cgal/Polyhedron/demo/Polyhedron/Plugins/PCA/Trivial_plugin.cpp

#include <QtCore/qglobal.h>

#include <CGAL/Three/Scene_item.h>
#include <CGAL/Three/Scene_interface.h>
#include <CGAL/gl.h>

#include <CGAL/Three/Viewer_interface.h>
#include <QAction>
#include <QMainWindow>
#include <QApplication>

class Q_DECL_EXPORT Scene_bbox_item : public CGAL::Three::Scene_item
{
    Q_OBJECT
public:
    Scene_bbox_item(const CGAL::Three::Scene_interface* scene_interface)
        :  Scene_item(1,1), scene(scene_interface)

    {
        positions_lines.resize(0);
        are_buffers_filled = false;
    }
    ~Scene_bbox_item()
    {
    }
    bool isFinite() const { return true; }
    bool isEmpty() const { return true; }
    void compute_bbox() const { _bbox = scene->bbox(); }

    Scene_bbox_item* clone() const {
        return 0;
    }

    QString toolTip() const {
        const Bbox& bb = scene->bbox();
        return QString("<p><b>Scene bounding box</b></p>"
                       "<p>x range: (%1, %2)<br />"
                       "y range: (%3, %4)<br />"
                       "z range: (%5, %6)</p>")
                .arg(bb.xmin()).arg(bb.xmax())
                .arg(bb.ymin()).arg(bb.ymax())
                .arg(bb.zmin()).arg(bb.zmax());
    }

    // Indicate if rendering mode is supported
    bool supportsRenderingMode(RenderingMode m) const {
        return (m == Wireframe);
    }

    void drawEdges(CGAL::Three::Viewer_interface* viewer) const
    {
        if(!are_buffers_filled)
        {
            computeElements();
            initializeBuffers(viewer);
        }
        vaos[0]->bind();
        program = getShaderProgram(PROGRAM_WITHOUT_LIGHT);
        attribBuffers(viewer, PROGRAM_WITHOUT_LIGHT);
        program->bind();
        program->setAttributeValue("colors", this->color());
        viewer->glDrawArrays(GL_LINES, 0, static_cast<GLsizei>(positions_lines.size()/3));
        vaos[0]->release();
        program->release();

    }

    void invalidateOpenGLBuffers()
    {
        compute_bbox();
        are_buffers_filled = false;
    }

private:

    mutable std::vector<float> positions_lines;
    mutable QOpenGLShaderProgram *program;
    using CGAL::Three::Scene_item::initializeBuffers;
    void initializeBuffers(CGAL::Three::Viewer_interface *viewer)const
    {

        //vao containing the data for the lines
        {
            program = getShaderProgram(PROGRAM_WITHOUT_LIGHT, viewer);
            program->bind();

            vaos[0]->bind();
            buffers[0].bind();
            buffers[0].allocate(positions_lines.data(),
                                static_cast<GLsizei>(positions_lines.size()*sizeof(float)));
            program->enableAttributeArray("vertex");
            program->setAttributeBuffer("vertex",GL_FLOAT,0,3);
            buffers[0].release();

            vaos[0]->release();
            program->release();

        }
        are_buffers_filled = true;
    }

    void computeElements() const
    {
        QApplication::setOverrideCursor(Qt::WaitCursor);
        positions_lines.clear();
        const Bbox& bb = scene->bbox();
        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmax());

        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmax());

        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmin());
        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmax());

        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmax());
        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmax());
        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmax());
        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmax());

        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmax());
        positions_lines.push_back(bb.xmin()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmax());
        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmax());
        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymin()); positions_lines.push_back(bb.zmax());
        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmax());
        positions_lines.push_back(bb.xmax()); positions_lines.push_back(bb.ymax()); positions_lines.push_back(bb.zmin());
        QApplication::restoreOverrideCursor();
    }

    const CGAL::Three::Scene_interface* scene;
};

#include <CGAL/Three/Polyhedron_demo_plugin_interface.h>

using namespace CGAL::Three;
class Polyhedron_demo_trivial_plugin : 
        public QObject,
        public Polyhedron_demo_plugin_interface
{
    Q_OBJECT
    Q_INTERFACES(CGAL::Three::Polyhedron_demo_plugin_interface)
    Q_PLUGIN_METADATA(IID "com.geometryfactory.PolyhedronDemo.PluginInterface/1.0")

public:
    void init(QMainWindow* mainWindow, CGAL::Three::Scene_interface* scene_interface, Messages_interface*);
    QList<QAction*> actions() const {
        return QList<QAction*>() << actionBbox;
    }

    bool applicable(QAction*) const {
      if(scene->numberOfEntries() > 0)
        return true;
    return false;}
public Q_SLOTS:

    void bbox();
    void enableAction();

private:
    CGAL::Three::Scene_interface* scene;
    QAction* actionBbox;


}; // end Polyhedron_demo_trivial_plugin

void Polyhedron_demo_trivial_plugin::init(QMainWindow* mainWindow, CGAL::Three::Scene_interface* scene_interface, Messages_interface*)
{
    scene = scene_interface;
    actionBbox = new QAction(tr("Create Bbox"), mainWindow);
    connect(actionBbox, SIGNAL(triggered()),
            this, SLOT(bbox()));
}

void Polyhedron_demo_trivial_plugin::bbox()
{
    for(int i = 0, end = scene->numberOfEntries();
        i < end; ++i)
    {
        if(qobject_cast<Scene_bbox_item*>(scene->item(i)))
            return;
    }
    QApplication::setOverrideCursor(Qt::WaitCursor);
    Scene_item* item = new Scene_bbox_item(scene);
    connect(item, SIGNAL(destroyed()),
            this, SLOT(enableAction()));
    item->setName("Scene bbox");
    item->setColor(Qt::black);
    item->setRenderingMode(Wireframe);
    scene->addItem(item);
    actionBbox->setEnabled(false);
    QApplication::restoreOverrideCursor();
}

void Polyhedron_demo_trivial_plugin::enableAction() {
    actionBbox->setEnabled(true);
}

#include "Trivial_plugin.moc"