Qt下使用OpenGL（2）-根据NeHe的教程改写的

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第二课：多边形

这里只有paintGL()函数改了，故只给出nehewidget.cpp文件，其它的和第一课的一样。

#include "nehewidget.h"#include <gl/GLU.h>#include <QKeyEvent>nehewidget::nehewidget(QWidget *parent,bool fs): QGLWidget(parent){fullscreen=fs;setGeometry(50,50,640,480);//setCaption("OpenGL window"); //这个函数，不支持了吧？setWindowTitle("OpenGL Window");if(fullscreen) showFullScreen();}nehewidget::~nehewidget(){}void nehewidget::initializeGL(){glShadeModel(GL_SMOOTH);glClearColor(0,0,0,0);glClearDepth(1.0);glEnable(GL_DEPTH_TEST);glDepthFunc(GL_LEQUAL);glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);}void nehewidget::paintGL(){glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);glLoadIdentity();//难道是gluPerspective的缘故？参数必须小一些才能看到图形//而且圆形和屏幕大小有关系，屏幕不对劲，正方形变长方形了……glTranslatef(-0.3,0.3,-0.6);glBegin(GL_TRIANGLES);glVertex3f(0.0,0.2,0.0);glVertex3f(-0.2,-0.2,0.0);glVertex3f(0.2,-0.2,0.0);glEnd();glTranslatef(0.6,0,0);glBegin(GL_QUADS);glVertex3f(-0.2,0.2,0);glVertex3f(0.2,0.2,0);glVertex3f(0.2,-0.2,0);glVertex3f(-0.2,-0.2,0);glEnd();//下面被注释的一段是另添加的，有兴趣的可以去掉注释运行一下//用连续的点或三角形来逼近圆，一个空心，一个实心/*glTranslatef(-0.5,-0.5,0.0);GLfloat x,y,angle;glBegin(GL_POINTS);for(angle=0;angle<2*3.1415926;angle+=0.001) {x=0.2*sin(angle);y=0.2*cos(angle);glVertex3f(x,y,0.0);}glEnd();glTranslatef(0.5,0.0,0.0);glBegin(GL_TRIANGLE_FAN);for(int i=0;i<100;i++) {float angle=2*3.1415926*i/100;glVertex3f(0.2*cos(angle),0.2*sin(angle),0);}glEnd();*/}void nehewidget::resizeGL(int w,int h){if(h==0) h=1;glViewport(0,0,(GLint)w,(GLint)h);glMatrixMode(GL_PROJECTION);glLoadIdentity();//下面这个函数在Qt和OpenGL新版本中都不支持了！先注释掉吧，以后不得不用时再想办法//gluPerspective(45.0,(GLfloat)w/(GLfloat)h,0.1,100.0);glMatrixMode(GL_MODELVIEW);glLoadIdentity();}void nehewidget::keyPressEvent(QKeyEvent *e){switch(e->key()) {case Qt::Key_F2:fullscreen=!fullscreen;if(fullscreen) showFullScreen();else {showNormal();setGeometry(0,0,640,480);}updateGL();break;case Qt::Key_Escape:close();}}

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