matplotlib example mpl tick speed test (snippet)

Python matplotlib example 'mpl tick speed test'

Modules used in program:

import matplotlib.ticker
import matplotlib
import numpy
import time

python mpl tick speed test

Python matplotlib example: mpl tick speed test

import time
import numpy
from PySide import QtCore, QtGui
import matplotlib
import matplotlib.ticker
matplotlib.use('Qt4Agg')
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

class Graph(QtGui.QWidget):
    def __init__(self, parent=None):
        super(Graph, self).__init__(parent)

        self.figure = Figure(figsize=(600, 600), dpi=72, facecolor=(1, 1, 1), edgecolor=(0, 0, 0), tight_layout=True)
        self.canvas = FigureCanvas(self.figure)
        self.ax = self.figure.add_subplot(1, 1, 1)

        self.layout = QtGui.QVBoxLayout(self)

        self.header = QtGui.QHBoxLayout()

        self.form = QtGui.QFormLayout()
        self.num_points_edit = QtGui.QLineEdit()
        self.num_points_edit.setText('100')
        self.num_points_edit.editingFinished.connect(self.present_axis)
        self.num_ticks_edit = QtGui.QLineEdit()
        self.num_ticks_edit.setText('10')
        self.num_ticks_edit.editingFinished.connect(self.present_axis)
        self.form.addRow('Points', self.num_points_edit)
        self.form.addRow('Ticks', self.num_ticks_edit)

        self.header.addLayout(self.form)
        self.commands = QtGui.QDialogButtonBox(QtCore.Qt.Vertical)
        self.commands.addButton('Test FPS', QtGui.QDialogButtonBox.ActionRole).clicked.connect(self.test_fps)
        self.header.addWidget(self.commands)

        self.layout.addLayout(self.header)
        self.layout.addWidget(self.canvas)

    def present_axis(self):
        self.points = int(self.num_points_edit.text())
        self.ticks = int(self.num_ticks_edit.text())

        if hasattr(self, 'scat'):
            self.scat.remove()

        self.scat = self.ax.scatter(numpy.arange(self.points), numpy.sin(numpy.arange(self.points)))
        self.ax.xaxis.set_minor_locator(matplotlib.ticker.LinearLocator(self.ticks))
        self.ax.yaxis.set_minor_locator(matplotlib.ticker.LinearLocator(self.ticks))
        self.canvas.draw()

    def test_fps(self):
        self.start_test = time.time()
        self.test_count = 0
        QtCore.QTimer.singleShot(0, self._internal_test)

    def _internal_test(self):
        now = time.time()
        if now - self.start_test > 1.:
            print('Points:  {}; Ticks:  {};  FPS:  {}'.format(self.points, self.ticks, self.test_count))
            return
        self.canvas.draw()
        self.test_count += 1
        QtCore.QTimer.singleShot(0, self._internal_test)

app = QtGui.QApplication([])
w = QtGui.QMainWindow()
w.setCentralWidget(Graph())
w.show()
app.exec_()

Python links

Learn Python: https://pythonbasics.org/
Python Tutorial: https://pythonprogramminglanguage.com