94 lines
2.8 KiB
Python
94 lines
2.8 KiB
Python
import io # Used in our capture action
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import time # Used in our timelapse function
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from flask import send_file # Used to send images from our server
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from labthings import (
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Schema,
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current_action,
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fields,
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find_component,
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update_action_progress,
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)
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from labthings.extensions import BaseExtension
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from labthings.views import ActionView, PropertyView, View
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# Used in our timelapse function
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from openflexure_microscope.captures.capture_manager import generate_basename
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## Extension methods
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def timelapse(microscope, n_images, t_between):
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"""
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Save a set of images in a timelapse
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Args:
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microscope: Microscope object
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n_images (int): Number of images to take
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t_between (int/float): Time, in seconds, between sequential captures
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"""
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base_file_name = generate_basename()
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folder = "TIMELAPSE_{}".format(base_file_name)
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# Take exclusive control over both the camera and stage
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with microscope.camera.lock, microscope.stage.lock:
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for n in range(n_images):
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# Elegantly handle action cancellation
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if current_action() and current_action().stopped:
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return
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# Generate a filename
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filename = f"{base_file_name}_image{n}"
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# Create a file to save the image to
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output = microscope.camera.new_image(
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filename=filename, folder=folder, temporary=False
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)
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# Capture
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microscope.camera.capture(output)
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# Add system metadata
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output.put_metadata(microscope.metadata, system=True)
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# Update task progress (only does anyting if the function is running in a LabThings task)
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progress_pct = ((n + 1) / n_images) * 100 # Progress, in percent
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update_action_progress(progress_pct)
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# Wait for the specified time
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time.sleep(t_between)
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## Extension views
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class TimelapseAPI(ActionView):
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"""
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Take a series of images in a timelapse
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"""
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args = {
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"n_images": fields.Integer(
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required=True, example=5, description="Number of images"
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),
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"t_between": fields.Number(
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missing=1, example=1, description="Time (seconds) between images"
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),
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}
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def post(self, args):
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# Find our microscope component
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microscope = find_component("org.openflexure.microscope")
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# Start "timelapse"
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return timelapse(microscope, args.get("n_images"), args.get("t_between"))
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## Create extension
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# Create your extension object
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my_extension = BaseExtension("com.myname.timelapse-extension", version="0.0.0")
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# Add methods to your extension
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my_extension.add_method(timelapse, "timelapse")
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# Add API views to your extension
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my_extension.add_view(TimelapseAPI, "/timelapse")
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