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From Martin Beckett, "Modified osgGA::TrackballManipulator so that osgGA::GUIEventAdapter::SCROLL performs a zoom.

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Arbitrarily zooms 10% in/out for each click."

Note from Robert Osfield, flipped the orienation of the zoom to make the right mouse key zoom and the scroll wheel work in the same direction.
This commit is contained in:
Robert Osfield 2009-03-10 17:39:46 +00:00
parent a0a06c8b2a
commit 9cccd087a8
1 changed files with 32 additions and 16 deletions
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48
src/osgGA/TrackballManipulator.cpp
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@ -141,6 +141,7 @@ bool TrackballManipulator::handle(const GUIEventAdapter& ea,GUIActionAdapter& us
}
case(GUIEventAdapter::DRAG):
case(GUIEventAdapter::SCROLL):
{
addMouseEvent(ea);
if (calcMovement()) us.requestRedraw();
@ -244,26 +245,41 @@ void TrackballManipulator::computePosition(const osg::Vec3& eye,const osg::Vec3&
bool TrackballManipulator::calcMovement()
{
// return if less then two events have been added.
if (_ga_t0.get()==NULL || _ga_t1.get()==NULL) return false;
// mosue scroll is only a single event
if (_ga_t0.get()==NULL) return false;
float dx = _ga_t0->getXnormalized()-_ga_t1->getXnormalized();
float dy = _ga_t0->getYnormalized()-_ga_t1->getYnormalized();
float dx=0.0f;
float dy=0.0f;
unsigned int buttonMask=osgGA::GUIEventAdapter::NONE;
float distance = sqrtf(dx*dx + dy*dy);
// return if movement is too fast, indicating an error in event values or change in screen.
if (distance>0.5)
if (_ga_t0->getEventType()==GUIEventAdapter::SCROLL)
{
return false;
dy = _ga_t0->getScrollingMotion() == osgGA::GUIEventAdapter::SCROLL_DOWN ? -0.1 : 0.1;
buttonMask=GUIEventAdapter::SCROLL;
}
else
{
if (_ga_t1.get()==NULL) return false;
dx = _ga_t0->getXnormalized()-_ga_t1->getXnormalized();
dy = _ga_t0->getYnormalized()-_ga_t1->getYnormalized();
float distance = sqrtf(dx*dx + dy*dy);
// return if movement is too fast, indicating an error in event values or change in screen.
if (distance>0.5)
{
return false;
}
// return if there is no movement.
if (distance==0.0f)
{
return false;
}
buttonMask = _ga_t1->getButtonMask();
}
// return if there is no movement.
if (distance==0.0f)
{
return false;
}
unsigned int buttonMask = _ga_t1->getButtonMask();
if (buttonMask==GUIEventAdapter::LEFT_MOUSE_BUTTON)
{
@ -307,7 +323,7 @@ bool TrackballManipulator::calcMovement()
return true;
}
else if (buttonMask==GUIEventAdapter::RIGHT_MOUSE_BUTTON)
else if ((buttonMask==GUIEventAdapter::RIGHT_MOUSE_BUTTON) || (buttonMask==GUIEventAdapter::SCROLL))
{
// zoom model.