bec_widgets.utils.fps_counter

This module provides a utility class for counting and reporting frames per second (FPS) in a PyQtGraph application.

Classes:

FPSCounter: A class that monitors the paint events of a ViewBox to calculate and emit FPS values.

Usage:

The FPSCounter class can be used to monitor the rendering performance of a ViewBox in a PyQtGraph application. It connects to the ViewBox’s paint event and calculates the FPS over a specified interval, emitting the FPS value at regular intervals.

Example

from qtpy import QtWidgets, QtCore import pyqtgraph as pg from fps_counter import FPSCounter

app = pg.mkQApp(“FPS Counter Example”) win = pg.GraphicsLayoutWidget() win.show()

vb = pg.ViewBox() plot_item = pg.PlotItem(viewBox=vb) win.addItem(plot_item)

fps_counter = FPSCounter(vb) fps_counter.sigFpsUpdate.connect(lambda fps: print(f”FPS: {fps:.2f}”))

sys.exit(app.exec_())

Classes

FPSCounter

A utility class for counting and reporting frames per second (FPS).

Module Contents

class FPSCounter(view_box)

Bases: qtpy.QtCore.QObject

A utility class for counting and reporting frames per second (FPS).

This class connects to a ViewBox’s paint event to count the number of frames rendered and calculates the FPS over a specified interval. It emits a signal with the FPS value at regular intervals.

sigFpsUpdate

Signal emitted with the FPS value.

Type:

QtCore.Signal

view_box

The ViewBox instance to monitor.

Type:

pg.ViewBox

calculate_fps()

Calculate the frames per second (FPS) based on the number of frames

cleanup()

Clean up the FPS counter by stopping the timer and disconnecting the signal.

increment_count()

Increment the frame count when the ViewBox is painted.

count = 0

last_update

sigFpsUpdate

timer

view_box