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from __future__ import division
import math
import os
import sys
import matplotlib
from matplotlib import verbose
from matplotlib.numerix import asarray, fromstring, UInt8, zeros, \
where, transpose, nonzero, indices, ones, nx
import matplotlib.numerix as numerix
from matplotlib.cbook import is_string_like, enumerate, onetrue
from matplotlib.font_manager import fontManager
from matplotlib.backend_bases import RendererBase, GraphicsContextBase, \
FigureManagerBase, FigureCanvasBase, NavigationToolbar2, cursors
from matplotlib._pylab_helpers import Gcf
from matplotlib.figure import Figure
from matplotlib.mathtext import math_parse_s_ft2font
from matplotlib.widgets import SubplotTool
import qt
backend_version = "0.9.1"
def fn_name(): return sys._getframe(1).f_code.co_name
DEBUG = False
cursord = {
cursors.MOVE : qt.Qt.PointingHandCursor,
cursors.HAND : qt.Qt.WaitCursor,
cursors.POINTER : qt.Qt.ArrowCursor,
cursors.SELECT_REGION : qt.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()
def _create_qApp():
"""
Only one qApp can exist at a time, so check before creating one
"""
if qt.QApplication.startingUp():
if DEBUG: print "Starting up QApplication"
global qApp
qApp = qt.QApplication( [" "] )
qt.QObject.connect( qApp, qt.SIGNAL( "lastWindowClosed()" ),
qApp, qt.SLOT( "quit()" ) )
else:
# someone else aready created the qApp and
# we let them handle the event-loop control.
show._needmain = 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 ( show._needmain ):
qt.qApp.exec_loop()
show._needmain = False
show._needmain = True
def new_figure_manager( num, *args, **kwargs ):
"""
Create a new figure manager instance
"""
FigureClass = kwargs.pop('FigureClass', Figure)
thisFig = FigureClass( *args, **kwargs )
canvas = FigureCanvasQT( thisFig )
manager = FigureManagerQT( canvas, num )
return manager
class FigureCanvasQT( qt.QWidget, FigureCanvasBase ):
keyvald = { qt.Qt.Key_Control : 'control',
qt.Qt.Key_Shift : 'shift',
qt.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()
qt.QWidget.__init__( self, None, "QWidget figure" )
FigureCanvasBase.__init__( self, figure )
self.figure = figure
self.setMouseTracking( True )
w,h = self.get_width_height()
self.resize( w, h )
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'
self.draw()
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())
qt.QWidget.resizeEvent( self, event )
def resize( self, w, h ):
qt.QWidget.resize( self, w, h )
def _get_key( self, event ):
if event.key() < 256:
key = event.text().latin1()
elif self.keyvald.has_key( event.key() ):
key = self.keyvald[ event.key() ]
else:
key = None
return key
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 = qt.QMainWindow( None, None, qt.Qt.WDestructiveClose )
self.window.closeEvent = self._widgetCloseEvent
centralWidget = qt.QWidget( self.window )
self.canvas.reparent( centralWidget, qt.QPoint( 0, 0 ) )
# Give the keyboard focus to the figure instead of the manager
self.canvas.setFocusPolicy( qt.QWidget.ClickFocus )
self.canvas.setFocus()
self.window.setCaption( "Figure %d" % num )
self.window._destroying = False
self.toolbar = self._get_toolbar(self.canvas, centralWidget)
# Use a vertical layout for the plot and the toolbar. Set the
# stretch to all be in the plot so the toolbar doesn't resize.
self.layout = qt.QVBoxLayout( centralWidget )
self.layout.addWidget( self.canvas, 1 )
if self.toolbar:
self.layout.addWidget( self.toolbar, 0 )
self.window.setCentralWidget( centralWidget )
# Reset the window height so the canvas will be the right
# size. This ALMOST works right. The first issue is that the
# height w/ a toolbar seems to be off by just a little bit (so
# we add 4 pixels). The second is that the total width/height
# is slightly smaller that we actually want. It seems like
# the border of the window is being included in the size but
# AFAIK there is no way to get that size.
w = self.canvas.width()
h = self.canvas.height()
if self.toolbar:
h += self.toolbar.height() + 4
self.window.resize( w, h )
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 _widgetCloseEvent( self, event ):
self._widgetclosed()
qt.QWidget.closeEvent( self.window, event )
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 yet supported"
elif matplotlib.rcParams['toolbar'] == 'toolbar2':
toolbar = NavigationToolbar2QT(canvas, parent)
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
if DEBUG: print "destroy figure manager"
self.window.close(True)
class NavigationToolbar2QT( NavigationToolbar2, qt.QWidget ):
# list of toolitems to add to the toolbar, format is:
# text, tooltip_text, image_file, callback(str)
toolitems = (
('Home', 'Reset original view', 'home.ppm', 'home'),
('Back', 'Back to previous view','back.ppm', 'back'),
('Forward', 'Forward to next view','forward.ppm', 'forward'),
(None, None, None, None),
('Pan', 'Pan axes with left mouse, zoom with right', 'move.ppm', 'pan'),
('Zoom', 'Zoom to rectangle','zoom_to_rect.ppm', 'zoom'),
(None, None, None, None),
('Subplots', 'Configure subplots','subplots.png', 'configure_subplots'),
('Save', 'Save the figure','filesave.ppm', 'save_figure'),
)
def __init__( self, canvas, parent ):
self.canvas = canvas
self.buttons = {}
qt.QWidget.__init__( self, parent )
# Layout toolbar buttons horizontally.
self.layout = qt.QHBoxLayout( self )
self.layout.setMargin( 2 )
NavigationToolbar2.__init__( self, canvas )
def _init_toolbar( self ):
basedir = os.path.join(matplotlib.rcParams[ 'datapath' ],'images')
for text, tooltip_text, image_file, callback in self.toolitems:
if text == None:
self.layout.addSpacing( 8 )
continue
fname = os.path.join( basedir, image_file )
image = qt.QPixmap()
image.load( fname )
button = qt.QPushButton( qt.QIconSet( image ), "", self )
qt.QToolTip.add( button, tooltip_text )
self.buttons[ text ] = button
# The automatic layout doesn't look that good - it's too close
# to the images so add a margin around it.
margin = 4
button.setFixedSize( image.width()+margin, image.height()+margin )
qt.QObject.connect( button, qt.SIGNAL( 'clicked()' ),
getattr( self, callback ) )
self.layout.addWidget( button )
self.buttons[ 'Pan' ].setToggleButton( True )
self.buttons[ 'Zoom' ].setToggleButton( True )
# 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.
self.locLabel = qt.QLabel( "", self )
self.locLabel.setAlignment( qt.Qt.AlignRight | qt.Qt.AlignVCenter )
self.locLabel.setSizePolicy(qt.QSizePolicy(qt.QSizePolicy.Ignored,
qt.QSizePolicy.Ignored))
self.layout.addWidget( self.locLabel, 1 )
# reference holder for subplots_adjust window
self.adj_window = None
def pan( self, *args ):
self.buttons[ 'Zoom' ].setOn( False )
NavigationToolbar2.pan( self, *args )
def zoom( self, *args ):
self.buttons[ 'Pan' ].setOn( False )
NavigationToolbar2.zoom( self, *args )
def dynamic_update( self ):
self.canvas.draw()
def set_message( self, s ):
self.locLabel.setText( s )
def set_cursor( self, cursor ):
if DEBUG: print 'Set cursor' , cursor
qt.QApplication.restoreOverrideCursor()
qt.QApplication.setOverrideCursor( qt.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 = qt.QMainWindow(None, None, qt.Qt.WDestructiveClose)
win = self.adj_window
win.setCaption("Subplot Configuration Tool")
toolfig = Figure(figsize=(6,3))
toolfig.subplots_adjust(top=0.9)
w = int (toolfig.bbox.width())
h = int (toolfig.bbox.height())
canvas = self._get_canvas(toolfig)
tool = SubplotTool(self.canvas.figure, toolfig)
centralWidget = qt.QWidget(win)
canvas.reparent(centralWidget, qt.QPoint(0, 0))
win.setCentralWidget(centralWidget)
layout = qt.QVBoxLayout(centralWidget)
layout.addWidget(canvas, 1)
win.resize(w, h)
canvas.setFocus()
win.show()
def _get_canvas(self, fig):
return FigureCanvasQT(fig)
def save_figure( self ):
fname = qt.QFileDialog.getSaveFileName()
if fname:
self.canvas.print_figure( fname.latin1() )
def set_history_buttons( self ):
canBackward = ( self._views._pos > 0 )
canForward = ( self._views._pos < len( self._views._elements ) - 1 )
self.buttons[ 'Back' ].setEnabled( canBackward )
self.buttons[ 'Forward' ].setEnabled( canForward )
# set icon used when windows are minimized
try:
# TODO: This is badly broken
qt.window_set_default_icon_from_file (
os.path.join( matplotlib.rcParams['datapath'], 'images', 'matplotlib.svg' ) )
except:
verbose.report( 'Could not load matplotlib icon: %s' % sys.exc_info()[1] )
def error_msg_qt( msg, parent=None ):
if not is_string_like( msg ):
msg = ','.join( map( str,msg ) )
qt.QMessageBox.warning( None, "Matplotlib", msg, qt.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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