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backend_tkagg.py

# Todd Miller   jmiller@stsci.edu

from __future__ import division

import os, sys, math

import Tkinter as Tk, FileDialog
import tkagg                 # Paint image to Tk photo blitter extension
from backend_agg import FigureCanvasAgg

import os.path

import matplotlib
from matplotlib.cbook import is_string_like,  enumerate
from matplotlib.backend_bases import RendererBase, GraphicsContextBase, \
     FigureManagerBase, FigureCanvasBase, NavigationToolbar2, cursors

from matplotlib.figure import Figure
from matplotlib._pylab_helpers import Gcf
from matplotlib.numerix import asarray

import matplotlib.windowing as windowing
from matplotlib.widgets import SubplotTool

rcParams = matplotlib.rcParams
verbose = matplotlib.verbose


backend_version = Tk.TkVersion

# the true dots per inch on the screen; should be display dependent
# see http://groups.google.com/groups?q=screen+dpi+x11&hl=en&lr=&ie=UTF-8&oe=UTF-8&safe=off&selm=7077.26e81ad5%40swift.cs.tcd.ie&rnum=5 for some info about screen dpi
PIXELS_PER_INCH = 75

cursord = {
    cursors.MOVE: "fleur",    
    cursors.HAND: "hand2",
    cursors.POINTER: "arrow",
    cursors.SELECT_REGION: "tcross",
    }

def round(x):
    return int(math.floor(x+0.5))

def raise_msg_to_str(msg):
    """msg is a return arg from a raise.  Join with new lines"""
    if not is_string_like(msg):
        msg = '\n'.join(map(str, msg))
    return msg
    
def error_msg_tkpaint(msg, parent=None):
    import tkMessageBox
    tkMessageBox.showerror("matplotlib", msg)

def draw_if_interactive():
    if matplotlib.is_interactive():
        figManager =  Gcf.get_active()
        if figManager is not None:
            figManager.show()
        

def show():
    """
    Show all the figures and enter the gtk mainloop

    This should be the last line of your script
    """
    for manager in Gcf.get_all_fig_managers():
        manager.show()
    import matplotlib
    matplotlib.interactive(True)
    if rcParams['tk.pythoninspect']:
        os.environ['PYTHONINSPECT'] = '1'
    if show._needmain:
        Tk.mainloop()
        show._needmain = False
show._needmain = True

def new_figure_manager(num, *args, **kwargs):
    """
    Create a new figure manager instance
    """
    _focus = windowing.FocusManager()
    figure = Figure(*args, **kwargs)
    window = Tk.Tk()
    canvas = FigureCanvasTkAgg(figure, master=window)    
    figManager = FigureManagerTkAgg(canvas, num, window)
    if matplotlib.is_interactive():
        figManager.show()
    return figManager


class FigureCanvasTkAgg(FigureCanvasAgg):
    keyvald = {65507 : 'control',
               65505 : 'shift',
               65513 : 'alt',
               65508 : 'control',
               65506 : 'shift',
               65514 : 'alt',
               65361 : 'left',
               65362 : 'up',
               65363 : 'right',
               65364 : 'down',
               }

    def __init__(self, figure, master=None, resize_callback=None):
        FigureCanvasAgg.__init__(self, figure)
        self._idle = True
        t1,t2,w,h = self.figure.bbox.get_bounds()
        w, h = int(w), int(h)
        self._tkcanvas = Tk.Canvas(
            master=master, width=w, height=h, borderwidth=4)
        self._tkphoto = Tk.PhotoImage(
            master=self._tkcanvas, width=w, height=h)
        self._tkcanvas.create_image(w/2, h/2, image=self._tkphoto)
        self._resize_callback = resize_callback
        self._tkcanvas.bind("<Configure>", self.resize)
        self._tkcanvas.bind("<Key>", self.key_press)
        self._tkcanvas.bind("<Motion>", self.motion_notify_event)        
        self._tkcanvas.bind("<KeyRelease>", self.key_release)
        for name in "<Button-1>", "<Button-2>", "<Button-3>":
            self._tkcanvas.bind(name, self.button_press_event)

        for name in "<ButtonRelease-1>", "<ButtonRelease-2>", "<ButtonRelease-3>":
            self._tkcanvas.bind(name, self.button_release_event)
            
        self._master = master
        self._tkcanvas.focus_set()

        
    def resize(self, event):
        width, height = event.width, event.height
        if self._resize_callback is not None:
            self._resize_callback(event)

        # compute desired figure size in inches
        dpival = self.figure.dpi.get()
        winch = width/dpival
        hinch = height/dpival
        self.figure.set_figsize_inches(winch, hinch)


        self._tkphoto.configure(width=width, height=height)
        self._tkcanvas.delete(self._tkphoto)
        self._tkphoto = Tk.PhotoImage(
            master=self._tkcanvas, width=width, height=height)
        self._tkcanvas.create_image(width/2,height/2,image=self._tkphoto)
        self.show()

    def draw(self):
        FigureCanvasAgg.draw(self)
        tkagg.blit(self._tkphoto, self.renderer._renderer, 2)
        self._master.update_idletasks()

    show = draw

    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: self._tkcanvas.after_idle(idle_draw)

    def get_tk_widget(self):
        """returns the Tk widget used to implement FigureCanvasTkAgg.
        Although the initial implementation uses a Tk canvas,  this routine
        is intended to hide that fact.
        """
        return self._tkcanvas

    def print_figure(self, filename, dpi=150,
                     facecolor='w', edgecolor='w',
                     orientation='portrait'):

        agg = self.switch_backends(FigureCanvasAgg)
        agg.print_figure(filename, dpi, facecolor, edgecolor, orientation)
        self.figure.set_canvas(self)

    def motion_notify_event(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, guiEvent=event)

    def button_press_event(self, event):
        x = event.x
        # flipy so y=0 is bottom of canvas
        y = self.figure.bbox.height() - event.y
        num = getattr(event, 'num', None)

        if sys.platform=='darwin':
            # 2 and 3 were reversed on the OSX platform I
            # tested under tkagg
            if   num==2: num=3
            elif num==3: num=2

        FigureCanvasBase.button_press_event(self, x, y, num, guiEvent=event)

    def button_release_event(self, event):
        x = event.x
        # flipy so y=0 is bottom of canvas
        y = self.figure.bbox.height() - event.y

        num = getattr(event, 'num', None)

        if sys.platform=='darwin':
            # 2 and 3 were reversed on the OSX platform I
            # tested under tkagg
            if   num==2: num=3
            elif num==3: num=2

        FigureCanvasBase.button_release_event(self, x, y, num, guiEvent=event)

    def _get_key(self, event):
        val = event.keysym_num
        if self.keyvald.has_key(val):
            key = self.keyvald[val]
        elif val<256:
            key = chr(val)
        else:
            key = None
        return key

        
    def key_press(self, event):
        key = self._get_key(event)
        FigureCanvasBase.key_press_event(self, key, guiEvent=event)        

    def key_release(self, event):
        key = self._get_key(event)
        FigureCanvasBase.key_release_event(self, key, guiEvent=event)        


    
00238 class FigureManagerTkAgg(FigureManagerBase):
    """
    Public attributes

    canvas      : The FigureCanvas instance
    num         : The Figure number
    toolbar     : The tk.Toolbar
    window      : The tk.Window
    """
    def __init__(self, canvas, num, window):
        FigureManagerBase.__init__(self, canvas, num)        
        self.window = window
        self.window.withdraw()
        self.window.wm_title("Figure %d" % num)
        self.canvas = canvas
        self._num =  num
        t1,t2,w,h = canvas.figure.bbox.get_bounds()
        w, h = int(w), int(h)
        self.window.minsize(int(w*3/4),int(h*3/4))
        if matplotlib.rcParams['toolbar']=='classic':
            self.toolbar = NavigationToolbar( canvas, self.window )
        elif matplotlib.rcParams['toolbar']=='toolbar2':
            self.toolbar = NavigationToolbar2TkAgg( canvas, self.window )
        else:
            self.toolbar = None
        if self.toolbar is not None:
            self.toolbar.update()
        self.canvas._tkcanvas.pack(side=Tk.TOP, fill=Tk.BOTH, expand=1)
        self._shown = False

        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 resize(self, event):
        width, height = event.width, event.height
        self.toolbar.configure(width=width) # , height=height)


00279     def show(self):
        """
        this function doesn't segfault but causes the
        PyEval_RestoreThread: NULL state bug on win32
        """

        def destroy(*args):
            self.window = None
            Gcf.destroy(self._num)
            
        if not self._shown: self.window.bind("<Destroy>", destroy)

        _focus = windowing.FocusManager()
        if not self._shown:
            self.window.deiconify()
            # anim.py requires this
            if sys.platform=='win32' : self.window.update()            
        else:
            self.canvas.draw()
        self._shown = True


    def destroy(self, *args):
        if Gcf.get_num_fig_managers()==0 and not matplotlib.is_interactive():
            if self.window is not None:
                self.window.quit()
        if self.window is not None:
            #print 'calling window destroy'
            self.window.destroy()
            pass
        self.window = None

class AxisMenu:
    def __init__(self, master, naxes):
        self._master = master
        self._naxes = naxes
        self._mbar = Tk.Frame(master=master, relief=Tk.RAISED, borderwidth=2)
        self._mbar.pack(side=Tk.LEFT)
        self._mbutton = Tk.Menubutton(
            master=self._mbar, text="Axes", underline=0)
        self._mbutton.pack(side=Tk.LEFT, padx="2m")
        self._mbutton.menu = Tk.Menu(self._mbutton)
        self._mbutton.menu.add_command(
            label="Select All", command=self.select_all)
        self._mbutton.menu.add_command(
            label="Invert All", command=self.invert_all)
        self._axis_var = []
        self._checkbutton = []
        for i in range(naxes):
            self._axis_var.append(Tk.IntVar())
            self._axis_var[i].set(1)
            self._checkbutton.append(self._mbutton.menu.add_checkbutton(
                label = "Axis %d" % (i+1),
                variable=self._axis_var[i],
                command=self.set_active))
            self._mbutton.menu.invoke(self._mbutton.menu.index("Select All"))
        self._mbutton['menu'] = self._mbutton.menu
        self._mbar.tk_menuBar(self._mbutton)
        self.set_active()

    def adjust(self, naxes):
        if self._naxes < naxes:
            for i in range(self._naxes, naxes):
                self._axis_var.append(Tk.IntVar())
                self._axis_var[i].set(1)
                self._checkbutton.append( self._mbutton.menu.add_checkbutton(
                    label = "Axis %d" % (i+1),
                    variable=self._axis_var[i],
                    command=self.set_active))
        elif self._naxes > naxes:
            for i in range(self._naxes-1, naxes-1, -1):
                del self._axis_var[i]
                self._mbutton.menu.forget(self._checkbutton[i])
                del self._checkbutton[i]
        self._naxes = naxes
        self.set_active()

    def get_indices(self):
        a = [i for i in range(len(self._axis_var)) if self._axis_var[i].get()]
        return a

    def set_active(self):
        self._master.set_active(self.get_indices())

    def invert_all(self):
        for a in self._axis_var:
            a.set(not a.get())
        self.set_active()

    def select_all(self):
        for a in self._axis_var:
            a.set(1)
        self.set_active()

00373 class NavigationToolbar(Tk.Frame):
    """
    Public attriubutes

      canvas   - the FigureCanvas  (gtk.DrawingArea)
      win   - the gtk.Window

    """
    def _Button(self, text, file, command):
        file = os.path.join(rcParams['datapath'], file)
        im = Tk.PhotoImage(master=self, file=file)
        b = Tk.Button(
            master=self, text=text, padx=2, pady=2, image=im, command=command)
        b._ntimage = im
        b.pack(side=Tk.LEFT)
        return b
            
    def __init__(self, canvas, window):
        self.canvas = canvas
        self.window = window
        
        xmin, xmax = canvas.figure.bbox.intervalx().get_bounds()
        height, width = 50, xmax-xmin
        Tk.Frame.__init__(self, master=self.window,
                          width=width, height=height,
                          borderwidth=2)

        self.update()  # Make axes menu

        self.bLeft = self._Button(
            text="Left", file="stock_left.ppm",
            command=lambda x=-1: self.panx(x))

        self.bRight = self._Button(
            text="Right", file="stock_right.ppm",
            command=lambda x=1: self.panx(x))

        self.bZoomInX = self._Button(
            text="ZoomInX",file="stock_zoom-in.ppm",
            command=lambda x=1: self.zoomx(x))
        
        self.bZoomOutX = self._Button(
            text="ZoomOutX", file="stock_zoom-out.ppm",
            command=lambda x=-1: self.zoomx(x))

        self.bUp = self._Button(
            text="Up", file="stock_up.ppm",
            command=lambda y=1: self.pany(y))
        
        self.bDown = self._Button(
            text="Down", file="stock_down.ppm",
            command=lambda y=-1: self.pany(y))

        self.bZoomInY = self._Button(
            text="ZoomInY", file="stock_zoom-in.ppm",
            command=lambda y=1: self.zoomy(y))

        self.bZoomOutY = self._Button(
            text="ZoomOutY",file="stock_zoom-out.ppm",
            command=lambda y=-1: self.zoomy(y))
        
        self.bSave = self._Button(
            text="Save", file="stock_save_as.ppm",
            command=self.save_figure)

        self.pack(side=Tk.BOTTOM, fill=Tk.X)
        
        
    def set_active(self, ind):
        self._ind = ind
        self._active = [ self._axes[i] for i in self._ind ]

    def panx(self, arg):
        try: arg.direction
        except AttributeError: direction = arg
        else:
            if arg.direction == Tk.SCROLL_UP: direction=1
            else: direction=-1
        for a in self._active:
            a.panx(direction)
        self.canvas.draw()

    def pany(self, arg):
        try: arg.direction
        except AttributeError: direction = arg
        else:
            if arg.direction == Tk.SCROLL_UP: direction=1
            else: direction=-1
        for a in self._active:
            a.pany(direction)
        self.canvas.draw()

    def zoomx(self, arg):
        try: arg.direction
        except AttributeError: direction = arg
        else:            
            if arg.direction == Tk.SCROLL_UP: direction=1
            else: direction=-1

        for a in self._active:
            a.zoomx(direction)
        self.canvas.draw()

    def zoomy(self, arg):
        try: arg.direction
        except AttributeError: direction = arg
        else:
            if arg.direction == Tk.SCROLL_UP: direction=1
            else: direction=-1

        for a in self._active:
            a.zoomy(direction)
        self.canvas.draw()

    def save_figure(self):
        fs = FileDialog.SaveFileDialog(master=self.window,
                                       title='Save the figure')
        try:
            self.lastDir
        except AttributeError:
            self.lastDir = os.curdir
            
        fname = fs.go(dir_or_file=self.lastDir) # , pattern="*.png")
        if fname is None: # Cancel
            return
        
        self.lastDir = os.path.dirname(fname)
        try:
            self.canvas.print_figure(fname)
        except IOError, msg:                
            err = '\n'.join(map(str, msg))
            msg = 'Failed to save %s: Error msg was\n\n%s' % (
                fname, err)
            error_msg_tkpaint(msg)

    def update(self):
        _focus = windowing.FocusManager()
        self._axes = self.canvas.figure.axes
        naxes = len(self._axes)
        if not hasattr(self, "omenu"):
            self.set_active(range(naxes))
            self.omenu = AxisMenu(master=self, naxes=naxes)
        else:
            self.omenu.adjust(naxes)

00518 class NavigationToolbar2TkAgg(NavigationToolbar2, Tk.Frame):
    """
    Public attriubutes

      canvas   - the FigureCanvas  (gtk.DrawingArea)
      win   - the gtk.Window
    """
    def __init__(self, canvas, window):
        self.canvas = canvas
        self.window = window
        self._idle = True
        Tk.Frame.__init__(self, master=self.canvas._tkcanvas)
        NavigationToolbar2.__init__(self, canvas)
        
    def set_message(self, s):
        self.message.set(s)

    def draw_rubberband(self, event, x0, y0, x1, y1):
        height = self.canvas.figure.bbox.height()
        y0 =  height-y0
        y1 =  height-y1
        try: self.lastrect
        except AttributeError: pass
        else: self.canvas._tkcanvas.delete(self.lastrect)
        self.lastrect = self.canvas._tkcanvas.create_rectangle(x0, y0, x1, y1)

        #self.canvas.draw()

    def release(self, event):
        try: self.lastrect
        except AttributeError: pass
        else:
            self.canvas._tkcanvas.delete(self.lastrect)
            del self.lastrect

    def set_cursor(self, cursor):
        self.window.configure(cursor=cursord[cursor])
    
    def _Button(self, text, file, command):
        file = os.path.join(rcParams['datapath'], file)
        im = Tk.PhotoImage(master=self, file=file)
        b = Tk.Button(
            master=self, text=text, padx=2, pady=2, image=im, command=command)
        b._ntimage = im
        b.pack(side=Tk.LEFT)
        return b

    def _init_toolbar(self):
        xmin, xmax = self.canvas.figure.bbox.intervalx().get_bounds()
        height, width = 50, xmax-xmin
        Tk.Frame.__init__(self, master=self.window,
                          width=width, height=height,
                          borderwidth=2)
        
        self.update()  # Make axes menu

        self.bHome = self._Button( text="Home", file="home.ppm",
                                   command=self.home)

        self.bBack = self._Button( text="Back", file="back.ppm",
                                   command = self.back)
        
        self.bForward = self._Button(text="Forward", file="forward.ppm",
                                     command = self.forward)

        self.bPan = self._Button( text="Pan", file="move.ppm",
                                  command = self.pan)

        self.bZoom = self._Button( text="Zoom",
                                   file="zoom_to_rect.ppm",
                                   command = self.zoom)

        self.bsubplot = self._Button( text="Configure Subplots", file="subplots.ppm",
                                   command = self.configure_subplots)

        self.bsave = self._Button( text="Save", file="filesave.ppm",
                                   command = self.save_figure)
        self.message = Tk.StringVar(master=self)
        self._message_label = Tk.Label(master=self, textvariable=self.message)
        self._message_label.pack(side=Tk.RIGHT)
        self.pack(side=Tk.BOTTOM, fill=Tk.X)


    def configure_subplots(self):
        toolfig = Figure(figsize=(6,3))
        window = Tk.Tk()
        canvas = FigureCanvasTkAgg(toolfig, master=window)    
        toolfig.subplots_adjust(top=0.9)
        tool =  SubplotTool(self.canvas.figure, toolfig)
        canvas.show()
        canvas.get_tk_widget().pack(side=Tk.TOP, fill=Tk.BOTH, expand=1)

    def save_figure(self):
        fs = FileDialog.SaveFileDialog(master=self.window,
                                       title='Save the figure')
        try:
            self.lastDir
        except AttributeError:
            self.lastDir = os.curdir
            
        fname = fs.go(dir_or_file=self.lastDir) # , pattern="*.png")
        if fname is None: # Cancel
            return
        
        self.lastDir = os.path.dirname(fname)
        try:
            self.canvas.print_figure(fname)
        except IOError, msg:                
            err = '\n'.join(map(str, msg))
            msg = 'Failed to save %s: Error msg was\n\n%s' % (
                fname, err)
            error_msg_tkpaint(msg)

    def set_active(self, ind):
        self._ind = ind
        self._active = [ self._axes[i] for i in self._ind ]

    def update(self):
        _focus = windowing.FocusManager()
        self._axes = self.canvas.figure.axes
        naxes = len(self._axes)
        #if not hasattr(self, "omenu"):
        #    self.set_active(range(naxes))
        #    self.omenu = AxisMenu(master=self, naxes=naxes)
        #else:
        #    self.omenu.adjust(naxes)
        NavigationToolbar2.update(self)

    def dynamic_update(self):
        'update drawing area only if idle'
        # legacy method; new method is canvas.draw_idle
        self.canvas.draw_idle()


FigureManager = FigureManagerTkAgg


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