# coding: utf-8
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"""This module provides a scene clip plane class.
"""
from __future__ import absolute_import
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "15/11/2017"
import numpy
from ..scene import primitives, utils
from ._pick import PickingResult
from .core import Item3D
from .mixins import PlaneMixIn
[docs]class ClipPlane(Item3D, PlaneMixIn):
"""Represents a clipping plane that clips following items within the group.
For now only on clip plane is allowed at once in a scene.
"""
def __init__(self, parent=None):
plane = primitives.ClipPlane()
Item3D.__init__(self, parent=parent, primitive=plane)
PlaneMixIn.__init__(self, plane=plane)
def __pickPreProcessing(self, context):
"""Common processing for :meth:`_pickPostProcess` and :meth:`_pickFull`
:param PickContext context: Current picking context
:return None or (bounds, intersection points, rayObject)
"""
plane = self._getPlane()
planeParent = plane.parent
if planeParent is None:
return None
rayObject = context.getPickingSegment(frame=plane)
if rayObject is None:
return None
bounds = planeParent.bounds(dataBounds=True)
rayClip = utils.clipSegmentToBounds(rayObject[:, :3], bounds)
if rayClip is None:
return None # Ray is outside parent's bounding box
points = utils.segmentPlaneIntersect(
rayObject[0, :3],
rayObject[1, :3],
planeNorm=self.getNormal(),
planePt=self.getPoint())
# A single intersection inside bounding box
picked = (len(points) == 1 and
numpy.all(bounds[0] <= points[0]) and
numpy.all(points[0] <= bounds[1]))
return picked, points, rayObject
def _pick(self, context):
# Perform picking before modifying context
result = super(ClipPlane, self)._pick(context)
# Modify context if needed
if self.isVisible() and context.isEnabled():
info = self.__pickPreProcessing(context)
if info is not None:
picked, points, rayObject = info
plane = self._getPlane()
if picked: # A single intersection inside bounding box
# Clip NDC z range for following brother items
ndcIntersect = plane.objectToNDCTransform.transformPoint(
points[0], perspectiveDivide=True)
ndcNormal = plane.objectToNDCTransform.transformNormal(
self.getNormal())
if ndcNormal[2] < 0:
context.setNDCZRange(-1., ndcIntersect[2])
else:
context.setNDCZRange(ndcIntersect[2], 1.)
else:
# TODO check this might not be correct
rayObject[:, 3] = 1. # Make sure 4h coordinate is one
if numpy.sum(rayObject[0] * self.getParameters()) < 0.:
# Disable picking for remaining brothers
context.setEnabled(False)
return result
def _pickFastCheck(self, context):
return True
def _pickFull(self, context):
"""Perform picking in this item at given widget position.
:param PickContext context: Current picking context
:return: Object holding the results or None
:rtype: Union[None,PickingResult]
"""
info = self.__pickPreProcessing(context)
if info is not None:
picked, points, _ = info
if picked:
return PickingResult(self, positions=[points[0]])
return None
