QT+OPENGL开发实例

【实例简介】

下载qt5.4.0版本之后打开工程文件即可显示

【实例截图】

【核心代码】

#include "widget.h"
#include <gl/GLU.h>
#include <QTimer>
myQtOpenglWindow::myQtOpenglWindow(QWidget* parent, bool fs)
    :QGLWidget(parent)
{
    rTri=0.0;
    rQuad=0.0;

    //保存窗口是否为全屏的状态。
    fullScreen = fs;

    //设置窗口的位置，即左上角为(0,0)点，大小为640*480。
    setGeometry(20,30, 640, 480);

    // 如果fullscreen为真，那么就全屏显示这个窗口。
    if (fullScreen)
    {
        showFullScreen();
    }
    //通过定时来刷新GL图形显示
    QTimer *timer = new QTimer(this);
    QObject::connect(timer, SIGNAL(timeout()), this, SLOT(updateGL()));
    timer->start(2);

}


void myQtOpenglWindow::initializeGL()
{
    glShadeModel(GL_SMOOTH);//阴影平滑
    glClearColor(0.5, 1.0, 1.0f, 0.0);
    glClearDepth(1.0);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);
    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

}

void myQtOpenglWindow::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glTranslatef(-1.5, 0.0, -6.0);//绘制的坐标点
    rTri  =0.2;
    glRotatef(rTri,11.0f,-50.0f,11.0f);

    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(1.0,0.0,1.0);
    glVertex3f(1.0, -1.0, 0.0);

    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(0.0,-1.0,-1.0);

    glColor3f(1.0,0.0,0.0);
    glVertex3f(0.0,1.0,0.0);
    glColor3f(0.0,0.0,1.0);
    glVertex3f(1.0,-1.0,0.0);
    glColor3f(0.0,1.0,0.0);
    glVertex3f(0.0,-1.0,-1.0);

    glColor3f(1.0,0.0,0.0);
    glVertex3f(0.0,-1.0,-1.0);
    glColor3f(0.0,0.0,1.0);
    glVertex3f(-1.0,-1.0,0.0);
    glColor3f(0.0,1.0,0.0);
    glVertex3f(1.0,-1.0,0.0);

    glEnd();

}

void myQtOpenglWindow::resizeGL(int width, int height)
{
    //防止height为0
    if (height == 0)
    {
        height = 1;
    }
    glShadeModel(GL_SMOOTH);
    //重置当前的视口（Viewport）
    glViewport(0, 0, (GLint)width, (GLint)height);
    glClearColor(0.0f, 0.5f, 0.0f, 0.0f);
    //选择投影矩阵。
    glMatrixMode(GL_PROJECTION);

    //重置投影矩阵
    glLoadIdentity();

    //建立透视投影矩阵
    gluPerspective(45.0, (GLfloat)width / (GLfloat)height, 0.1, 100.0);
    //gluPerspective(45.0,(GLfloat)width() / (GLfloat)height(),0.1,100.0);
    // 选择模型观察矩阵
    glMatrixMode(GL_MODELVIEW);

    // 重置模型观察矩阵。
    glLoadIdentity();

}

void myQtOpenglWindow::keyPressEvent(QKeyEvent * e)
{
    switch (e->key())
    {
        //如果按下了F2键，那么屏幕是否全屏的状态就切换一次。然后再根据需要，显示所要的全屏窗口或者普通窗口。
    case Qt::Key_F2:
        fullScreen = !fullScreen;

        if (fullScreen)
        {
            showFullScreen();
        }
        else
        {
            showNormal();
            setGeometry(0, 0, 640, 480);
        }

        updateGL();
        break;

        //如果按下了Escape键，程序退出。
    case Qt::Key_Escape:
        close();
    }
    return;
}