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Interactive cropping #43

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Interactive cropping #43

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eef3fcd
Interactive cropping
AlexSauer May 15, 2024
3ea248c
Adjust z crop for position when cropping
AlexSauer May 17, 2024
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3 changes: 2 additions & 1 deletion docs/crop.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,8 @@
"id": "deec8f67-28d2-4823-9f0e-f98feb8c8f3c",
"metadata": {},
"source": [
"The widget contains 2 or 3 sliders, for 2D and 3D images respectively. It also supports `stackview`'s typical parameters such as `continuous_update`, `zoom_factor`, etc."
"The widget contains 2 or 3 sliders, for 2D and 3D images respectively. It also supports `stackview`'s typical parameters such as `continuous_update`, `zoom_factor`, etc.\n",
"The crop can either be selected via the sliders or with two mouse clicks (left click for top left corner, right lick for bottom right corner of the cropped rectangle)."
]
},
{
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41 changes: 41 additions & 0 deletions stackview/_crop.py
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Original file line number Diff line number Diff line change
Expand Up @@ -131,6 +131,47 @@ def __init__(self,
if len(image.shape) > 2:
widgets.append(slice_slider)

from ipyevents import Event

event_handler_top_left = Event(source=view, watched_events=["click"])
event_handler_bottom_right = Event(source=view, watched_events=["auxclick"])

def update_rec_top_left(event=None):
relative_position_x = event["relativeX"] / zoom_factor
relative_position_y = event["relativeY"] / zoom_factor
positions = [int(relative_position_y), int(relative_position_x)]

for i in [-1, -2]:
cmin, cmax = self._range_sliders[i].value
cvalue = positions[i] + cmin # Adjust position for current crop
self._range_sliders[i].value = (cvalue, cmax)

if len(self._image.shape) > 2:
cvalue = slice_slider.value
cmin, cmax = self._range_sliders[0].value
self._range_sliders[0].value = (cvalue, cmax)
self.update()

def update_rec_bottom_right(event=None):
relative_position_x = event["relativeX"] / zoom_factor
relative_position_y = event["relativeY"] / zoom_factor
positions = [int(relative_position_y), int(relative_position_x)]

for i in [-1, -2]:
cmin, cmax = self._range_sliders[i].value
cvalue = positions[i] + cmin # Adjust position for current crop
self._range_sliders[i].value = (cmin, cvalue)

if len(self._image.shape) > 2:
cvalue = slice_slider.value
cmin, cmax = self._range_sliders[0].value

self._range_sliders[0].value = (cmin, cvalue)
self.update()

event_handler_top_left.on_dom_event(update_rec_top_left)
event_handler_bottom_right.on_dom_event(update_rec_bottom_right)

super(_Cropper, self).__init__(widgets)

def update(self, event=None):
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