tetrahedron.cpp:124: error: 'gluPickMatrix' was not declared in this scope

[8Observer8]

Hello

I read the book: "C++ GUI Programming with Qt4 (2nd Edition - Feb 2008)"

I have this error message: "tetrahedron.cpp:124: error: 'gluPickMatrix' was not declared in this scope"

Chapter 8

tetrahedron.pro

TEMPLATE      = app
QT           += opengl
CONFIG       += console
HEADERS       = tetrahedron.h
SOURCES       = main.cpp \
                tetrahedron.cpp

TEMPLATE      = app
QT           += opengl
CONFIG       += console
HEADERS       = tetrahedron.h
SOURCES       = main.cpp \
                tetrahedron.cpp

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main.cpp

#include <QApplication>
#include <iostream>
 
#include "tetrahedron.h"
 
using namespace std;
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    if (!QGLFormat::hasOpenGL()) {
        cerr << "This system has no OpenGL support" << endl;
        return 1;
    }
 
    Tetrahedron tetrahedron;
    tetrahedron.setWindowTitle(QObject::tr("Tetrahedron"));
    tetrahedron.resize(300, 300);
    tetrahedron.show();
 
    return app.exec();
}

#include <QApplication>
#include <iostream>

#include "tetrahedron.h"

using namespace std;

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    if (!QGLFormat::hasOpenGL()) {
        cerr << "This system has no OpenGL support" << endl;
        return 1;
    }

    Tetrahedron tetrahedron;
    tetrahedron.setWindowTitle(QObject::tr("Tetrahedron"));
    tetrahedron.resize(300, 300);
    tetrahedron.show();

    return app.exec();
}

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tetrahedron.h

#ifndef TETRAHEDRON_H
#define TETRAHEDRON_H
 
#include <QGLWidget>
 
class Tetrahedron : public QGLWidget
{
    Q_OBJECT
 
public:
    Tetrahedron(QWidget *parent = 0);
 
protected:
    void initializeGL();
    void resizeGL(int width, int height);
    void paintGL();
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseDoubleClickEvent(QMouseEvent *event);
 
private:
    void draw();
    int faceAtPosition(const QPoint &pos);
 
    GLfloat rotationX;
    GLfloat rotationY;
    GLfloat rotationZ;
    QColor faceColors[4];
    QPoint lastPos;
};
 
#endif

#ifndef TETRAHEDRON_H
#define TETRAHEDRON_H

#include <QGLWidget>

class Tetrahedron : public QGLWidget
{
    Q_OBJECT

public:
    Tetrahedron(QWidget *parent = 0);

protected:
    void initializeGL();
    void resizeGL(int width, int height);
    void paintGL();
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseDoubleClickEvent(QMouseEvent *event);

private:
    void draw();
    int faceAtPosition(const QPoint &pos);

    GLfloat rotationX;
    GLfloat rotationY;
    GLfloat rotationZ;
    QColor faceColors[4];
    QPoint lastPos;
};

#endif

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tetrahedron.cpp

#include <QtGui>
#include <QtOpenGL>
 
#include "tetrahedron.h"
 
Tetrahedron::Tetrahedron(QWidget *parent)
    : QGLWidget(parent)
{
    setFormat(QGLFormat(QGL::DoubleBuffer | QGL::DepthBuffer));
    rotationX = -21.0;
    rotationY = -57.0;
    rotationZ = 0.0;
    faceColors[0] = Qt::red;
    faceColors[1] = Qt::green;
    faceColors[2] = Qt::blue;
    faceColors[3] = Qt::yellow;
}
 
void Tetrahedron::initializeGL()
{
    qglClearColor(Qt::black);
    glShadeModel(GL_FLAT);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);
}
 
void Tetrahedron::resizeGL(int width, int height)
{
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    GLfloat x = GLfloat(width) / height;
    glFrustum(-x, x, -1.0, 1.0, 4.0, 15.0);
    glMatrixMode(GL_MODELVIEW);
}
 
void Tetrahedron::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    draw();
}
 
void Tetrahedron::mousePressEvent(QMouseEvent *event)
{
    lastPos = event->pos();
}
 
void Tetrahedron::mouseMoveEvent(QMouseEvent *event)
{
    GLfloat dx = GLfloat(event->x() - lastPos.x()) / width();
    GLfloat dy = GLfloat(event->y() - lastPos.y()) / height();
 
    if (event->buttons() & Qt::LeftButton) {
        rotationX += 180 * dy;
        rotationY += 180 * dx;
        updateGL();
    } else if (event->buttons() & Qt::RightButton) {
        rotationX += 180 * dy;
        rotationZ += 180 * dx;
        updateGL();
    }
    lastPos = event->pos();
}
 
void Tetrahedron::mouseDoubleClickEvent(QMouseEvent *event)
{
    int face = faceAtPosition(event->pos());
    if (face != -1) {
        QColor color = QColorDialog::getColor(faceColors[face], this);
        if (color.isValid()) {
            faceColors[face] = color;
            updateGL();
        }
    }
}
 
void Tetrahedron::draw()
{
    static const GLfloat P1[3] = { 0.0, -1.0, +2.0 };
    static const GLfloat P2[3] = { +1.73205081, -1.0, -1.0 };
    static const GLfloat P3[3] = { -1.73205081, -1.0, -1.0 };
    static const GLfloat P4[3] = { 0.0, +2.0, 0.0 };
 
    static const GLfloat * const coords[4][3] = {
        { P1, P2, P3 }, { P1, P3, P4 }, { P1, P4, P2 }, { P2, P4, P3 }
    };
 
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0.0, 0.0, -10.0);
    glRotatef(rotationX, 1.0, 0.0, 0.0);
    glRotatef(rotationY, 0.0, 1.0, 0.0);
    glRotatef(rotationZ, 0.0, 0.0, 1.0);
 
    for (int i = 0; i < 4; ++i) {
        glLoadName(i);
        glBegin(GL_TRIANGLES);
        qglColor(faceColors[i]);
        for (int j = 0; j < 3; ++j) {
            glVertex3f(coords[i][j][0], coords[i][j][1],
                       coords[i][j][2]);
        }
        glEnd();
    }
}
 
int Tetrahedron::faceAtPosition(const QPoint &pos)
{
    const int MaxSize = 512;
    GLuint buffer[MaxSize];
    GLint viewport[4];
 
    glGetIntegerv(GL_VIEWPORT, viewport);
    glSelectBuffer(MaxSize, buffer);
    glRenderMode(GL_SELECT);
 
    glInitNames();
    glPushName(0);
 
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    gluPickMatrix(GLdouble(pos.x()), GLdouble(viewport[3] - pos.y()),
                  5.0, 5.0, viewport);
    GLfloat x = GLfloat(width()) / height();
    glFrustum(-x, x, -1.0, 1.0, 4.0, 15.0);
    draw();
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();
 
    if (!glRenderMode(GL_RENDER))
        return -1;
    return buffer[3];
}

#include <QtGui>
#include <QtOpenGL>

#include "tetrahedron.h"

Tetrahedron::Tetrahedron(QWidget *parent)
    : QGLWidget(parent)
{
    setFormat(QGLFormat(QGL::DoubleBuffer | QGL::DepthBuffer));
    rotationX = -21.0;
    rotationY = -57.0;
    rotationZ = 0.0;
    faceColors[0] = Qt::red;
    faceColors[1] = Qt::green;
    faceColors[2] = Qt::blue;
    faceColors[3] = Qt::yellow;
}

void Tetrahedron::initializeGL()
{
    qglClearColor(Qt::black);
    glShadeModel(GL_FLAT);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);
}

void Tetrahedron::resizeGL(int width, int height)
{
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    GLfloat x = GLfloat(width) / height;
    glFrustum(-x, x, -1.0, 1.0, 4.0, 15.0);
    glMatrixMode(GL_MODELVIEW);
}

void Tetrahedron::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    draw();
}

void Tetrahedron::mousePressEvent(QMouseEvent *event)
{
    lastPos = event->pos();
}

void Tetrahedron::mouseMoveEvent(QMouseEvent *event)
{
    GLfloat dx = GLfloat(event->x() - lastPos.x()) / width();
    GLfloat dy = GLfloat(event->y() - lastPos.y()) / height();

    if (event->buttons() & Qt::LeftButton) {
        rotationX += 180 * dy;
        rotationY += 180 * dx;
        updateGL();
    } else if (event->buttons() & Qt::RightButton) {
        rotationX += 180 * dy;
        rotationZ += 180 * dx;
        updateGL();
    }
    lastPos = event->pos();
}

void Tetrahedron::mouseDoubleClickEvent(QMouseEvent *event)
{
    int face = faceAtPosition(event->pos());
    if (face != -1) {
        QColor color = QColorDialog::getColor(faceColors[face], this);
        if (color.isValid()) {
            faceColors[face] = color;
            updateGL();
        }
    }
}

void Tetrahedron::draw()
{
    static const GLfloat P1[3] = { 0.0, -1.0, +2.0 };
    static const GLfloat P2[3] = { +1.73205081, -1.0, -1.0 };
    static const GLfloat P3[3] = { -1.73205081, -1.0, -1.0 };
    static const GLfloat P4[3] = { 0.0, +2.0, 0.0 };

    static const GLfloat * const coords[4][3] = {
        { P1, P2, P3 }, { P1, P3, P4 }, { P1, P4, P2 }, { P2, P4, P3 }
    };

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0.0, 0.0, -10.0);
    glRotatef(rotationX, 1.0, 0.0, 0.0);
    glRotatef(rotationY, 0.0, 1.0, 0.0);
    glRotatef(rotationZ, 0.0, 0.0, 1.0);

    for (int i = 0; i < 4; ++i) {
        glLoadName(i);
        glBegin(GL_TRIANGLES);
        qglColor(faceColors[i]);
        for (int j = 0; j < 3; ++j) {
            glVertex3f(coords[i][j][0], coords[i][j][1],
                       coords[i][j][2]);
        }
        glEnd();
    }
}

int Tetrahedron::faceAtPosition(const QPoint &pos)
{
    const int MaxSize = 512;
    GLuint buffer[MaxSize];
    GLint viewport[4];

    glGetIntegerv(GL_VIEWPORT, viewport);
    glSelectBuffer(MaxSize, buffer);
    glRenderMode(GL_SELECT);

    glInitNames();
    glPushName(0);

    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    gluPickMatrix(GLdouble(pos.x()), GLdouble(viewport[3] - pos.y()),
                  5.0, 5.0, viewport);
    GLfloat x = GLfloat(width()) / height();
    glFrustum(-x, x, -1.0, 1.0, 4.0, 15.0);
    draw();
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();

    if (!glRenderMode(GL_RENDER))
        return -1;
    return buffer[3];
}

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Thanks

Ivan

[d_stranz]

I have this error message: "tetrahedron.cpp:124: error: 'gluPickMatrix' was not declared in this scope"

Well, that error sort of implies that you haven't included the header file that contains the definition of "gluPickMatrix" doesn't it? Try looking for "glu.h" in your OpenGL installation. (Not QtOpenGL, OpenGL).

[8Observer8]

Have I to do to make it work? Must I install the OpenGL library? GLUT?

[8Observer8]

Yes! I solved this problem!

I included in the file 'tetrahedron.cpp':

#include <GL/glu.h>

#include <GL/glu.h>

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But when I close the application I see the error message.

tetrahedron.pngCrash.png