kopia lustrzana https://github.com/NanoVNA-Saver/nanovna-saver
205 wiersze
7.5 KiB
Python
205 wiersze
7.5 KiB
Python
# NanoVNASaver
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#
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# A python program to view and export Touchstone data from a NanoVNA
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# Copyright (C) 2019, 2020 Rune B. Broberg
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# Copyright (C) 2020,2021 NanoVNA-Saver Authors
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import math
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import logging
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from typing import List
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import numpy as np
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from PyQt5 import QtGui
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from NanoVNASaver.Charts.Chart import Chart
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from NanoVNASaver.RFTools import Datapoint
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from .Frequency import FrequencyChart
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logger = logging.getLogger(__name__)
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class GroupDelayChart(FrequencyChart):
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def __init__(self, name="", reflective=True):
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super().__init__(name)
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self.name_unit = "ns"
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self.leftMargin = 40
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self.dim.width = 250
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self.dim.height = 250
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self.fstart = 0
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self.fstop = 0
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self.minDelay = 0
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self.maxDelay = 0
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self.span = 0
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self.reflective = reflective
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self.groupDelay = []
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self.groupDelayReference = []
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self.minDisplayValue = -180
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self.maxDisplayValue = 180
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def copy(self):
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new_chart: GroupDelayChart = super().copy()
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new_chart.reflective = self.reflective
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new_chart.groupDelay = self.groupDelay.copy()
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new_chart.groupDelayReference = self.groupDelay.copy()
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return new_chart
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def setReference(self, data):
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self.reference = data
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self.calculateGroupDelay()
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def setData(self, data):
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self.data = data
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self.calculateGroupDelay()
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def calculateGroupDelay(self):
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self.groupDelay = self.calc_data(self.data)
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self.groupDelayReference = self.calc_data(self.reference)
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self.update()
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def calc_data(self, data: List[Datapoint]):
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data_len = len(data)
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if data_len <= 1:
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return []
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unwrapped = np.degrees(np.unwrap([d.phase for d in data]))
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delay_data = []
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for i, d in enumerate(data):
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# TODO: Replace with call to RFTools.groupDelay
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if i == 0:
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phase_change = unwrapped[1] - unwrapped[i]
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freq_change = data[1].freq - d.freq
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elif i == data_len - 1:
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phase_change = unwrapped[-1] - unwrapped[-2]
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freq_change = d.freq - data[-2].freq
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else:
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phase_change = unwrapped[i+1] - unwrapped[i-1]
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freq_change = data[i+1].freq - data[i-1].freq
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delay = (-phase_change / (freq_change * 360)) * 10e8
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if not self.reflective:
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delay /= 2
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delay_data.append(delay)
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return delay_data
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def drawValues(self, qp: QtGui.QPainter):
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if len(self.data) == 0 and len(self.reference) == 0:
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return
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pen = QtGui.QPen(Chart.color.sweep)
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pen.setWidth(self.dim.point)
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line_pen = QtGui.QPen(Chart.color.sweep)
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line_pen.setWidth(self.dim.line)
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if self.fixedValues:
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min_delay = self.minDisplayValue
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max_delay = self.maxDisplayValue
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elif self.data:
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min_delay = math.floor(np.min(self.groupDelay))
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max_delay = math.ceil(np.max(self.groupDelay))
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elif self.reference:
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min_delay = math.floor(np.min(self.groupDelayReference))
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max_delay = math.ceil(np.max(self.groupDelayReference))
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span = max_delay - min_delay
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if span == 0:
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span = 0.01
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self.minDelay = min_delay
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self.maxDelay = max_delay
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self.span = span
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tickcount = math.floor(self.dim.height / 60)
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for i in range(tickcount):
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delay = min_delay + span * i / tickcount
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y = self.topMargin + round((self.maxDelay - delay) / self.span * self.dim.height)
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if delay not in {min_delay, max_delay}:
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qp.setPen(QtGui.QPen(Chart.color.text))
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# TODO use format class
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digits = 0 if delay == 0 else max(
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0, min(2, math.floor(3 - math.log10(abs(delay)))))
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delaystr = str(round(delay, digits if digits != 0 else None))
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qp.drawText(3, y + 3, delaystr)
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qp.setPen(QtGui.QPen(Chart.color.foreground))
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qp.drawLine(self.leftMargin - 5, y, self.leftMargin + self.dim.width, y)
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qp.drawLine(self.leftMargin - 5,
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self.topMargin,
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self.leftMargin + self.dim.width,
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self.topMargin)
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qp.setPen(Chart.color.text)
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qp.drawText(3, self.topMargin + 5, str(max_delay))
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qp.drawText(3, self.dim.height + self.topMargin, str(min_delay))
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self._set_start_stop()
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# Draw bands if required
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if self.bands.enabled:
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self.drawBands(qp, self.fstart, self.fstop)
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self.drawFrequencyTicks(qp)
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self.draw_data(qp, Chart.color.sweep,
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self.data, self.groupDelay)
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self.draw_data(qp, Chart.color.reference,
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self.reference, self.groupDelayReference)
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self.drawMarkers(qp)
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def draw_data(self, qp: QtGui.QPainter, color: QtGui.QColor,
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data: List[Datapoint], delay: List[Datapoint]):
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pen = QtGui.QPen(color)
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pen.setWidth(self.dim.point)
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line_pen = QtGui.QPen(color)
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line_pen.setWidth(self.dim.line)
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qp.setPen(pen)
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for i, d in enumerate(data):
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x = self.getXPosition(d)
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y = self.getYPositionFromDelay(delay[i])
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if self.isPlotable(x, y):
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qp.drawPoint(int(x), int(y))
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if self.flag.draw_lines and i > 0:
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prevx = self.getXPosition(data[i - 1])
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prevy = self.getYPositionFromDelay(delay[i - 1])
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qp.setPen(line_pen)
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if self.isPlotable(x, y) and self.isPlotable(prevx, prevy):
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qp.drawLine(x, y, prevx, prevy)
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elif self.isPlotable(x, y) and not self.isPlotable(prevx, prevy):
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new_x, new_y = self.getPlotable(x, y, prevx, prevy)
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qp.drawLine(x, y, new_x, new_y)
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elif not self.isPlotable(x, y) and self.isPlotable(prevx, prevy):
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new_x, new_y = self.getPlotable(prevx, prevy, x, y)
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qp.drawLine(prevx, prevy, new_x, new_y)
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qp.setPen(pen)
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def getYPosition(self, d: Datapoint) -> int:
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# TODO: Find a faster way than these expensive "d in data" lookups
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try:
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delay = self.groupDelay[self.data.index(d)]
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except ValueError:
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try:
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delay = self.groupDelayReference[self.reference.index(d)]
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except ValueError:
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delay = 0
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return self.getYPositionFromDelay(delay)
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def getYPositionFromDelay(self, delay: float):
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return self.topMargin + round((self.maxDelay - delay) / self.span * self.dim.height)
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def valueAtPosition(self, y) -> List[float]:
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absy = y - self.topMargin
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val = -1 * ((absy / self.dim.height * self.span) - self.maxDelay)
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return [val]
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