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From Chuck Seberino, "Attached are modified versions of RotateCylinderDragger and Projector files that clean up the use of _onCylinder / isProjectionOnCylinder().

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I have also made changes to the RotateCylinderDragger to provide a cylinder ring with a thickness.   It is totally optional, but IMHO makes the default behavior work better than a solid cylinder (which typically obscures the geometry you are trying to drag).  Gives it a bit more to grab, especially in the case where eyepoint and cylinder axis are near parallel.
"
remotes/origin/OpenSceneGraph-3.2
Robert Osfield 13 years ago
parent fc6fdeaa2c
commit 5e105d2fc4
5 changed files with 95 additions and 15 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2012-03-08 16:33 robert
* CMakeLists.txt, ChangeLog, include/osg/Version: Updated version
number for 3.1.1 dev release
2012-03-08 16:05 robert
* include/osg/Image, src/osg/Image.cpp: From Farshid Lashkari,

21
include/osgManipulator/Projector
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@ -263,7 +263,11 @@ class OSGMANIPULATOR_EXPORT CylinderProjector : public Projector
};
/**
* CylinderPlaneProjector projects points onto the given cylinder.
* CylinderPlaneProjector projects a point onto a plane relative to the
* given cylinder. For most cases, the plane will be parallel to the
* cylinder axis oriented towards the eyepoint. When the eyepoint and
* cylinder axis are close to parallel, then it will project onto a plane
* perpendicular to the cylinder.
*/
class OSGMANIPULATOR_EXPORT CylinderPlaneProjector : public CylinderProjector
{
@ -277,23 +281,26 @@ class OSGMANIPULATOR_EXPORT CylinderPlaneProjector : public CylinderProjector
* Calculates the object coordinates (projectedPoint) of a window
* coordinate (pointToProject) when projected onto the given plane.
* Returns true on successful projection.
* \param[in] pi Incoming intersection information
* \param[out] projectedPoint Point located on the given plane
* \return bool Whether the projection onto the plane was successful.
*/
virtual bool project(const PointerInfo& pi, osg::Vec3d& projectedPoint) const;
/**
* Returns true if the previous projection was on the cylinder and
* false if the projection was on the plane.
* Generates a rotation about the cylinder axis based upon the incoming
* projected points on the plane computed from project().
* \param[in] p1 Initial projection point
* \param[in] p2 Second projection point
* \return osg::Quat Rotation about cylinder axis
*/
bool isProjectionOnCylinder() const { return _onCylinder; }
osg::Quat getRotation(const osg::Vec3d& p1, bool p1OnCyl, const osg::Vec3d& p2, bool p2OnCyl) const;
osg::Quat getRotation(const osg::Vec3d& p1, const osg::Vec3d& p2) const;
protected:
virtual ~CylinderPlaneProjector();
mutable osg::Plane _plane;
mutable bool _onCylinder;
mutable osg::Vec3d _planeLineStart, _planeLineEnd;
mutable bool _parallelPlane;
};

1
include/osgManipulator/RotateCylinderDragger
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@ -59,7 +59,6 @@ class OSGMANIPULATOR_EXPORT RotateCylinderDragger : public Dragger
osg::ref_ptr<CylinderPlaneProjector> _projector;
osg::Vec3d _prevWorldProjPt;
bool _prevPtOnCylinder;
osg::Matrix _startLocalToWorld, _startWorldToLocal;
osg::Quat _prevRotation;

4
src/osgManipulator/Projector.cpp
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@ -560,7 +560,7 @@ CylinderPlaneProjector::CylinderPlaneProjector()
{
}
CylinderPlaneProjector::CylinderPlaneProjector(osg::Cylinder* cylinder) : CylinderProjector(cylinder)
CylinderPlaneProjector::CylinderPlaneProjector(osg::Cylinder* cylinder) : CylinderProjector(cylinder), _parallelPlane(false)
{
}
@ -597,7 +597,7 @@ bool CylinderPlaneProjector::project(const PointerInfo& pi, osg::Vec3d& projecte
return true;
}
osg::Quat CylinderPlaneProjector::getRotation(const osg::Vec3d& p1, bool p1OnCyl, const osg::Vec3d& p2, bool p2OnCyl) const
osg::Quat CylinderPlaneProjector::getRotation(const osg::Vec3d& p1, const osg::Vec3d& p2) const
{
if(_parallelPlane)
{

79
src/osgManipulator/RotateCylinderDragger.cpp
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@ -22,6 +22,49 @@
using namespace osgManipulator;
namespace
{
//------------------------------------------------------------------------------
osg::Geometry* createDiskGeometry(float radius, float offset, float z, unsigned int numSegments
)
{
const float angleDelta = 2.0f*osg::PI/float(numSegments);
const unsigned int numPoints = (numSegments+1) * 2;
float angle = 0.0f;
osg::Vec3Array* vertexArray = new osg::Vec3Array(numPoints);
osg::Vec3Array* normalArray = new osg::Vec3Array(numPoints);
unsigned int p = 0;
for(unsigned int i = 0; i < numSegments; ++i,angle+=angleDelta)
{
float c = cosf(angle);
float s = sinf(angle);
// Outer point
(*vertexArray)[p].set(radius*c, radius*s, z);
(*normalArray)[p].set(0.0, 0.0, -1.0);
++p;
// Inner point
(*vertexArray)[p].set((radius-offset)*c, (radius-offset)*s, z);
(*normalArray)[p].set(0.0, 0.0, -1.0);
++p;
}
// do last points by hand to ensure no round off errors.
(*vertexArray)[p] = (*vertexArray)[0];
(*normalArray)[p] = (*normalArray)[0];
++p;
(*vertexArray)[p] = (*vertexArray)[1];
(*normalArray)[p] = (*normalArray)[1];
osg::Geometry* geometry = new osg::Geometry;
geometry->setVertexArray(vertexArray);
geometry->setNormalArray(normalArray);
geometry->setNormalBinding(osg::Geometry::BIND_PER_VERTEX);
geometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_STRIP, 0, vertexArray->size()));
return geometry;
}
}
RotateCylinderDragger::RotateCylinderDragger()
{
_projector = new CylinderPlaneProjector();
@ -73,7 +116,6 @@ bool RotateCylinderDragger::handle(const PointerInfo& pointer, const osgGA::GUIE
_prevWorldProjPt = projectedPoint * _projector->getLocalToWorld();
_prevRotation = osg::Quat();
_prevPtOnCylinder = _projector->isProjectionOnCylinder();
aa.requestRedraw();
}
@ -91,8 +133,8 @@ bool RotateCylinderDragger::handle(const PointerInfo& pointer, const osgGA::GUIE
if (_projector->project(pointer, projectedPoint))
{
osg::Vec3d prevProjectedPoint = _prevWorldProjPt * _projector->getWorldToLocal();
osg::Quat deltaRotation = _projector->getRotation(prevProjectedPoint, _prevPtOnCylinder,
projectedPoint, _projector->isProjectionOnCylinder());
osg::Quat deltaRotation = _projector->getRotation(prevProjectedPoint,
projectedPoint);
osg::Quat rotation = deltaRotation * _prevRotation;
// Generate the motion command.
@ -106,7 +148,6 @@ bool RotateCylinderDragger::handle(const PointerInfo& pointer, const osgGA::GUIE
_prevWorldProjPt = projectedPoint * _projector->getLocalToWorld();
_prevRotation = rotation;
_prevPtOnCylinder = _projector->isProjectionOnCylinder();
aa.requestRedraw();
}
return true;
@ -138,6 +179,34 @@ bool RotateCylinderDragger::handle(const PointerInfo& pointer, const osgGA::GUIE
void RotateCylinderDragger::setupDefaultGeometry()
{
osg::Geode* geode = new osg::Geode;
geode->addDrawable(new osg::ShapeDrawable(const_cast<osg::Cylinder*>(_projector->getCylinder())));
{
osg::TessellationHints* hints = new osg::TessellationHints;
hints->setCreateTop(false);
hints->setCreateBottom(false);
hints->setCreateBackFace(false);
float radius = 1.0f;
float height = 0.1f;
float thickness = 0.1f;
// outer cylinder
osg::Cylinder* cylinder = new osg::Cylinder;
cylinder->setHeight(height);
cylinder->setRadius(radius);
osg::ShapeDrawable* cylinderDrawable = new osg::ShapeDrawable(cylinder, hints);
geode->addDrawable(cylinderDrawable);
// inner cylinder
osg::Cylinder* cylinder1 = const_cast<osg::Cylinder*>(_projector->getCylinder());
cylinder1->setHeight(height);
cylinder1->setRadius(radius-thickness);
osg::ShapeDrawable* cylinderDrawable1 = new osg::ShapeDrawable(cylinder1, hints);
geode->addDrawable(cylinderDrawable1);
// top
geode->addDrawable(createDiskGeometry(radius, thickness, height/2, 100));
// bottom
geode->addDrawable(createDiskGeometry(radius, thickness, -height/2, 100));
}
addChild(geode);
}

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