ew QLabel();
mLabel->setText(Bitch);
computePiThread = new ComputeThread;
mainLayout->setSpacing(10);
mainLayout->addWidget(calButton);
mainLayout->addWidget(hiButton);
mainLayout->addWidget(mLabel);
QWidget *centreWidget=new QWidget(this);
centreWidget->setLayout(mainLayout);
this->setCentralWidget(centreWidget);
this->connect(computePiThread,SIGNAL(computeFinish(double)),this, SLOT(slotShowResult(double)));
this->connect(hiButton,SIGNAL(released()),this, SLOT(slotSayHi()));
this->connect(calButton,SIGNAL(released()),this, SLOT(slotGetPi()));
}
MainWindow::~MainWindow()
{
computePiThread->terminate();
computePiThread->wait();
delete computePiThread;
computePiThread = 0;
}
void MainWindow::slotGetPi()
{
computePiThread->start();
}
void MainWindow::slotSayHi()
{
mLabel->setText(Hei,gay~);
}
void MainWindow::slotShowResult(double result)
{
mLabel->setText(QString::number(result));
}
运行结果
修改之后计算就在子线程中进行，主线程就没有卡死的情况了。
MultiThread in Opengl
之前有用QT作为框架来学习OpenGL，参考这里。
当是有个问题没有解决，就是当想要GLWidget中的图形不断的进行变换的话，就要在主线程中加一个死循环，这样做只是权宜之记，最好的解决方法就是用多线程。
创建一个GLThread类专门用来渲染：
glthread.h
#ifndef GLTHREAD_H
#define GLTHREAD_H
#include
#include
#include
#include
class GLWidget; class GLThread : public QThread { public: GLThread(GLWidget *glWidget); void resizeViewport(const QSize &size); void run(); void stop(); private: bool doRendering; bool doResize; int w; int h; GLWidget *glw; }; #endif // GLTHREAD_H
glthread.cpp
#include glthread.h
#include glwidget.h
GLThread::GLThread(GLWidget *gl)
: QThread(), glw(gl)
{
doRendering = true;
doResize = false;
}
void GLThread::stop()
{
doRendering = false;
}
void GLThread::resizeViewport(const QSize &size)
{
w = size.width();
h = size.height();
doResize = true;
}
void GLThread::run()
{
glw->makeCurrent();
this->rotAngle = 0.0;
glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // This Will Clear The Background Color To Black
glClearDepth(1.0); // Enables Clearing Of The Depth Buffer
glDepthFunc(GL_LESS); // The Type Of Depth Test To Do
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glShadeModel(GL_SMOOTH); // Enables Smooth Color Shading
glMatrixMode(GL_PROJECTION);
glLoadIdentity(); // Reset The Projection Matrix
gluPerspective(45.0f,(GLfloat)w/(GLfloat)h,0.1f,100.0f); // Calculate The Aspect Ratio Of The Window
glMatrixMode(GL_MODELVIEW);
while (doRendering)
{
rotAngle +=5;
if(rotAngle>=360)
rotAngle = 0;
if (doResize)
{
glViewport(0, 0, w, h);
doResize = false;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f,(GLfloat)w/(GLfloat)h,0.1f,100.0f);
glMatrixMode(GL_MODELVIEW);
}
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
glLoadIdentity(); // Reset The View
glTranslatef(-1.5f,0.0f,-6.0f); // Move Left 1.5 Units And Into The Screen 6.0
glRotatef(rotAngle,0.0f,0.0f,1.0f); // Rotate The Triangle On The Y axis
// draw a triangle (in smooth coloring mode)
glBegin(GL_POLYGON); // start drawing a polygon
glColor3f(1.0f,0.0f,0.0f); // Set The Color To Red
glVertex3f( 0.0f, 1.0f, 0.0f); // Top
glColor3f(0.0f,1.0f,0.0f); // Set The Color To Green
glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom R