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| 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_() |
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This script illustrates performance problems related to the quantity of tick-marks on a matplotlib axis. Redraw time is roughly doubled for every 10-fold increase in tick-marks. By contrast, number of points in a scatter plot has very little impact on redraw time.