def insert_layer(self, index, image, colormap=None, opacity=1.0):
""" Insert a new layer at specified position. The colormap defaults to
a gray colormap. If the colormap's display range is None, it
defaults to the image range.
"""
if colormap is None:
colormap = Colormap(colormaps["gray"], None, False, False, False)
if colormap.display_range is None:
colormap.display_range = (image.data.min(), image.data.max())
# Find out which layer class we will use
LayerClass = Layer.get_derived_class(image)
if LayerClass is None:
raise medipy.base.Exception("Cannot create layer")
# Create the layer and insert it
if self._layers and index == 0:
self._layers[0].remove_observer("colormap",
self._on_layer_colormap)
layer = LayerClass(self.world_to_slice, image,
self.display_coordinates, colormap, opacity)
self._layers.insert(index, layer)
# Update the physical extent
self._compute_extent()
# The scalar bar will always reflect layer 0
if index == 0:
self._on_layer_colormap(None)
self._layers[0].add_observer("colormap", self._on_layer_colormap)
# Adjust layer w.r.t. the current state.
self._update_layers_positions()
if self._cursor_physical_position is not None:
layer.physical_position = self._cursor_physical_position
# if isinstance(layer, ImageLayer) :
# layer.actor.SetInterpolate(self._interpolation)
# And finally add it to the renderer
self._renderer.AddActor(layer.actor)
