#!/usr/bin/env python
# Contributed by Tomaz Curk in a bug report showing that the stack order of the
# curves was dependent on the number of curves. This has been fixed in Qwt.
#
# BarCurve is an idea of Tomaz Curk.
#
# Beautified and expanded by Gerard Vermeulen.
import random
import sys
import PyQt4.Qt as Qt
import PyQt4.Qwt5 as Qwt
class Spy(Qt.QObject):
def __init__(self, parent):
Qt.QObject.__init__(self, parent)
parent.setMouseTracking(True)
parent.installEventFilter(self)
# __init__()
def eventFilter(self, _, event):
if event.type() == Qt.QEvent.MouseMove:
self.emit(Qt.SIGNAL("MouseMove"), event.pos())
return False
# eventFilter()
# class Spy
class BarCurve(Qwt.QwtPlotCurve):
def __init__(self, penColor=Qt.Qt.black, brushColor=Qt.Qt.white):
Qwt.QwtPlotCurve.__init__(self)
self.penColor = penColor
self.brushColor = brushColor
# __init__()
def drawFromTo(self, painter, xMap, yMap, start, stop):
"""Draws rectangles with the corners taken from the x- and y-arrays.
"""
painter.setPen(Qt.QPen(self.penColor, 2))
painter.setBrush(self.brushColor)
if stop == -1:
stop = self.dataSize()
# force 'start' and 'stop' to be even and positive
if start & 1:
start -= 1
if stop & 1:
stop -= 1
start = max(start, 0)
stop = max(stop, 0)
for i in range(start, stop, 2):
px1 = xMap.transform(self.x(i))
py1 = yMap.transform(self.y(i))
px2 = xMap.transform(self.x(i+1))
py2 = yMap.transform(self.y(i+1))
painter.drawRect(px1, py1, (px2 - px1), (py2 - py1))
# drawFromTo()
# class BarCurve
class BarPlotMainWindow(Qt.QMainWindow):
colors = (Qt.Qt.red,
Qt.Qt.green,
Qt.Qt.blue,
Qt.Qt.cyan,
Qt.Qt.magenta,
Qt.Qt.yellow,
)
def __init__(self, parent=None):
Qt.QMainWindow.__init__(self, parent)
# Initialize a QwPlot central widget
self.plot = Qwt.QwtPlot(self)
self.plot.setTitle('left-click & drag to zoom')
self.plot.setCanvasBackground(Qt.Qt.white)
self.plot.plotLayout().setCanvasMargin(0)
self.plot.plotLayout().setAlignCanvasToScales(True)
self.setCentralWidget(self.plot)
grid = Qwt.QwtPlotGrid()
pen = Qt.QPen(Qt.Qt.DotLine)
pen.setColor(Qt.Qt.black)
pen.setWidth(0)
grid.setPen(pen)
grid.attach(self.plot)
self.__initTracking()
self.__initZooming()
self.__initToolBar()
# Finalize
self.counter.setValue(10)
self.go(self.counter.value())
# __init__()
def __initTracking(self):
"""Initialize tracking
"""
self.connect(Spy(self.plot.canvas()),
Qt.SIGNAL("MouseMove"),
self.showCoordinates)
self.statusBar().showMessage(
'Mouse movements in the plot canvas are shown in the status bar')
# __initTracking()
def showCoordinates(self, position):
self.statusBar().showMessage(
'x = %+.6g, y = %.6g'
% (self.plot.invTransform(Qwt.QwtPlot.xBottom, position.x()),
self.plot.invTransform(Qwt.QwtPlot.yLeft, position.y())))
# showCoordinates()
def __initZooming(self):
"""Initialize zooming
"""
self.zoomer = Qwt.QwtPlotZoomer(Qwt.QwtPlot.xBottom,
Qwt.QwtPlot.yLeft,
Qwt.QwtPicker.DragSelection,
Qwt.QwtPicker.AlwaysOff,
self.plot.canvas())
self.zoomer.setRubberBandPen(Qt.QPen(Qt.Qt.black))
# __initZooming()
def setZoomerMousePattern(self, index):
"""Set the mouse zoomer pattern.
"""
if index == 0:
pattern = [
Qwt.QwtEventPattern.MousePattern(Qt.Qt.LeftButton,
Qt.Qt.NoModifier),
Qwt.QwtEventPattern.MousePattern(Qt.Qt.MidButton,
Qt.Qt.NoModifier),
Qwt.QwtEventPattern.MousePattern(Qt.Qt.RightButton,
Qt.Qt.NoModifier),
Qwt.QwtEventPattern.MousePattern(Qt.Qt.LeftButton,
Qt.Qt.ShiftModifier),
Qwt.QwtEventPattern.MousePattern(Qt.Qt.MidButton,
Qt.Qt.ShiftModifier),
Qwt.QwtEventPattern.MousePattern(Qt.Qt.RightButton,
Qt.Qt.ShiftModifier),
]
self.zoomer.setMousePattern(pattern)
elif index in (1, 2, 3):
self.zoomer.initMousePattern(index)
else:
raise ValueError, 'index must be in (0, 1, 2, 3)'
# setZoomerMousePattern()
def __initToolBar(self):
"""Initialize the toolbar
"""
toolBar = Qt.QToolBar(self)
self.addToolBar(toolBar)
toolBar.addWidget(Qt.QLabel('Bars', toolBar))
self.counter = Qwt.QwtCounter(toolBar)
self.counter.setRange(0, 10000, 1)
self.counter.setNumButtons(3)
toolBar.addWidget(self.counter)
toolBar.addSeparator()
toolBar.addWidget(Qt.QLabel('Mouse', toolBar))
mouseComboBox = Qt.QComboBox(toolBar)
for name in ('3 buttons (PyQwt)',
'1 button',
'2 buttons',
'3 buttons (Qwt)'):
mouseComboBox.addItem(name)
mouseComboBox.setCurrentIndex(0)
toolBar.addWidget(mouseComboBox)
toolBar.addSeparator()
self.setZoomerMousePattern(0)
toolBar.addAction(Qt.QWhatsThis.createAction(toolBar))
self.plot.canvas().setWhatsThis(
'A QwtPlotZoomer lets you zoom infinitely deep '
'by saving the zoom states on a stack.\n\n'
'You can:\n'
'- select a zoom region\n'
'- unzoom all\n'
'- walk down the stack\n'
'- walk up the stack.\n\n'
'The combo box in the toolbar lets you attach '
'different sets of mouse events to those actions.'
)
self.counter.setWhatsThis(
'Select the number of bars'
)
mouseComboBox.setWhatsThis(
'Configure the zoomer mouse buttons.\n\n'
'3 buttons (PyQwt style):\n'
'- left-click & drag to zoom\n'
'- middle-click to unzoom all\n'
'- right-click to walk down the stack\n'
'- shift-right-click to walk up the stack.\n'
'1 button:\n'
'- click & drag to zoom\n'
'- control-click to unzoom all\n'
'- alt-click to walk down the stack\n'
'- shift-alt-click to walk up the stack.\n'
'2 buttons:\n'
'- left-click & drag to zoom\n'
'- right-click to unzoom all\n'
'- alt-left-click to walk down the stack\n'
'- alt-shift-left-click to walk up the stack.\n'
'3 buttons (Qwt style):\n'
'- left-click & drag to zoom\n'
'- right-click to unzoom all\n'
'- middle-click to walk down the stack\n'
'- shift-middle-click to walk up the stack.\n\n'
'If some of those key combinations interfere with '
'your Window manager, press the:\n'
'- escape-key to unzoom all\n'
'- minus-key to walk down the stack\n'
'- plus-key to walk up the stack.'
)
self.connect(self.counter,
Qt.SIGNAL('valueChanged(double)'),
self.go)
self.connect(mouseComboBox,
Qt.SIGNAL('activated(int)'),
self.setZoomerMousePattern)
# __initToolBar()
def go(self, value):
"""Create and plot a sequence of bars taking into account the controls
"""
n = int(value)
for bar in self.plot.itemList():
if isinstance(bar, BarCurve):
bar.detach()
for i in range(n):
bar = BarCurve(
self.colors[random.randint(0, len(self.colors)-1)],
self.colors[random.randint(0, len(self.colors)-1)],
)
bar.attach(self.plot)
bar.setData([i, i+1.4], [0.3*i, 5.0+0.3*i])
self.clearZoomStack()
# go()
def clearZoomStack(self):
"""Auto scale and clear the zoom stack
"""
self.plot.setAxisAutoScale(Qwt.QwtPlot.xBottom)
self.plot.setAxisAutoScale(Qwt.QwtPlot.yLeft)
self.plot.replot()
self.zoomer.setZoomBase()
# clearZoomStack()
# class BarPlotMainWindow
def make():
demo = BarPlotMainWindow()
demo.resize(500, 500)
demo.show()
return demo
# make()
def main(args):
app = Qt.QApplication(args)
demo = make()
sys.exit(app.exec_())
# main()
# Admire!
if __name__ == '__main__':
if 'settracemask' in sys.argv:
# for debugging, requires: python configure.py --trace ...
import sip
sip.settracemask(0x3f)
main(sys.argv)
# Local Variables: ***
# mode: python ***
# End: ***
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