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fft_plot.py
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fft_plot.py
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#!/usr/bin/python3
# -*- coding: utf-8 -*-
__author__ = "kirintw and Billy Su"
__license__ = "GPL-2.0"
import pyqtgraph as pg
from PyQt5 import QtCore, QtGui, QtWidgets
from ws_fft import WS_FFT
from dialogs import ChannelSelector
class Spectrum_Plot(QtGui.QWidget):
resized = QtCore.pyqtSignal()
def __init__(self, url=None):
super().__init__()
if url is None:
url = "ws://localhost:7777"
#TODO setup ws2
self.ws_data = WS_FFT(url=url, plot_name="FFT_PS")
self.setWindowTitle("Power Spectrum(FFT)")
self.timer_interval = 0.5
self.v_scale = 600
self.h_min = 0
self.h_max = 30
self.sub_plot_size = 150
self.selected_channels = list(range(1, 9))
self.channel_selector_win = None
self.init_ui()
self.setup_signal_handler()
self.show()
def init_ui(self):
self.menu_bar = Menu_bar(self)
self.plot = Spectrum(self)
self.scroll = QtGui.QScrollBar()
scroll_range = self.ws_data.channel_num - 4
self.scroll.setMaximum(scroll_range)
grid_layout = QtGui.QGridLayout(self)
grid_layout.setMenuBar(self.menu_bar)
grid_layout.addWidget(self.plot, 0, 0, 15, 4)
grid_layout.addWidget(self.scroll, 0, 4, 15, 1)
self.update_display_plot_num()
def setup_signal_handler(self):
self.scroll.valueChanged.connect(self.update_display_plot_num)
self.resized.connect(self.update_display_plot_num)
self.timer = QtCore.QTimer()
self.timer.setInterval(self.timer_interval*1000)
self.timer.timeout.connect(self.update_plot)
self.timer.start()
def update_plot(self):
# get data from websocket
if self.ws_data.FFT_data:
self.plot.draw(self.ws_data.FFT_data.pop(0), self.ws_data.freq_label)
else:
pass
def resizeEvent(self, event):
self.resized.emit()
return super().resizeEvent(event)
def wheelEvent(self, event):
scroll_change = -(event.angleDelta().y() // 120)
scroll_val = self.scroll.value()
self.scroll.setValue(scroll_val + scroll_change)
def update_selected_channels(self, channels):
self.selected_channels = channels
def update_display_plot_num(self):
cur_idx = self.scroll.value()
plot_widget_height = self.plot.frameGeometry().height()
max_num_plot_in_widget = plot_widget_height // self.sub_plot_size
if max_num_plot_in_widget > len(self.selected_channels):
display_plot_count = len(self.selected_channels)
else:
display_plot_count = max_num_plot_in_widget
scroll_max = len(self.selected_channels) - max_num_plot_in_widget
if scroll_max < 0:
scroll_max = 0
if scroll_max != self.scroll.maximum():
self.scroll.setMaximum(scroll_max)
for i in range(self.ws_data.channel_num):
self.plot.plots[i].hide()
self.plot.ch_labels[i].hide()
for idx, i in enumerate(self.selected_channels):
i -= 1
if idx in range(cur_idx, cur_idx+max_num_plot_in_widget):
self.plot.plots[i].show()
self.plot.ch_labels[i].show()
self.plot.plots[i].setMaximumHeight((plot_widget_height-50) // display_plot_count)
else:
self.plot.ch_labels[i].hide()
self.plot.plots[i].hide()
class Menu_bar(QtGui.QWidget):
def __init__(self, parent):
super().__init__()
self.parent = parent
self.init_ui()
self.setup_signal_handler()
self.show()
def init_ui(self):
self.group_box = QtGui.QGroupBox("Scale Parameters")
self.v_scale_label = QtWidgets.QLabel("Vertical Scale")
self.v_scale_selector = QtGui.QSpinBox()
self.v_scale_selector.setMaximum(20000)
self.v_scale_selector.setValue(self.parent.v_scale)
self.h_min_label = QtWidgets.QLabel("Min Frequency")
self.min_spin = QtGui.QSpinBox()
self.min_spin.setMinimum(0)
self.min_spin.setValue(self.parent.h_min)
self.h_max_label = QtWidgets.QLabel("Max Frequency")
self.max_spin = QtGui.QSpinBox()
self.max_spin.setMaximum(20000)
self.max_spin.setValue(self.parent.h_max)
self.ch_select_btn = QtGui.QPushButton("Select Channels")
self.ch_select_btn.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
self.apply_btn = QtGui.QPushButton("Apply")
grid_layout = QtGui.QGridLayout(self)
group_layout = QtGui.QGridLayout(self.group_box)
group_layout.addWidget(self.v_scale_label, 0, 0, 1, 1)
group_layout.addWidget(self.v_scale_selector, 1, 0, 1, 1)
group_layout.addWidget(self.h_min_label, 0, 1, 1, 1)
group_layout.addWidget(self.min_spin, 1, 1, 1, 1)
group_layout.addWidget(self.h_max_label, 0 , 2, 1, 1)
group_layout.addWidget(self.max_spin, 1, 2, 1, 1)
group_layout.addWidget(self.apply_btn, 2, 2, 1, 1)
grid_layout.addWidget(self.group_box, 0, 0, 1, 1)
grid_layout.addWidget(self.ch_select_btn, 0, 1, 3, 1)
def setup_signal_handler(self):
self.ch_select_btn.clicked.connect(self.show_channel_select_window)
self.apply_btn.clicked.connect(self.update_scales)
def show_channel_select_window(self):
if self.parent.channel_selector_win is None:
self.parent.channel_selector_win = ChannelSelector(self.parent)
def update_scales(self):
self.parent.v_scale = int(self.v_scale_selector.text())
self.parent.h_min = self.min_spin.value()
self.parent.h_max = self.max_spin.value()
self.parent.update_plot()
class Spectrum(QtGui.QWidget):
def __init__(self, parent):
super().__init__()
self.parent = parent
self.bars = list()
self.init_ui()
self.show()
def init_ui(self):
grid_layout = QtGui.QGridLayout(self)
self.plots = list()
self.ch_labels = list()
while(self.parent.ws_data.ch_label is None): True
for i in range(8):
self.plots.append(pg.PlotWidget())
self.plots[i].setMenuEnabled(enableMenu=False)
self.plots[i].setMouseEnabled(x= False, y= False)
ch_name = self.parent.ws_data.ch_label[i]
self.ch_labels.append(QtGui.QLabel(ch_name))
grid_layout.addWidget(self.ch_labels[-1], i , 0, 1, 1)
grid_layout.addWidget(self.plots[-1], i, 1, 1, 20)
def draw(self, data, ticks):
ticks_labels = [[(v, str(v)) for v in ticks]]
for i in range(8):
self.plots[i].setYRange(0, self.parent.v_scale)
self.plots[i].setXRange(self.parent.h_min, self.parent.h_max)
bottom_ticks = self.plots[i].getAxis("bottom")
bottom_ticks.setTicks(ticks_labels)
while len(self.bars) <= i:
self.bars.append(None)
if self.bars[i] is None:
self.bars[i] = pg.BarGraphItem(x=ticks, height=data[i], width=ticks[1]-ticks[0])
self.plots[i].addItem(self.bars[i])
else:
self.bars[i].opts['height'] = data[i]
self.bars[i].drawPicture()
self.parent.update_display_plot_num()
if __name__ == "__main__":
app = QtGui.QApplication([])
plot = Spectrum_Plot()
app.exec_()