Qt5使用openGL，进行3d绘图

https://blog.csdn.net/qq_35703848/article/details/79819854　

　1、

 1 #ifndef WIDGET_H
 2 #define WIDGET_H
 3 
 4 #include <QWidget>
 5 #include <QOpenGLWindow>
 6 #include <QOpenGLFunctions>
 7 
 8 class Widget : public QOpenGLWindow,protected QOpenGLFunctions
 9 {
10     Q_OBJECT
11 
12 public:
13   //  Widget(QWidget *parent = 0);
14   //使用时，直接Widget w;即可。
15     ~Widget(){};
16 
17     void initializeGL()
18     {
19         initializeOpenGLFunctions();
20         glClearColor(0.0f,0.0f,0.0f,0.0f);
21     }
22     void resizeGL(int width, int height){} //若无需对高、宽进行处理，此函数可省
23     void paintGL()
24     {
25         glClear(GL_COLOR_BUFFER_BIT);
26     }
27 };
28 
29 #endif // WIDGET_H

2、使用QGLWidget

 1 #ifndef OPENGLWIDGET_H
 2 #define OPENGLWIDGET_H
 3 #include <QtOpenGL>
 4 
 5 class OpenglWidget : public QGLWidget
 6 {
 7 public:
 8     OpenglWidget(QWidget *parent=0);
 9 protected:
10     void initializeGL();
11     void initWidget();
12     void paintGL();
13     void resizeGL(int width, int height);
14 private:
15     GLfloat angle;
16     GLfloat angle1;
17 };
18 #endif // OPENGLWIDGET_H

  1 #include "widget.h"
  2 
  3 OpenglWidget::OpenglWidget(QWidget *parent):QGLWidget(parent)
  4 {
  5     initWidget();
  6     initializeGL();
  7 }
  8 void OpenglWidget::initializeGL()
  9 {
 10     //设置着色模式，平滑的
 11     glShadeModel(GL_SMOOTH);
 12     //清除掉之前的所有颜色
 13     glClearColor(0.0,0.0,0.0,0.0);
 14     //深度缓存,设置初始值为1.0，小于1.0的部分是可见的
 15     glClearDepth(1.0);
 16     //启动OPenGL的相关功能，由参数决定，这里指
 17     //（启用了之后，OpenGL在绘制的时候就会检查，当前像素前面是否有别的像素，如果别的像素挡道了它，那它就不会绘制，也就是说，OpenGL就只绘制最前面的一层）
 18     glEnable(GL_DEPTH_TEST);
 19     //制定深度缓存比较值
 20     //这里参数指的是如果输入的深度值小于或者等于参考值则通过
 21     glDepthFunc(GL_LEQUAL);
 22 
 23     glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
 24 
 25 }
 26 
 27 void OpenglWidget::initWidget()
 28 {
 29     //从屏幕上（400，400）为起始点，显示一个640*400的界面
 30     setGeometry(400,200,640,480);
 31     setWindowTitle("My OPenGL");
 32 }
 33 
 34 void OpenglWidget::paintGL()
 35 {
 36     //清除颜色缓冲和深度缓冲
 37     glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
 38     //将当前点移置屏幕中心，相当于复位的操作
 39     glLoadIdentity();
 40     //平移函数,参数指的是分别从X轴，Y轴，Z轴平移
 41     glTranslatef(-1.5,0.0,-6.0);
 42 
 43 
 44     glRotated(angle,0.0,1.0,0.0);
 45     //创建图元，是绘制什么图形的接口，参数是绘制多边形的意思
 46     glBegin(GL_QUADS);
 47     //设置顶点值（f代表浮点），三维空间坐标
 48     glColor3f( 1.0, 0.0, 0.0 );
 49     glBegin( GL_QUADS );
 50 
 51        glColor3f(1, 0, 0);
 52        glVertex3f(-1,1,1);
 53        glVertex3f(-1,1,-1);
 54        glVertex3f(-1,-1,-1);
 55        glVertex3f(-1,-1,1);
 56 
 57        glColor3f(0, 0, 1);
 58        glVertex3f(-1,1,-1);
 59        glVertex3f(-1,-1,-1);
 60        glVertex3f(1,-1,-1);
 61        glVertex3f(1,1,-1);
 62 
 63        glColor3f(0, 1, 0);
 64        glVertex3f(1,1,-1);
 65        glVertex3f(1,-1,-1);
 66        glVertex3f(1,-1,1);
 67        glVertex3f(1,1,1);
 68 
 69        glColor3f(0, 0, 1);
 70        glVertex3f(1,-1,1);
 71        glVertex3f(1,1,1);
 72        glVertex3f(-1,1,1);
 73        glVertex3f(-1,-1,1);
 74 
 75        glColor3f(0, 1, 0);
 76        glVertex3f(-1,1,1);
 77        glVertex3f(1,1,1);
 78        glVertex3f(1,1,-1);
 79        glVertex3f(-1,1,-1);
 80 
 81        glColor3f(0, 0, 1);
 82        glVertex3f(-1,-1,1);
 83        glVertex3f(-1,-1,-1);
 84        glVertex3f(1,-1,-1);
 85        glVertex3f(1,-1,1);
 86        glEnd();
 87 
 88        glLoadIdentity();
 89 
 90       glTranslatef(1.5,0.0,-6.0);
 91       glRotatef( angle1,0.0,1.0,0.0);
 92 
 93       glBegin( GL_TRIANGLES );
 94 
 95       glColor3f( 1.0, 0.0, 0.0 );
 96       glVertex3f(  0.0,  1.0,  0.0 );
 97       glColor3f( 0.0, 0.0, 1.0 );
 98       glVertex3f( -1.0, -1.0, -1.0 );
 99       glColor3f( 0.0, 1.0, 0.0 );
100       glVertex3f( -1.0, -1.0,  1.0 );
101 
102       glColor3f( 1.0, 0.0, 0.0 );
103       glVertex3f(  0.0,  1.0,  0.0 );
104       glColor3f( 0.0, 0.0, 1.0 );
105       glVertex3f(  1.0, -1.0,  1.0 );
106       glColor3f( 0.0, 1.0, 0.0 );
107       glVertex3f(  1.0, -1.0, -1.0 );
108 
109       glColor3f( 1.0, 0.0, 0.0 );
110       glVertex3f(  0.0,  1.0,  0.0 );
111       glColor3f( 0.0, 1.0, 0.0 );
112       glVertex3f( -1.0, -1.0,  1.0 );
113       glColor3f( 0.0, 0.0, 1.0 );
114       glVertex3f(  1.0, -1.0,  1.0 );
115 
116 
117       glColor3f( 1.0, 0.0, 0.0 );
118       glVertex3f(  0.0,  1.0,  0.0 );
119       glColor3f( 0.0, 1.0, 0.0 );
120       glVertex3f(  1.0, -1.0, -1.0 );
121       glColor3f( 0.0, 0.0, 1.0 );
122       glVertex3f( -1.0, -1.0, -1.0 );
123 
124       glEnd();
125 
126     angle+=70;
127     angle1+=10;
128 
129 }
130 
131 void OpenglWidget::resizeGL(int width, int height)
132 {
133     if(0==height)
134         height=1;
135     //告诉绘制到窗体的哪个位置
136     glViewport(0,0,width,height);
137     // 设置矩阵模式，参数是设置为投影矩阵
138     glMatrixMode(GL_PROJECTION);
139     //复位操作
140     glLoadIdentity();
141 
142     GLdouble aspectRatio=(GLfloat)width/(GLfloat)height;
143     GLdouble rFov=45.0*3.14159265/180.0;
144     GLdouble zNear=0.1;
145     GLdouble zFar=100.0;
146     //调用glFrustum，生成矩阵与当前矩阵相乘，生成透视效果
147     glFrustum(-zNear*tan(rFov/2.0)*aspectRatio,
148               zNear*tan(rFov/2.0)*aspectRatio,
149               -zNear*tan(rFov/2.0),
150               zNear*tan(rFov/2.0),
151               zNear,zFar);
152     //切回模型视图矩阵
153     glMatrixMode(GL_MODELVIEW);
154     //复位
155     glLoadIdentity();
156 }

Qt5使用openGL，进行3d绘图

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