# coding: utf-8
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"""This module provides 2D data and RGB(A) image item class.
"""
from __future__ import absolute_import
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "15/11/2017"
import numpy
from ..scene import primitives, utils
from .core import DataItem3D, ItemChangedType
from .mixins import ColormapMixIn, InterpolationMixIn
from ._pick import PickingResult
class _Image(DataItem3D, InterpolationMixIn):
"""Base class for images
:param parent: The View widget this item belongs to.
"""
def __init__(self, parent=None):
DataItem3D.__init__(self, parent=parent)
InterpolationMixIn.__init__(self)
def _setPrimitive(self, primitive):
InterpolationMixIn._setPrimitive(self, primitive)
def getData(self, copy=True):
raise NotImplementedError()
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]
"""
rayObject = context.getPickingSegment(frame=self._getScenePrimitive())
if rayObject is None:
return None
points = utils.segmentPlaneIntersect(
rayObject[0, :3],
rayObject[1, :3],
planeNorm=numpy.array((0., 0., 1.), dtype=numpy.float64),
planePt=numpy.array((0., 0., 0.), dtype=numpy.float64))
if len(points) == 1: # Single intersection
if points[0][0] < 0. or points[0][1] < 0.:
return None # Outside image
row, column = int(points[0][1]), int(points[0][0])
data = self.getData(copy=False)
height, width = data.shape[:2]
if row < height and column < width:
return PickingResult(
self,
positions=[(points[0][0], points[0][1], 0.)],
indices=([row], [column]))
else:
return None # Outside image
else: # Either no intersection or segment and image are coplanar
return None
[docs]class ImageData(_Image, ColormapMixIn):
"""Description of a 2D image data.
:param parent: The View widget this item belongs to.
"""
def __init__(self, parent=None):
_Image.__init__(self, parent=parent)
ColormapMixIn.__init__(self)
self._data = numpy.zeros((0, 0), dtype=numpy.float32)
self._image = primitives.ImageData(self._data)
self._getScenePrimitive().children.append(self._image)
# Connect scene primitive to mix-in class
ColormapMixIn._setSceneColormap(self, self._image.colormap)
_Image._setPrimitive(self, self._image)
[docs] def setData(self, data, copy=True):
"""Set the image data to display.
The data will be casted to float32.
:param numpy.ndarray data: The image data
:param bool copy: True (default) to copy the data,
False to use as is (do not modify!).
"""
self._image.setData(data, copy=copy)
ColormapMixIn._setRangeFromData(self, self.getData(copy=False))
self._updated(ItemChangedType.DATA)
[docs] def getData(self, copy=True):
"""Get the image data.
:param bool copy:
True (default) to get a copy,
False to get internal representation (do not modify!).
:rtype: numpy.ndarray
:return: The image data
"""
return self._image.getData(copy=copy)
[docs]class ImageRgba(_Image, InterpolationMixIn):
"""Description of a 2D data RGB(A) image.
:param parent: The View widget this item belongs to.
"""
def __init__(self, parent=None):
_Image.__init__(self, parent=parent)
InterpolationMixIn.__init__(self)
self._data = numpy.zeros((0, 0, 3), dtype=numpy.float32)
self._image = primitives.ImageRgba(self._data)
self._getScenePrimitive().children.append(self._image)
# Connect scene primitive to mix-in class
_Image._setPrimitive(self, self._image)
[docs] def setData(self, data, copy=True):
"""Set the RGB(A) image data to display.
Supported array format: float32 in [0, 1], uint8.
:param numpy.ndarray data:
The RGBA image data as an array of shape (H, W, Channels)
:param bool copy: True (default) to copy the data,
False to use as is (do not modify!).
"""
self._image.setData(data, copy=copy)
self._updated(ItemChangedType.DATA)
[docs] def getData(self, copy=True):
"""Get the image data.
:param bool copy:
True (default) to get a copy,
False to get internal representation (do not modify!).
:rtype: numpy.ndarray
:return: The image data
"""
return self._image.getData(copy=copy)
