helloopengl.zip

#include "glwidget.h" const GLfloat PI = 3.1415926536f; GLWidget::GLWidget(QGLWidget *parent) : QGLWidget (parent) { setMinimumSize(320,240); resize(640,480); setWindowTitle(tr("Hello OpenGL")); short angle = 18; for(short i=0; i<5; i++) { Point[i][0] = cos(angle * PI/180); Point[i][1] = sin(angle * PI/180); Point[i][2] = 0.0; angle += 72; } } GLWidget::~GLWidget() { } void GLWidget::initializeGL() { // 初始化函数 initializeOpenGLFunctions(); glClearColor(0.0,0.0,0.0,1.0); glShadeModel(GL_SMOOTH); glClearDepth(1.0); glEnable(GL_DEPTH); glDepthFunc(GL_LEQUAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST); } void GLWidget::paintGL() { //清除之前图形并将背景设置为 blue glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClearColor(0.0f, 0.0f, 1.0f, 1.0f); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glTranslatef( -1.5, 0.0, -6.0 ); 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(); glTranslatef( 3.0, 0.0, 0.0 ); glBegin( GL_TRIANGLES ); glVertex3f( 0.0, 1.0, 0.0 ); glVertex3f( -1.0, -1.0, 0.0 ); glVertex3f( 1.0, -1.0, 0.0 ); glEnd(); } void GLWidget::resizeGL(int width, int height) { // 窗口大小变化时 调整大小 glViewport(0, 0, width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); GLdouble fovy=45.0; GLdouble glWidth=static_cast<GLdouble>(width); GLdouble glHeight=static_cast<GLdouble>(height); GLdouble aspect=glWidth/glHeight; GLdouble zNear=0.1; GLdouble zFar=100.0; gluPerspective(fovy,aspect,zNear,zFar); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } void GLWidget::mouseDoubleClickEvent( QMouseEvent *event ) { Q_UNUSED(event); if(windowState() & Qt::WindowFullScreen) showNormal(); else showFullScreen(); } void GLWidget::keyPressEvent(QKeyEvent *e) { if (e->key() == Qt::Key_Escape) close(); }