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

import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt
from matplotlib.widgets import Slider, Button

PI = np.pi

N_PTS = 400

class MLI_plot:
    """Classe de graphique MLI"""
    
    phase = 2*PI/3*np.array([0, 1, 2])
    phasor = np.linspace(0-phase, 2*PI-phase, N_PTS).T
    theta = phasor[0,:]

    def __init__(self):
        # Attributs scalaires
        self.v_eff = 100
        self.v_max = np.sqrt(2)*self.v_eff
        self.v_ref = np.zeros(self.phasor.shape)
        self.phi = 30
        
        # Attributs graphiques
        self.fig = plt.figure()
        self.ax = [
            plt.axes([0.1, 0.2, 0.40, 0.6]),
            plt.axes([0.45, 0.1, 0.55, 0.8]),
            plt.axes([0.01, 0.1, 0.03, 0.8]),
            plt.axes([0.1, 0.01, 0.8, 0.03])]
        self.amp_slider = Slider(
            ax=self.ax[2],
            label="Tension\nefficace",
            valmin=0,
            valmax=2*self.v_eff,
            valinit=self.v_eff,
            orientation="vertical"
        )
        self.phi_slider = Slider(
            ax=self.ax[3],
            label="Phase [°]",
            valmin=0,
            valmax=360,
            valinit=self.phi,
            orientation="horizontal"
        )
        self.amp_slider
        self.timegraph_plot = []
        self.vectorgraph_plot = []
        self.vectorgraph_arrow = []
        
        # Tracé du graphique
        self.setup()
        self.update()
        
        return

    def setup(self):
        self.fig.subplots_adjust(left=0.25)
        self.setup_timegraph()
        self.setup_vectorgraph()
        
        self.amp_slider.on_changed(self.update)
        self.phi_slider.on_changed(self.update)
        return

    def setup_timegraph(self):
        self.timegraph_plot = [self.ax[0].plot(self.theta, self.v_ref[i])[0] for i in range(3)]
        
        self.ax[0].grid()
        self.ax[0].set_xlim([0, 2*PI])
        self.ax[0].set_xticks([i*PI/6 for i in range(13)])
        self.ax[0].set_xticklabels([str(30*i)+"°" for i in range(13)])
        self.ax[0].set_xlabel("Angle")
        self.ax[0].set_ylim([-3*self.v_eff, +3*self.v_eff])
        self.ax[0].set_ylabel("Tension [V]")
        
        self.timegraph_plot.append(
            self.ax[0].plot([self.phi*PI/180, self.phi*PI/180],
                            self.ax[0].get_ylim(),
                            '--r')[0]
            )
        self.timegraph_plot.append(
            self.ax[0].scatter(3*[self.phi*PI/180],
            [self.v_max*np.cos((self.phi-i*120)*PI/180) for i in range(3)],
            c=["C0", "C1", "C2"]))
        
        return

    def setup_vectorgraph(self):
        self.ax[1] = plt.subplot(122, polar=True)
        self.ax[1].set_rorigin(0)
        self.ax[1].set_ylim(0, 3*self.v_eff)
        
        theta_ticks = np.arange(0, 360, 30)
        theta_labels = [str(t * (t<=180)
                        + (t-360) * (t>180)) + "°"
                        for t in theta_ticks]
        self.ax[1].set_thetagrids(theta_ticks, labels=theta_labels)
        
        self.vectorgraph_plot.append(self.ax[1].plot(self.theta, self.v_max*np.ones(self.theta.shape), 'r')[0])
        self.vectorgraph_arrow = [self.ax[1].arrow(0, 0, 0, self.v_max,
                                                   lw=2, head_width=0.05, head_length=self.v_max/15,
                                                   color="C"+str(i), length_includes_head=True,
                                                   transform=(mpl.transforms.Affine2D().translate((self.phi-i*120)*PI/180, 0)
                                                              +self.ax[1].transData)
                                                   )
                                  for i in range(3)]
        return

    def update(self, val=None):
        self.set_veff(self.amp_slider.val)
        self.phi = self.phi_slider.val
        self.update_timegraph()
        self.update_vectorgraph()
        return

    def update_timegraph(self):
        self.timegraph_plot[0].set_ydata(self.v_ref[0])
        self.timegraph_plot[1].set_ydata(self.v_ref[1])
        self.timegraph_plot[2].set_ydata(self.v_ref[2])
        self.timegraph_plot[3].set_xdata(2*[self.phi*PI/180])
        self.timegraph_plot[4].set_offsets(
            np.array([3*[self.phi*PI/180],
                     [self.v_max*np.cos((self.phi-i*120)*PI/180) for i in range(3)]]
                     ).T
            )
        return

    def update_vectorgraph(self):
        self.vectorgraph_plot[0].set_ydata(self.v_max*np.ones(self.theta.shape))
        
        for i, arrow in enumerate(self.vectorgraph_arrow):
            arrow.set_data(dy=self.v_max)
            arrow.set_transform(mpl.transforms.Affine2D().translate((self.phi-i*120)*PI/180, 0)
                                +self.ax[1].transData)
        return

    def reset(self, event=None):
        return

    def set_veff(self, v_eff):
        self.v_eff = v_eff
        self.v_max = np.sqrt(2)*v_eff
        self.v_ref = self.v_max*np.cos(self.phasor)
        return

    def set_vmax(self, v_max):
        self.v_max = v_max
        self.v_eff = v_max/np.sqrt(2)
        self.v_ref = self.v_max*np.cos(self.phasor)
        return

if __name__ == '__main__':
    # Execute when the module is not initialized from an import statement.
    plt.close('all')
    myMLI_plot = MLI_plot()