#!/usr/bin/env python
# -*- coding: iso-8859-15 -*-
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#
# Copyright 2006 - Juan José Conti <jjconti@gnu.org>
# Copyleft :-)

from math import *
from gimpfu import *

def gen_constellation(bg_colour, stars_colour, circles_colour, axis_colour, power):

	img_width = img_height = 350
	n = int(pow(2,power))
	diam = img_width * 0.8
	rad = diam / 2
	X_BASE = Y_BASE = img_width / 2
	
	img = pdb.gimp_image_new(img_width, img_height, RGB)
	layer = pdb.gimp_layer_new(img, img_width, img_height, RGB_IMAGE, "Starts", 100, NORMAL_MODE)
	pdb.gimp_image_add_layer(img,layer,0)

	pdb.gimp_context_set_background(bg_colour)
	pdb.gimp_drawable_fill(layer,BACKGROUND_FILL)

	pdb.gimp_context_set_foreground(circles_colour)
	draw_circle(img, layer, X_BASE, Y_BASE, rad)

	pdb.gimp_context_set_foreground(axis_colour)
	draw_axis(img, layer, img_width, img_height)

	pdb.gimp_context_set_foreground(stars_colour)
	draw_constellation(img, layer, n, rad, X_BASE, Y_BASE)
	float_text = set_text(img, layer, 275, 310, str(n)+"-PSK")
	pdb.gimp_floating_sel_anchor(float_text)
		
	pdb.gimp_selection_none(img)
	pdb.gimp_display_new(img)
		

def draw_constellation(img, layer, n, rad, X_BASE, Y_BASE):

	arc = (2*pi)/n
	arc_sum = arc
	i = 1
	
	while(i <= n):
		x_offset = sin(arc_sum) * rad
		y_offset = cos(arc_sum) * rad

		draw_star(img, layer, X_BASE + x_offset, Y_BASE + y_offset)
		
		i += 1
		arc_sum += arc


def draw_star(img, layer, x, y):
	
	size = 12
	x_top_left = x - size/2
	y_top_left = y - size/2

	pdb.gimp_ellipse_select(img, x_top_left, y_top_left, size, size, CHANNEL_OP_ADD, False, 0, 0)
	pdb.gimp_edit_bucket_fill(layer, FG_BUCKET_FILL, NORMAL_MODE,100, 0, 0, 0, 0) 
	pdb.gimp_selection_none(img)


def set_text(img, layer, x, y, text):
	# last parameter, font name, must be installed in the system 
	return pdb.gimp_text_fontname(img, layer, x, y, text, 1, False, 16, PIXELS,"URW Gothic L")


def draw_circle(img, layer, x_center, y_center, rad):
	
	width = 2 # line width in pixels
	rad = rad + width/2.
	x_top_left = x_center - rad
	y_top_left = y_center - rad
	
	
	pdb.gimp_ellipse_select(img, x_top_left, y_top_left, 2*rad, 2*rad, CHANNEL_OP_ADD, False, 0, 0)
	# when gimp stable relase suport defining stroke preferences this function
	# will looks nicer
	# pdb.gimp_edit_stroke(layer)
	# meanwhile..
	pdb.gimp_edit_bucket_fill(layer, FG_BUCKET_FILL, NORMAL_MODE,100, 0, 0, 0, 0) 
	pdb.gimp_selection_none(img)
	rad = rad - width
	x_top_left = x_center - rad
	y_top_left = y_center - rad
	pdb.gimp_ellipse_select(img, x_top_left, y_top_left, 2*rad, 2*rad, CHANNEL_OP_ADD, False, 0, 0)
	pdb.gimp_edit_bucket_fill(layer, BG_BUCKET_FILL, NORMAL_MODE,100, 0, 0, 0, 0) 
	pdb.gimp_selection_none(img)


def draw_axis(img, layer, total_width, total_height):
	
	width = 3 # line width in pixels
	x_center = total_width / 2.
	y_center = total_height / 2.
	
	# y axis
	x_top_left = x_center - width/2.
	y_top_left = 0
	pdb.gimp_rect_select(img, x_top_left, y_top_left, width, total_height, CHANNEL_OP_ADD, 0, 0)

	# x axis
	x_top_left = 0
	y_top_left = y_center - width/2.
	pdb.gimp_rect_select(img, x_top_left, y_top_left, total_width, width, CHANNEL_OP_ADD, 0, 0)

	pdb.gimp_edit_bucket_fill(layer, FG_BUCKET_FILL, NORMAL_MODE,100, 0, 0, 0, 0) 
	pdb.gimp_selection_none(img)
	

register(
	"gen_constellation",
	"Generate a PSK modulation constelation",
	"Generate a PSK modulation constelation",
	"Juanjo Conti",
	"Juanjo Conti",
	"2006",
	"<Toolbox>/Xtns/Python-Fu/Constellations/PSK",
	"",
	[
		(PF_COLOR, "bg_colour", "Color de fondo:", (255,255,255)),
		(PF_COLOR, "stars_colour", "Color de las estrellas:", (0,0,0)),
		(PF_COLOR, "circles_colour", "Color de las circunferencias:", (216,255,255)),
		(PF_COLOR, "axis_colour", "Color de los ejes de coordenadas:", (232,232,232)),
        (PF_SPINNER, "power", "El número de estrellas en la constelación es 2^:", 3, (1,6,1))
	],
	[],
	gen_constellation)

main()