def _add_roi(project_id, stack_id, user_id, x_min, x_max, y_min, y_max, z,
zoom_level, rotation_cw):
""" Add a new ROI database object and return it.
"""
# Calculate ROI center and extent
cx = (x_max + x_min) * 0.5
cy = (y_max + y_min) * 0.5
cz = z
width = abs(x_max - x_min)
height = abs(y_max - y_min)
# Create a new ROI class instance
roi = RegionOfInterest()
roi.user_id = user_id
roi.editor_id = user_id
roi.project_id = project_id
roi.stack_id = stack_id
roi.zoom_level = zoom_level
roi.location_x = cx
roi.location_y = cy
roi.location_z = cz
roi.width = width
roi.height = height
roi.rotation_cw = rotation_cw
roi.save()
# Create cropped image, if wanted
if settings.ROI_AUTO_CREATE_IMAGE:
file_name, file_path = create_roi_path(roi.id)
create_roi_image(request.user, project_id, roi.id, file_path)
return roi
def link_roi_to_class_instance(request, project_id=None, relation_id=None,
stack_id=None, ci_id=None):
""" With the help of this method one can link a region of interest
(ROI) to a class instance. The information about the ROI is passed
as POST variables.
"""
# Try to get all needed POST parameters
x_min = float(request.POST['x_min'])
x_max = float(request.POST['x_max'])
y_min = float(request.POST['y_min'])
y_max = float(request.POST['y_max'])
z = float(request.POST['z'])
zoom_level = int(request.POST['zoom_level'])
rotation_cw = int(request.POST['rotation_cw'])
# Get related objects
project = Project.objects.get(id=project_id)
stack = Stack.objects.get(id=stack_id)
ci = ClassInstance.objects.get(id=ci_id)
rel = Relation.objects.get(id=relation_id)
# Calculate ROI center and extent
cx = (x_max + x_min) * 0.5
cy = (y_max + y_min) * 0.5
cz = z
width = abs(x_max - x_min)
height = abs(y_max - y_min)
# Create a new ROI class instance
roi = RegionOfInterest()
roi.user = request.user
roi.editor = request.user
roi.project = project
roi.stack = stack
roi.zoom_level = zoom_level
roi.location = Double3D(cx, cy, cz)
roi.width = width
roi.height = height
roi.rotation_cw = rotation_cw
roi.save()
# Link ROI and class instance
roi_ci = RegionOfInterestClassInstance()
roi_ci.user = request.user
roi_ci.project = project
roi_ci.relation = rel
roi_ci.region_of_interest = roi
roi_ci.class_instance = ci
roi_ci.save()
# Create cropped image, if wanted
if settings.ROI_AUTO_CREATE_IMAGE:
file_name, file_path = create_roi_path(roi.id)
create_roi_image(request.user, project_id, roi.id, file_path)
# Build result data set
status = {'status': "Created new ROI with ID %s." % roi.id}
return HttpResponse(json.dumps(status))