commit 5e0b6cb049d86e8780e4b84279b3a3c6391b9497
Author: Mika <kontakt@donau2space.de>
Date:   Sun May 24 02:06:20 2026 +0000

    Add geiger_counter_visualizer/src/geiger_counter_visualizer/core.py

diff --git a/geiger_counter_visualizer/src/geiger_counter_visualizer/core.py b/geiger_counter_visualizer/src/geiger_counter_visualizer/core.py
new file mode 100644
index 0000000..ca658b8
--- /dev/null
+++ b/geiger_counter_visualizer/src/geiger_counter_visualizer/core.py
@@ -0,0 +1,107 @@
+from __future__ import annotations
+
+import logging
+from dataclasses import dataclass
+from datetime import datetime
+from typing import List
+import time
+
+import pandas as pd
+import matplotlib.pyplot as plt
+from matplotlib.animation import FuncAnimation
+
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="[%(asctime)s] %(levelname)s - %(message)s",
+    datefmt="%Y-%m-%d %H:%M:%S",
+)
+logger = logging.getLogger(__name__)
+
+
+class DataValidationError(ValueError):
+    """Custom exception for invalid DataPoint input."""
+    pass
+
+
+@dataclass
+class DataPoint:
+    """Repräsentiert ein einzelnes Messereignis eines Geigerzählers."""
+
+    timestamp: str
+    count: int
+    frequency: float
+
+    def __post_init__(self) -> None:
+        if not isinstance(self.timestamp, str):
+            raise DataValidationError("timestamp must be a string in ISO format")
+        try:
+            datetime.fromisoformat(self.timestamp)
+        except ValueError as e:
+            raise DataValidationError(f"Invalid timestamp format: {self.timestamp}") from e
+
+        if not isinstance(self.count, int) or self.count < 0:
+            raise DataValidationError("count must be a non-negative integer")
+        if not isinstance(self.frequency, (int, float)) or self.frequency < 0:
+            raise DataValidationError("frequency must be a non-negative number")
+
+
+# Public API function
+def visualize_data(data: List[DataPoint]) -> None:
+    """Visualisiert eine Sequenz von Geigerzählerdaten in Echtzeit."""
+
+    if not isinstance(data, list) or not all(isinstance(d, DataPoint) for d in data):
+        raise DataValidationError("Input data must be a list of DataPoint instances.")
+
+    logger.info(f"Starting visualization with {len(data)} data points.")
+
+    df = pd.DataFrame([{ 
+        'timestamp': datetime.fromisoformat(d.timestamp),
+        'count': d.count,
+        'frequency': d.frequency
+    } for d in data])
+
+    fig, ax1 = plt.subplots()
+    plt.title("Geiger Counter Data Visualization")
+
+    ax1.set_xlabel("Time")
+    ax1.set_ylabel("Counts", color='tab:blue')
+    line1, = ax1.plot_date([], [], '-', color='tab:blue', label='Counts')
+
+    ax2 = ax1.twinx()
+    ax2.set_ylabel("Frequency (Hz)", color='tab:red')
+    line2, = ax2.plot_date([], [], '-', color='tab:red', label='Frequency')
+
+    plt.legend(loc='upper left')
+
+    def init():
+        line1.set_data([], [])
+        line2.set_data([], [])
+        return line1, line2
+
+    def update(frame_idx):
+        sub_df = df.iloc[:frame_idx + 1]
+        line1.set_data(sub_df['timestamp'], sub_df['count'])
+        line2.set_data(sub_df['timestamp'], sub_df['frequency'])
+        ax1.relim()
+        ax1.autoscale_view()
+        ax2.relim()
+        ax2.autoscale_view()
+        logger.debug(f"Frame {frame_idx+1}/{len(df)} updated.")
+        return line1, line2
+
+    ani = FuncAnimation(
+        fig,
+        update,
+        frames=len(df),
+        init_func=init,
+        interval=500,
+        blit=False,
+        repeat=False,
+    )
+
+    plt.tight_layout()
+    plt.show(block=True)
+
+    logger.info("Visualization completed successfully.")
+    return None
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