/usr/lib/python2.7/dist-packages/chaco/base_2d_plot.py is in python-chaco 4.5.0-1.
This file is owned by root:root, with mode 0o644.
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"""
# Standard library imports
from numpy import asarray, isnan
# Enthought library imports.
from traits.api import Enum, Event, Instance, Property, Range, Trait
# Local relative imports
from abstract_plot_renderer import AbstractPlotRenderer
from base import reverse_map_1d
from plot_label import PlotLabel
from grid_data_source import GridDataSource
from grid_mapper import GridMapper
from image_data import ImageData
class Base2DPlot(AbstractPlotRenderer):
""" Base class for 2-D plots.
"""
#------------------------------------------------------------------------
# Data-related traits
#------------------------------------------------------------------------
# The data source to use for the index coordinate.
index = Instance(GridDataSource)
# The data source to use as value points.
value = Instance(ImageData)
# Screen mapper for 2-D structured (gridded) index data.
index_mapper = Instance(GridMapper)
# Convenience property for accessing the data range of the mapper.
index_range = Property
# Convenience property for accessing the plots labels.
labels = Property
# The direction that the first array returned by self.index.get_data()
# maps to.
#
# * 'h': index maps to x-direction
# * 'v': index maps to y-direction
orientation = Enum("h", "v")
# Overrides PlotComponent; 2-D plots draw on the 'image' layer,
# underneath all decorations and annotations, and above only the background
# fill color.
draw_layer = "image"
# Convenience property for accessing the x-direction mappers regardless
# of orientation. This provides compatibility with a number of tools.
x_mapper = Property
# Convenience property for accessing the y-direction mappers regardless
# of orientation. This provides compatibility with a number of tools.
y_mapper = Property
# Overall alpha value of the image. Ranges from 0.0 for transparent to 1.0
# for full intensity.
alpha = Trait(1.0, Range(0.0, 1.0))
# Event fired when the index data changes. Subclasses can listen for this
# event and take appropriate steps (except for requesting a redraw, which
# is done in this class).
index_data_changed = Event
# Event fired when the index mapper changes. Subclasses can listen for this
# event and take appropriate steps (except for requesting a redraw, which
# is done in this class).
index_mapper_changed = Event
# Event fired when the value data changes. Subclasses can listen for this
# event and take appropriate steps (except for requesting a redraw, which
# is done in this class).
value_data_changed = Event
#------------------------------------------------------------------------
# Public methods
#------------------------------------------------------------------------
def __init__(self, **kwargs):
# Handling the setting/initialization of these traits manually because
# they should be initialized in a certain order.
kwargs_tmp = {"trait_change_notify": False}
for trait_name in ("index", "value"):
if trait_name in kwargs:
kwargs_tmp[trait_name] = kwargs.pop(trait_name)
self.set(**kwargs_tmp)
super(Base2DPlot, self).__init__(**kwargs)
if self.index is not None:
self.index.on_trait_change(self._update_index_data,
"data_changed")
if self.index_mapper:
self.index_mapper.on_trait_change(self._update_index_mapper,
"updated")
if self.value is not None:
self.value.on_trait_change(self._update_value_data,
"data_changed")
# If we are not resizable, we will not get a bounds update upon layout,
# so we have to manually update our mappers
if self.resizable == "":
self._update_mappers()
return
#------------------------------------------------------------------------
# AbstractPlotRenderer interface
#------------------------------------------------------------------------
def map_screen(self, data_pts):
""" Maps an array of data points into screen space and returns it as
an array.
Implements the AbstractPlotRenderer interface.
"""
# data_pts is Nx2 array
if len(data_pts) == 0:
return []
return asarray(self.index_mapper.map_screen(data_pts))
def map_data(self, screen_pts):
""" Maps a screen space point into the "index" space of the plot.
Implements the AbstractPlotRenderer interface.
"""
return self.index_mapper.map_data(screen_pts)
def map_index(self, screen_pt, threshold=2.0,
outside_returns_none=True, index_only=False):
""" Maps a screen space point to an index into the plot's index arrays.
Implements the AbstractPlotRenderer interface.
The *index_only* parameter is ignored because the index is
intrinsically 2-D.
"""
if self.orientation == 'h':
x_pt,y_pt = self.map_data([screen_pt])[0]
else:
x_pt,y_pt = self.map_data([(screen_pt[1],screen_pt[0])])[0]
if ((x_pt < self.index_mapper.range.low[0]) or
(x_pt > self.index_mapper.range.high[0]) or
(y_pt < self.index_mapper.range.low[1]) or
(y_pt > self.index_mapper.range.high[1])) and outside_returns_none:
return None, None
x_index_data, y_index_data = self.index.get_data()
if x_index_data.get_size() == 0 or y_index_data.get_size() == 0:
return None, None
# attempt to map to the x index
x_data = x_index_data.get_data()
y_data = y_index_data.get_data()
try:
x_ndx = reverse_map_1d(x_data, x_pt, self.index.sort_order[0],
floor_only=True)
except IndexError, e:
if outside_returns_none:
return None, None
# x index
if x_pt < x_data[0]:
x_ndx = 0
else:
x_ndx = len(x_data) - 1
try:
y_ndx = reverse_map_1d(y_data, y_pt, self.index.sort_order[1],
floor_only=True)
except IndexError, e:
if outside_returns_none:
return None, None
# y index
if y_pt < y_data[0]:
y_ndx = 0
else:
y_ndx = len(y_data) - 1
if threshold == 0:
return x_ndx, y_ndx
x = x_data[x_ndx]
y = y_data[y_ndx]
if isnan(x) or isnan(y):
return None, None
sx, sy = self.map_screen([(x,y)])[0]
if ((screen_pt[0]-sx)**2 + (screen_pt[1]-sy)**2 < threshold**2):
return x_ndx, y_ndx
else:
return None, None
#------------------------------------------------------------------------
# PlotComponent interface
#------------------------------------------------------------------------
def _draw_image(self, gc, view_bounds=None, mode="normal"):
""" Handler for drawing the 'image' layer.
Used by the PlotComponent interface.
"""
self._render(gc)
return
#------------------------------------------------------------------------
# Abstract methods that subclasses must implement
#------------------------------------------------------------------------
def _render(self, gc, points):
""" Abstract method for drawing the plot.
"""
raise NotImplementedError
#------------------------------------------------------------------------
# Properties
#------------------------------------------------------------------------
def _get_index_range(self):
return self.index_mapper.range
def _set_index_range(self, val):
self.index_mapper.range = val
def _get_labels(self):
labels = []
for obj in self.underlays+self.overlays:
if isinstance(obj, PlotLabel):
labels.append(obj)
return labels
def _get_x_mapper(self):
if self.orientation == 'h':
return self.index_mapper._xmapper
else:
return self.index_mapper._ymapper
def _get_y_mapper(self):
if self.orientation == 'h':
return self.index_mapper._ymapper
else:
return self.index_mapper._xmapper
#------------------------------------------------------------------------
# Private methods
#------------------------------------------------------------------------
def _update_index_mapper(self):
""" Updates the index mapper.
Called by various trait change handlers.
"""
x = self.x
x2 = self.x2
y = self.y
y2 = self.y2
if "left" in self.origin:
x_low = x
x_high = x2
else:
x_low = x2
x_high = x
if "bottom" in self.origin:
y_low = y
y_high = y2
else:
y_low = y2
y_high = y
if self.index_mapper is not None:
if self.orientation == 'h':
self.index_mapper.screen_bounds = (x_low, x_high, y_low, y_high)
else:
self.index_mapper.screen_bounds = (y_low, y_high, x_low, x_high)
self.index_mapper_changed = True
self.invalidate_draw()
def _update_index_data(self):
""" Updates the index data.
Called by various trait change handlers.
"""
self.index_data_changed = True
self.invalidate_draw()
def _update_value_data(self):
""" Updates the value data.
Called by various trait change handlers.
"""
self.value_data_changed = True
self.invalidate_draw()
#------------------------------------------------------------------------
# Event handlers
#------------------------------------------------------------------------
def _bounds_changed(self, old, new):
super(Base2DPlot, self)._bounds_changed(old, new)
self._update_index_mapper()
def _bounds_items_changed(self, event):
super(Base2DPlot, self)._bounds_items_changed(event)
self._update_index_mapper()
def _orientation_changed(self):
self._update_index_mapper()
def _origin_changed(self):
self._update_index_mapper()
def _index_changed(self, old, new):
if old is not None:
old.on_trait_change(self._update_index_data,
"data_changed", remove=True)
if new is not None:
new.on_trait_change(self._update_index_data, "data_changed")
self._update_index_data()
def _value_changed(self, old, new):
if old is not None:
old.on_trait_change(self._update_value_data,
"data_changed", remove=True)
if new is not None:
new.on_trait_change(self._update_value_data, "data_changed")
self._update_value_data()
def _index_mapper_changed(self, old, new):
if old is not None:
old.on_trait_change(self._update_index_mapper,
"updated", remove=True)
if new is not None:
new.on_trait_change(self._update_index_mapper, "updated")
self._update_index_mapper()
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