Add qt5 simple app example

Author: tpaviot

examples/core_display_qt5_app.py

@@ -0,0 +1,65 @@
+##Author github user @Tanneguydv, 2021
+
+import sys
+from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeBox
+
+from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QHBoxLayout, QGroupBox, QDialog, QVBoxLayout
+
+from OCC.Display.backend import load_backend
+load_backend('qt-pyqt5')
+import OCC.Display.qtDisplay as qtDisplay
+
+class App(QDialog):
+
+    def __init__(self):
+        super().__init__()
+        self.title = 'PyQt5 / pythonOCC'
+        self.left = 300
+        self.top = 300
+        self.width = 800
+        self.height = 300
+        self.initUI()
+
+    def initUI(self):
+        self.setWindowTitle(self.title)
+        self.setGeometry(self.left, self.top, self.width, self.height)
+        self.createHorizontalLayout()
+
+        windowLayout = QVBoxLayout()
+        windowLayout.addWidget(self.horizontalGroupBox)
+        self.setLayout(windowLayout)
+        self.show()
+
+    def createHorizontalLayout(self):
+        self.horizontalGroupBox = QGroupBox("Display PythonOCC")
+        layout = QHBoxLayout()
+
+        disp = QPushButton('Display Box', self)
+        disp.clicked.connect(self.displayBOX)
+        layout.addWidget(disp)
+
+        eras = QPushButton('Erase Box', self)
+        eras.clicked.connect(self.eraseBOX)
+        layout.addWidget(eras)
+
+        self.canvas = qtDisplay.qtViewer3d(self)
+        layout.addWidget(self.canvas)
+        self.canvas.resize(200, 200)
+        self.canvas.InitDriver()
+        self.display = self.canvas._display
+        self.horizontalGroupBox.setLayout(layout)
+
+    def displayBOX(self):
+        a_box = BRepPrimAPI_MakeBox(10., 20., 30.).Shape()
+        self.ais_box = self.display.DisplayShape(a_box)[0]
+        self.display.FitAll()
+
+    def eraseBOX(self):
+        self.display.Context.Erase(self.ais_box, True)
+
+
+
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+    ex = App()
+    sys.exit(app.exec_())