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From Mason Menninger, addition of setTrackballSize() parameter.

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This commit is contained in:
Robert Osfield 2005-01-22 16:55:48 +00:00
parent 0fd06a93ec
commit 89236b46fd
2 changed files with 21 additions and 5 deletions
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7
include/osgGA/TrackballManipulator
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@ -77,6 +77,12 @@ class OSGGA_EXPORT TrackballManipulator : public MatrixManipulator
/** Get the keyboard and mouse usage of this manipulator.*/
virtual void getUsage(osg::ApplicationUsage& usage) const;
/** Set the size of the trackball. */
void setTrackballSize(float size);
/** Get the size of the trackball. */
float getTrackballSize() const { return _trackballSize; }
protected:
virtual ~TrackballManipulator();
@ -114,6 +120,7 @@ class OSGGA_EXPORT TrackballManipulator : public MatrixManipulator
osg::Vec3d _center;
osg::Quat _rotation;
double _distance;
float _trackballSize;
};

19
src/osgGA/TrackballManipulator.cpp
View File

@ -1,6 +1,7 @@
#include <osgGA/TrackballManipulator>
#include <osg/Quat>
#include <osg/Notify>
#include <osg/BoundsChecking>
using namespace osg;
using namespace osgGA;
@ -12,6 +13,7 @@ TrackballManipulator::TrackballManipulator()
_thrown = false;
_distance = 1.0f;
_trackballSize = 0.8f;
}
@ -230,7 +232,10 @@ bool TrackballManipulator::calcMovement()
// return if there is no movement.
if (dx==0 && dy==0) return false;
if (dx==0.0f && dy==0.0f)
{
return false;
}
unsigned int buttonMask = _ga_t1->getButtonMask();
if (buttonMask==GUIEventAdapter::LEFT_MOUSE_BUTTON)
@ -319,7 +324,11 @@ bool TrackballManipulator::calcMovement()
* simple example, though, so that is left as an Exercise for the
* Programmer.
*/
const float TRACKBALLSIZE = 0.8f;
void TrackballManipulator::setTrackballSize(float size)
{
_trackballSize = size;
osg::clampBetweenRange(_trackballSize,0.1f,1.0f,"TrackballManipulator::setTrackballSize(float)");
}
/*
* Ok, simulate a track-ball. Project the points onto the virtual
@ -347,8 +356,8 @@ void TrackballManipulator::trackball(osg::Vec3& axis,float& angle, float p1x, fl
osg::Vec3 sv = osg::Vec3(1.0f,0.0f,0.0f)*rotation_matrix;
osg::Vec3 lv = osg::Vec3(0.0f,0.0f,-1.0f)*rotation_matrix;
osg::Vec3 p1 = sv*p1x+uv*p1y-lv*tb_project_to_sphere(TRACKBALLSIZE,p1x,p1y);
osg::Vec3 p2 = sv*p2x+uv*p2y-lv*tb_project_to_sphere(TRACKBALLSIZE,p2x,p2y);
osg::Vec3 p1 = sv * p1x + uv * p1y - lv * tb_project_to_sphere(_trackballSize, p1x, p1y);
osg::Vec3 p2 = sv * p2x + uv * p2y - lv * tb_project_to_sphere(_trackballSize, p2x, p2y);
/*
* Now, we want the cross product of P1 and P2
@ -366,7 +375,7 @@ axis = p2^p1;
/*
* Figure out how much to rotate around that axis.
*/
float t = (p2-p1).length() / (2.0*TRACKBALLSIZE);
float t = (p2 - p1).length() / (2.0 * _trackballSize);
/*
* Avoid problems with out-of-control values...