implement OpenGL commend in Qt QGraphicsItem
1
I reimplement QGraphicsItem::paint, and use opengl to paint. But the opengl commend is not work. No any error. I don't know why.
#include <QtOpenGL>
#include <qwidget.h>
#include <qgraphicsitem.h>
#include <qpainter.h>
#include <qdebug.h>
class ImageGraphicsItem : public QGraphicsItem
{
public:
QRectF boundingRect(void) const
{
return QRectF(0, 0, 100, 100);
}
void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
{
qDebug() << "gl run";
painter->fillRect(0,0,128,128,Qt::green);
painter->beginNativePainting();
glEnable(GL_SCISSOR_TEST);
glScissor(0, 0, 64, 64);
glClearColor(1, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
glEnd();
painter->endNativePainting();
}
private:
};
The ui is followed:
c++ qt qt5
edited Dec 31 '18 at 14:07
πάντα ῥεῖ
72.8k974140
asked Dec 31 '18 at 14:04
袁书豪袁书豪
82
add a comment |
1
I reimplement QGraphicsItem::paint, and use opengl to paint. But the opengl commend is not work. No any error. I don't know why.
#include <QtOpenGL>
#include <qwidget.h>
#include <qgraphicsitem.h>
#include <qpainter.h>
#include <qdebug.h>
class ImageGraphicsItem : public QGraphicsItem
{
public:
QRectF boundingRect(void) const
{
return QRectF(0, 0, 100, 100);
}
void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
{
qDebug() << "gl run";
painter->fillRect(0,0,128,128,Qt::green);
painter->beginNativePainting();
glEnable(GL_SCISSOR_TEST);
glScissor(0, 0, 64, 64);
glClearColor(1, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
glEnd();
painter->endNativePainting();
}
private:
};
The ui is followed:
c++ qt qt5
edited Dec 31 '18 at 14:07
πάντα ῥεῖ
72.8k974140
asked Dec 31 '18 at 14:04
袁书豪袁书豪
82
add a comment |
1
1
1
I reimplement QGraphicsItem::paint, and use opengl to paint. But the opengl commend is not work. No any error. I don't know why.
#include <QtOpenGL>
#include <qwidget.h>
#include <qgraphicsitem.h>
#include <qpainter.h>
#include <qdebug.h>
class ImageGraphicsItem : public QGraphicsItem
{
public:
QRectF boundingRect(void) const
{
return QRectF(0, 0, 100, 100);
}
void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
{
qDebug() << "gl run";
painter->fillRect(0,0,128,128,Qt::green);
painter->beginNativePainting();
glEnable(GL_SCISSOR_TEST);
glScissor(0, 0, 64, 64);
glClearColor(1, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
glEnd();
painter->endNativePainting();
}
private:
};
The ui is followed:
c++ qt qt5
edited Dec 31 '18 at 14:07
πάντα ῥεῖ
72.8k974140
asked Dec 31 '18 at 14:04
袁书豪袁书豪
82
I reimplement QGraphicsItem::paint, and use opengl to paint. But the opengl commend is not work. No any error. I don't know why.
#include <QtOpenGL>
#include <qwidget.h>
#include <qgraphicsitem.h>
#include <qpainter.h>
#include <qdebug.h>
class ImageGraphicsItem : public QGraphicsItem
{
public:
QRectF boundingRect(void) const
{
return QRectF(0, 0, 100, 100);
}
void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
{
qDebug() << "gl run";
painter->fillRect(0,0,128,128,Qt::green);
painter->beginNativePainting();
glEnable(GL_SCISSOR_TEST);
glScissor(0, 0, 64, 64);
glClearColor(1, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
glEnd();
painter->endNativePainting();
}
private:
};
The ui is followed:
c++ qt qt5
c++ qt qt5
edited Dec 31 '18 at 14:07
πάντα ῥεῖ
72.8k974140
asked Dec 31 '18 at 14:04
袁书豪袁书豪
82
edited Dec 31 '18 at 14:07
πάντα ῥεῖ
72.8k974140
asked Dec 31 '18 at 14:04
袁书豪袁书豪
82
edited Dec 31 '18 at 14:07
πάντα ῥεῖ
72.8k974140
edited Dec 31 '18 at 14:07
πάντα ῥεῖ
72.8k974140
edited Dec 31 '18 at 14:07
πάντα ῥεῖ
72.8k974140
72.8k974140
asked Dec 31 '18 at 14:04
袁书豪袁书豪
82
asked Dec 31 '18 at 14:04
袁书豪袁书豪
82
asked Dec 31 '18 at 14:04
袁书豪袁书豪
82
82
add a comment |
add a comment |
1 Answer
1
active
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0
Make sure that the viewport is a QGLWidget in order to do OpenGL rendering in our graphics scene, here is an example :
QGraphicsView view(&scene);
view.setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
answered Dec 31 '18 at 15:08
tunglttunglt
6941210
Thanks for your help. It's working now by your method.
– 袁书豪
Jan 2 at 5:36
@袁书豪 You are welcome.
– tunglt
Jan 2 at 7:49
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
Make sure that the viewport is a QGLWidget in order to do OpenGL rendering in our graphics scene, here is an example :
QGraphicsView view(&scene);
view.setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
answered Dec 31 '18 at 15:08
tunglttunglt
6941210
Thanks for your help. It's working now by your method.
– 袁书豪
Jan 2 at 5:36
@袁书豪 You are welcome.
– tunglt
Jan 2 at 7:49
add a comment |
0
Make sure that the viewport is a QGLWidget in order to do OpenGL rendering in our graphics scene, here is an example :
QGraphicsView view(&scene);
view.setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
answered Dec 31 '18 at 15:08
tunglttunglt
6941210
Thanks for your help. It's working now by your method.
– 袁书豪
Jan 2 at 5:36
@袁书豪 You are welcome.
– tunglt
Jan 2 at 7:49
add a comment |
0
0
0
Make sure that the viewport is a QGLWidget in order to do OpenGL rendering in our graphics scene, here is an example :
QGraphicsView view(&scene);
view.setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
answered Dec 31 '18 at 15:08
tunglttunglt
6941210
Make sure that the viewport is a QGLWidget in order to do OpenGL rendering in our graphics scene, here is an example :
QGraphicsView view(&scene);
view.setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
answered Dec 31 '18 at 15:08
tunglttunglt
6941210
answered Dec 31 '18 at 15:08
tunglttunglt
6941210
answered Dec 31 '18 at 15:08
tunglttunglt
6941210
answered Dec 31 '18 at 15:08
tunglttunglt
6941210
6941210
Thanks for your help. It's working now by your method.
– 袁书豪
Jan 2 at 5:36
@袁书豪 You are welcome.
– tunglt
Jan 2 at 7:49
add a comment |
Thanks for your help. It's working now by your method.
– 袁书豪
Jan 2 at 5:36
@袁书豪 You are welcome.
– tunglt
Jan 2 at 7:49
Thanks for your help. It's working now by your method.
– 袁书豪
Jan 2 at 5:36
Thanks for your help. It's working now by your method.
– 袁书豪
Jan 2 at 5:36
@袁书豪 You are welcome.
– tunglt
Jan 2 at 7:49
@袁书豪 You are welcome.
– tunglt
Jan 2 at 7:49
add a comment |
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