antenna plot for XY plane measurements with nanovna

antenna_plot_2

import sys
import re
from pathlib import Path
from typing import List, Optional, Tuple

import numpy as np
from scipy.interpolate import PchipInterpolator
import matplotlib

matplotlib.use("QtAgg")
from matplotlib.backends.backend_qtagg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

from PyQt6.QtCore import Qt
from PyQt6.QtWidgets import (
    QApplication, QWidget, QVBoxLayout, QLabel, QPushButton, QHBoxLayout,
    QLineEdit, QScrollArea, QSizePolicy, QFileDialog, QSpacerItem
)


class PlotConfig:
    SMOOTH_POINTS = 360
    FIGURE_SIZE = (6, 6)
    THETA_OFFSET = np.pi / 2
    CURVE_LINEWIDTH = 2
    POINT_COLOR = 'red'
    RADIAL_LINE_COLOR = 'lightgray'
    RADIAL_LINE_STYLE = ':'
    RADIAL_LINE_WIDTH = 0.5
    CONCENTRIC_COLOR = 'gray'
    CONCENTRIC_WIDTH = 0.7


class PolarPlotter:
    def __init__(self, config: PlotConfig = PlotConfig()):
        self.config = config

    @staticmethod
    def db_to_radius(db: float) -> float:
        db = np.clip(db, -100, 0)
        return (db / 100 + 1) ** 5

    def prepare_data(self, angles_deg: List[float], values_db: List[float]):
        if len(angles_deg) < 2 or len(values_db) < 2:
            # Not enough points for interpolation; return empty arrays
            return np.array([]), np.array([]), np.array([]), np.array([])

        angles_rad = np.deg2rad(np.array(angles_deg) % 360)
        theta_smooth = np.linspace(0, 2 * np.pi, self.config.SMOOTH_POINTS)

        sort_idx = np.argsort(angles_rad)
        x_sorted = angles_rad[sort_idx]
        y_sorted = np.array([self.db_to_radius(db) for db in values_db])[sort_idx]

        # Extend for circular interpolation
        x_ext = np.concatenate([x_sorted, x_sorted[0:1] + 2 * np.pi])
        y_ext = np.concatenate([y_sorted, y_sorted[0:1]])

        pchip = PchipInterpolator(x_ext, y_ext, extrapolate=True)
        data_smooth = pchip(theta_smooth)

        return x_sorted, theta_smooth, data_smooth, y_sorted

    def plot_on_axis(self, ax, angles_deg: List[float], values_db: List[float]):
        ax.clear()

        # Prepare smooth data
        theta_samples, theta_smooth, r_plot, original_r = self.prepare_data(angles_deg, values_db)

        # Radial lines every 10° (draw first)
        for deg in range(0, 360, 10):
            ax.plot(
                [np.deg2rad(deg), np.deg2rad(deg)],
                [0, 1],
                self.config.RADIAL_LINE_STYLE,
                color=self.config.RADIAL_LINE_COLOR,
                linewidth=self.config.RADIAL_LINE_WIDTH,
                zorder=1
            )

        # Concentric circles (draw first)
        db_levels = np.arange(0, -101, -10)
        radii = [self.db_to_radius(db) for db in db_levels]
        for r in radii:
            ax.plot(
                np.linspace(0, 2 * np.pi, 360),
                np.ones(360) * r,
                color=self.config.CONCENTRIC_COLOR,
                linewidth=self.config.CONCENTRIC_WIDTH,
                zorder=2
            )

        # Graph line cyan and points red — on top
        ax.plot(theta_smooth, r_plot, linewidth=self.config.CURVE_LINEWIDTH, zorder=3)
        ax.plot(theta_samples, original_r, 'o', color=self.config.POINT_COLOR, zorder=4)

        # Offset 0 dB from edge
        ax.set_ylim(0, 1)

        ax.set_theta_direction(1)
        ax.set_theta_offset(self.config.THETA_OFFSET)

        ax.set_xticks(np.deg2rad([0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330]))
        ax.set_xticklabels(['0°', '30°', '60°', '90°', '120°', '150°', '180°', '210°', '240°', '270°', '300°', '330°'])

        yticks_labels_db = [0, -10, -20, -40]
        yticks_radii = [self.db_to_radius(db) for db in yticks_labels_db]
        ax.set_yticks(yticks_radii)
        ax.set_yticklabels([str(db) for db in yticks_labels_db])


class AntennaPlot(QWidget):
    DB_NUM_REGEX = re.compile(r'-?\d+(?:[.,]\d+)?')  # extract numeric part

    def __init__(self):
        super().__init__()
        self.plotter = PolarPlotter()
        self.current_step: int = 30
        self.db_lineedits: List[QLineEdit] = []
        self.degree_labels: List[QLabel] = []
        self.prev_db_texts: List[str] = []

        self._setup_ui()
        self._create_db_rows_for_step(self.current_step)
        # Automatic plotting with empty or placeholder data
        self._attempt_plot()

    def _setup_ui(self):
        self.setWindowTitle("Antenna Polar Plot (Step / dB inputs)")
        self.resize(900, 620)

        main_layout = QHBoxLayout()
        self.setLayout(main_layout)

        # ---------------- LEFT COLUMN ----------------
        left_col = QVBoxLayout()
        left_col.setAlignment(Qt.AlignmentFlag.AlignTop)
        main_layout.addLayout(left_col, stretch=3)

        top_btns = QHBoxLayout()
        top_btns.setAlignment(Qt.AlignmentFlag.AlignLeft)
        left_col.addLayout(top_btns)

        self.save_btn = QPushButton("Save")
        self.draw_btn = QPushButton("Draw")
        self.mirror_btn = QPushButton("Mirror L to R")

        top_btns.addWidget(self.save_btn)
        top_btns.addItem(QSpacerItem(6, 0))
        top_btns.addWidget(self.draw_btn)
        top_btns.addItem(QSpacerItem(8, 0))
        top_btns.addWidget(self.mirror_btn)
        top_btns.addStretch(1)

        self.canvas_fig = Figure(figsize=PlotConfig.FIGURE_SIZE)
        self.canvas = FigureCanvas(self.canvas_fig)
        self.canvas.setSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding)
        left_col.addWidget(self.canvas)

        self.ax = self.canvas.figure.add_subplot(
            1, 1, 1, projection='polar', theta_offset=PlotConfig.THETA_OFFSET
        )

        # Error label with fixed height
        self.error_label = QLabel()
        self.error_label.setFixedHeight(40)
        self.error_label.setWordWrap(True)
        left_col.addWidget(self.error_label)

        # ---------------- RIGHT COLUMN ----------------
        right_col = QVBoxLayout()
        right_col.setAlignment(Qt.AlignmentFlag.AlignLeft | Qt.AlignmentFlag.AlignTop)
        main_layout.addLayout(right_col, stretch=1)

        step_layout = QHBoxLayout()
        step_layout.setAlignment(Qt.AlignmentFlag.AlignLeft)
        right_col.addLayout(step_layout)

        step_layout.addWidget(QLabel("Step:"), alignment=Qt.AlignmentFlag.AlignLeft)

        self.step_input = QLineEdit()
        self.step_input.setFixedWidth(60)
        self.step_input.setText(str(self.current_step))
        step_layout.addWidget(self.step_input)

        step_layout.addWidget(QLabel("° (deg)"), alignment=Qt.AlignmentFlag.AlignLeft)
        step_layout.addItem(QSpacerItem(6, 0))

        self.set_btn = QPushButton("Set")
        self.set_btn.clicked.connect(self._on_set_step)
        step_layout.addWidget(self.set_btn)

        # Make Save, Draw, Mirror same size as Set
        hint = self.set_btn.sizeHint()
        self.save_btn.setFixedSize(hint)
        self.draw_btn.setFixedSize(hint)
        self.mirror_btn.setFixedSize(hint)

        self.draw_btn.clicked.connect(self._on_draw_clicked)
        self.save_btn.clicked.connect(self._on_save)
        self.mirror_btn.clicked.connect(self._on_mirror)

        # Scroll area with dB inputs
        self.scroll_area = QScrollArea()
        self.scroll_area.setWidgetResizable(True)
        right_col.addWidget(self.scroll_area)

        self.rows_container = QWidget()
        self.rows_layout = QVBoxLayout()
        self.rows_layout.setSpacing(2)  # reduced spacing
        self.rows_layout.setContentsMargins(2, 2, 2, 2)
        self.rows_layout.setAlignment(Qt.AlignmentFlag.AlignTop)
        self.rows_container.setLayout(self.rows_layout)

        self.scroll_area.setWidget(self.rows_container)

    def _clear_db_rows(self):
        while self.rows_layout.count():
            item = self.rows_layout.takeAt(0)
            widget = item.widget()
            if widget is not None:
                widget.deleteLater()
            # QSpacerItem has no .widget(), skip
        self.db_lineedits = []
        self.degree_labels = []

    def _create_db_rows_for_step(self, step: int, restore_prev: bool = True):
        prev_texts = [le.text() for le in self.db_lineedits] if self.db_lineedits else []
        self.prev_db_texts = prev_texts

        self._clear_db_rows()

        n_rows = max(1, int(360 / float(step)))

        deg_texts = [f"{i*step}°" for i in range(n_rows)]
        fm = self.fontMetrics()
        max_w = max(fm.horizontalAdvance(t) for t in deg_texts)

        for i in range(n_rows):
            angle = i * step
            label_text = f"{angle}°"

            row_widget = QWidget()
            row_layout = QHBoxLayout()
            row_layout.setContentsMargins(0, 0, 0, 0)
            row_layout.setSpacing(6)
            row_widget.setLayout(row_layout)

            lbl = QLabel(label_text)
            lbl.setFixedWidth(max_w)
            lbl.setAlignment(Qt.AlignmentFlag.AlignRight | Qt.AlignmentFlag.AlignVCenter)
            row_layout.addWidget(lbl)

            le = QLineEdit()
            le.setPlaceholderText("dB")
            le.setToolTip("Enter value in dB (-100..0)")
            le.setMinimumWidth(40)
            row_layout.addWidget(le)

            self.rows_layout.addWidget(row_widget)
            self.degree_labels.append(lbl)
            self.db_lineedits.append(le)

        if restore_prev and self.prev_db_texts:
            for idx, txt in enumerate(self.prev_db_texts):
                if idx < len(self.db_lineedits):
                    self.db_lineedits[idx].setText(txt)

        self.rows_layout.addStretch(1)

    def _parse_db_field(self, text: str) -> Optional[float]:
        if text is None or text.strip() == "":
            return None
        m = self.DB_NUM_REGEX.search(text)
        if not m:
            return None
        try:
            return float(m.group(0).replace(",", "."))
        except:
            return None

    def _validate_and_collect(self) -> Tuple[Optional[List[float]], Optional[List[float]], Optional[str]]:
        step_text = self.step_input.text().strip()
        try:
            step_val = float(step_text)
        except:
            return None, None, "Step value must be numeric."
        if not (1 <= step_val <= 180):
            return None, None, "Step is out of range (1-180)."

        angles, values, errors = [], [], []
        for idx, le in enumerate(self.db_lineedits, start=1):
            txt = le.text().strip()
            if txt == "":
                continue
            parsed = self._parse_db_field(txt)
            if parsed is None:
                errors.append(f"Non-numeric value at line {idx}.")
                continue
            if not (-100 <= parsed <= 0):
                errors.append(f"dB out of range at line {idx}.")
                continue
            angles.append((idx-1)*step_val)
            values.append(parsed)

        if errors:
            return None, None, " ".join(errors)
        if len(values) < 2:
            return None, None, "Not enough data points..."
        return angles, values, None

    def _attempt_plot(self):
        self.error_label.clear()
        self.ax.clear()
        angles, values, err = self._validate_and_collect()
        if err:
            # If no data, just draw empty polar
            self.plotter.plot_on_axis(self.ax, [], [])
            self.canvas.draw()
            if "Not enough data" not in err:
                self.error_label.setText(err)
            return

        if angles is None or len(angles) < 2:
            self.error_label.setText("Not enough points to plot.")
            self.ax.clear()
            self.canvas.draw()
            return

        try:
            self.plotter.plot_on_axis(self.ax, angles, values)
            self.canvas.draw()
            self.error_label.clear()
        except Exception as e:
            self.error_label.setText(f"Error plotting data: {e}")

    def _on_draw_clicked(self):
        self._attempt_plot()

    def _on_set_step(self):
        prev_texts = [le.text() for le in self.db_lineedits] if self.db_lineedits else []
        try:
            step_val = float(self.step_input.text().strip())
        except:
            self.error_label.setText("Step value must be numeric.")
            return
        if not (1 <= step_val <= 180):
            self.error_label.setText("Step is out of range (1-180).")
            return
        self.current_step = int(step_val)
        self.prev_db_texts = prev_texts
        self._create_db_rows_for_step(self.current_step, restore_prev=True)
        self.error_label.clear()

    def _on_mirror(self):
        n = len(self.db_lineedits)
        if n < 2:
            self.error_label.setText("Not enough fields to mirror.")
            return
        texts = [le.text().strip() for le in self.db_lineedits]
        for i in range(2, n + 1):
            target = n - (i - 2)
            if target <= i:
                break
            texts[target-1] = texts[i-1]
        for idx, val in enumerate(texts):
            self.db_lineedits[idx].setText(val)
        self._attempt_plot()

    def _on_save(self):
        angles, values, err = self._validate_and_collect()
        if err:
            self.error_label.setText(err)
            return
        try:
            matplotlib.use("Agg")
            fig = Figure(figsize=PlotConfig.FIGURE_SIZE)
            ax = fig.add_subplot(1,1,1,projection='polar', theta_offset=PlotConfig.THETA_OFFSET)
            self.plotter.plot_on_axis(ax, angles, values)
            filename, _ = QFileDialog.getSaveFileName(self, "Save Plot", "", "PNG (*.png);;JPG (*.jpg);;All Files (*)")
            if filename:
                fig.savefig(filename, dpi=150, bbox_inches='tight')
                self.error_label.setText(f"Saved to {Path(filename).name}")
        except Exception as e:
            self.error_label.setText(f"Saving error: {e}")
        finally:
            matplotlib.use("QtAgg")


def main():
    app = QApplication(sys.argv)
    win = AntennaPlot()
    win.show()
    sys.exit(app.exec())


if __name__ == "__main__":
    main()

You can generate .exe file. Just pip -install numpy, scipy, matplotlib and PyQt6. Then install with pip -install pyinstaller and run the command: pyinstaller --onefile --windowed antenna_plot_2.py

You need to enter 1-180 degree value in the "Step" field. You need to import at least two dB values, otherwise it will not draw the plot.
You can use "Mirror L to R" button, it will simply enter your first dB values in reversed order at the end of dB list and re-draw the plot.

Compiled .exe file is here - https://drive.google.com/file/d/1mIRidDbjz8svZOUpGXvjTezPPmLdWCGh/view?usp=sharing

Вы можете сгенерировать .exe файл. Просто выполните команду pip install numpy scipy matplotlib PyQt6. Затем установите pyinstaller командой pip install pyinstaller и выполните команду pyinstaller --onefile --windowed antenna_plot_2.py

В поле "Step" (шаг поворота антенны) необходимо ввести значение от 1 до 180 градусов. Необходимо импортировать как минимум два значения в дБ, иначе график не будет построен.
Вы можете использовать кнопку "Mirror L to R" — она просто добавит ваши первые значения в дБ в обратном порядке в конец списка дБ и перерисует график.