LINUX下QT+OpenGL编程初步

我用的是ubuntu10.10；安装了qtcreator全套4.7.0；然后随便建一个工程，再pro文件中加入：

 

QT      += opengl

在类的头文件中加入：

 

#include <QtOpenGL>

 

如果编译出现，找不到gl.h文件的错误，则是缺少了一些库；需要安装，执行下面的命令：

sudo apt-get install mesa-common-dev

sudo apt-get install freeglut3

sudo apt-get install freeglut3-dev

sudo apt-get install glutg3

sudo apt-get install glutg3-dev

sudo apt-get install libglut3

sudo apt-get install libglut3-dev

然后，写第一个基于QT的opengl程序：

 

#ifndef NEHEWIDGET_H
#define NEHEWIDGET_H

#include <QtOpenGL>

class NeHeWidget : public QGLWidget
{
        Q_OBJECT

public:
        NeHeWidget( QWidget* parent = 0 );
        ~NeHeWidget();

protected:
        void initializeGL();
        void paintGL();
        void resizeGL( int width, int height );

        void keyPressEvent( QKeyEvent *e );

private:
        int base;
};

#endif//NEHEWIDGET_H

 

 

#include "nehewidget.h"

NeHeWidget::NeHeWidget( QWidget* parent )
    : QGLWidget( parent )
{
    setGeometry( 150, 100, 1024, 576 );
}

NeHeWidget::~NeHeWidget()
{
}

void NeHeWidget::initializeGL()
{
    glShadeModel( GL_SMOOTH ); // Enables Smooth Shading
    glClearColor( 0.0, 0.0, 0.0, 0.0 ); // Black Background
    glClearDepth( 1.0 ); // Depth Buffer Setup
    glEnable( GL_DEPTH_TEST ); // Enables Depth Testing
    glDepthFunc( GL_LEQUAL ); // The Type Of Depth Test To Do
    glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ); // Really Nice Perspective Calculations
}

void NeHeWidget::paintGL()
{
    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
    glLoadIdentity();
    glTranslatef( -1.5,  0.0, -6.0 );
    glBegin( GL_TRIANGLES );
    glColor3f( 1.0, 0.0, 0.0 );
    glVertex3f(  0.0,  1.0,  0.0 );
    glColor3f( 0.0, 1.0, 0.0 );
    glVertex3f( -1.0, -1.0,  0.0 );
    glColor3f( 0.0, 0.0, 1.0 );
    glVertex3f(  1.0, -1.0,  0.0 );
    glEnd();

    glTranslatef(  3.0,  0.0,  0.0 );
    glColor3f( 0.5, 0.5, 1.0 );
    glBegin( GL_QUADS );
    glVertex3f( -1.0,  1.0,  0.0 );
    glVertex3f(  1.0,  1.0,  0.0 );
    glVertex3f(  1.0, -1.0,  0.0 );
    glVertex3f( -1.0, -1.0,  0.0 );
    glEnd();
}

void NeHeWidget::resizeGL( int width, int height )
{
    if ( height == 0 )
    {
        height = 1;
    }

    glViewport( 0, 0, width, height ); // (GLint)
    glMatrixMode( GL_PROJECTION );
    glLoadIdentity();
    gluPerspective( 45.0, (float)width/(float)height, 0.1, 100.0 ); // GLfloat
    glMatrixMode( GL_MODELVIEW );
    glLoadIdentity();
}

void NeHeWidget::keyPressEvent( QKeyEvent *e )
{
    switch ( e->key() )
    {
        case Qt::Key_F2: //F2 key, full screen switch
            break;
        case Qt::Key_Escape: // Esc key, close window
            {
                close();
                break;
            }
        default:
            break;
    }
}

 这个主要是记录一下，没什么可用价值