"""
ASAP plotting class based on matplotlib.
"""

from asap.asaplotbase import *
import Tkinter as Tk
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, \
	FigureManagerTkAgg
# Force use of the newfangled toolbar.
import matplotlib
matplotlib.use("TkAgg")
matplotlib.rcParams['toolbar'] = 'toolbar2'

class asaplotgui(asaplotbase):
    """
    ASAP plotting class based on matplotlib.
    """

    def __init__(self, rows=1, cols=0, title='', size=(8,6), buffering=False):
	"""
	Create a new instance of the ASAPlot plotting class.

	If rows < 1 then a separate call to set_panels() is required to define
	the panel layout; refer to the doctext for set_panels().
	"""
        v = vars()
        del v['self']

        asaplotbase.__init__(self, **v)
        self.window = Tk.Tk()
        def dest_callback():
            self.is_dead = True
            self.window.destroy()

        self.window.protocol("WM_DELETE_WINDOW", dest_callback)
        self.canvas = FigureCanvasTkAgg(self.figure, master=self.window)
        self.canvas.get_tk_widget().pack(side=Tk.TOP, fill=Tk.BOTH, expand=1)
        # Simply instantiating this is enough to get a working toolbar.
        self.figmgr = FigureManagerTkAgg(self.canvas, 1, self.window)
        self.window.wm_title('ASAP Plotter - Tk')

	self.events = {'button_press':None,
		       'button_release':None,
		       'motion_notify':None}

	matplotlib.rcParams["interactive"] = True
	#self.buffering = buffering

	self.canvas.show()

    def map(self):
	"""
	Reveal the ASAPlot graphics window and bring it to the top of the
	window stack.
	"""
	self.window.wm_deiconify()
	self.window.lift()

    def position(self):
	"""
	Use the mouse to get a position from a graph.
	"""

	def position_disable(event):
	    self.register('button_press', None)
	    print '%.4f, %.4f' % (event.xdata, event.ydata)

	print 'Press any mouse button...'
	self.register('button_press', position_disable)


    def quit(self):
	"""
	Destroy the ASAPlot graphics window.
	"""
	self.window.destroy()


    def region(self):
	"""
	Use the mouse to get a rectangular region from a plot.

	The return value is [x0, y0, x1, y1] in world coordinates.
	"""

	def region_start(event):
	    height = self.canvas.figure.bbox.height()
	    self.rect = {'fig': None, 'height': height,
			 'x': event.x, 'y': height - event.y,
			 'world': [event.xdata, event.ydata,
				   event.xdata, event.ydata]}
	    self.register('button_press', None)
	    self.register('motion_notify', region_draw)
	    self.register('button_release', region_disable)

	def region_draw(event):
	    self.canvas._tkcanvas.delete(self.rect['fig'])
	    self.rect['fig'] = self.canvas._tkcanvas.create_rectangle(
				self.rect['x'], self.rect['y'],
				event.x, self.rect['height'] - event.y)

	def region_disable(event):
	    self.register('motion_notify', None)
	    self.register('button_release', None)

	    self.canvas._tkcanvas.delete(self.rect['fig'])

	    self.rect['world'][2:4] = [event.xdata, event.ydata]
	    print '(%.2f, %.2f)  (%.2f, %.2f)' % (self.rect['world'][0],
		self.rect['world'][1], self.rect['world'][2],
		self.rect['world'][3])

	self.register('button_press', region_start)

	# This has to be modified to block and return the result (currently
	# printed by region_disable) when that becomes possible in matplotlib.

	return [0.0, 0.0, 0.0, 0.0]


    def register(self, type=None, func=None):
	"""
	Register, reregister, or deregister events of type 'button_press',
	'button_release', or 'motion_notify'.

	The specified callback function should have the following signature:

	    def func(event)

	where event is an MplEvent instance containing the following data:

	    name		# Event name.
	    canvas		# FigureCanvas instance generating the event.
	    x      = None	# x position - pixels from left of canvas.
	    y      = None	# y position - pixels from bottom of canvas.
	    button = None	# Button pressed: None, 1, 2, 3.
	    key    = None	# Key pressed: None, chr(range(255)), shift,
				  win, or control
	    inaxes = None	# Axes instance if cursor within axes.
	    xdata  = None	# x world coordinate.
	    ydata  = None	# y world coordinate.

	For example:

	    def mouse_move(event):
		print event.xdata, event.ydata

	    a = asaplot()
	    a.register('motion_notify', mouse_move)

	If func is None, the event is deregistered.

	Note that in TkAgg keyboard button presses don't generate an event.
	"""

	if not self.events.has_key(type): return

	if func is None:
	    if self.events[type] is not None:
		# It's not clear that this does anything.
		self.canvas.mpl_disconnect(self.events[type])
		self.events[type] = None

		# It seems to be necessary to return events to the toolbar.
		if type == 'motion_notify':
		    self.canvas.mpl_connect(type + '_event',
			self.figmgr.toolbar.mouse_move)
		elif type == 'button_press':
		    self.canvas.mpl_connect(type + '_event',
			self.figmgr.toolbar.press)
		elif type == 'button_release':
		    self.canvas.mpl_connect(type + '_event',
			self.figmgr.toolbar.release)

	else:
	    self.events[type] = self.canvas.mpl_connect(type + '_event', func)


    def show(self, hardrefresh=True):
	"""
	Show graphics dependent on the current buffering state.
	"""
	if not self.buffering:
            if hardrefresh:
                asaplotbase.show(self)
	    self.window.wm_deiconify()
	    self.canvas.show()

    def terminate(self):
	"""
	Clear the figure.
	"""
	self.window.destroy()

    def unmap(self):
	"""
	Hide the ASAPlot graphics window.
	"""
	self.window.wm_withdraw()
