116 lines
3.3 KiB
Python
116 lines
3.3 KiB
Python
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from ...util.dtype import dtype_range
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from .base import Plugin
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from ..utils import ClearColormap, update_axes_image
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from ..._shared.version_requirements import is_installed
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__all__ = ['OverlayPlugin']
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class OverlayPlugin(Plugin):
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"""Plugin for ImageViewer that displays an overlay on top of main image.
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The base Plugin class displays the filtered image directly on the viewer.
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OverlayPlugin will instead overlay an image with a transparent colormap.
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See base Plugin class for additional details.
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Attributes
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----------
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overlay : array
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Overlay displayed on top of image. This overlay defaults to a color map
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with alpha values varying linearly from 0 to 1.
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color : int
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Color of overlay.
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"""
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colors = {'red': (1, 0, 0),
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'yellow': (1, 1, 0),
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'green': (0, 1, 0),
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'cyan': (0, 1, 1)}
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def __init__(self, **kwargs):
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super(OverlayPlugin, self).__init__(**kwargs)
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self._overlay_plot = None
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self._overlay = None
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self.cmap = None
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self.color_names = sorted(list(self.colors.keys()))
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def attach(self, image_viewer):
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super(OverlayPlugin, self).attach(image_viewer)
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#TODO: `color` doesn't update GUI widget when set manually.
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self.color = 0
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@property
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def overlay(self):
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return self._overlay
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@overlay.setter
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def overlay(self, image):
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self._overlay = image
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ax = self.image_viewer.ax
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if image is None:
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ax.images.remove(self._overlay_plot)
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self._overlay_plot = None
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elif self._overlay_plot is None:
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vmin, vmax = dtype_range[image.dtype.type]
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self._overlay_plot = ax.imshow(image, cmap=self.cmap,
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vmin=vmin, vmax=vmax)
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else:
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update_axes_image(self._overlay_plot, image)
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if self.image_viewer.useblit:
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self.image_viewer._blit_manager.background = None
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self.image_viewer.redraw()
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@property
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def color(self):
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return self._color
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@color.setter
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def color(self, index):
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# Update colormap whenever color is changed.
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if isinstance(index, str) and \
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index not in self.color_names:
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raise ValueError("%s not defined in OverlayPlugin.colors" % index)
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else:
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name = self.color_names[index]
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self._color = name
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rgb = self.colors[name]
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self.cmap = ClearColormap(rgb)
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if self._overlay_plot is not None:
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self._overlay_plot.set_cmap(self.cmap)
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self.image_viewer.redraw()
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@property
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def filtered_image(self):
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"""Return filtered image.
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This "filtered image" is used when saving from the plugin.
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"""
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return self.overlay
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def display_filtered_image(self, image):
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"""Display filtered image as an overlay on top of image in viewer."""
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self.overlay = image
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def closeEvent(self, event):
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# clear overlay from ImageViewer on close
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self.overlay = None
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super(OverlayPlugin, self).closeEvent(event)
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def output(self):
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"""Return the overlaid image.
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Returns
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-------
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overlay : array, same shape as image
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The overlay currently displayed.
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data : None
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"""
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return (self.overlay, None)
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