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"""This module provides 2D and 3D scatter data item class.
"""
from __future__ import absolute_import
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "15/11/2017"
import collections
import logging
import sys
import numpy
from ..scene import function, primitives, utils
from .core import DataItem3D, Item3DChangedType, ItemChangedType
from .mixins import ColormapMixIn, SymbolMixIn
_logger = logging.getLevelName(__name__)
[docs]class Scatter3D(DataItem3D, ColormapMixIn, SymbolMixIn):
"""Description of a 3D scatter plot.
:param parent: The View widget this item belongs to.
"""
# TODO supports different size for each point
def __init__(self, parent=None):
DataItem3D.__init__(self, parent=parent)
ColormapMixIn.__init__(self)
SymbolMixIn.__init__(self)
noData = numpy.zeros((0, 1), dtype=numpy.float32)
symbol, size = self._getSceneSymbol()
self._scatter = primitives.Points(
x=noData, y=noData, z=noData, value=noData, size=size)
self._scatter.marker = symbol
self._getScenePrimitive().children.append(self._scatter)
# Connect scene primitive to mix-in class
ColormapMixIn._setSceneColormap(self, self._scatter.colormap)
def _updated(self, event=None):
"""Handle mix-in class updates"""
if event in (ItemChangedType.SYMBOL, ItemChangedType.SYMBOL_SIZE):
symbol, size = self._getSceneSymbol()
self._scatter.marker = symbol
self._scatter.setAttribute('size', size, copy=True)
super(Scatter3D, self)._updated(event)
[docs] def setData(self, x, y, z, value, copy=True):
"""Set the data of the scatter plot
:param numpy.ndarray x: Array of X coordinates (single value not accepted)
:param y: Points Y coordinate (array-like or single value)
:param z: Points Z coordinate (array-like or single value)
:param value: Points values (array-like or single value)
:param bool copy:
True (default) to copy the data,
False to use provided data (do not modify!)
"""
self._scatter.setAttribute('x', x, copy=copy)
self._scatter.setAttribute('y', y, copy=copy)
self._scatter.setAttribute('z', z, copy=copy)
self._scatter.setAttribute('value', value, copy=copy)
ColormapMixIn._setRangeFromData(self, self.getValues(copy=False))
self._updated(ItemChangedType.DATA)
[docs] def getData(self, copy=True):
"""Returns data as provided to :meth:`setData`.
:param bool copy: True to get a copy,
False to return internal data (do not modify!)
:return: (x, y, z, value)
"""
return (self.getXData(copy),
self.getYData(copy),
self.getZData(copy),
self.getValues(copy))
[docs] def getXData(self, copy=True):
"""Returns X data coordinates.
:param bool copy: True to get a copy,
False to return internal array (do not modify!)
:return: X coordinates
:rtype: numpy.ndarray
"""
return self._scatter.getAttribute('x', copy=copy)
[docs] def getYData(self, copy=True):
"""Returns Y data coordinates.
:param bool copy: True to get a copy,
False to return internal array (do not modify!)
:return: Y coordinates
:rtype: numpy.ndarray
"""
return self._scatter.getAttribute('y', copy=copy)
[docs] def getZData(self, copy=True):
"""Returns Z data coordinates.
:param bool copy: True to get a copy,
False to return internal array (do not modify!)
:return: Z coordinates
:rtype: numpy.ndarray
"""
return self._scatter.getAttribute('z', copy=copy)
[docs] def getValues(self, copy=True):
"""Returns data values.
:param bool copy: True to get a copy,
False to return internal array (do not modify!)
:return: data values
:rtype: numpy.ndarray
"""
return self._scatter.getAttribute('value', copy=copy)
[docs]class Scatter2D(DataItem3D, ColormapMixIn, SymbolMixIn):
"""2D scatter data with settable visualization mode.
:param parent: The View widget this item belongs to.
"""
_VISUALIZATION_PROPERTIES = {
'points': ('symbol', 'symbolSize'),
'lines': ('lineWidth',),
'solid': (),
}
"""Dict {visualization mode: property names used in this mode}"""
def __init__(self, parent=None):
DataItem3D.__init__(self, parent=parent)
ColormapMixIn.__init__(self)
SymbolMixIn.__init__(self)
self._visualizationMode = 'points'
self._heightMap = False
self._lineWidth = 1.
self._x = numpy.zeros((0,), dtype=numpy.float32)
self._y = numpy.zeros((0,), dtype=numpy.float32)
self._value = numpy.zeros((0,), dtype=numpy.float32)
self._cachedLinesIndices = None
self._cachedTrianglesIndices = None
# Connect scene primitive to mix-in class
ColormapMixIn._setSceneColormap(self, function.Colormap())
def _updated(self, event=None):
"""Handle mix-in class updates"""
if event in (ItemChangedType.SYMBOL, ItemChangedType.SYMBOL_SIZE):
symbol, size = self._getSceneSymbol()
for child in self._getScenePrimitive().children:
if isinstance(child, primitives.Points):
child.marker = symbol
child.setAttribute('size', size, copy=True)
elif event == ItemChangedType.VISIBLE:
# TODO smart update?, need dirty flags
self._updateScene()
super(Scatter2D, self)._updated(event)
[docs] def supportedVisualizations(self):
"""Returns the list of supported visualization modes.
See :meth:`setVisualizationModes`
:rtype: tuple of str
"""
return tuple(self._VISUALIZATION_PROPERTIES.keys())
[docs] def setVisualization(self, mode):
"""Set the visualization mode of the data.
Supported visualization modes are:
- 'points': For scatter plot representation
- 'lines': For Delaunay tesselation-based wireframe representation
- 'solid': For Delaunay tesselation-based solid surface representation
:param str mode: Mode of representation to use
"""
mode = str(mode)
assert mode in self.supportedVisualizations()
if mode != self.getVisualization():
self._visualizationMode = mode
self._updateScene()
self._updated(ItemChangedType.VISUALIZATION_MODE)
[docs] def getVisualization(self):
"""Returns the current visualization mode.
See :meth:`setVisualization`
:rtype: str
"""
return self._visualizationMode
[docs] def isPropertyEnabled(self, name, visualization=None):
"""Returns true if the property is used with visualization mode.
:param str name: The name of the property to check, in:
'lineWidth', 'symbol', 'symbolSize'
:param str visualization:
The visualization mode for which to get the info.
By default, it is the current visualization mode.
:return:
"""
assert name in ('lineWidth', 'symbol', 'symbolSize')
if visualization is None:
visualization = self.getVisualization()
assert visualization in self.supportedVisualizations()
return name in self._VISUALIZATION_PROPERTIES[visualization]
[docs] def setHeightMap(self, heightMap):
"""Set whether to display the data has a height map or not.
When displayed as a height map, the data values are used as
z coordinates.
:param bool heightMap:
True to display a height map,
False to display as 2D data with z=0
"""
heightMap = bool(heightMap)
if heightMap != self.isHeightMap():
self._heightMap = heightMap
self._updateScene()
self._updated(Item3DChangedType.HEIGHT_MAP)
[docs] def isHeightMap(self):
"""Returns True if data is displayed as a height map.
:rtype: bool
"""
return self._heightMap
[docs] def getLineWidth(self):
"""Return the curve line width in pixels (float)"""
return self._lineWidth
[docs] def setLineWidth(self, width):
"""Set the width in pixel of the curve line
See :meth:`getLineWidth`.
:param float width: Width in pixels
"""
width = float(width)
assert width >= 1.
if width != self._lineWidth:
self._lineWidth = width
for child in self._getScenePrimitive().children:
if hasattr(child, 'lineWidth'):
child.lineWidth = width
self._updated(ItemChangedType.LINE_WIDTH)
[docs] def setData(self, x, y, value, copy=True):
"""Set the data represented by this item.
Provided arrays must have the same length.
:param numpy.ndarray x: X coordinates (array-like)
:param numpy.ndarray y: Y coordinates (array-like)
:param value: Points value: array-like or single scalar
:param bool copy:
True (default) to make a copy of the data,
False to avoid copy if possible (do not modify the arrays).
"""
x = numpy.array(
x, copy=copy, dtype=numpy.float32, order='C').reshape(-1)
y = numpy.array(
y, copy=copy, dtype=numpy.float32, order='C').reshape(-1)
assert len(x) == len(y)
if isinstance(value, collections.Iterable):
value = numpy.array(
value, copy=copy, dtype=numpy.float32, order='C').reshape(-1)
assert len(value) == len(x)
else: # Single scalar
value = numpy.array((float(value),), dtype=numpy.float32)
self._x = x
self._y = y
self._value = value
# Reset cache
self._cachedLinesIndices = None
self._cachedTrianglesIndices = None
# Store data range info
ColormapMixIn._setRangeFromData(self, self.getValues(copy=False))
self._updateScene()
self._updated(ItemChangedType.DATA)
[docs] def getData(self, copy=True):
"""Returns data as provided to :meth:`setData`.
:param bool copy: True to get a copy,
False to return internal data (do not modify!)
:return: (x, y, value)
"""
return (self.getXData(copy=copy),
self.getYData(copy=copy),
self.getValues(copy=copy))
[docs] def getXData(self, copy=True):
"""Returns X data coordinates.
:param bool copy: True to get a copy,
False to return internal array (do not modify!)
:return: X coordinates
:rtype: numpy.ndarray
"""
return numpy.array(self._x, copy=copy)
[docs] def getYData(self, copy=True):
"""Returns Y data coordinates.
:param bool copy: True to get a copy,
False to return internal array (do not modify!)
:return: Y coordinates
:rtype: numpy.ndarray
"""
return numpy.array(self._y, copy=copy)
[docs] def getValues(self, copy=True):
"""Returns data values.
:param bool copy: True to get a copy,
False to return internal array (do not modify!)
:return: data values
:rtype: numpy.ndarray
"""
return numpy.array(self._value, copy=copy)
def _updateScene(self):
self._getScenePrimitive().children = [] # Remove previous primitives
if not self.isVisible():
return # Update when visible
x, y, value = self.getData(copy=False)
if len(x) == 0:
return # Nothing to display
mode = self.getVisualization()
heightMap = self.isHeightMap()
if mode == 'points':
z = value if heightMap else 0.
symbol, size = self._getSceneSymbol()
primitive = primitives.Points(
x=x, y=y, z=z, value=value,
size=size,
colormap=self._getSceneColormap())
primitive.marker = symbol
else:
# TODO run delaunay in a thread
# Compute lines/triangles indices if not cached
if self._cachedTrianglesIndices is None:
coordinates = numpy.array((x, y)).T
if len(coordinates) > 3:
# Enough points to try a Delaunay tesselation
# Lazy loading of Delaunay
from silx.third_party.scipy_spatial import Delaunay as _Delaunay
try:
tri = _Delaunay(coordinates)
except RuntimeError:
_logger.error("Delaunay tesselation failed: %s",
sys.exc_info()[1])
return None
self._cachedTrianglesIndices = numpy.ravel(
tri.simplices.astype(numpy.uint32))
else:
# 3 or less points: Draw one triangle
self._cachedTrianglesIndices = \
numpy.arange(3, dtype=numpy.uint32) % len(coordinates)
if mode == 'lines' and self._cachedLinesIndices is None:
# Compute line indices
self._cachedLinesIndices = utils.triangleToLineIndices(
self._cachedTrianglesIndices, unicity=True)
if mode == 'lines':
indices = self._cachedLinesIndices
renderMode = 'lines'
else:
indices = self._cachedTrianglesIndices
renderMode = 'triangles'
# TODO supports x, y instead of copy
if heightMap:
if len(value) == 1:
value = numpy.ones_like(x) * value
coordinates = numpy.array((x, y, value), dtype=numpy.float32).T
else:
coordinates = numpy.array((x, y), dtype=numpy.float32).T
# TODO option to enable/disable light, cache normals
# TODO smooth surface
if mode == 'solid':
if heightMap:
coordinates = coordinates[indices]
if len(value) > 1:
value = value[indices]
triangleNormals = utils.trianglesNormal(coordinates)
normal = numpy.empty((len(triangleNormals) * 3, 3),
dtype=numpy.float32)
normal[0::3, :] = triangleNormals
normal[1::3, :] = triangleNormals
normal[2::3, :] = triangleNormals
indices = None
else:
normal = (0., 0., 1.)
else:
normal = None
primitive = primitives.ColormapMesh3D(
coordinates,
value.reshape(-1, 1), # Makes it a 2D array
normal=normal,
colormap=self._getSceneColormap(),
indices=indices,
mode=renderMode)
primitive.lineWidth = self.getLineWidth()
primitive.lineSmooth = False
self._getScenePrimitive().children = [primitive]
