101 lines
2.7 KiB
Python
101 lines
2.7 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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"""
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ViewBox is the general-purpose graphical container that allows the user to
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zoom / pan to inspect any area of a 2D coordinate system.
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This unimaginative example demonstrates the constrution of a ViewBox-based
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plot area with axes, very similar to the way PlotItem is built.
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"""
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## Add path to library (just for examples; you do not need this)
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import initExample
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## This example uses a ViewBox to create a PlotWidget-like interface
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import numpy as np
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from pyqtgraph.Qt import QtGui, QtCore
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import pyqtgraph as pg
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app = QtGui.QApplication([])
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mw = QtGui.QMainWindow()
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mw.setWindowTitle('pyqtgraph example: ViewBox')
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mw.show()
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mw.resize(800, 600)
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gv = pg.GraphicsView()
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mw.setCentralWidget(gv)
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l = QtGui.QGraphicsGridLayout()
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l.setHorizontalSpacing(0)
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l.setVerticalSpacing(0)
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vb = pg.ViewBox()
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p1 = pg.PlotDataItem()
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vb.addItem(p1)
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## Just something to play with inside the ViewBox
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class movableRect(QtGui.QGraphicsRectItem):
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def __init__(self, *args):
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QtGui.QGraphicsRectItem.__init__(self, *args)
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self.setAcceptHoverEvents(True)
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def hoverEnterEvent(self, ev):
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self.savedPen = self.pen()
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self.setPen(QtGui.QPen(QtGui.QColor(255, 255, 255)))
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ev.ignore()
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def hoverLeaveEvent(self, ev):
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self.setPen(self.savedPen)
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ev.ignore()
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def mousePressEvent(self, ev):
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if ev.button() == QtCore.Qt.LeftButton:
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ev.accept()
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self.pressDelta = self.mapToParent(ev.pos()) - self.pos()
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else:
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ev.ignore()
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def mouseMoveEvent(self, ev):
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self.setPos(self.mapToParent(ev.pos()) - self.pressDelta)
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rect = movableRect(QtCore.QRectF(0, 0, 1, 1))
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rect.setPen(QtGui.QPen(QtGui.QColor(100, 200, 100)))
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vb.addItem(rect)
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l.addItem(vb, 0, 1)
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gv.centralWidget.setLayout(l)
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xScale = pg.AxisItem(orientation='bottom', linkView=vb)
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l.addItem(xScale, 1, 1)
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yScale = pg.AxisItem(orientation='left', linkView=vb)
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l.addItem(yScale, 0, 0)
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xScale.setLabel(text="<span style='color: #ff0000; font-weight: bold'>X</span> <i>Axis</i>", units="s")
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yScale.setLabel('Y Axis', units='V')
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def rand(n):
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data = np.random.random(n)
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data[int(n*0.1):int(n*0.13)] += .5
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data[int(n*0.18)] += 2
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data[int(n*0.1):int(n*0.13)] *= 5
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data[int(n*0.18)] *= 20
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return data, np.arange(n, n+len(data)) / float(n)
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def updateData():
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yd, xd = rand(10000)
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p1.setData(y=yd, x=xd)
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yd, xd = rand(10000)
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updateData()
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vb.autoRange()
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t = QtCore.QTimer()
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t.timeout.connect(updateData)
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t.start(50)
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## Start Qt event loop unless running in interactive mode.
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if __name__ == '__main__':
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import sys
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if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
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QtGui.QApplication.instance().exec_()
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