áãÇÐÇ openGL ãÚ Qt
Çä ãÇÊæÝÑå Qt áß ãä ÅãßÇäíÇÊ Ýí ÇáÊÚÇãá ãÚ openGL íÌÚáåÇ ÎíÇÑß ÇáÃæá Ýí ÈÑãÌÉ ÇáÌÑÇÝíßÓ ËáÇËí ÇáÃÈÚÇÏ ÍíË Çä Qt áÇÊæÝÑ áß äÇÝÐÉ ÊÑÓã ÚáíåÇ ÈÅÓÊÎÏÇã openGL ÝÞØ Èá íÚÊÈÑ ÇáÃÎíÑ ÚäÕÑ ÑÓæã Ýí QGraphicsViewíäÏãÌ ãÚ ÇáÚäÇÕÑ ÇáÑÓæãíÉ ÇáÃÎÑì Ýí ãÔåÏ æÇÍÏ ÓæÇÁ ßÇäÊ äæÇÝÐ Çæ ÑÓæãÇÊ Çæ ßá ãÇåæ ãÑÆí ÝÌãíÚåã QgraphicsItem.
æÈãÇ ÇääÇ ÓæÝ äÊßáã Úä Ãæá ÈÑäÇãÌ ÝÅää ÓæÝ äÑÓãåÇ Úáì äÇÝÐÉ ÎÇÕÉ áÑÓã ÚäÇÕÑ openGL ÊÏÚì GLWidget Öãä ÇáÝÆÉ QGLWidget .
æÝí ÍÇá Çäß ÑÓã Úáì äÇÝÐÉ ãÓÈÞÇ ÓæÝ ÊÚÑÝ Çä åäÇß ÃÍÏÇË ÎÇÕÉ ÈÇáÑÓã Úáì ÇáäæÇÝÐ (ÏæÇá ãÍãíÉ)
ÊÏÚì paintEvent() æíÊã ÇÓÊÏÚÇÆåÇ ÈÔßá ÊáÞÇÆí Ýí ßá ãÑÉ ÊÍÑß ÇáäÇÝÐÉ Çæ ÊÛíÑ ÍÌãåÇ Çæ ÍÊì ÊÙåÑ äæÇÝÐ ÃÎÑì ÝæÞåÇ Çæ ÈÅÓÊÎÏÇã ÇáÏÇáÉ repaint() æáÚá ÃÎíäÇ ÚãÑ ÇáÚÇÏá ÓæÝ íÊÍÏË Úä åÐÇ ÇáãæÖæÚ Ýí ÓáÓáÉ ÏÑæÓå ááÑÓã ËäÇÆí ÇáÃÈÚÇÏ Ýí Qt .
æáßä ÇáÂä äÍä ÓæÝ äÑÓã Úáì äÇÝÐÉ GL ÝáÐáß ÝÅä ÇáÍÏË íÕÈÍ ÇÓãå paintGL() æíÊã ÇÓÊÏÚÇÁå áÐÇÊ ÇáÔÑæØ ÇáÓÇÈÞÉ Ýí ÇáÑÓã Úáì ÇáäæÇÝÐ ÃäÑ ÇáãËÇá :-

#include <QGLWidget>
class GLWidget : public QGLWidget
{
Q_OBJECT
public:
GLWidget(QWidget *parent = 0);
protected:
void paintGL(); //paintEvent on all windows
void resizeGL(int width, int height);//event called if you resize the window
};

include <QtGui>
#include <QtOpenGL>
#include <math.h>
#include "glwidget.h"
GLWidget::GLWidget(QWidget *parent):QGLWidget(parent){}
void GLWidget::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslated(0.0, 0.0, -10.0);
glBegin(GL_POLYGON);
glColor3d(100,0,0);
glVertex2d(1,1);
glVertex2d(1,-1);
glVertex2d(-1,-1);
glVertex2d(-1,1);
glEnd();
glFlush();
}
void GLWidget::resizeGL(int width, int height)
{
int side = qMin(width, height);
glViewport((width - side) , (height - side), side, side);
glClearColor(0,234,0,255);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-3.0, +3.0, +3.0, -3.0, 0.0, 30.0);
glMatrixMode(GL_MODELVIEW);
}

#include "glwidget.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
GLWidget glw;
glw.show();
return app.exec();
}

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