open cascade Questions about the display

[hello]

TopoDS_Shape t_topo_box = BRepPrimAPI_MakeBox(1, 1, 1).Shape();
Handle(AIS_Shape) t_ais_box = new AIS_Shape(t_topo_box);
t_ais_box->SetColor(Quantity_NOC_CHOCOLATE);
m_context->Display(t_ais_box,true);

This code runs and displays normally in the MainWindow

MainWindow * a;
a =new MainWindow();
TopoDS_Shape t_topo_box = BRepPrimAPI_MakeBox(1, 1, 1).Shape();
Handle(AIS_Shape) t_ais_box = new AIS_Shape(t_topo_box);
t_ais_box->SetColor(Quantity_NOC_CHOCOLATE);
a->getContext()->Display(t_ais_box,true);
I have defined the MainWindow pointer ain pipeLayout as normal, running this code with no error but no display

 

[natalia]

Hi, hello)

Could you please explain in more details what the 'MainWindow' is?
Is it an instance of QMainWindow widget or some object from OCCT examples or a python instance or some else?
If you share some code how you organize the pipeLayout, it also be helpful.

Regards, Natalia

 

[hello]

 

[hello]

Hi, hello)

Could you please explain in more details what the 'MainWindow' is?
Is it an instance of QMainWindow widget or some object from OCCT examples or a python instance or some else?
If you share some code how you organize the pipeLayout, it also be helpful.

Regards, Natalia

I can only call Display in the mainwindow. cpp and C3DView.cpp files to Display primitives. Calling display in other cpp files of the project will work, but I cannot display primitives in the Mainwindow window. Do you understand if I say this? I look forward to your reply. Thank you

 

[natalia]

Your code looks correct. There should not be a problem using display out of these classes.
Your case requires some debug and investigations.

What happens if you change background of the viewer instead of calling 'Display' for a presentation? Let's firstly check that your UI control is repainted out of these methods?

Regards, Natalia

 

[hello]

Your code looks correct. There should not be a problem using display out of these classes.
Your case requires some debug and investigations.

What happens if you change background of the viewer instead of calling 'Display' for a presentation? Let's firstly check that your UI control is repainted out of these methods?

Regards, Natalia

I'm sorry, I don't quite follow you. Could you be more specific?

 

[natalia]

Hi, hello

Add the next code out of the mentioned classes, in place, where your 'Display' doesn't provide the presentation display:

const Handle(V3d_Viewer)& viewer = GetContext()->CurrentViewer();
const Handle(V3d_View)& view = aViewer->ActiveViewIterator().Value();
view->SetBackgroundColor(Quantity_NOC_YELLOW);

Let's check if the viewer is updated correctly.
Regards, Natalia

 

[hello]

Thank you for your response, unfortunately the view was not updated correctly

 

[natalia]

What if you add the next row after your code:

view->Redraw();

 

[hello]

What if you add the next row after your code:

view->Redraw();

Thank you for your reply. Unfortunately, there is still no change

 

[natalia]

Hi hello

You know, for Qt-based applications, we usually implement own class, inherited from QWidget or QGLWidget with some special code to manage OCCT viewer.
The minimum example is available here: ‘https://gitlab.com/ssv/lessons’. It's the ViewerWidget in Lesson18_Qt_Widgets or in extras_viewerNative.
Also, there is example in OCCT samples, it's View.h, that is placed in occt/samples/qt/Common/src/View.hxx/.cxx.

The main thing is custom definition of 'paintEvent' that moves painting into OCCT viewer and setting some custom attributes for the widget.

These samples are not UI-based. To use this class in UI-controls, it's possible to create an empty widget in UI and set this widget inside it using C++ code.

Regards, Natalia

 

[hello]

I carefully reviewed the information you recommended, but I didn't understand what you were trying to get me to know. Or do you have a problem guessing what my code is

 

[natalia]

Hi hello,

I meant, what if to try using View or ViewerWidget instead of your C3DView for start. The goal is to avoid defining the widget for view as a UI designer class.

Regards, Natalia

 

[kaviraj]

i defined my canvas display inside a qhorizontal layout, but my problem is , while running its always getting displyaed in a minimized version
only after some resize event occurs on that window(like if if minimize or resize the screen), the problem is getting solved like below





def initialise_canvas_display_requirements(self):
self.canvas = qtDisplay.qtViewer3d(self.ui.centralwidget)
# self.canvas.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding) # Set size policy
# self.canvas.setMinimumSize(1400,900)
# self.canvas.resize(1466,890)
# self.canvas.setMinimumSize(1450,900)
self.canvas.setSizePolicy(QSizePolicy.Expanding,QSizePolicy.Expanding)
self.canvas.InitDriver()
self.display = self.canvas._display
self.display.View.SetBgGradientColors(
Quantity_Color(Quantity_NOC_WHITE),
Quantity_Color(Quantity_NOC_WHITE),
2,
True,
)
self.display.display_triedron()



self.ui.layout_random.addWidget(self.canvas)
self.display.register_select_callback(self.canvas_clicked_callback)
self.display.Viewer.SetDefaultLights()
self.display.Viewer.SetLightOn()
self.display.View.FitAll()

# self.mainwindow.showNormal()
# self.mainwindow.showMaximized()
# sys.exit(self.app.exec_())
# self.mainwindow.resize(self.mainwindow.width() + 100, self.mainwindow.height()) # Increase width by 1 pixel
# self.mainwindow.resize(self.mainwindow.width() - 100, self.mainwindow.height()) # Decrease width by 1 pixel




def display_shape_requirements(self,filepath):
self.data_obj=data_handle("project_data",filepath)
self.display.EraseAll()
self.data_obj.read_file()
self.shap=get_step_shape(self.data_obj.get_project_data("stepfile_path"))

# self.display.DisplayShape(self.shap)
self.display.DisplayColoredShape(self.shap,OCCViewer.rgb_color(80/255, 80/255, 80/255))
self.display.FitAll()
# self.display.EraseAll()
self.face_list=Get_from_topods_shape.topods_faces(self.shap)
self.display.SetSelectionMode(mode=TopAbs_FACE)


this is how i am initializing and displaying the canvas
i even tried automatically maximizing the screen , but it doesn't works

also fixing the screen size works , but each system's screen size is getting varied, so we can't follow that

anyone with solution for this ?

 

[natalia]

Hello @kaviraj
A very similar problem was processed in OpenCascade long time ago in the following issue: https://tracker.dev.opencascade.org/view.php?id=26603.

The solution to your problem is placed in implementation of 'paintEvent' and 'resizeEvent' of redefined widget.
For an example, take a look at the OpenCascade samples (View class) or tools (View_Widget class).
Or, with the implementation suggested in the lesson mentioned above: 'https://gitlab.com/ssv/lessons'

Regards, Natalia