Source code for anatomist.cpp.followerobject

# -*- coding: utf-8 -*-
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''' Follower object module

A "follower" object is a small representation of the bounding box of an object
(a cube or parallelepiped) which follows its position and orientation.

main class: :class:``ObjectFollowerCube`
'''

import anatomist.cpp as anatomist
from soma import aims
import numpy




class ObjectFollowerCube(anatomist.ASurface_2):
    ''' Cube (or parallelepiped) representing the bounding box of an object,
    or of several objects.
    '''

    def __init__(self, obj):
        anatomist.ASurface_2.__init__(self)
        self.GetMaterial().set({'ghost': 1})
        self._objects = []
        # print 'ObjectFollowerCube.__init__, objects:', len( obj )
        self.setSurface(aims.AimsTimeSurface_2_VOID())
        self.setObserved(obj)

    def observed(self):
        return self._objects



    def setObserved(self, obj):
        'sets the observed objects'

        #print 'setObserved', len(obj)
        oldobj = [i for i in self._objects]
        for i in oldobj:
            self.unregisterObservable(i.get())
        del oldobj
        self._objects = [anatomist.weak_ptr_AObject(i) for i in obj]
        for i in obj:
            self.registerObservable(i)
        self.redraw()




    def update(self, obs, param):
        #print 'ObjectFollowerCube.update'
        if obs in self._objects:
            self.redraw()
            self.notifyObservers(obs)




    def unregisterObservable(self, obs):
        #print 'ObjectFollowerCube.unregisterObservable', obs
        obss = anatomist.weak_ptr_AObject(obs)
        if obss in self._objects:
            self._objects = [i for i in self._objects if i != obss]
            self.redraw()




    def boundingbox(self):
        'object(s) bounding box'

        #print 'ObjectFollowerCube.boundingbox', len( self._objects )
        bbox = []
        for obj in self._objects:
            bbox2 = [aims.Point3df(x[:3]) for x in obj.boundingbox()]
            if not bbox2:
                # this object has no bbox
                continue
            a = anatomist.Anatomist()
            tr = a.getTransformation(obj.getReferential(),
                                     self.getReferential())
            if tr is not None:
                bbox2 = tr.transformBoundingBox(bbox2[0], bbox2[1])
            if not bbox:
                bbox = bbox2
            else:
                bbox = [numpy.min([bbox[0], bbox2[0]], axis=0),
                        numpy.max([bbox[1], bbox2[1]], axis=0)]
                #print 'bbox:', bbox
        if not bbox:
            return ()
        return (aims.vector_FLOAT(bbox[0]), aims.vector_FLOAT(bbox[1]))




    def redraw(self):
        're-calculates the bounding mesh'

        if hasattr(self, '_redrawing'):
            return
        self._redrawing = True
        #print 'ObjectFollowerCube.redraw'
        mesh = self.surface()
        if mesh.isNull():
            self.setSurface(aims.AimsTimeSurface_2_VOID())
            mesh = self.surface()
        if len(self._objects) == 0:
            mesh.vertex().assign([])
            mesh.normal().assign([])
            mesh.polygon().assign([])
        else:
            bbox = self.boundingbox()
            if len(bbox) == 2:
                cube = aims.SurfaceGenerator.parallelepiped_wireframe(
                    bbox[0][:3], bbox[1][:3])
                mesh.vertex().assign(cube.vertex())
                mesh.polygon().assign(cube.polygon())
        self.setChanged()
        del self._redrawing