellipse to the intersection point with the circle, measured counterclockwise, is the angle of the point on the ellipse.

Corresponding C++ library: TD_Ge

See Also

Working with Cylinders

Group

OdGe Classes

Public Methods

	Name	Description
	OdGeEllipCylinder	This is the overview for the OdGeEllipCylinder constructor overload.

OdGeEllipCylinder Methods

	Name	Description
	axisOfSymmetry	Returns the axis of symmetry of this cylinder.
	getAngles	Retrieves the starting and ending angles of this cylinder.
	getHeight	Retrieves the interval of the axis of symmetry.
	getUParamScale	Retrieves U parameter scale.
	heightAt	Returns the cylinder height that corresponds to the specified position on the U-axis.
	intersectWith	Checks if the cylinder intersects with a line entity, and returns the number of intersections and the points of intersection.
	isClosed	Checks if the base of this cylinder is a full ellipse within the specified tolerance.
	isOuterNormal	Checks if the normal to this surface is pointing outward.
	majorAxis	Returns the major axis of this cylinder.
	majorRadius	Returns the major radius of the cylinder.
	minorAxis	Returns the minor axis of this cylinder.
	minorRadius	Returns the minor radius of the cylinder.
	origin	Returns the origin of the cylinder.
	radiusRatio	Returns the ratio of the minor to major radius of the cylinder.
	set	This is the overview for the set method overload.
	setAngles	Sets the start and end angles of the elliptical cylinder.
	setHeight	Sets the height of the elliptical cylinder.
	setIsOuterNormal	Sets OuterNormal according to the parameter.
	setMajorRadius	Sets the major radius of the elliptical cylinder.
	setMinorRadius	Sets the minor radius of the elliptical cylinder.
	setUParamScale	Sets U parameter scale according to the parameter.

OdGeEllipCylinder Operators

	Name	Description
	=	Assignment operator for the OdGeEllipCylinder object.

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