custom_widget.cpp

#include "custom_widget.h"

#include <QApplication>
#include <QTimer>
#include <QKeyEvent>
#include <math.h>

ALfloat CustomWidget::ListenerPos[] = { 0.0, 0.0, 0.0 };
ALfloat CustomWidget::ListenerVel[] = { 0.0, 0.0, 0.0 };
ALfloat CustomWidget::ListenerOri[] = { 0.0, 0.0, -1.0,  0.0, 1.0, 0.0 };

CustomWidget::CustomWidget( int timerInterval, QWidget *parent ) : QGLWidget( parent )
{
    if( timerInterval == 0 )
        m_timer = 0;
    else
    {
        m_timer = new QTimer( this );
        connect( m_timer, SIGNAL(timeout()), this, SLOT(timeOutSlot()) );
        m_timer->start( timerInterval );
    }
}

// initializes openGL
void CustomWidget::initializeGL()
{
    glShadeModel(GL_SMOOTH);

    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    glClearDepth(1.0f);

    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);

    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
}

// gl resize procedure
void CustomWidget::resizeGL( int width, int height )
{
    height = height?height:1;

    glViewport( 0, 0, (GLint)width, (GLint)height );

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    // gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);
    GLfloat fieldOfView = 45.0f;
    GLfloat zNear = 0.1f;
    GLfloat zFar = 255.0f;
    GLfloat aspect = float(width)/float(height);
    GLfloat fH = tan( float(fieldOfView / 360.0f * 3.14159f) ) * zNear;
    GLfloat fW = fH * aspect;
    glFrustum( -fW, fW, -fH, fH, zNear, zFar );
    // glOrtho(-10.0f, 10.0f, -10.0f, 10.0f, 0.1f, 255.0f);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

void CustomWidget::initializeAL(int argc, char**argv)
{
    alutInit (&argc, argv);
    alGetError();
}


void CustomWidget::timeOut()
{
    rtri += 0.5f;
    rquad -= 0.25f;

    updateGL();
}

void CustomWidget::timeOutSlot()
{
    timeOut();
}