Here's my shot at using a subclassed Translate2DDragger to move actual
objects on a plane (without displaying any handles).
They key is to make the movable object a child of the dragger, and to
disallow the dragger to override the color of that child.
See attachment.
Christian
/* OpenSceneGraph example, osgmanipulator.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <osgViewer/Viewer>
#include <osgManipulator/Translate2DDragger>
#include <osg/ShapeDrawable>
#include <osg/MatrixTransform>
#include <osg/Geometry>
#include <osg/Material>
#include <osgGA/TrackballManipulator>
/**
* Dragger for performing 2D translation using the dragged object's own geometry.
* For this to work, make the object a child of the dragger.
*/
class My2DDragger : public osgManipulator::Translate2DDragger
{
public:
My2DDragger();
My2DDragger(osg::Node *node);
My2DDragger(osg::Node *node, const osg::Plane& plane);
META_OSGMANIPULATOR_Object(osgManipulator,My2DDragger)
void setupDefaultGeometry();
protected:
virtual ~My2DDragger();
};
My2DDragger::My2DDragger() : osgManipulator::Translate2DDragger() { setHandleEvents(true); }
My2DDragger::My2DDragger(osg::Node *node) : osgManipulator::Translate2DDragger() { addChild(node); setHandleEvents(true); }
My2DDragger::My2DDragger(osg::Node *node, const osg::Plane& plane) : osgManipulator::Translate2DDragger(plane) { addChild(node); setHandleEvents(true); }
My2DDragger::~My2DDragger() { }
void My2DDragger::setupDefaultGeometry() {}
/**
* create a scene with a mouse-movable cylinder object
*/
osg::Node* createDemoScene() {
osg::Group* root = new osg::Group;
osg::ref_ptr<osg::Geode> geode_cylinder = new osg::Geode;
const float radius = 0.8f;
const float height = 1.0f;
osg::ref_ptr<osg::TessellationHints> hints = new osg::TessellationHints;
hints->setDetailRatio(2.0f);
osg::ref_ptr<osg::ShapeDrawable> shape;
shape = new osg::ShapeDrawable(new osg::Cylinder(osg::Vec3(0.0f, 0.0f, 0.0f), radius, height), hints.get());
shape->setColor(osg::Vec4(1.0f, 0.3f, 0.3f, 1.0f));
geode_cylinder->addDrawable(shape.get());
// cylinder's material
osg::ref_ptr<osg::Material> material = new osg::Material;
material->setColorMode(osg::Material::DIFFUSE);
material->setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4(0, 0, 0, 1));
material->setSpecular(osg::Material::FRONT_AND_BACK, osg::Vec4(1, 1, 1, 1));
material->setShininess(osg::Material::FRONT_AND_BACK, 64.0f);
// don't let the dragger object change our material settings
root->getOrCreateStateSet()->setAttributeAndModes(material.get(), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
root->addChild(new My2DDragger( geode_cylinder.get(), osg::Plane(osg::Z_AXIS, 0.0f)));
return root;
}
int main( int argc, char **argv )
{
// construct the viewer.
osgViewer::Viewer viewer;
osg::ref_ptr<osg::Node> loadedModel = createDemoScene();
viewer.setSceneData(loadedModel.get());
viewer.setCameraManipulator(new osgGA::TrackballManipulator);
viewer.realize();
osgGA::CameraManipulator *cam = viewer.getCameraManipulator();
cam->setHomePosition(osg::Vec3f(0.0f, -10.0f, 5.0f), osg::Vec3f(0.0f, 0.0f, 0.0f), osg::Z_AXIS);
cam->home(0);
return viewer.run();
}
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