h1. Content
{toc}

h1. Parsing of input parameters

h3. Parsing "on knees"
{code}
import sys
import os

def get_input_parameters() :
    nargs = len(sys.argv)
    print 'sys.argv[0]: ', sys.argv[0]
    print 'nargs: ', nargs
    # Then do something with arguments...
{code}

h3. Use OptionParser
{code}

from optparse import OptionParser

def input_option_parser() :

    def_fname = 'spec-xppi0412-r0060-20120507-125420.198726277.txt'
    def_cols = 100

    parser = OptionParser(description='Process optional input parameters.', usage = "usage: %prog [options]")
    parser.add_option('-f', '--fname', dest='fname', default=def_fname, action='store', type='string', help='input file name')
    parser.add_option('-c', '--cols', dest='cols', default=def_cols, action='store', type='int', help='number of columns in the image array')
    parser.add_option('-v', dest='verbose', action='store_true',  help='set flag to print more details',  default=True)
    parser.add_option('-q', dest='verbose', action='store_false', help='set flag to print less details')
    (opts, args) = parser.parse_args()

    print 'opts:',opts
    print 'args:',args

    return (opts, args)

{code}

h1. Manipulation with directories and files

h3. Access to files in the derectory
{code}
def getListOfFilesInDir(dirname) :
    return os.listdir(dirname)

def printListOfFilesInDir(dirname) :
    print 'List of files in the dir.', dirname
    for name in os.listdir(dirname) :
        print name
    print '\n'

{code}

h3. Parsing the pathname

{code}
        root, ext = os.path.splitext(path) # i.e. path='root-part.tail-part'
        basename  = os.path.basename(path)
        dirname   = os.path.dirname(path)
        lexist    = os.path.lexists(path)
        isfile    = os.path.isfile(path)
        isdir     = os.path.isdir(path)
        head, tail= os.path.split(path)    # i.e. path='head-part/tail-part'
...
{code}
[

{close}


h3. How to close window and delete object?
{close}
    def closeEvent(self, event):
        try: # try to delete self object in the cp.confpars
            del cp.confpars.guiconfigparameters 
        except # AttributeError:
            pass # silently ignore
{close}






h1. Matplotlib

In examples below we assume
{code}

axes = fig.add_subplot(111)
axim = axes.imshow(arrwin, interpolation='nearest', origin='bottom', aspect='auto')

{code}

h3. How to define empty axes with limits
{code}
fig   = plt.figure(figsize=(10,10), dpi=100, facecolor='w',edgecolor='w',frameon=True)
axes  = fig.add_subplot(111)        
axes.set_xlim((-50,1750))
axes.set_ylim((-50,1750))

{code}


h3. How to draw line
{code}
import matplotlib.lines  as lines
line = lines.Line2D(arrx, arry, linewidth=1, color='r')   
axes.add_artist(line)
{code}



h3. How to draw axis without labels
{code

}
import matplotlib.ticker as mtick
axes.xaxis.set_major_formatter( mtick.NullFormatter() )

{code}

h3. How to rotate axis labels
{code}
for label in axes.get_xticklabels() :
    label.set_rotation(60)                  # rotate by 60 degree
    label.set_horizontalalignment('center') # 'right', etc.
{code}




h3. How to change axis label position on the plot
{code}

axes.xaxis.set_ticks_position('top')
axes.yaxis.set_ticks_position('right')
{code}


h3. How to make figure with 

axCB = fig.add_subplot(gs[ 0, 0:14])
colb = fig.colorbar(axim, cax=axCB, orientation='horizontal')
axCB.xaxis.set_ticks_position('top') # change position of axis labels
{code}

h3. How draw text
{code}

plt.text(x, y, text, fontsize=7, color='k', ha='left', rotation=45)

{code}






h1. At the edge of matplotlib and PyQt4
We assume that everything is done in our backend basis:
{code}
import matplotlib
matplotlib.use('Qt4Agg')
import matplotlib.pyplot as plt
{code}


h3. How to get the current matplotlib figure window position on monitor
{code}

pos = fig.canvas.manager.window.pos()
print 'x,y=', pos.x(), pos.y()
{code}


h3. How to move the matplotlib figure window in certain 

 matplotlib figure window on top (of all pileup windows)

{code}
fig.canvas.manager.window.activateWindow() # Makes window active
fig.canvas.manager.window.raise_()         # Moves window on top
{code}

h3. How to add figure as a widget of the QtGui
{code}
fig = plt.figure(num=None figsize=(5,10), dpi=100, facecolor='w',edgecolor='w',frameon=True)
vbox = QtGui.QVBoxLayout()
vbox.addWidget(fig.canvas)    # Wraps figure canvas in widget 
self.setLayout(vbox)
{code}

h3. How to receive a signal 

in program when window is activated by the mouse click on frame ?

I do not know yet...

But, if you click on figure canvas (the region inside the window frame, use

{code}
        fig.canvas.mpl_connect('button_press_event', self.onButtonPressEvent) 

#Should be implemented something like:
    def onButtonPressEvent( self, event ):
        """Figure is picked"""
        print 'click on fig number =', event.canvas.figure.number

{code}

h3. How to receive a signal in program when close window by the click on "X"

{code}
        fig.canvas.mpl_connect('close_event', self.onCloseEvent)

#Should be implemented something like:
    def onCloseEvent( self, event ):
        print 'close event, fig number =', event.canvas.figure.number

{code}

h3. How to close figure from program call
{code}
plt.close( num ) # close figure with known number num
...
plt.close('all') # close all figures
{code}