layercalc.py

#!/usr/bin/env python3
# -*- coding: utf-8; mode: python -*-

"""
Return relative coordinates of a rectangle for insertion in hyperimage.
"""

__version__ = "1.0"
__date__ = "20191218"
__author__ = "kthoden@mpiwg-berlin.mpg.de"

import argparse
import logging
from PIL import Image

logging.basicConfig(level=logging.DEBUG, format=' %(asctime)s - %(levelname)s - %(message)s')


def get_image_size(imagefile):
    """Get image size of image. Return tuple of width and height"""

    image_object = Image.open(imagefile)
    width, height = image_object.size

    return width, height
# def get_image_size ends here


def calculate_coordinate(relative, absolute):
    """Calculate relative coordinate"""

    fraction = relative / absolute

    return fraction
# def calculate_coordinate ends here


def get_relative_coordinates(width, height, x0, y0, x1, y1):
    """Assemble the list of relative coordinates."""

    list_of_points = []
    topleft = [calculate_coordinate(x0, width), calculate_coordinate(y0, height)]
    topright = [calculate_coordinate(x1, width), calculate_coordinate(y0, height)]
    bottomleft = [calculate_coordinate(x1, width), calculate_coordinate(y1, height)]
    bottomright = [calculate_coordinate(x0, width), calculate_coordinate(y1, height)]
    list_of_points.append(topleft)
    list_of_points.append(topright)
    list_of_points.append(bottomleft)
    list_of_points.append(bottomright)

    return list_of_points
# def get_relative_coordinates ends here


def main():
    """The main bit"""

    parser = argparse.ArgumentParser()
    parser.add_argument("image", help="The image on which the layer is supposed to sit.")
    parser.add_argument("topleft", help="Absolute coordinates of top left corner, insert as x,y")
    parser.add_argument("bottomright", help="Absolute coordinates of bottom right corner, insert as x,y")
    args = parser.parse_args()

    width, height = get_image_size(args.image)

    topleft_width, topleft_height = args.topleft.split(",")
    bottomright_width, bottomright_height = args.bottomright.split(",")

    points = get_relative_coordinates(int(width), int(height), int(topleft_width), int(topleft_height), int(bottomright_width), int(bottomright_height))
    print(points)
# def main ends here

if __name__ == '__main__':
    main()
# finis