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csv_2_plot: add support for customizing x-axis grid and label intervals

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Signed-off-by: YoungSoo Shin <shinys000114@gmail.com>
This commit is contained in:
YoungSoo Shin
2025-12-11 12:17:04 +09:00
parent c98e735410
commit 11f9c72543
1 changed files with 29 additions and 13 deletions
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42
example/logger/csv_2_plot.py
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@@ -8,21 +8,21 @@ from matplotlib.ticker import MultipleLocator, FuncFormatter
def plot_power_data(csv_path, output_path, plot_types, sources,
voltage_y_max=None, current_y_max=None, power_y_max=None,
relative_time=False):
relative_time=False, time_x_line=None, time_x_label=None):
"""
Reads power data from a CSV file and generates a plot image.
Args:
csv_path (str): The path to the input CSV file.
output_path (str): The path to save the output plot image.
plot_types (list): A list of strings indicating which plots to generate
(e.g., ['power', 'voltage', 'current']).
sources (list): A list of strings indicating which power sources to plot
(e.g., ['vin', 'main', 'usb']).
plot_types (list): A list of strings indicating which plots to generate.
sources (list): A list of strings indicating which power sources to plot.
voltage_y_max (float, optional): Maximum value for the voltage plot's Y-axis.
current_y_max (float, optional): Maximum value for the current plot's Y-axis.
power_y_max (float, optional): Maximum value for the power plot's Y-axis.
relative_time (bool): If True, the x-axis will show elapsed time from the start.
time_x_line (float, optional): Interval in seconds for x-axis grid lines.
time_x_label (float, optional): Interval in seconds for x-axis labels.
"""
try:
# Read the CSV file into a pandas DataFrame
@@ -123,7 +123,7 @@ def plot_power_data(csv_path, output_path, plot_types, sources,
ax.set_ylabel(config['ylabel'])
ax.legend()
# --- Grid and Tick Configuration ---
# --- Y-Grid and Tick Configuration ---
y_min, y_max = ax.get_ylim()
if plot_type == 'current' and y_max <= 2.5: major_interval = 0.5
elif y_max <= 10: major_interval = 2
@@ -142,7 +142,11 @@ def plot_power_data(csv_path, output_path, plot_types, sources,
elif y_val % 5 == 0:
ax.axhline(y=y_val, color='midnightblue', linestyle='--', linewidth=1.2, zorder=1)
# --- X-Grid Configuration ---
ax.xaxis.grid(True, which='major', linestyle='--', linewidth=0.8)
if time_x_line is not None:
ax.xaxis.grid(True, which='minor', linestyle=':', linewidth=0.6)
# --- Formatting the x-axis ---
last_ax = axes[-1]
@@ -150,16 +154,23 @@ def plot_power_data(csv_path, output_path, plot_types, sources,
last_ax.set_xlim(x_axis_data.iloc[0], x_axis_data.iloc[-1])
if relative_time:
last_ax.xaxis.set_major_locator(plt.MaxNLocator(15))
# Optional: Format to M:S if needed
# formatter = FuncFormatter(lambda s, x: f'{int(s//60)}:{int(s%60):02d}')
# last_ax.xaxis.set_major_formatter(formatter)
plt.xlabel('Elapsed Time (seconds)')
if time_x_label is not None:
last_ax.xaxis.set_major_locator(MultipleLocator(time_x_label))
else:
last_ax.xaxis.set_major_locator(plt.MaxNLocator(15))
if time_x_line is not None:
last_ax.xaxis.set_minor_locator(MultipleLocator(time_x_line))
else:
local_tz = gettz()
last_ax.xaxis.set_major_formatter(mdates.DateFormatter('%H:%M:%S', tz=local_tz))
last_ax.xaxis.set_major_locator(plt.MaxNLocator(15))
plt.xlabel(f'Time ({local_tz.tzname(df["timestamp"].iloc[-1])})')
last_ax.xaxis.set_major_formatter(mdates.DateFormatter('%H:%M:%S', tz=local_tz))
if time_x_label is not None:
last_ax.xaxis.set_major_locator(mdates.SecondLocator(interval=int(time_x_label)))
else:
last_ax.xaxis.set_major_locator(plt.MaxNLocator(15))
if time_x_line is not None:
last_ax.xaxis.set_minor_locator(mdates.SecondLocator(interval=int(time_x_line)))
plt.xticks(rotation=45)
@@ -223,6 +234,9 @@ def main():
action='store_true',
help="Display the x-axis as elapsed time from the start (in seconds) instead of absolute time."
)
parser.add_argument("--time_x_line", type=float, help="Interval in seconds for x-axis grid lines.")
parser.add_argument("--time_x_label", type=float, help="Interval in seconds for x-axis labels.")
args = parser.parse_args()
@@ -234,7 +248,9 @@ def main():
voltage_y_max=args.voltage_y_max,
current_y_max=args.current_y_max,
power_y_max=args.power_y_max,
relative_time=args.relative_time
relative_time=args.relative_time,
time_x_line=args.time_x_line,
time_x_label=args.time_x_label
)