Nice work Marko, impressive. Regarding your usage of TDocStd_* and friends. Something I like to do myself is not make my code unnessecarily complex. I think for your application its a pretty gray zone whether its yet sufficiently complex to use complex data structures like TDocStd_*, and I do not know the ambitions of your project. Finally, if you have a particular edge case, that would help to investigate the reported issue. I would suggest 2 things: 1) take a look at [1] and [2], which are the best references in PytonOCC's examples regarding TDocStd_* usage. 2) if you can provide an specific case where things go awry, could you add it to the issue tracker on the pythonocc github page?
Thanks, -jelle [1] https://github.com/tpaviot/pythonocc/tree/master/src/examples/Level2/InteractiveFeatureTree [2] https://github.com/tpaviot/pythonocc/tree/master/src/examples/Level2/OCAFBrowser On Tue, Oct 16, 2012 at 4:50 PM, Marko <marko...@gmail.com> wrote: > Hi! > > I'm writing a CAD application where I'm using an instance of > TDocStd_Document to manage my document. Now I'd like to add the > functionality of interactively deleting shapes from the document by > selecting them and pressing 'del' on the keyboard. > > I have already had some success with that, though my solution is very > inelegant and does not work in all cases. I'm providing a minimal > example of my solution below. The interesting parts are the methods > "DocCtrl.add" and "DocCtrl.remove". What would be the "correct way" to > implement these? I have already tried other variations including using > "RemoveShape" instead of "RemoveComponent" but I couldn't get it to > work. The example needs Qt to be installed, if you want an example > based on wxWidgets, I can post that as well. > > Thanks in advance! > Marko > > PS: I'm writing an educational CAD program for use in schools as part > of my master thesis. This is one of the last problems I'm trying to > solve, and I will release my program as open source software in 1 or 2 > months. Here's a screenshot: http://i.imgur.com/eILSL.png > > example code > ------------ > > import sys > from PyQt4 import QtCore, QtGui > from OCC.Display.qtDisplay import qtViewer3d > from OCC import BRepPrimAPI, gp, Quantity, TDocStd, TopAbs, TopLoc > from OCC import TPrsStd, XCAFApp, XCAFDoc, XCAFPrs, TCollection > > > class MainWindow(QtGui.QMainWindow): > > def __init__(self, *args): > QtGui.QMainWindow.__init__(self, *args) > self.resize(900, 640) > self.viewer = Viewer(self) > self.setCentralWidget(self.viewer) > > > class Viewer(qtViewer3d): > > def __init__(self, parent): > qtViewer3d.__init__(self) > > def init2(self): > """Perform the second initialization step.""" > self.InitDriver() > > self.doc_ctrl = DocCtrl() > > # switch selection mode to 'solid': > h = self._display.Context.GetHandle() > context = TPrsStd.TPrsStd_AISViewer().New( > self.doc_ctrl.top_label, h > ).GetObject().GetInteractiveContext().GetObject() > context.OpenLocalContext() > context.ActivateStandardMode(TopAbs.TopAbs_SOLID) > > self._ais_pres = TPrsStd.TPrsStd_AISPresentation().Set( > self.doc_ctrl.top_label, XCAFPrs.XCAFPrs_Driver().GetID() > ).GetObject() > > def repaint(self): > self._ais_pres.Display(True) > self._display.Repaint() > > def keyPressEvent(self, event): > if event.key() == QtCore.Qt.Key_Delete: > shape = self._display.GetSelectedShape() > if shape: > self.doc_ctrl.remove(shape) > self.repaint() > > > class DocCtrl(object): > """Controller for a document object. The document itself > can be accessed as 'self.document'. """ > > def __init__(self): > > # list which associates each shape label with a component > # label - this list is used for deleting shapes: > self._label_list = [] > self._doc_handle = TDocStd.Handle_TDocStd_Document() > self._xcaf_app = XCAFApp.GetApplication().GetObject() > self._xcaf_app.NewDocument( > TCollection.TCollection_ExtendedString(b'MDTV-CAF'), > self._doc_handle) > # The document itself: > self.document = self._doc_handle.GetObject() > self._color_tool = XCAFDoc.XCAFDoc_DocumentTool().ColorTool( > self.document.Main()).GetObject() > self._shape_tool = XCAFDoc.XCAFDoc_DocumentTool().ShapeTool( > self.document.Main()).GetObject() > self.top_label = self._shape_tool.NewShape() > self._loc = TopLoc.TopLoc_Location(gp.gp_Trsf()) > > def add(self, shape): > """Add a shape to the document""" > > shape_label = self._shape_tool.AddShape(shape, False) > comp_label = self._shape_tool.AddComponent( > self.top_label, shape_label, self._loc) > self._color_tool.SetColor(shape_label, > Quantity.Quantity_Color(0, 0, 1, 0), > XCAFDoc.XCAFDoc_ColorGen) > > self._label_list.append([shape_label, comp_label]) > > def remove(self, shape): > """Remove a shape from the document""" > > # get the label of the shape which should be removed > to_remove = self._shape_tool.FindShape(shape) > > # find the shape that corresponds to the label and remove the > # associated component > for shape_label, comp_label in self._label_list: > if shape_label.IsEqual(to_remove): > self._shape_tool.RemoveComponent(comp_label) > break > > > app = QtGui.QApplication(sys.argv) > > win = MainWindow() > win.show() > win.viewer.init2() > > # create and add shapes > box = BRepPrimAPI.BRepPrimAPI_MakeBox(60, 30, 10).Shape() > cyl = BRepPrimAPI.BRepPrimAPI_MakeCylinder(25, 40).Shape() > > tr = gp.gp_Trsf() > tr.SetTranslation(gp.gp_Vec(0, 50, 0)) > loc = TopLoc.TopLoc_Location(tr) > moved_box = box.Moved(loc) > > # these shapes can be deleted by selecting them and pressing 'Del': > win.viewer.doc_ctrl.add(box) > win.viewer.doc_ctrl.add(cyl) > # this shape cannot be deleted in this implementation: > win.viewer.doc_ctrl.add(moved_box) > win.viewer.repaint() > > app.exec_() > > _______________________________________________ > Pythonocc-users mailing list > Pythonocc-users@gna.org > https://mail.gna.org/listinfo/pythonocc-users >
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