ubuntu下 qt5.5 利用opengl画3d坐标系

#include "openglwidget.h" OpenglWidget::OpenglWidget(QWidget *parent) :QGLWidget(parent) { initWidget(); initializeGL(); } 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); glBlendFunc( GL_SRC_ALPHA, GL_ONE ); glEnable( GL_BLEND ); } 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( 0, 0.0, -6.0 ); glRotatef( 45, 1.0, 1.0, 1.0 ); draw3DCorDSystem(); // drawCubeObj(); } void OpenglWidget::resizeGL(int width, int height) { if(0 == height) { height = 1; } glViewport(0, 0, (GLint)width, (GLint)height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); 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(); } void OpenglWidget::draw3DCorDSystem() { //void glutWireCone(GLdouble radius, GLdouble height, GLint slices, GLint stacks); //radius 圆锥体基底的半径，height 圆锥体的高度，stacks条纬线，slice条经线 //x轴 glBegin(GL_LINES); glColor3f(1.0f,0.0f,0.0f); glVertex3f(0.0f, 0.0f, 0.0f); glVertex3f(1.0, 0.0f, 0.0f); glEnd(); glPushMatrix(); glTranslatef(1.0, 0.0f, 0.0f); glRotatef(90.0f,0.0f,1.0f,0.0f); glutWireCone(0.027,0.09,10,10); glPopMatrix(); //y轴 glBegin(GL_LINES); glColor3f(0.0f,1.0f,0.0f); glVertex3f(0.0f, 0.0f, 0.0f); glVertex3f(0.0, 1.0f, 0.0f); glEnd(); glPushMatrix(); glTranslatef(0.0, 1.0f, 0.0f); glRotatef(270.0f,1.0f,0.0f,0.0f); glutWireCone(0.027,0.09,10,10); glPopMatrix(); //z轴 glBegin(GL_LINES); glColor3f(0.0f,0.0f,1.0f); glVertex3f(0.0f, 0.0f, 0.0f); glVertex3f(0.0, 0.0f, 1.0f); glEnd(); glPushMatrix(); glTranslatef(0.0, 0.0f, 1.0f); glRotatef(90.0f,0.0f,0.0f,1.0f); glutWireCone(0.027,0.09,10,10); glPopMatrix(); } void OpenglWidget::drawCubeObj() { glBegin( GL_QUADS ); glColor4f(1, 0, 0,0.4); glVertex3f(-1,1,1); glVertex3f(-1,1,-1); glVertex3f(-1,-1,-1); glVertex3f(-1,-1,1); glColor4f(0, 0, 1,1); glVertex3f(-1,1,-1); glVertex3f(-1,-1,-1); glVertex3f(1,-1,-1); glVertex3f(1,1,-1); glColor4f(0, 1, 0,0.6); glVertex3f(1,1,-1); glVertex3f(1,-1,-1); glVertex3f(1,-1,1); glVertex3f(1,1,1); glColor4f(0, 0, 1,0.3); glVertex3f(1,-1,1); glVertex3f(1,1,1); glVertex3f(-1,1,1); glVertex3f(-1,-1,1); glColor4f(0, 1, 0,0.2); glVertex3f(-1,1,1); glVertex3f(1,1,1); glVertex3f(1,1,-1); glVertex3f(-1,1,-1); glColor4f(0, 0, 1,0.8); glVertex3f(-1,-1,1); glVertex3f(-1,-1,-1); glVertex3f(1,-1,-1); glVertex3f(1,-1,1); glEnd(); } void OpenglWidget::drawTriangularObj() { glBegin( GL_TRIANGLES ); 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, -1.0 ); glColor3f( 0.0, 1.0, 0.0 ); glVertex3f( -1.0, -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, 1.0 ); glColor3f( 0.0, 1.0, 0.0 ); glVertex3f( 1.0, -1.0, -1.0 ); 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, 1.0 ); glColor3f( 0.0, 0.0, 1.0 ); glVertex3f( 1.0, -1.0, 1.0 ); 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, -1.0 ); glColor3f( 0.0, 0.0, 1.0 ); glVertex3f( -1.0, -1.0, -1.0 ); glEnd(); }