現在窗口中心即為坐標原點，X軸從左到右，Y軸從下到上，Z軸從里到外。

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程序運行截圖如下：

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源碼如下：

myglwidget.h

#ifndef MYGLWIDGET_H #define MYGLWIDGET_H#include <QWidget> #include <QGLWidget>class MyGLWidget : public QGLWidget {Q_OBJECT public:explicit MyGLWidget(QWidget *parent = 0);signals:protected:void initializeGL();void resizeGL(int w, int h);void paintGL();public slots: };#endif // MYGLWIDGET_H

main.cpp

#include "myglwidget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);MyGLWidget w;w.resize(400,300);w.show();return a.exec(); }

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myglwidget.cpp

#include "myglwidget.h" #include <GL/glu.h>MyGLWidget::MyGLWidget(QWidget *parent) : QGLWidget(parent) {}void MyGLWidget::initializeGL() {glClearColor(0.0,0.0,0.0,0.0);glShadeModel(GL_SMOOTH);glClearDepth(1.0);glEnable(GL_DEPTH_TEST); }void MyGLWidget::resizeGL(int w, int h) {glViewport(0,0,(GLint)w,(GLint)h);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(45.0,(GLfloat)w/(GLfloat)h,0.1,100);glMatrixMode(GL_MODELVIEW);glLoadIdentity(); }void MyGLWidget::paintGL() {glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);glLoadIdentity();glTranslatef(-2.0,0.0,-6.0);glBegin(GL_TRIANGLES);glVertex3f(-1.0,1.0,0.0);glVertex3f(0.0,-1.0,0.0);glVertex3f(1.0,1.0,0.0);glEnd();glTranslatef(4.0,0.0,0.0);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(); }

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