Add clipping plane support for X/Y/Z dimensions.

* New widget for viewing the clipping plane settings.
* Update the viewer to add clipping planes.

cq_editor/main_window.py

@@ -8,6 +8,7 @@
 from .widgets.viewer import OCCViewer
 from .widgets.console import ConsoleWidget
 from .widgets.object_tree import ObjectTree
+from .widgets.clipping_planes import ClippingPlanes
 from .widgets.traceback_viewer import TracebackPane
 from .widgets.debugger import Debugger, LocalsView
 from .widgets.cq_object_inspector import CQObjectInspector
@@ -128,6 +129,13 @@ def prepare_panes(self):
                                               self,
                                               defaultArea='bottom'))
 
+        self.registerComponent('clipping_planes',
+                               ClippingPlanes(self),
+                               lambda c: dock(c,
+                                              'Clipping Planes',
+                                              self,
+                                              defaultArea='right'))
+
         for d in self.docks.values():
             d.show()
 
@@ -259,6 +267,9 @@ def prepare_actions(self):
         self.components['debugger'].sigTraceback\
             .connect(self.components['traceback_viewer'].addTraceback)
 
+        self.components['clipping_planes'].sigClippingPlaneChanged\
+            .connect(self.components['viewer'].update_clipping_plane)
+
         # trigger re-render when file is modified externally or saved
         self.components['editor'].triggerRerender \
             .connect(self.components['debugger'].render)

cq_editor/widgets/clipping_planes.py

@@ -0,0 +1,74 @@
+from PyQt5.QtWidgets import QApplication, QCheckBox, QHBoxLayout, QLabel, QSpinBox, QWidget
+from PyQt5.QtCore import Qt, pyqtSlot, pyqtSignal
+
+from qtconsole.rich_jupyter_widget import RichJupyterWidget
+
+from ..mixins import ComponentMixin
+from ..utils import layout
+
+class ClippingPlane(QWidget):
+
+    sigClippingPlaneChanged = pyqtSignal(bool,int,bool)
+
+    def __init__(self, parent, dimension):
+        super(ClippingPlane, self).__init__(parent)
+
+        self.check = QCheckBox(f"{dimension} Axis", self)
+        self.spinbox = QSpinBox(self)
+        self.spinbox.setValue(50)
+        self.spinbox.setRange(1, 256)
+        self.invert = QCheckBox("Invert", self)
+
+        self.group = layout(self,(self.spinbox,self.invert),layout_type=QHBoxLayout, spacing=5)
+
+        layout(self,(self.check,self.group),layout_type=QHBoxLayout, top_widget=self)
+
+        self.group.setDisabled(True)
+        self.check.stateChanged.connect(self.handleChecked)
+        self.invert.stateChanged.connect(self.handleInvertChecked)
+        self.spinbox.valueChanged.connect(self.handlePositionChanged)
+
+    def handleChecked(self, arg):
+        self.group.setDisabled(not self.check.checkState())
+        self.emitState()
+
+    def handleInvertChecked(self, arg):
+        self.emitState()
+
+    def handlePositionChanged(self, arg):
+        self.emitState()
+
+    def emitState(self):
+        self.sigClippingPlaneChanged.emit(self.check.checkState(), self.spinbox.value(), self.invert.checkState())
+
+class ClippingPlanes(QWidget,ComponentMixin):
+
+    name = 'Clipping Planes'
+
+    sigClippingPlaneChanged = pyqtSignal(str,bool,int,bool)
+
+    def __init__(self, parent):
+        super(ClippingPlanes, self).__init__(parent)
+
+        self.x = ClippingPlane(self, "X")
+        self.x.sigClippingPlaneChanged.connect(self.onXPlaneChanged)
+        self.y = ClippingPlane(self, "Y")
+        self.y.sigClippingPlaneChanged.connect(self.onYPlaneChanged)
+        self.z = ClippingPlane(self, "Z")
+        self.z.sigClippingPlaneChanged.connect(self.onZPlaneChanged)
+
+        layout(self,(self.x,self.y,self.z),top_widget=self)
+
+    @pyqtSlot(bool,int,bool)
+    def onXPlaneChanged(self,enabled,val,inverted):
+        self.sigClippingPlaneChanged.emit("X",enabled,val,inverted)
+
+    @pyqtSlot(bool,int,bool)
+    def onYPlaneChanged(self,enabled,val,inverted):
+        self.sigClippingPlaneChanged.emit("Y",enabled,val,inverted)
+
+    @pyqtSlot(bool,int,bool)
+    def onZPlaneChanged(self,enabled,val,inverted):
+        self.sigClippingPlaneChanged.emit("Z",enabled,val,inverted)
+
+

cq_editor/widgets/viewer.py

@@ -3,14 +3,15 @@
 from PyQt5.QtCore import pyqtSlot, pyqtSignal
 from PyQt5.QtGui import QIcon
 
-from OCP.Graphic3d import Graphic3d_Camera, Graphic3d_StereoMode, Graphic3d_NOM_JADE,\
-    Graphic3d_MaterialAspect
+from OCP.Graphic3d import Graphic3d_Camera, Graphic3d_ClipPlane, Graphic3d_StereoMode, Graphic3d_NOM_JADE,\
+    Graphic3d_MaterialAspect, Graphic3d_Texture2Dplane
 from OCP.AIS import AIS_Shaded,AIS_WireFrame, AIS_ColoredShape, AIS_Axis
-from OCP.Aspect import Aspect_GDM_Lines, Aspect_GT_Rectangular
-from OCP.Quantity import Quantity_NOC_BLACK as BLACK, Quantity_TOC_RGB as TOC_RGB,\
+from OCP.Aspect import Aspect_GDM_Lines, Aspect_GT_Rectangular, Aspect_HS_GRID
+from OCP.TCollection import TCollection_AsciiString
+from OCP.Quantity import Quantity_NOC_BLACK as BLACK, Quantity_NOC_WHITE as WHITE, Quantity_TOC_RGB as TOC_RGB,\
     Quantity_Color
 from OCP.Geom import Geom_Axis1Placement
-from OCP.gp import gp_Ax3, gp_Dir, gp_Pnt, gp_Ax1
+from OCP.gp import gp_Ax3, gp_Dir, gp_Pnt, gp_Ax1, gp_Pln
 
 from ..utils import layout, get_save_filename
 from ..mixins import ComponentMixin
@@ -56,6 +57,14 @@ def __init__(self,parent=None):
         self.canvas = OCCTWidget()
         self.canvas.sigObjectSelected.connect(self.handle_selection)
 
+
+        self.x_clipping_plane = self.setup_clipping_plane('red', gp_Pln(-1, 0.0, 0.0, 100))
+        self.y_clipping_plane = self.setup_clipping_plane('lawngreen', gp_Pln(0.0, -1, 0.0, 100))
+        self.z_clipping_plane = self.setup_clipping_plane('blue', gp_Pln(0.0, 0.0, -1, 100))
+        self.canvas.view.AddClipPlane(self.x_clipping_plane)
+        self.canvas.view.AddClipPlane(self.y_clipping_plane)
+        self.canvas.view.AddClipPlane(self.z_clipping_plane)
+
         self.create_actions(self)
 
         self.layout_ = layout(self,
@@ -66,6 +75,16 @@ def __init__(self,parent=None):
         self.setup_default_drawer()
         self.updatePreferences()
 
+    def setup_clipping_plane(self, color, eq):
+        cp = Graphic3d_ClipPlane()
+        cp.SetEquation(eq)
+        cp.SetCapping(True)
+        cp.SetCappingColor(to_occ_color(color))
+        # cp.SetCappingTexture(Graphic3d_Texture2Dplane(TCollection_AsciiString("./clip-texture.png")))
+        cp.SetOn(False)
+
+        return cp
+
     def setup_default_drawer(self):
 
         # set the default color and material
@@ -369,6 +388,19 @@ def set_selected(self,ais):
 
         self.redraw()
 
+    @pyqtSlot(str,bool,int,bool)
+    def update_clipping_plane(self,plane,enabled,val,inverted):
+        if plane == "X":
+            self.x_clipping_plane.SetEquation(gp_Pln(1 if inverted else -1, 0.0, 0.0, val))
+            self.x_clipping_plane.SetOn(enabled)
+        elif plane == "Y":
+            self.y_clipping_plane.SetEquation(gp_Pln(0.0, 1 if inverted else -1, 0.0, val))
+            self.y_clipping_plane.SetOn(enabled)
+        elif plane == "Z":
+            self.z_clipping_plane.SetEquation(gp_Pln(0.0, 0.0, 1 if inverted else -1, val))
+            self.z_clipping_plane.SetOn(enabled)
+
+        self.redraw()
 
 if __name__ == "__main__":