QT Opengl 图形旋转

#include "openglwidget.h" OpenglWidget::OpenglWidget(QWidget* parent) :QGLWidget(parent), m_rotateTriangle(0), m_rotateRectangle(0) { initializeGL(); initWidget(); } void OpenglWidget::initializeGL() { glShadeModel(GL_SMOOTH); glClearColor(0.0, 0.0, 0.0, 0.0); glClearDepth(1.0); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); } void OpenglWidget::initWidget() { setGeometry( 400, 200, 640, 480 ); setWindowTitle(tr("opengl demo")); } void OpenglWidget::paintGL() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glTranslatef( -1.5, 0.0, -6.0 ); glRotatef( m_rotateRectangle, 0.0, 1.0, 0.0 ); glBegin( GL_QUADS ); glColor3f(1.0, 0.0, 0.0); glVertex3f( -1.0, 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 ); glColor3f(1.0, 1.0, 1.0); glVertex3f( -1.0, -1.0, 0.0 ); glEnd(); glLoadIdentity(); glTranslatef( 1.5, 0.0, -6.0 ); glRotatef( m_rotateTriangle, 1.0, 0.0, 0.0 ); glColor3f((GLfloat)0.3, (GLfloat)0.2, (GLfloat)0.5); glBegin( GL_TRIANGLES ); qDebug() << "this is a paintGL test!"; glVertex3f( 0.0, 1.0, 0.0 ); glVertex3f( -1.0, -1.0, 0.0 ); glVertex3f( 1.0, -1.0, 0.0 ); glEnd(); m_rotateRectangle += 20; m_rotateTriangle += 20; } void OpenglWidget::resizeGL(int width, int height) { if(0 == height) { height = 1; } glViewport(0, 0, (GLint)width, (GLint)height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); // gluPerspective(45.0, (GLfloat)width/(GLfloat)height, 0.1, 100.0); GLdouble aspectRatio = (GLfloat)width/(GLfloat)height; GLdouble zNear = 0.1; GLdouble zFar = 100.0; GLdouble rFov = 45.0 * 3.14159265 / 180.0; glFrustum( -zNear * tan( rFov / 2.0 ) * aspectRatio, zNear * tan( rFov / 2.0 ) * aspectRatio, -zNear * tan( rFov / 2.0 ), zNear * tan( rFov / 2.0 ), zNear, zFar ); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); }