selection.cpp

This is an example of how to use the CIvfBufferSelection class to select objects in a scene.

// ------------------------------------------------------------
//
// Ivf++ Object selection example
//
// ------------------------------------------------------------
//
// Author: Jonas Lindemann
//

// ------------------------------------------------------------
// Include files
// ------------------------------------------------------------

#include <ivfui/IvfApplication.h>
#include <ivfui/IvfWindow.h>

#include <ivf/IvfCamera.h>
#include <ivf/IvfCube.h>
#include <ivf/IvfSphere.h>
#include <ivf/IvfCylinder.h>
#include <ivf/IvfCone.h>
#include <ivf/IvfAxis.h>
#include <ivf/IvfComposite.h>
#include <ivf/IvfBufferSelection.h>
#include <ivf/IvfLighting.h>
#include <ivf/IvfLight.h>
#include <ivf/IvfMaterial.h>

// ------------------------------------------------------------
// Window class definition
// ------------------------------------------------------------

IvfSmartPointer(CExampleWindow);

class CExampleWindow: public CIvfWindow {
private:

        // Ivf++ objects

        CIvfCameraPtr                           m_camera;
        CIvfCompositePtr                        m_scene;
        CIvfLightPtr                            m_light;

        CIvfBufferSelectionPtr  m_selection;
public:
        CExampleWindow(int X, int Y, int W, int H)
                :CIvfWindow(X, Y, W, H) {};

        virtual void onInit(int width, int height);
        virtual void onResize(int width, int height);
        virtual void onRender();
        virtual void onMouseDown(int x, int y);
};

// ------------------------------------------------------------
// Window class implementation
// ------------------------------------------------------------

void CExampleWindow::onInit(int width, int height)
{
        // Initialize Ivf++ camera

        m_camera = new CIvfCamera();
        m_camera->setPosition(0.0, 4.0, 9.0);

        // Create a materials

        CIvfMaterialPtr redMaterial = new CIvfMaterial();
        redMaterial->setDiffuseColor(1.0f, 0.0f, 0.0f, 1.0f);
        redMaterial->setSpecularColor(1.0f, 1.0f, 1.0f, 1.0f);
        redMaterial->setAmbientColor(0.5f, 0.0f, 0.0f, 1.0f);

        CIvfMaterialPtr greenMaterial = new CIvfMaterial();
        greenMaterial->setDiffuseColor(0.0f, 1.0f, 0.0f, 1.0f);
        greenMaterial->setSpecularColor(1.0f, 1.0f, 1.0f, 1.0f);
        greenMaterial->setAmbientColor(0.0f, 0.5f, 0.0f, 1.0f);
        
        CIvfMaterialPtr blueMaterial = new CIvfMaterial();
        blueMaterial->setDiffuseColor(0.0f, 0.0f, 1.0f, 1.0f);
        blueMaterial->setSpecularColor(1.0f, 1.0f, 1.0f, 1.0f);
        blueMaterial->setAmbientColor(0.0f, 0.0f, 0.5f, 1.0f);

        CIvfMaterialPtr yellowMaterial = new CIvfMaterial();
        yellowMaterial->setDiffuseColor(1.0f, 1.0f, 0.0f, 1.0f);
        yellowMaterial->setSpecularColor(1.0f, 1.0f, 1.0f, 1.0f);
        yellowMaterial->setAmbientColor(0.5f, 0.5f, 0.0f, 1.0f);

        // Create scene composite

        m_scene = new CIvfComposite();

        // Create objects
        
        CIvfCubePtr cube = new CIvfCube();
        cube->setMaterial(redMaterial);
        cube->setPosition(2.0, 0.0, 2.0);
        m_scene->addChild(cube);

        CIvfSpherePtr sphere = new CIvfSphere();
        sphere->setMaterial(greenMaterial);
        sphere->setPosition(-2.0, 0.0, 2.0);
        m_scene->addChild(sphere);

        CIvfCylinderPtr cylinder = new CIvfCylinder();
        cylinder->setMaterial(blueMaterial);
        cylinder->setPosition(-2.0, 0.0, -2.0);
        m_scene->addChild(cylinder);

        CIvfConePtr cone = new CIvfCone();
        cone->setMaterial(yellowMaterial);
        cone->setPosition(2.0, 0.0, -2.0);
        cone->setRotationQuat(0.0, 0.0, 1.0, 45.0);
        m_scene->addChild(cone);

        CIvfAxisPtr axis = new CIvfAxis();
        m_scene->addChild(axis);

        // Setup the selection algorithm,

        m_selection = new CIvfBufferSelection();
        m_selection->setView(m_camera);
        m_selection->setComposite(m_scene);
        
        // Create a light

        CIvfLightingPtr lighting = CIvfLighting::getInstance();

        m_light = lighting->getLight(0);
        m_light->setType(CIvfLight::LT_DIRECTIONAL);
        m_light->setDirection(1.0, 1.0, 1.0);
        m_light->setAmbientColor(0.2f, 0.2f, 0.2f, 1.0f); 
        m_light->enable();
}

// ------------------------------------------------------------
void CExampleWindow::onResize(int width, int height)
{
        m_camera->setPerspective(45.0, 0.1, 100.0);
        m_camera->setViewPort(width, height);
        m_camera->initialize();
}

// ------------------------------------------------------------
void CExampleWindow::onRender()
{
        m_camera->render();
        m_light->render();
        m_scene->render();
}

// ------------------------------------------------------------
void CExampleWindow::onMouseDown(int x, int y)
{
        int i;

        if (isLeftButtonDown())
        {
                m_selection->pick(x, y);
                if (m_selection->getSelectedShape()!=NULL)
                {
                        m_selection->getSelectedShape()->setHighlight(CIvfShape::HS_ON);
                        redraw();
                }
                else
                {
                        m_scene->setHighlightChildren(CIvfShape::HS_OFF);
                        redraw();
                }
        }
        
        if (isRightButtonDown())
        {
                m_selection->pick(x, y);
                if (m_selection->getSize()!=0)
                {
                        for (i=0; i<m_selection->getSize(); i++)
                                m_selection->getSelectedShape(i)->setHighlight(CIvfShape::HS_ON);

                        redraw();
                }
                else
                {
                        m_scene->setHighlightChildren(CIvfShape::HS_OFF);
                        redraw();
                }
        }
}

// ------------------------------------------------------------
// Main program
// ------------------------------------------------------------

int main(int argc, char **argv) 
{
        // Create Ivf++ application object.

        CIvfApplicationPtr app = new CIvfApplication(IVF_DOUBLE|IVF_RGB);

        // Create a window

        CExampleWindowPtr window = new CExampleWindow(0, 0, 512, 512);

        // Set window title and show window

        window->setWindowTitle("Ivf++ Selection example");
        window->show();

        // Enter main application loop

    app->run();

        return 0;
}

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