Game Development

The signal emitted can be caught by a class that controls the QPainter, the slot can be as such

Class visualizer { Public slot: Void character_health_affected { //show blood or shake effect styled images //timeout the blood, hide/delete blood effects after a few seconds } }

@Chris-Kawa wow I can’t believe I missed that.
I’m sure that is the issue, I will try this solution right away.

@milhao
Have you had a look at, say

https://doc.qt.io/qt-5/qtwidgets-statemachine-eventtransitions-example.html https://cpp.hotexamples.com/examples/-/QStateMachine/-/cpp-qstatemachine-class-examples.html

Sorry, I should have provided some code to test it.

#include <QtWidgets> unsigned long f = 0; class Character : public QWidget { public: Character(); ~Character(); QPixmap *getPixmap(); protected: void paintEvent(QPaintEvent *e); }; Character::Character() : QWidget(){} Character::~Character(){} void Character::paintEvent(QPaintEvent *event){ Q_UNUSED(event); QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); painter.setRenderHint(QPainter::SmoothPixmapTransform); painter.setBrush(QBrush(QColor(255, 255, 255))); painter.drawEllipse(QRectF(0, 0, 79, 79)); for(int i = (f % 10); i <= 80; i += 10){ if(i<50) painter.drawArc(0, i, 79, 80-i*1.5, 0, 180*16); else painter.drawArc(0, 50-(i-50), 79, (i-55)*2, 180*16, 180*16); } painter.end(); f++; } int main(int argc, char *argv[]){ QApplication app(argc, argv); Character *c = new Character(); QTimer t; QObject::connect(&t, &QTimer::timeout, c, static_cast<void(QWidget::*)()>(&QWidget::update)); t.start(30); c->show(); return app.exec(); }

Sure you can use the same button for the sequence.

@milhao
I assume you drag and drop a comboBox in you're ui.file and then set the items, if this is you're case you can try :

-Go to the ui.file , right click on the comboBox , GoToSlot -> select on CurrentTextChanged, then , in the method that is created automathically you write this:

void MainWindow::on_comboBox_1_currentTextChanged(const QString &arg1) { if(ui->comboBox_1->currentText()=="elf"){ qDebug()<<" you have chosen --> "<<ui->comboBox_1->currentText(); }else if(ui->comboBox_1->currentText()=="human"){ qDebug()<<" you have chosen --> "<<ui->comboBox_1->currentText(); } }

The falling COLLADA (.dae) cube using PySide6, PyQt6, Bullet Physics, and OpenGL 3.3:

PySide6: https://github.com/8Observer8/falling-collada-cube-bullet-physics-opengl33-pyside6 PyQt6: https://github.com/8Observer8/falling-collada-cube-bullet-physics-opengl33-pyqt6

You should install these packages:

pip install PySide6 (or PyQt6) pip install PyOpenGL pip install numpy pip install Panda3D (for Bullet Physics)

falling-collada-cube.gif

A few basic changes in PyQt6 regarding shader-based OpenGL graphics

@QtLukasz Looks interesting

I found out what was the problem:

The Window, which hosts the layout in which the 3D Widget is set, contains the following statement in the constructor:

setWindowState(windowState() | Qt::WindowMaximized);

or..

setWindowState(Qt::WindowMaximized);

I removed this statement and the 3D Window now shows the content.

This is not happening in the Linux build!

Now, both builds work correctly.

Issue is solved.

@JonB You’re right, Thanks, QGraphicsItemGroup did the trick. I just needed to set the transform origin point to the centre of the red rectangle. Now the desired effect is achieved by this code:

#include "game.h" #include <QGraphicsItemGroup> QGraphicsItemGroup* g = new QGraphicsItemGroup; Game::Game() { player = new QGraphicsRectItem(); rectItem = new QGraphicsRectItem(); m_view = new QGraphicsView(this); m_view->setSceneRect(QRectF(0,0,800,600)); this->setBackgroundBrush(Qt::black); m_view->setScene(this); m_view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); m_view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); m_view->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform); m_view->setViewportUpdateMode(QGraphicsView::NoViewportUpdate); m_view->show(); player->setRect(0,0,100,100); player->setBrush(Qt::red); player->setPos(400,300); player->setFocus(); rectItem->setRect(0,0,100,100); rectItem->setBrush(Qt::green); rectItem->setPos(400,330); this->addItem(g); player->setZValue(10); rectItem->setZValue(1); g->addToGroup(player); g->addToGroup(rectItem); g->setTransformOriginPoint(player->pos().x() + player->boundingRect().width()/2 ,player->pos().y() + player->boundingRect().height()/2); } void Game::advance() { } void Game::keyPressEvent(QKeyEvent *event) { switch(event->key()) { case Qt::Key_Left : g->moveBy(-5,0); break; case Qt::Key_Right : g->moveBy(5,0); break; case Qt::Key_Up : g->moveBy(0,-5); break; case Qt::Key_Down : g->moveBy(0,5); break; case Qt::Key_Q : g->setRotation(g->rotation()- 3); break; case Qt::Key_W : g->setRotation(g->rotation() +3); break; } update(); }

@kevin_d
I dont know this topic well but recommend you see : https://doc.qt.io/qt-6/qsgmaterialshader-graphicspipelinestate.html
or use some environments like ie

qputenv("QT3D_GLSL100_WORKAROUND", "");

The qputenv("QT3D_GLSL100_WORKAROUND", "") instruction is a workaround related to Qt3D
shaders on some embedded Linux devices, such as the Raspberry Pi. It will enable a separate
GLSL 1.00 snippet for the lights required by some embedded devices.
Maybe you must see this kind of variables.

Finally the scene gets properly rendered by explicietely setting the QSortPolicy on the frameGraph:

Qt3DRender::QFrameGraphNode *framegraph = view.activeFrameGraph(); Qt3DRender::QSortPolicy *sortPolicy = new Qt3DRender::QSortPolicy(scene); framegraph->setParent(sortPolicy); QVector<Qt3DRender::QSortPolicy::SortType> sortTypes = QVector<Qt3DRender::QSortPolicy::SortType>() << Qt3DRender::QSortPolicy::BackToFront; sortPolicy->setSortTypes(sortTypes); view.setActiveFrameGraph(framegraph);

@Darksorrow said in High CPU usage:

If i can't figure this out i think i'll go back to use OpenGL directly >.<

I have the same problem>.<!
Any good results？

If you like to have a look on how the scene-loader works with nested objects and materials, have a look on the topic:

https://forum.qt.io/topic/134729/q-qt3d-c-apply-qmaterial-on-a-loaded-obj-file/3