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Cylinder-sheet projector. More...
#include <Inventor/projectors/SbCylinderSheetProjector.h>
Public Member Functions | |
SbCylinderSheetProjector (SbBool orientToEye=TRUE) | |
SbCylinderSheetProjector (const SbCylinder &cyl, SbBool orientToEye=TRUE) | |
Constructors. | |
~SbCylinderSheetProjector () | |
Destructor. | |
virtual SbProjector * | copy () const |
Returns an instance that is a copy of this instance. | |
virtual SbVec3f | project (const SbVec2f &point) |
Apply the projector using the given point, 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. | |
Protected Member Functions | |
virtual void | setupPlane () |
Sets up the tolerance plane. | |
Protected Attributes | |
SbVec3f | workingProjPoint |
The projection point in working space. | |
SbVec3f | planeDir |
Information about the plane used for intersection testing. | |
SbPlane | tolPlane |
the plane itself |
SbCylinderSheetProjector projects a window space point (usually based on the mouse location) onto the surface of a cylinder with a hyperbolic sheet draped over it. This allows smooth transitions onto and off of the cylinder. Two projected points can produce a rotation along the cylinder's axis. When the mouse position projects on to the sheet, the rotations will be as if the sheet 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.
Definition at line 89 of file SbCylinderSheetProjector.h.
SbCylinderSheetProjector::SbCylinderSheetProjector | ( | SbBool | orientToEye = TRUE | ) |
SbCylinderSheetProjector::SbCylinderSheetProjector | ( | const SbCylinder & | cyl, |
SbBool | orientToEye = TRUE |
||
) |
The first uses a default cylinder aligned with the Y axis with radius 1.0; the cylinder is supplied in the second. The orientToEye parameter determines whether the sheet 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.
SbCylinderSheetProjector::~SbCylinderSheetProjector | ( | ) | [inline] |
Definition at line 110 of file SbCylinderSheetProjector.h.
virtual SbProjector* SbCylinderSheetProjector::copy | ( | ) | const [virtual] |
The caller is responsible for deleting the copy when done.
Implements SbProjector.
virtual SbRotation SbCylinderSheetProjector::getRotation | ( | const SbVec3f & | point1, |
const SbVec3f & | point2 | ||
) | [virtual] |
Implements SbCylinderProjector.
The point should be normalized from 0-1, with (0,0) at the lower-left.
Implements SbCylinderProjector.
virtual void SbCylinderSheetProjector::setupPlane | ( | ) | [protected, virtual] |
SbVec3f SbCylinderSheetProjector::planeDir [protected] |
normal direction
Definition at line 134 of file SbCylinderSheetProjector.h.
SbPlane SbCylinderSheetProjector::tolPlane [protected] |
Definition at line 135 of file SbCylinderSheetProjector.h.
SbVec3f SbCylinderSheetProjector::workingProjPoint [protected] |
Definition at line 131 of file SbCylinderSheetProjector.h.