Qt OPengl 雷达余晖效果

#include "glwidget.h" #include "ui_glwidget.h" GLWidget::GLWidget(QWidget *parent) : QOpenGLWidget(parent), ui(new Ui::GLWidget) { ui->setupUi(this); funllscreen = false; setGeometry(2000,50,950,950); // showFullScreen(); //全屏显示 } GLWidget::~GLWidget() { delete ui; } void GLWidget::initializeGL() { glShadeModel(GL_SMOOTH); //设置阴影平滑 glClearColor(0.0,0.0,0.0,0.0); //设置清除屏幕是所用的颜色 //必须有的 glClearDepth(1.0); //设置好缓冲深度 glEnable(GL_DEPTH_TEST); //启用深度测试 glEnable(GL_LINE_SMOOTH); glDepthFunc(GL_LEQUAL); //所用深度测试类型 //真正的精度修正 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); } static GLfloat the_translatef = -1.3; void GLWidget::paintGL() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //清除屏幕和深度缓冲 glLoadIdentity(); //重置当前观察模型矩阵 将当前点移到屏幕中心 //画坐标系 glTranslatef(0.0,0.0,the_translatef); //这个是个要命的东西，在这里，要理解视场的概念 gluPerspective(45.0,(GLfloat)w/(GLfloat)h,0.1,100.0); 这就是标志你的市场是在纵向 0.1-100之间，你眼前就是最近的，最远的就是负值 glBegin(GL_LINES); glColor3f(0.0f,1.0f,0.0f); glVertex2f(-0.5f,0.0f); glVertex2f(0.5f,0.0f); glEnd(); glBegin(GL_LINES); glColor3f(0.0f,1.0f,0.0f); glVertex2f(0.0f,-0.5f); glVertex2f(0.0f,0.5f); glEnd(); DrwaArc(); Drwaradar(); } void GLWidget::resizeGL(int w, int h) { if(h == 0) //防止H为零，不知道为啥要设置 { h =1; } glViewport(0,0,(GLint)w,(GLint)h); //重置当前窗口大小 glMatrixMode(GL_PROJECTION); //选择投影矩阵 glLoadIdentity(); //重置投影举证 gluPerspective(45.0,(GLfloat)w/(GLfloat)h,0.1,100.0); //建立透视矩阵 glMatrixMode(GL_MODELVIEW); //选择模型观察矩阵 glLoadIdentity(); //重置模型观察矩阵 } void GLWidget::DrwaArc() //画圈圈 { GLfloat pi =3.1415926; GLfloat R = 0.01; int n=1000; glColor3f(0.0,1.0,0.0); for(int k =0;k<10;k++) { R = 0.05+0.05*k; glBegin(GL_LINE_LOOP); for(int i =0;i<1000;i++) { glVertex2f(R*cos(2*pi/n*i),R*sin(2*pi/n*i)); } glEnd(); } } static int i =3600; void GLWidget::Drwaradar() { glEnable(GL_BLEND); glRotatef((0.0+0.2*i),0.0f,0.0f,1.0f); GLfloat pi =3.1415926; glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA); glBegin(GL_LINES); GLfloat agent = 1.0; for(float m=0;m<60;m=m+0.1) //雷达余晖算法 { agent = 1.0-(m/60); // if(agent<0.2) // agent =0.2; glColor4f(0.0,agent,0.0,1.0-(m/60)); glVertex3f(0.0f,0.0f,0.0f); glVertex3f(0.5*cos(pi*((0.0+0.2*i)+m)/180.0),0.5*sin(pi*((0.0+0.2*i)+m)/180.0),0.0f); } glEnd(); glDisable(GL_BLEND); if(i>0) { i--; } else { i=3600; } glColor3f(0.0,1.0,0.0); GLfloat R = 0.01; int n=1000; glBegin(GL_POLYGON); for(int i =0;i<n;i++) { glVertex2f(R*cos(2*pi/n*i),R*sin(2*pi/n*i)); } glEnd(); update(); //时时更新 } //放大缩小，现在只是改变视场的大小，还不确定是不是真正的确定 void GLWidget::wheelEvent(QWheelEvent *event) { if(event->angleDelta().ry()<0) { the_translatef = the_translatef - 0.03; } if(event->angleDelta().ry()>0) { the_translatef = the_translatef + 0.03; } }