# -*- coding: utf-8 -*-

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

# gtk imports
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk, GObject, GLib

# math/plot imports
from matplotlib.backends.backend_gtk3agg import (
    FigureCanvasGTK3Agg as FigureCanvas)
from matplotlib.figure import Figure
import numpy as np
import math
import sys

class spirographs:
    def __init__(self):
        self.bigRadius = 12
        self.smallRadius = 5
        self.distance = 4
        self.highestTheta = (np.lcm(self.smallRadius, self.bigRadius)/self.bigRadius) * 2 * math.pi
        self.stepSize = self.highestTheta / 4096
        # update initial slider positions
        bigRadiusAdjustment = builder.get_object('bigRadiusAdjustment')
        smallRadiusAdjustment = builder.get_object('smallRadiusAdjustment')
        distanceAdjustment = builder.get_object('distanceAdjustment')
        # set the initial values to a neat shape
        bigRadiusAdjustment.set_value(self.bigRadius)
        smallRadiusAdjustment.set_value(self.smallRadius)
        distanceAdjustment.set_value(self.distance)
        # try and set the step size?!
        bigRadiusAdjustment.set_step_increment(0.5)
        smallRadiusAdjustment.set_step_increment(0.5)
        distanceAdjustment.set_step_increment(0.5)
        # create initial plot
        self.recalcPoints()
        self.showPlot()

    def calcEpiX(self, theta):
        return ((self.bigRadius + self.smallRadius) * math.cos(theta)) - (self.distance * math.cos(((self.bigRadius + self.smallRadius)/(self.smallRadius))*theta))

    def calcEpiY(self, theta):
        return ((self.bigRadius + self.smallRadius) * math.sin(theta)) - (self.distance * math.sin(((self.bigRadius + self.smallRadius)/(self.smallRadius))*theta))

    def calcHypoX(self, theta):
        return ((self.bigRadius - self.smallRadius) * math.cos(theta)) + (self.distance * math.cos(((self.bigRadius - self.smallRadius)/(self.smallRadius))*theta))

    def calcHypoY(self, theta):
        return ((self.bigRadius - self.smallRadius) * math.sin(theta)) - (self.distance * math.sin(((self.bigRadius - self.smallRadius)/(self.smallRadius))*theta))

    def onDestroy(self, widget):
        Gtk.main_quit()
        return

    def bigRadiusAdjustment_value_changed_cb(self, widget):
        self.bigRadius = widget.get_value()
        self.recalcPoints()
        self.updatePlot()

    def smallRadiusAdjustment_value_changed_cb(self, widget):
        self.smallRadius = widget.get_value()
        self.recalcPoints()
        self.updatePlot()

    def distanceAdjustment_value_changed_cb(self, widget):
        self.distance = widget.get_value()
        self.recalcPoints()
        self.updatePlot()

    def recalcPoints(self):
        self.epiX = np.array([self.calcEpiX(i) for i in np.arange(0, self.highestTheta, self.stepSize)])
        self.epiY = np.array([self.calcEpiY(i) for i in np.arange(0, self.highestTheta, self.stepSize)])
        self.hypoX = np.array([self.calcHypoX(i) for i in np.arange(0, self.highestTheta, self.stepSize)])
        self.hypoY = np.array([self.calcHypoY(i) for i in np.arange(0, self.highestTheta, self.stepSize)])

    def showPlot(self):
        viewport = builder.get_object('plotViewport')
        self.plotFigure = Figure(figsize=(5, 5), dpi=100)
        self.epiPlot, self.hypoPlot = self.plotFigure.subplots(1, 2)
        self.epiPlot.set_title(f"Epichondroid of {self.bigRadius}, {self.smallRadius}, {self.distance}")
        self.epiPlot.plot(self.epiX, self.epiY)
        self.hypoPlot.set_title(f"Hypochondroid of {self.bigRadius}, {self.smallRadius}, {self.distance}")
        self.hypoPlot.plot(self.hypoX, self.hypoY)

        self.canvas = FigureCanvas(self.plotFigure)
        self.canvas.set_size_request(800, 600)
        viewport.add(self.canvas)

    def updatePlot(self):
        self.epiPlot.clear()
        self.hypoPlot.clear()
        self.epiPlot.set_title(f"Epichondroid of {self.bigRadius}, {self.smallRadius}, {self.distance}")
        self.hypoPlot.set_title(f"Hypochondroid of {self.bigRadius}, {self.smallRadius}, {self.distance}")
        self.epiPlot.plot(self.epiX, self.epiY)
        self.hypoPlot.plot(self.hypoX, self.hypoY)
        self.canvas.draw_idle()

builder = Gtk.Builder()
builder.add_from_file("spirographs.glade")
sp = spirographs()
builder.connect_signals(sp)
window = builder.get_object("spWindow")
window.show_all()

Gtk.main()