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Jython Scripting

6,450 bytes added, 10:02, 30 August 2016
Image selection using the GenericDialog class: adding the source code and a list of links to useful documentation
=== Image selection using the GenericDialog class ===
coming soonThis example script will create up to 10 new images and create a GenericDialog to select 3 of them.Finally the names of the selected images are printed to the Log window.It is recommended to copy the code to the [[Using_the_Script_Editor|Script Editor]] and run it by yourselfThe following list links to documentation of the used Python features:* [ Future statement definitions]* [ Built-in Functions]* [ str.join()-method]* [ List Comprehensions]* [ Generator Expressions]* [ ** (double star) and * (star) parameters]* [ Top-level script environment (__main__)]* [ Purpose of the single underscore “_” variable]  <source lang='python'># The module __future__ contains some useful functions:# __future__ import with_statement, division# This imports the function random from the module random.from random import random# Next we import Java Classes into Jython.# This is how we can acces the ImageJ API:# ij import IJ, WindowManagerfrom ij.gui import GenericDialog # A function is created with the def keyword.# This function does not need any parameters.def create_test_image(): # Python uses indentation to create code blocks  # Local variables are assigned. # We can assign the same value to more than one variable. image_width = image_height = 512 box_width = box_height = 128 offset_x = offset_y = 192 counts = 64 stdv = 16 # The build in function int() is used to convert float to int. # The variable random contains a function that is called by adding parentheses. offset_x = int(2 * random() * offset_x) offset_y = int(2 * random() * offset_y) # We can define a function inside a function. # Outside of create_test_image() this function is not available. # By adding an asterisk to a parameter, all given parameters are combined to a tuple. def make_title(*to_concat): prefix = 'TestImage' # To create a tuple with a single entry the comma is necessary. # The 2 tuples are concatenated by using the + operator. to_join = (prefix,) + to_concat # We create a generator that converts every singe entry of the tuple to a string. strings_to_join = (str(arg) for arg in to_join) # The string ',' has a join method to concatenate values of a tuple with the string as seperator. # The result is a string. return ','.join(strings_to_join) def check_existence(title): if WindowManager.getIDList() is None: return False image_titles = (WindowManager.getImage(id).getTitle() for id in WindowManager.getIDList()) return title in image_titles # To negate an expression put not in front of it. if not check_existence(make_title(offset_x, offset_y)): # The following code has been created by using the Recorder of ImageJ, set to output Java code. # By removing the semicolons, the code can be used in Jython. # The parameters can be modified by using variables and string concatenation. imp = IJ.createImage(make_title(offset_x, offset_y), "8-bit black", image_width, image_height, 1) # The build in function str() is used to convert int to string., "Add...", "value=" + str(counts)) imp.setRoi(offset_x , offset_y, box_width, box_height), "Add...", "value=" + str(counts)), "Select None", ""), "Add Specified Noise...", "standard=" + str(stdv)); # We don't want to confirm when closing one of the newly created images. imp.changes = False # This function uses parameters.# A default value is given to the third parameter.def create_selection_dialog(image_titles, defaults, title='Select images for processing'): gd = GenericDialog(title) # The build in function enumerate() returns two values: # The index and the value stored in the tuple/list. for index, default in enumerate(defaults): # for each loop we add a new choice element to the dialog. gd.addChoice('Image_'+ str(index + 1), image_titles, image_titles[default]) gd.showDialog() if gd.wasCanceled(): return None # This function returns a list. # _ is used as a placeholder for values we don't use. # The for loop is used to call gd.getNextChoiceIndex() len(defaults) times. return [gd.getNextChoiceIndex() for _ in defaults] # It's best practice to create a function that contains the code that is executed when running the script.# This enables us to stop the script by just calling return.def run_script(): while WindowManager.getImageCount() < 10: create_test_image() image_titles = [WindowManager.getImage(id).getTitle() for id in WindowManager.getIDList()] # range(3) will create the list [0, 1, 2]. selected_indices = create_selection_dialog(image_titles, range(3)) # The script stops if the dialog has ben canceld (None was returned from create_selection_dialog). if selected_indices is None: print('Script was canceld.') return # We have to get the corresponding IMagePlus objects. selected_imps = [WindowManager.getImage(id) for id in [WindowManager.getIDList()[index] for index in selected_indices]] # The previous line can be split into 2 lines: # selected_ids = [WindowManager.getIDList()[index] for index in selected_indices] # selected_imps = [WindowManager.getImage(id) for id in selected_ids] for imp in selected_imps: # Strings can be formated using the % operator: # IJ.log('The image \'%s\' has been selected.' % imp.getTitle()) # If a Jython script is run, the variable __name__ contains the string '__main__'.# If a script is loaded as module, __name__ has a different value.if __name__ == '__main__': run_script()</source>
=== Using ImageJ-Ops ===