Cylinder-section projector. More...

#include <Inventor/projectors/SbCylinderSectionProjector.h>

Inheritance diagram for SbCylinderSectionProjector:

Public Member Functions
	SbCylinderSectionProjector (float edgeTol=0.9f, SbBool orientToEye=TRUE)
	Constructor that uses a default cylinder aligned with the Y axis with radius 1.0.

	SbCylinderSectionProjector (const SbCylinder &cyl, float edgeTol=0.9f, SbBool orientToEye=TRUE)
	Constructor.

	~SbCylinderSectionProjector ()
	Destructor.

virtual SbProjector *	copy () const
	Returns an instance that is a copy of this instance.

virtual SbVec3f	project (const SbVec2f &point)
	Applies the projector using the given point, returning the point in three dimensions that it projects to.

virtual SbVec3f	intersect (const SbLine &line)
	Applies the projector using the given line in world coordinates, returning the point in three dimensions that it projects to.

virtual SbRotation	getRotation (const SbVec3f &point1, const SbVec3f &point2)
	Computes a rotation based on two points on this projector.

void	setTolerance (float edgeTol)
	Sets the edge tolerance as a fraction of the radius of the cylinder.

float	getTolerance () const
	Gets the edge tolerance as a fraction of the radius of the cylinder.

SbBool	isWithinTolerance (const SbVec3f &point)
	Finds whether this point on the cylinder or tolerance plane is within tolerance.

Public Member Functions inherited from SbCylinderProjector
virtual	~SbCylinderProjector ()
	Destructor.

SbVec3f	projectAndGetRotation (const SbVec2f &point, SbRotation &rot)
	Applies the projector using the given point, returning the point in three dimensions that it projects to.

void	setCylinder (const SbCylinder &cyl)
	Sets the cylinder on which to project points.

const SbCylinder &	getCylinder () const
	Gets the cylinder on which to project points.

void	setOrientToEye (SbBool orientToEye)
	Sets whether the projector should always be oriented towards the eye.

SbBool	isOrientToEye () const
	Gets whether the projector should always be oriented towards the eye.

void	setFront (SbBool isFront)
	Sets whether the projector should intersect the half of the cylinder that faces the eye.

SbBool	isFront () const
	Gets whether the projector should intersect the half of the cylinder that faces the eye.

SbBool	isPointInFront (const SbVec3f &point) const
	Gets whether the projector should intersect the half of the cylinder that faces the eye.

virtual void	setWorkingSpace (const SbMatrix &space)
	Sets the transform space to work in.

Public Member Functions inherited from SbProjector
virtual	~SbProjector ()
	Destructor.

virtual void	setViewVolume (const SbViewVolume &vol)
	Set the view volume to use for the projection.

const SbViewVolume &	getViewVolume () const
	Get the view volume to use for the projection.

const SbMatrix &	getWorkingSpace () const
	Get the transform space to work in.

Detailed Description

Cylinder-section projector.

SbCylinderSectionProjector projects a window space point (usually based on the mouse location) onto the section of a cylinder that has been sliced by a plane. Two projected points can produce a rotation along the cylinder's axis. The tolerance slice can be specified as a fraction of the radius of the cylinder. The projection point will not extend beyond the sliced portion of the cylinder.

Incremental changes (delta rotation) can be computed during interactive sessions. Cylinder projectors are typically used to write interactive 3D manipulators and viewers.

Constructor & Destructor Documentation

◆ SbCylinderSectionProjector() [1/2]

SbCylinderSectionProjector::SbCylinderSectionProjector	(	float	edgeTol = `0.9f`,
		SbBool	orientToEye = `TRUE`
	)

Constructor that uses a default cylinder aligned with the Y axis with radius 1.0.

The position of the plane which slices the cylinder into a section is specified as a fraction of the cylinder radius with the parameter edgeTol. A tolerance value of 1.0 positions the plane down the center of the cylinder. A tolerance value of 0.5 defines the longitudinal plane halfway between the center and the outside edge of the cylinder. The default value is 0.9, so that almost half the cylinder is in front of the plane. The orientToEye parameter determines whether the plane is perpendicular to the eye, or perpendicular to the cylinder's Z axis. Setting that parameter to TRUE (the default) specifies that the plane be perpendicular to the eye, which is most often the desired behavior.

The default view volume is undefined, and the working space is identity.

◆ SbCylinderSectionProjector() [2/2]

SbCylinderSectionProjector::SbCylinderSectionProjector	(	const SbCylinder &	cyl,
		float	edgeTol = `0.9f`,
		SbBool	orientToEye = `TRUE`
	)

Constructor.

The position of the plane which slices the cylinder into a section is specified as a fraction of the cylinder radius with the parameter edgeTol. A tolerance value of 1.0 positions the plane down the center of the cylinder. A tolerance value of 0.5 defines the longitudinal plane halfway between the center and the outside edge of the cylinder. The default value is 0.9, so that almost half the cylinder is in front of the plane. The orientToEye parameter determines whether the plane is perpendicular to the eye, or perpendicular to the cylinder's Z axis. Setting that parameter to TRUE (the default) specifies that the plane be perpendicular to the eye, which is most often the desired behavior.

The default view volume is undefined, and the working space is identity.