NAME

SbCylinderPlaneProjector — cylinder-plane projector

INHERITS FROM

SbProjector > SbCylinderProjector > SbCylinderSectionProjector > SbCylinderPlaneProjector

SYNOPSIS

#include <Inventor/projectors/SbCylinderPlaneProjector.h>

Methods from class SbCylinderPlaneProjector:

SbCylinderPlaneProjector(float edgeTol = .9, SbBool orientToEye = TRUE)

SbCylinderPlaneProjector(const SbCylinder &cyl, float edgeTol = .9, SbBool orientToEye = TRUE)

~SbCylinderPlaneProjector()

Methods from class SbCylinderSectionProjector:

void setTolerance(float edgeTol)

float getTolerance() const

SbBool isWithinTolerance(const SbVec3f &point)

Methods from class SbCylinderProjector:

SbVec3f projectAndGetRotation(const SbVec2f &point, SbRotation &rot)

virtual SbRotation getRotation(const SbVec3f &point1, const SbVec3f &point2)

void setCylinder(const SbCylinder &cyl)

const SbCylinder & getCylinder() const

void setOrientToEye(SbBool orientToEye)

SbBool isOrientToEye() const

void setFront(SbBool isFront)

SbBool isFront() const

SbBool isPointInFront(const SbVec3f &point) const

Methods from class SbProjector:

virtual SbVec3f project(const SbVec2f &point)

virtual void setViewVolume(const SbViewVolume &vol)

const SbViewVolume & getViewVolume() const

virtual void setWorkingSpace(const SbMatrix &space)

const SbMatrix & getWorkingSpace() const

virtual SbProjector * copy() const

DESCRIPTION

SbCylinderPlaneProjector projects a window space point (usually based on the mouse location) onto a surface defined by a cylinder and plane cutting through the cylinder. Two projected points can produce a rotation along the cylinder's axis. When the mouse position projects onto the plane, the rotations will be as if the plane is being dragged, causing the cylinder to roll beneath it.

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

METHODS

SbCylinderPlaneProjector(float edgeTol = .9, SbBool orientToEye = TRUE)

SbCylinderPlaneProjector(const SbCylinder &cyl, float edgeTol = .9, SbBool orientToEye = TRUE)

Constructors. The first uses a default cylinder aligned with the Y axis with radius 1.0; the cylinder is supplied in the second. The position of the plane 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 .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.

~SbCylinderPlaneProjector()

Destructor.

SEE ALSO

SbCylinderSheetProjector, SbLineProjector, SbPlaneProjector, SbSpherePlaneProjector, SbSphereProjector, SbSphereSectionProjector, SbSphereSheetProjector