# vim: set fileencoding=utf-8 :

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# * also a registered trademark of Insecure.Com LLC.  This program is free  *
# * software; you may redistribute and/or modify it under the terms of the  *
# * GNU General Public License as published by the Free Software            *
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# * modify, and redistribute this software under certain conditions.  If    *
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# * vendors already license Nmap technology such as host discovery, port    *
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# * Engine.                                                                 *
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# * yet it does not provide a detailed definition of that term.  To avoid   *
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# * derivative work for the purpose of this license if it does any of the   *
# * following with any software or content covered by this license          *
# * ("Covered Software"):                                                   *
# *                                                                         *
# * o Integrates source code from Covered Software.                         *
# *                                                                         *
# * o Reads or includes copyrighted data files, such as Nmap's nmap-os-db   *
# * or nmap-service-probes.                                                 *
# *                                                                         *
# * o Is designed specifically to execute Covered Software and parse the    *
# * results (as opposed to typical shell or execution-menu apps, which will *
# * execute anything you tell them to).                                     *
# *                                                                         *
# * o Includes Covered Software in a proprietary executable installer.  The *
# * installers produced by InstallShield are an example of this.  Including *
# * Nmap with other software in compressed or archival form does not        *
# * trigger this provision, provided appropriate open source decompression  *
# * or de-archiving software is widely available for no charge.  For the    *
# * purposes of this license, an installer is considered to include Covered *
# * Software even if it actually retrieves a copy of Covered Software from  *
# * another source during runtime (such as by downloading it from the       *
# * Internet).                                                              *
# *                                                                         *
# * o Links (statically or dynamically) to a library which does any of the  *
# * above.                                                                  *
# *                                                                         *
# * o Executes a helper program, module, or script to do any of the above.  *
# *                                                                         *
# * This list is not exclusive, but is meant to clarify our interpretation  *
# * of derived works with some common examples.  Other people may interpret *
# * the plain GPL differently, so we consider this a special exception to   *
# * the GPL that we apply to Covered Software.  Works which meet any of     *
# * these conditions must conform to all of the terms of this license,      *
# * particularly including the GPL Section 3 requirements of providing      *
# * source code and allowing free redistribution of the work as a whole.    *
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# * OpenSSL library which is distributed under a license identical to that  *
# * listed in the included docs/licenses/OpenSSL.txt file, and distribute   *
# * linked combinations including the two.                                  *
# *                                                                         *
# * Any redistribution of Covered Software, including any derived works,    *
# * must obey and carry forward all of the terms of this license, including *
# * obeying all GPL rules and restrictions.  For example, source code of    *
# * the whole work must be provided and free redistribution must be         *
# * allowed.  All GPL references to "this License", are to be treated as    *
# * including the terms and conditions of this license text as well.        *
# *                                                                         *
# * Because this license imposes special exceptions to the GPL, Covered     *
# * Work may not be combined (even as part of a larger work) with plain GPL *
# * software.  The terms, conditions, and exceptions of this license must   *
# * be included as well.  This license is incompatible with some other open *
# * source licenses as well.  In some cases we can relicense portions of    *
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# * software.  Please contact fyodor@nmap.org with any such requests.       *
# * Similarly, we don't incorporate incompatible open source software into  *
# * Covered Software without special permission from the copyright holders. *
# *                                                                         *
# * If you have any questions about the licensing restrictions on using     *
# * Nmap in other works, are happy to help.  As mentioned above, we also    *
# * offer alternative license to integrate Nmap into proprietary            *
# * applications and appliances.  These contracts have been sold to dozens  *
# * of software vendors, and generally include a perpetual license as well  *
# * as providing for priority support and updates.  They also fund the      *
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# * information.                                                            *
# *                                                                         *
# * If you have received a written license agreement or contract for        *
# * Covered Software stating terms other than these, you may choose to use  *
# * and redistribute Covered Software under those terms instead of these.   *
# *                                                                         *
# * Source is provided to this software because we believe users have a     *
# * right to know exactly what a program is going to do before they run it. *
# * This also allows you to audit the software for security holes.          *
# *                                                                         *
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# * because the inability to relicense code has caused devastating problems *
# * for other Free Software projects (such as KDE and NASM).  We also       *
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# ***************************************************************************/


class Linear2DInterpolator:
    """
    Implements a bidimensional linear interpolator.
    """

    def __init__(self):
        """
        Constructor method of Linear2DInterpolator class
        """
        self.__start_point = (0, 0)
        """Initial point of interpolation"""
        self.__final_point = (0, 0)
        """Final point of interpolation"""
        self.__interpolated_points = []
        """Interpolated points vector"""

    def set_start_point(self, a, b):
        """
        Set initial coordinate
        Set final coordinate
        @type  a: number
        @param a: The first component of final point
        @type  b: number
        @param b: The second component of final point
        """
        self.__start_point = (a, b)

    def set_final_point(self, a, b):
        """
        Set final coordinate
        @type  a: number
        @param a: The first component of final point
        @type  b: number
        @param b: The second component of final point
        """
        self.__final_point = (a, b)

    def get_weighed_points(self, number_of_pass, pass_vector):
        """
        Return the vector of coordinates between the initial and final
        coordinates with the specified size
        @type  number_of_pass: number
        @param number_of_pass: The number of pass of interpolation
        @rtype: list
        @return: A list of tuples with interpolated points
        """
        (ai, bi) = self.__start_point
        (af, bf) = self.__final_point

        a_conversion_factor = float(af - ai) / sum(pass_vector)
        b_conversion_factor = float(bf - bi) / sum(pass_vector)

        a_pass = 0
        b_pass = 0

        self.__interpolated_points = range(number_of_pass)

        for i in range(0, number_of_pass):

            a_pass += pass_vector[i] * a_conversion_factor
            b_pass += pass_vector[i] * b_conversion_factor
            self.__interpolated_points[i] = (ai + a_pass, bi + b_pass)

        return self.__interpolated_points

    def get_points(self, number_of_pass):
        """
        Return the vector of coordinates between the initial and final
        coordinates with the specified size
        @type  number_of_pass: number
        @param number_of_pass: The number of pass of interpolation
        @rtype: list
        @return: A list of tuples with interpolated points
        """
        (ai, bi) = self.__start_point
        (af, bf) = self.__final_point

        a_pass = float(af - ai) / number_of_pass
        b_pass = float(bf - bi) / number_of_pass

        self.__interpolated_points = range(number_of_pass)

        for i in range(1, number_of_pass + 1):
            self.__interpolated_points[i - 1] = (ai + a_pass * i,
                                                 bi + b_pass * i)

        return self.__interpolated_points


if __name__ == "__main__":

    # Testing application

    i = Linear2DInterpolator()

    i.set_start_point(0, 0)
    i.set_final_point(1, 1)

    print len(i.get_points(10)), i.get_points(10)