Viewing file:  backend_qt4.py (20.51 KB) -rw-r--r--
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from __future__ import division
import math
import os
import sys
import matplotlib
from matplotlib import verbose
from matplotlib.cbook import is_string_like, onetrue
from matplotlib.backend_bases import RendererBase, GraphicsContextBase, \
FigureManagerBase, FigureCanvasBase, NavigationToolbar2, IdleEvent, cursors
from matplotlib._pylab_helpers import Gcf
from matplotlib.figure import Figure
from matplotlib.mathtext import MathTextParser
from matplotlib.widgets import SubplotTool
try:
from PyQt4 import QtCore, QtGui, Qt
except ImportError:
raise ImportError("Qt4 backend requires that PyQt4 is installed.")
backend_version = "0.9.1"
def fn_name(): return sys._getframe(1).f_code.co_name
DEBUG = False
cursord = {
cursors.MOVE : QtCore.Qt.SizeAllCursor,
cursors.HAND : QtCore.Qt.PointingHandCursor,
cursors.POINTER : QtCore.Qt.ArrowCursor,
cursors.SELECT_REGION : QtCore.Qt.CrossCursor,
}
def draw_if_interactive():
"""
Is called after every pylab drawing command
"""
if matplotlib.is_interactive():
figManager = Gcf.get_active()
if figManager != None:
figManager.canvas.draw_idle()
def _create_qApp():
"""
Only one qApp can exist at a time, so check before creating one.
"""
if QtGui.QApplication.startingUp():
if DEBUG: print "Starting up QApplication"
global qApp
qApp = QtGui.QApplication( [" "] )
QtCore.QObject.connect( qApp, QtCore.SIGNAL( "lastWindowClosed()" ),
qApp, QtCore.SLOT( "quit()" ) )
#remember that matplotlib created the qApp - will be used by show()
_create_qApp.qAppCreatedHere = True
_create_qApp.qAppCreatedHere = False
def show():
"""
Show all the figures and enter the qt main loop
This should be the last line of your script
"""
for manager in Gcf.get_all_fig_managers():
manager.window.show()
if DEBUG: print 'Inside show'
figManager = Gcf.get_active()
if figManager != None:
figManager.canvas.draw()
if _create_qApp.qAppCreatedHere:
QtGui.qApp.exec_()
def new_figure_manager( num, *args, **kwargs ):
"""
Create a new figure manager instance
"""
thisFig = Figure( *args, **kwargs )
canvas = FigureCanvasQT( thisFig )
manager = FigureManagerQT( canvas, num )
return manager
class FigureCanvasQT( QtGui.QWidget, FigureCanvasBase ):
keyvald = { QtCore.Qt.Key_Control : 'control',
QtCore.Qt.Key_Shift : 'shift',
QtCore.Qt.Key_Alt : 'alt',
}
# left 1, middle 2, right 3
buttond = {1:1, 2:3, 4:2}
def __init__( self, figure ):
if DEBUG: print 'FigureCanvasQt: ', figure
_create_qApp()
QtGui.QWidget.__init__( self )
FigureCanvasBase.__init__( self, figure )
self.figure = figure
self.setMouseTracking( True )
self._idle = True
# hide until we can test and fix
#self.startTimer(backend_IdleEvent.milliseconds)
w,h = self.get_width_height()
self.resize( w, h )
def __timerEvent(self, event):
# hide until we can test and fix
self.mpl_idle_event(event)
def enterEvent(self, event):
FigureCanvasBase.enter_notify_event(self, event)
def leaveEvent(self, event):
FigureCanvasBase.leave_notify_event(self, event)
def mousePressEvent( self, event ):
x = event.pos().x()
# flipy so y=0 is bottom of canvas
y = self.figure.bbox.height - event.pos().y()
button = self.buttond[event.button()]
FigureCanvasBase.button_press_event( self, x, y, button )
if DEBUG: print 'button pressed:', event.button()
def mouseMoveEvent( self, event ):
x = event.x()
# flipy so y=0 is bottom of canvas
y = self.figure.bbox.height - event.y()
FigureCanvasBase.motion_notify_event( self, x, y )
#if DEBUG: print 'mouse move'
def mouseReleaseEvent( self, event ):
x = event.x()
# flipy so y=0 is bottom of canvas
y = self.figure.bbox.height - event.y()
button = self.buttond[event.button()]
FigureCanvasBase.button_release_event( self, x, y, button )
if DEBUG: print 'button released'
def wheelEvent( self, event ):
x = event.x()
# flipy so y=0 is bottom of canvas
y = self.figure.bbox.height - event.y()
# from QWheelEvent::delta doc
steps = event.delta()/120
if (event.orientation() == Qt.Qt.Vertical):
FigureCanvasBase.scroll_event( self, x, y, steps)
if DEBUG: print 'scroll event : delta = %i, steps = %i ' % (event.delta(),steps)
def keyPressEvent( self, event ):
key = self._get_key( event )
FigureCanvasBase.key_press_event( self, key )
if DEBUG: print 'key press', key
def keyReleaseEvent( self, event ):
key = self._get_key(event)
FigureCanvasBase.key_release_event( self, key )
if DEBUG: print 'key release', key
def resizeEvent( self, event ):
if DEBUG: print 'resize (%d x %d)' % (event.size().width(), event.size().height())
w = event.size().width()
h = event.size().height()
if DEBUG: print "FigureCanvasQtAgg.resizeEvent(", w, ",", h, ")"
dpival = self.figure.dpi
winch = w/dpival
hinch = h/dpival
self.figure.set_size_inches( winch, hinch )
self.draw()
self.update()
QtGui.QWidget.resizeEvent(self, event)
def sizeHint( self ):
w, h = self.get_width_height()
return QtCore.QSize( w, h )
def minumumSizeHint( self ):
return QtCore.QSize( 10, 10 )
def _get_key( self, event ):
if event.key() < 256:
key = str(event.text())
elif event.key() in self.keyvald:
key = self.keyvald[ event.key() ]
else:
key = None
return key
def flush_events(self):
Qt.qApp.processEvents()
def start_event_loop(self,timeout):
FigureCanvasBase.start_event_loop_default(self,timeout)
start_event_loop.__doc__=FigureCanvasBase.start_event_loop_default.__doc__
def stop_event_loop(self):
FigureCanvasBase.stop_event_loop_default(self)
stop_event_loop.__doc__=FigureCanvasBase.stop_event_loop_default.__doc__
def draw_idle(self):
'update drawing area only if idle'
d = self._idle
self._idle = False
def idle_draw(*args):
self.draw()
self._idle = True
if d: QtCore.QTimer.singleShot(0, idle_draw)
class FigureManagerQT( FigureManagerBase ):
"""
Public attributes
canvas : The FigureCanvas instance
num : The Figure number
toolbar : The qt.QToolBar
window : The qt.QMainWindow
"""
def __init__( self, canvas, num ):
if DEBUG: print 'FigureManagerQT.%s' % fn_name()
FigureManagerBase.__init__( self, canvas, num )
self.canvas = canvas
self.window = QtGui.QMainWindow()
self.window.setAttribute(QtCore.Qt.WA_DeleteOnClose)
self.window.setWindowTitle("Figure %d" % num)
image = os.path.join( matplotlib.rcParams['datapath'],'images','matplotlib.png' )
self.window.setWindowIcon(QtGui.QIcon( image ))
# Give the keyboard focus to the figure instead of the manager
self.canvas.setFocusPolicy( QtCore.Qt.ClickFocus )
self.canvas.setFocus()
QtCore.QObject.connect( self.window, QtCore.SIGNAL( 'destroyed()' ),
self._widgetclosed )
self.window._destroying = False
self.toolbar = self._get_toolbar(self.canvas, self.window)
self.window.addToolBar(self.toolbar)
QtCore.QObject.connect(self.toolbar, QtCore.SIGNAL("message"),
self.window.statusBar().showMessage)
self.window.setCentralWidget(self.canvas)
if matplotlib.is_interactive():
self.window.show()
# attach a show method to the figure for pylab ease of use
self.canvas.figure.show = lambda *args: self.window.show()
def notify_axes_change( fig ):
# This will be called whenever the current axes is changed
if self.toolbar != None: self.toolbar.update()
self.canvas.figure.add_axobserver( notify_axes_change )
def _widgetclosed( self ):
if self.window._destroying: return
self.window._destroying = True
Gcf.destroy(self.num)
def _get_toolbar(self, canvas, parent):
# must be inited after the window, drawingArea and figure
# attrs are set
if matplotlib.rcParams['toolbar'] == 'classic':
print "Classic toolbar is not supported"
elif matplotlib.rcParams['toolbar'] == 'toolbar2':
toolbar = NavigationToolbar2QT(canvas, parent, False)
else:
toolbar = None
return toolbar
def resize(self, width, height):
'set the canvas size in pixels'
self.window.resize(width, height)
def destroy( self, *args ):
if self.window._destroying: return
self.window._destroying = True
QtCore.QObject.disconnect( self.window, QtCore.SIGNAL( 'destroyed()' ),
self._widgetclosed )
if self.toolbar: self.toolbar.destroy()
if DEBUG: print "destroy figure manager"
self.window.close()
def set_window_title(self, title):
self.window.setWindowTitle(title)
class NavigationToolbar2QT( NavigationToolbar2, QtGui.QToolBar ):
def __init__(self, canvas, parent, coordinates=True):
""" coordinates: should we show the coordinates on the right? """
self.canvas = canvas
self.coordinates = coordinates
QtGui.QToolBar.__init__( self, parent )
NavigationToolbar2.__init__( self, canvas )
def _icon(self, name):
return QtGui.QIcon(os.path.join(self.basedir, name))
def _init_toolbar(self):
self.basedir = os.path.join(matplotlib.rcParams[ 'datapath' ],'images')
a = self.addAction(self._icon('home.svg'), 'Home', self.home)
a.setToolTip('Reset original view')
a = self.addAction(self._icon('back.svg'), 'Back', self.back)
a.setToolTip('Back to previous view')
a = self.addAction(self._icon('forward.svg'), 'Forward', self.forward)
a.setToolTip('Forward to next view')
self.addSeparator()
a = self.addAction(self._icon('move.svg'), 'Pan', self.pan)
a.setToolTip('Pan axes with left mouse, zoom with right')
a = self.addAction(self._icon('zoom_to_rect.svg'), 'Zoom', self.zoom)
a.setToolTip('Zoom to rectangle')
self.addSeparator()
a = self.addAction(self._icon('subplots.png'), 'Subplots',
self.configure_subplots)
a.setToolTip('Configure subplots')
a = self.addAction(self._icon('filesave.svg'), 'Save',
self.save_figure)
a.setToolTip('Save the figure')
self.buttons = {}
# Add the x,y location widget at the right side of the toolbar
# The stretch factor is 1 which means any resizing of the toolbar
# will resize this label instead of the buttons.
if self.coordinates:
self.locLabel = QtGui.QLabel( "", self )
self.locLabel.setAlignment(
QtCore.Qt.AlignRight | QtCore.Qt.AlignTop )
self.locLabel.setSizePolicy(
QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Ignored))
labelAction = self.addWidget(self.locLabel)
labelAction.setVisible(True)
# reference holder for subplots_adjust window
self.adj_window = None
def dynamic_update( self ):
self.canvas.draw()
def set_message( self, s ):
self.emit(QtCore.SIGNAL("message"), s)
if self.coordinates:
self.locLabel.setText(s.replace(', ', '\n'))
def set_cursor( self, cursor ):
if DEBUG: print 'Set cursor' , cursor
QtGui.QApplication.restoreOverrideCursor()
QtGui.QApplication.setOverrideCursor( QtGui.QCursor( cursord[cursor] ) )
def draw_rubberband( self, event, x0, y0, x1, y1 ):
height = self.canvas.figure.bbox.height
y1 = height - y1
y0 = height - y0
w = abs(x1 - x0)
h = abs(y1 - y0)
rect = [ int(val)for val in min(x0,x1), min(y0, y1), w, h ]
self.canvas.drawRectangle( rect )
def configure_subplots(self):
self.adj_window = QtGui.QMainWindow()
win = self.adj_window
win.setAttribute(QtCore.Qt.WA_DeleteOnClose)
win.setWindowTitle("Subplot Configuration Tool")
image = os.path.join( matplotlib.rcParams['datapath'],'images','matplotlib.png' )
win.setWindowIcon(QtGui.QIcon( image ))
tool = SubplotToolQt(self.canvas.figure, win)
win.setCentralWidget(tool)
win.setSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Preferred)
win.show()
def _get_canvas(self, fig):
return FigureCanvasQT(fig)
def save_figure( self ):
filetypes = self.canvas.get_supported_filetypes_grouped()
sorted_filetypes = filetypes.items()
sorted_filetypes.sort()
default_filetype = self.canvas.get_default_filetype()
start = "image." + default_filetype
filters = []
selectedFilter = None
for name, exts in sorted_filetypes:
exts_list = " ".join(['*.%s' % ext for ext in exts])
filter = '%s (%s)' % (name, exts_list)
if default_filetype in exts:
selectedFilter = filter
filters.append(filter)
filters = ';;'.join(filters)
fname = QtGui.QFileDialog.getSaveFileName(
self, "Choose a filename to save to", start, filters, selectedFilter)
if fname:
try:
self.canvas.print_figure( unicode(fname) )
except Exception, e:
QtGui.QMessageBox.critical(
self, "Error saving file", str(e),
QtGui.QMessageBox.Ok, QtGui.QMessageBox.NoButton)
class SubplotToolQt( SubplotTool, QtGui.QWidget ):
def __init__(self, targetfig, parent):
QtGui.QWidget.__init__(self, None)
self.targetfig = targetfig
self.parent = parent
self.sliderleft = QtGui.QSlider(QtCore.Qt.Horizontal)
self.sliderbottom = QtGui.QSlider(QtCore.Qt.Vertical)
self.sliderright = QtGui.QSlider(QtCore.Qt.Horizontal)
self.slidertop = QtGui.QSlider(QtCore.Qt.Vertical)
self.sliderwspace = QtGui.QSlider(QtCore.Qt.Horizontal)
self.sliderhspace = QtGui.QSlider(QtCore.Qt.Vertical)
# constraints
QtCore.QObject.connect( self.sliderleft,
QtCore.SIGNAL( "valueChanged(int)" ),
self.sliderright.setMinimum )
QtCore.QObject.connect( self.sliderright,
QtCore.SIGNAL( "valueChanged(int)" ),
self.sliderleft.setMaximum )
QtCore.QObject.connect( self.sliderbottom,
QtCore.SIGNAL( "valueChanged(int)" ),
self.slidertop.setMinimum )
QtCore.QObject.connect( self.slidertop,
QtCore.SIGNAL( "valueChanged(int)" ),
self.sliderbottom.setMaximum )
sliders = (self.sliderleft, self.sliderbottom, self.sliderright,
self.slidertop, self.sliderwspace, self.sliderhspace, )
adjustments = ('left:', 'bottom:', 'right:', 'top:', 'wspace:', 'hspace:')
for slider, adjustment in zip(sliders, adjustments):
slider.setMinimum(0)
slider.setMaximum(1000)
slider.setSingleStep(5)
layout = QtGui.QGridLayout()
leftlabel = QtGui.QLabel('left')
layout.addWidget(leftlabel, 2, 0)
layout.addWidget(self.sliderleft, 2, 1)
toplabel = QtGui.QLabel('top')
layout.addWidget(toplabel, 0, 2)
layout.addWidget(self.slidertop, 1, 2)
layout.setAlignment(self.slidertop, QtCore.Qt.AlignHCenter)
bottomlabel = QtGui.QLabel('bottom')
layout.addWidget(QtGui.QLabel('bottom'), 4, 2)
layout.addWidget(self.sliderbottom, 3, 2)
layout.setAlignment(self.sliderbottom, QtCore.Qt.AlignHCenter)
rightlabel = QtGui.QLabel('right')
layout.addWidget(rightlabel, 2, 4)
layout.addWidget(self.sliderright, 2, 3)
hspacelabel = QtGui.QLabel('hspace')
layout.addWidget(hspacelabel, 0, 6)
layout.setAlignment(hspacelabel, QtCore.Qt.AlignHCenter)
layout.addWidget(self.sliderhspace, 1, 6)
layout.setAlignment(self.sliderhspace, QtCore.Qt.AlignHCenter)
wspacelabel = QtGui.QLabel('wspace')
layout.addWidget(wspacelabel, 4, 6)
layout.setAlignment(wspacelabel, QtCore.Qt.AlignHCenter)
layout.addWidget(self.sliderwspace, 3, 6)
layout.setAlignment(self.sliderwspace, QtCore.Qt.AlignBottom)
layout.setRowStretch(1,1)
layout.setRowStretch(3,1)
layout.setColumnStretch(1,1)
layout.setColumnStretch(3,1)
layout.setColumnStretch(6,1)
self.setLayout(layout)
self.sliderleft.setSliderPosition(int(targetfig.subplotpars.left*1000))
self.sliderbottom.setSliderPosition(\
int(targetfig.subplotpars.bottom*1000))
self.sliderright.setSliderPosition(\
int(targetfig.subplotpars.right*1000))
self.slidertop.setSliderPosition(int(targetfig.subplotpars.top*1000))
self.sliderwspace.setSliderPosition(\
int(targetfig.subplotpars.wspace*1000))
self.sliderhspace.setSliderPosition(\
int(targetfig.subplotpars.hspace*1000))
QtCore.QObject.connect( self.sliderleft,
QtCore.SIGNAL( "valueChanged(int)" ),
self.funcleft )
QtCore.QObject.connect( self.sliderbottom,
QtCore.SIGNAL( "valueChanged(int)" ),
self.funcbottom )
QtCore.QObject.connect( self.sliderright,
QtCore.SIGNAL( "valueChanged(int)" ),
self.funcright )
QtCore.QObject.connect( self.slidertop,
QtCore.SIGNAL( "valueChanged(int)" ),
self.functop )
QtCore.QObject.connect( self.sliderwspace,
QtCore.SIGNAL( "valueChanged(int)" ),
self.funcwspace )
QtCore.QObject.connect( self.sliderhspace,
QtCore.SIGNAL( "valueChanged(int)" ),
self.funchspace )
def funcleft(self, val):
if val == self.sliderright.value():
val -= 1
self.targetfig.subplots_adjust(left=val/1000.)
if self.drawon: self.targetfig.canvas.draw()
def funcright(self, val):
if val == self.sliderleft.value():
val += 1
self.targetfig.subplots_adjust(right=val/1000.)
if self.drawon: self.targetfig.canvas.draw()
def funcbottom(self, val):
if val == self.slidertop.value():
val -= 1
self.targetfig.subplots_adjust(bottom=val/1000.)
if self.drawon: self.targetfig.canvas.draw()
def functop(self, val):
if val == self.sliderbottom.value():
val += 1
self.targetfig.subplots_adjust(top=val/1000.)
if self.drawon: self.targetfig.canvas.draw()
def funcwspace(self, val):
self.targetfig.subplots_adjust(wspace=val/1000.)
if self.drawon: self.targetfig.canvas.draw()
def funchspace(self, val):
self.targetfig.subplots_adjust(hspace=val/1000.)
if self.drawon: self.targetfig.canvas.draw()
def error_msg_qt( msg, parent=None ):
if not is_string_like( msg ):
msg = ','.join( map( str,msg ) )
QtGui.QMessageBox.warning( None, "Matplotlib", msg, QtGui.QMessageBox.Ok )
def exception_handler( type, value, tb ):
"""Handle uncaught exceptions
It does not catch SystemExit
"""
msg = ''
# get the filename attribute if available (for IOError)
if hasattr(value, 'filename') and value.filename != None:
msg = value.filename + ': '
if hasattr(value, 'strerror') and value.strerror != None:
msg += value.strerror
else:
msg += str(value)
if len( msg ) : error_msg_qt( msg )
FigureManager = FigureManagerQT
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