Add example for removing a single ais_shape from the context

Author: tpaviot

examples/core_display_erase_shape.py

@@ -0,0 +1,58 @@
+##Copyright 2021 Thomas Paviot ([email protected])
+##
+##This file is part of pythonOCC.
+##
+##pythonOCC is free software: you can redistribute it and/or modify
+##it under the terms of the GNU Lesser General Public License as published by
+##the Free Software Foundation, either version 3 of the License, or
+##(at your option) any later version.
+##
+##pythonOCC is distributed in the hope that it will be useful,
+##but WITHOUT ANY WARRANTY; without even the implied warranty of
+##MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+##GNU Lesser General Public License for more details.
+##
+##You should have received a copy of the GNU Lesser General Public License
+##along with pythonOCC.  If not, see <http://www.gnu.org/licenses/>.
+
+from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeBox, BRepPrimAPI_MakeCylinder, BRepPrimAPI_MakeSphere
+from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_Transform
+from OCC.Core.gp import gp_Trsf, gp_Vec
+
+from OCC.Display.SimpleGui import init_display
+
+def erase_box(event=None):
+    display.Context.Erase(ais_box, True)
+
+def erase_cylinder(event=None):
+    display.Context.Erase(ais_cylinder, True)
+
+def erase_sphere(event=None):
+    display.Context.Erase(ais_sphere, True)
+
+display, start_display, add_menu, add_function_to_menu = init_display()
+# a box at the origin
+a_box = BRepPrimAPI_MakeBox(10., 20., 30.).Shape()
+
+# a translated sphere along the x axis
+trns = gp_Trsf()
+trns.SetTranslation(gp_Vec(50, 0, 0))
+a_sphere = BRepBuilderAPI_Transform(BRepPrimAPI_MakeSphere(10.).Shape(), trns, False).Shape()
+
+# a translated cylinder along the x axis
+trns = gp_Trsf()
+trns.SetTranslation(gp_Vec(-50, 0, 0))
+a_cylinder = BRepBuilderAPI_Transform(BRepPrimAPI_MakeCylinder(10., 40.).Shape(), trns, False).Shape()
+
+ais_box = display.DisplayShape(a_box)[0]
+ais_sphere = display.DisplayShape(a_sphere)[0]
+ais_cylinder = display.DisplayShape(a_cylinder)[0]
+
+
+if __name__ == '__main__':
+    add_menu('Erase Shapes')
+    add_function_to_menu('Erase Shapes', erase_box)
+    add_function_to_menu('Erase Shapes', erase_cylinder)
+    add_function_to_menu('Erase Shapes', erase_sphere)
+    display.FitAll()
+    start_display()