[SOLVED]How to draw a filled rectangle on QGraphicsScene using QPainter

adnan

Isn't there something like scene->addFilledRect(......)

Sam

You can add a QGraphicsRectItem to the scene .

something like

@#include <QtGui>
int main(int argc,char ** argv)
{
QApplication app(argc,argv);

QGraphicsScene scene;
QGraphicsView view(&scene);
QGraphicsRectItem* item1 = new QGraphicsRectItem(0,0,100,100);
QGraphicsRectItem* item2 = new QGraphicsRectItem(0,100,100,100);
QGraphicsRectItem* item3 = new QGraphicsRectItem(100,0,100,100);
QGraphicsRectItem* item4 = new QGraphicsRectItem(100,100,100,100);

item1->setBrush(QBrush(Qt::red));
item2->setBrush(QBrush(Qt::green));
item3->setBrush(QBrush(Qt::blue));
item4->setBrush(QBrush(Qt::yellow));

scene.addItem(item1);
scene.addItem(item2);
scene.addItem(item3);
scene.addItem(item4);

view.setFixedSize(250,250);
view.setWindowTitle("QGraphicsRectItem Color Example");
view.show();

return app.exec();
}@

adnan

Thanks a lot! such a good piece of code!

adnan

Is it possible to draw the above rectangles with gradient effects like, light in middle and dark at top and bottom, to give a 3D effect.

Sam

Yes for the gradients you can check "QLinearGradient Class":http://doc.qt.nokia.com/4.7-snapshot/qlineargradient.html#details

for eg

@QLinearGradient grad1(0, 20, 0, 110);

grad1.setColorAt(0.1, Qt::red);
grad1.setColorAt(0.5, Qt::yellow);
grad1.setColorAt(0.9, Qt::red);

QLinearGradient grad2(0, 20, 0, 110);

grad2.setColorAt(0.1, Qt::green);
grad2.setColorAt(0.5, Qt::white);
grad2.setColorAt(0.9, Qt::green);

QLinearGradient grad3(0, 20, 0, 110);

grad3.setColorAt(0.1, Qt::blue);
grad3.setColorAt(0.5, Qt::white);
grad3.setColorAt(0.9, Qt::blue);

QLinearGradient grad4(0, 20, 0, 110);

grad4.setColorAt(0.1, Qt::yellow);
grad4.setColorAt(0.5, Qt::red);
grad4.setColorAt(0.9, Qt::yellow);

item1->setBrush(grad1);
item2->setBrush(grad2);
item3->setBrush(grad3);
item4->setBrush(grad4);@

Which displays as

!http://imageshack.us/a/img259/6941/80671453.png(gradient)!

adnan

Thanks for your reply!

Sam

Glad to be of some help. You are welcome :)

prabuqt

good work sam....!