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Division of plots -> view/plots

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This commit is contained in:
Arnar Flatberg 2007-02-27 16:27:39 +00:00
parent bf1ad1be87
commit 059cddbc16
1 changed files with 984 additions and 0 deletions
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import pygtk
import gobject
import gtk
from matplotlib.patches import Polygon,Rectangle
from matplotlib.lines import Line2D
import fluents
import logger
# global active mode. Used by toolbars to communicate correct mode
active_mode = 'default'
class ObjectTable:
"""A 2D table of elements.
An ObjectTable is a resizable two-dimensional array of objects.
When resized, it will keep all the elements that fit in the new shape,
and forget about other elements. When new elements are needed to fill
out the new shape, they will be created.
"""
def __init__(self, xsize=0, ysize=0, creator=None):
"""Creates a two-dimensional table of objects.
@param xsize: Width of the object table.
@param ysize: Height of the object table.
@param creator: A function that will be used to instantiate new items.
"""
self._elements = []
self._creator = creator or (lambda : None)
self.xsize = xsize
self.ysize = ysize
self.resize(xsize, ysize)
def resize(self, xsize, ysize):
"""Resizes the table by removing and creating elements as required.
Makes the ObjectTable the specified size by removing elements that
will not fit in the new shape and appending elements to fill the
table. New elements will be created with the creator function passed
as an argument to __init__.
@param xsize: The new width.
@type xsize: int
@param ysize: The new height.
@type ysize: int
"""
# Delete or append new rows
del self._elements[ysize:]
new_rows = ysize - len(self._elements)
self._elements.extend([list() for i in range(new_rows)])
# Delete or append new columns
for row in self._elements:
del row[xsize:]
new_elems = xsize - len(row)
row.extend([self._creator() for i in range(new_elems)])
self.xsize = xsize
self.ysize = ysize
def __getitem__(self, index):
x, y = index
return self._elements[y][x]
def __setitem__(self, index, value):
x, y = index
self._elements[y][x] = value
class ViewFrame (gtk.Frame):
"""
A ViewFrame is a gtk container widget that contains a View.
The ViewFrame is either active or inactive, and belongs to a group of
VeiwFrames of which only one can be active at any time.
"""
def __init__(self, view_frames):
"""Initializes a new ViewFrame.
@param view_frames: A list of view frames to which the new view
frame shouls belong. Only one ViewFrame in this list can be
active at any time.
"""
gtk.Frame.__init__(self)
self.focused = False
self.view_frames = view_frames
self.empty_view = EmptyView()
self._button_event = None
## Set up a VBox with a label wrapped in an event box.
label = gtk.Label()
ebox = gtk.EventBox()
ebox.add(label)
vbox = gtk.VBox()
vbox.pack_start(ebox, expand=False)
vbox.pack_start(gtk.HSeparator(), expand=False)
self._ebox_button_event = ebox.connect("button-press-event",
self._on_button_press_event)
## Keep the references for later use.
self._vbox = vbox
self._ebox = ebox
self._view_title = label
self.add(vbox)
view_frames.append(self)
if len(view_frames) == 1:
self.focus()
else:
self.focused = True
self.unfocus()
# Get dropped views
self.drag_dest_set(gtk.DEST_DEFAULT_ALL,
[("GTK_TREE_MODEL_ROW", gtk.TARGET_SAME_APP, 7)],
gtk.gdk.ACTION_LINK)
self.connect("drag-data-received", self.on_drag_data_received)
# Set view
self._view = self.empty_view
self._view.connect("button-press-event", self._on_button_press_event)
self._vbox.add(self._view)
self._view_title.set_text(self._view.title)
self.show_all()
self._view.show()
def focus(self):
"""Gets focus and ensures that no other ViewFrame in the same set
is in focus.
"""
if self.focused:
self.emit('focus-changed', self, True)
return self
for frame in self.view_frames:
frame.unfocus()
self.set_shadow_type(gtk.SHADOW_IN)
self._ebox.set_state(gtk.STATE_ACTIVE)
self.focused = True
self.emit('focus-changed', self, True)
return self
def unfocus(self):
"""Removes focus from the ViewFrame. Does nothing if unfocused."""
if not self.focused:
return
self.set_shadow_type(gtk.SHADOW_OUT)
self._ebox.set_state(gtk.STATE_NORMAL)
self.focused = False
self.emit('focus-changed', self, False)
def set_view(self, view):
"""Set view to view or to empty view if parameter is None
@param view: An instance of View
"""
# if None is passed, use empty view
if view == None:
view = self.empty_view
# do nothing if the view is already there
if view == self._view:
return
# detach view from current parent
if view._view_frame:
view._view_frame.set_view(None)
# switch which widget we are listening to
if self._button_event:
self._view.disconnect(self._button_event)
self._button_event = view.connect("button-press-event",
self._on_button_press_event)
# remove old view, set new view
if self._view:
self._view.hide()
self._vbox.remove(self._view)
self._view._view_frame = None
self._view_title.set_text(view.title)
self._vbox.add(view)
view.show()
view._view_frame = self
self._view = view
def get_view(self):
"""Returns current view, or None if the empty view is set.
@returns: None if the ViewFrame is currently displaying it's
EmptyView. Otherwise it returns the currently displeyd View.
"""
if self._view == self.empty_view:
return None
return self._view
def _on_button_press_event(self, widget, event):
if not self.focused:
self.focus()
def on_drag_data_received(self, widget, drag_context, x, y,
selection, info, timestamp):
treestore, path = selection.tree_get_row_drag_data()
iter = treestore.get_iter(path)
obj = treestore.get_value(iter, 2)
if isinstance(obj, View):
self.set_view(obj)
self.focus()
elif isinstance(obj, fluents.dataset.Dataset):
view = self.get_view()
if view.is_mappable_with(obj):
view._update_color_from_dataset(obj)
elif isinstance(obj, fluents.dataset.Selection):
view = self.get_view()
if view.is_mappable_with(obj):
view.selection_changed(self.current_dim, obj)
class MainView (gtk.Notebook):
"""The MainView class displays the Views in Fluents.
MainView, of which there is normally only one instance, contains a
gtk.Table that holds all the visible Views, and a single ViewFrame
that is used for maximizing plots.
"""
def __init__(self):
gtk.Notebook.__init__(self)
self.set_show_tabs(False)
self.set_show_border(False)
self._view_frames = []
self._views = ObjectTable(2, 2, lambda : ViewFrame(self._view_frames))
self._large_view = ViewFrame(list())
self.update_small_views()
for vf in self._view_frames:
vf.connect('focus-changed', self._on_view_focus_changed)
self.append_page(self._small_views)
self.append_page(self._large_view)
self.show()
self.set_current_page(0)
def __getitem__(self, x, y):
return self._views[x, y]
def update_small_views(self):
"""Creates a new gtk.Table to show the views. Called after changes to
the _views property"""
self._small_views = gtk.Table(self._views.ysize, self._views.xsize, True)
self._small_views.set_col_spacings(4)
self._small_views.set_row_spacings(4)
for x in range(self._views.xsize):
for y in range(self._views.ysize):
child = self._views[x,y]
self._small_views.attach(child, x, x+1, y, y+1)
self._small_views.show_all()
def get_active_small_view(self):
"""Returns the active ViewFrame in the small views table.
If a view is maximized, the corresponding ViewFrame in the table
will be returned, not the active maximized ViewFrame"""
for vf in self._view_frames:
if vf.focused:
return vf
return None
def get_active_view_frame(self):
"""Returns the active view frame."""
if self.get_current_page() == 0:
return self.get_active_small_view()
else:
return self._large_view
def goto_large(self):
"""Maximize the view in the current ViewFrame.
Maximizes the View in the current ViewFrame. The ViewFrame itself is
not resized or modified, except it's view will be set to None.
This method will do nothing if a view is currently maximized.
"""
if self.get_current_page() == 1:
return
vf = self.get_active_small_view()
view = vf.get_view()
vf.set_view(None)
self._large_view.set_view(view)
self.set_current_page(1)
def goto_small(self):
"""Goes to the small views page.
The maximized View will be given to the active ViewFrame in the view
table.
"""
if self.get_current_page() == 0:
return
vf = self.get_active_small_view()
view = self._large_view.get_view()
self._large_view.set_view(None)
vf.set_view(view)
self.set_current_page(0)
def insert_view(self, view):
"""Set a view in the currently active ViewFrame.
@param view: An instance of View.
"""
if self.get_current_page() == 0:
vf = self.get_active_small_view()
else:
vf = self._large_view
vf.set_view(view)
def set_all_plots(self, views):
"""Displays all the views in the list, and hides all other views.
Loops through all ViewFrames from top left to bottom right, and sets
their currently active View to the next view in the list. After the
last view is placed in a ViewFrame, the remaining ViewFrames are
emptied.
@param views: A list of views to set.
"""
for y in range(self._views.ysize):
for x in range(self._views.xsize):
if views:
self._views[x, y].set_view(views.pop())
else:
self._views[x, y].set_view(None)
def get_active_view_index(self):
current = self.get_active_small_view()
for i in range(self._views.xsize):
for j in range(self._views.ysize):
if self._views[i, j] == current:
return (i, j)
return None
def set_active_view_by_index(self, x, y):
self._views[x, y].focus()
def move_focus_left(self):
x, y = self.get_active_view_index()
if x > 0:
self.set_active_view_by_index(x-1, y)
def move_focus_right(self):
x, y = self.get_active_view_index()
if x < self._views.xsize-1:
self.set_active_view_by_index(x+1, y)
def move_focus_up(self):
x, y = self.get_active_view_index()
if y > 0:
self.set_active_view_by_index(x, y-1)
def move_focus_down(self):
x, y = self.get_active_view_index()
if y < self._views.ysize-1:
self.set_active_view_by_index(x, y+1)
def _on_view_focus_changed(self, widget, vf, focused):
if focused:
self.emit('view-changed', vf)
def resize_table(self, width, height):
"""Resizes the list of small views.
"""
## Hide all plots that will be removed from the screen.
for x in range(self._views.xsize):
for y in range(self._views.ysize):
if x >= width or y >= height:
self._views[x, y].set_view(None)
self._view_frames.remove(self._views[x, y])
for x in range(self._views.xsize):
for y in range(self._views.ysize):
self._small_views.remove(self._views[x, y])
self._views.resize(width, height)
self.update_small_views()
self.insert_page(self._small_views, gtk.Label("small"), 0)
self.remove_page(1)
#self.set_current_page(0)
self.goto_small()
class View (gtk.Frame):
"""The base class of everything that is shown in the center view of
fluents.
Most views should rather subclass Plot, which automatically handles
freezing, creates a toolbar, and sets up matplotlib Figure and Canvas
objects.
"""
def __init__(self, title):
gtk.Frame.__init__(self)
self.title = title
self.set_shadow_type(gtk.SHADOW_NONE)
self._view_frame = None
def get_toolbar(self):
return None
def is_mappable_with(self, dataset):
"""Override in individual plots."""
return False
class EmptyView (View):
"""EmptyView is shown in ViewFrames that are unused."""
def __init__(self):
View.__init__(self, 'Empty view')
self.set_label(None)
label = gtk.Label('No view')
ebox = gtk.EventBox()
ebox.add(label)
self.add(ebox)
label.show()
ebox.show()
self.show()
class PlotMode:
"""A PlotMode object corresponds to a mouse mode in a plot.
When a mode is selected in the toolbar, the PlotMode corresponding
to the toolbar button is activated by calling setup(ax) for the axis
system ax.
"""
def __init__(self, plot, name, tooltip, image_file):
self.name = name
self.tooltip = tooltip
self.image_file = image_file
self.plot = plot
self.canvas = plot.canvas
def get_icon(self):
"""Returns the icon for the PlotMode"""
image = gtk.Image()
image.set_from_pixbuf(fluents.icon_factory.get(self.image_file))
return image
def activate(self):
"""Subclasses of PlotMode should do their initialization here.
The activate method is called when a mode is activated, and is
used primarily to set up callback functions on events in the
canvas.
"""
pass
def deactivate(self):
"""Subclasses of PlotMode should do their cleanup here.
The deactivate method is primarily by subclasses of PlotMode to
remove any callbacks they might have on the matplotlib canvas.
"""
pass
class DefaultPlotMode(PlotMode):
def __init__(self, plot):
PlotMode.__init__(self, plot, 'default', 'Default mode', 'cursor')
class PanPlotMode(PlotMode):
def __init__(self, plot):
PlotMode.__init__(self, plot, 'pan',
'Pan axes with left mouse, zoom with right',
'move')
# Holds handler IDs for callbacks.
self._button_press = None
self._button_release = None
self._motion_notify = None
self._xypress = None
self._button_pressed = None
def activate(self):
self._button_press = self.canvas.mpl_connect(
'button_press_event', self._on_button_press)
self._button_release = self.canvas.mpl_connect(
'button_release_event', self._on_button_release)
def deactivate(self):
if self._button_press:
self.canvas.mpl_disconnect(self._button_press)
if self._button_release:
self.canvas.mpl_disconnect(self._button_release)
def _on_button_press(self, event):
if event.button == 1:
self._button_pressed = 1
elif event.button == 3:
self._button_pressed = 3
else:
self._button_pressed=None
return
x, y = event.x, event.y
# push the current view to define home if stack is empty
# if self._views.empty(): self.push_current()
self._xypress=[]
for i, a in enumerate(self.canvas.figure.get_axes()):
if x is not None and y is not None and a.in_axes(x, y) \
and a.get_navigate():
xmin, xmax = a.get_xlim()
ymin, ymax = a.get_ylim()
lim = xmin, xmax, ymin, ymax
self._xypress.append((x, y, a, i, lim,a.transData.deepcopy()))
self.canvas.mpl_disconnect(self._motion_notify)
cid = self.canvas.mpl_connect('motion_notify_event',
self._on_motion_notify)
self._motion_notify = cid
def _on_motion_notify(self, event):
"""The drag callback in pan/zoom mode"""
def format_deltas(event, dx, dy):
"""Returns the correct dx and dy based on the modifier keys"""
if event.key=='control':
if(abs(dx)>abs(dy)):
dy = dx
else:
dx = dy
elif event.key=='x':
dy = 0
elif event.key=='y':
dx = 0
elif event.key=='shift':
if 2*abs(dx) < abs(dy):
dx=0
elif 2*abs(dy) < abs(dx):
dy=0
elif(abs(dx)>abs(dy)):
dy=dy/abs(dy)*abs(dx)
else:
dx=dx/abs(dx)*abs(dy)
return (dx,dy)
for cur_xypress in self._xypress:
lastx, lasty, a, ind, lim, trans = cur_xypress
xmin, xmax, ymin, ymax = lim
#safer to use the recorded button at the press than current button:
#multiple button can get pressed during motion...
if self._button_pressed==1:
lastx, lasty = trans.inverse_xy_tup( (lastx, lasty) )
x, y = trans.inverse_xy_tup( (event.x, event.y) )
if a.get_xscale()=='log':
dx=1-lastx/x
else:
dx=x-lastx
if a.get_yscale()=='log':
dy=1-lasty/y
else:
dy=y-lasty
dx,dy=format_deltas(event,dx,dy)
if a.get_xscale()=='log':
xmin *= 1-dx
xmax *= 1-dx
else:
xmin -= dx
xmax -= dx
if a.get_yscale()=='log':
ymin *= 1-dy
ymax *= 1-dy
else:
ymin -= dy
ymax -= dy
elif self._button_pressed==3:
try:
dx=(lastx-event.x)/float(a.bbox.width())
dy=(lasty-event.y)/float(a.bbox.height())
dx,dy=format_deltas(event,dx,dy)
if a.get_aspect() != 'auto':
dx = 0.5*(dx + dy)
dy = dx
alphax = pow(10.0,dx)
alphay = pow(10.0,dy)
lastx, lasty = trans.inverse_xy_tup( (lastx, lasty) )
if a.get_xscale()=='log':
xmin = lastx*(xmin/lastx)**alphax
xmax = lastx*(xmax/lastx)**alphax
else:
xmin = lastx+alphax*(xmin-lastx)
xmax = lastx+alphax*(xmax-lastx)
if a.get_yscale()=='log':
ymin = lasty*(ymin/lasty)**alphay
ymax = lasty*(ymax/lasty)**alphay
else:
ymin = lasty+alphay*(ymin-lasty)
ymax = lasty+alphay*(ymax-lasty)
except OverflowError:
warnings.warn('Overflow while panning')
return
a.set_xlim(xmin, xmax)
a.set_ylim(ymin, ymax)
self.canvas.draw()
def _on_button_release(self, event):
'the release mouse button callback in pan/zoom mode'
self.canvas.mpl_disconnect(self._motion_notify)
if not self._xypress: return
self._xypress = None
self._button_pressed = None
self.canvas.draw()
self.plot.emit('pan-changed', self)
class ZoomPlotMode(PlotMode):
def __init__(self, plot):
PlotMode.__init__(self, plot, 'zoom',
'Zoom to rectangle','zoom_to_rect')
self._selectors = {}
def activate(self):
self.cids = []
for ax in self.canvas.figure.get_axes():
selector = Selector(ax, self._on_select,
select_type='rectangle')
selector.line.set_linestyle('-')
selector.line.set_linewidth(0.5)
self.cids.append(self.canvas.mpl_connect('button_release_event',
selector._onrelease))
self.cids.append(self.canvas.mpl_connect('motion_notify_event',
selector._onmove))
self.cids.append(self.canvas.mpl_connect('button_press_event',
selector._onpress))
def deactivate(self):
for cid in self.cids:
self.canvas.mpl_disconnect(cid)
def _on_select(self, x1, y1, x2, y2, key):
if abs(x1-x2)<0.0001 or abs(y1-y2)<0.0001:
# too sensitive zoom crashes matplotlib
return
ax = self.canvas.figure.get_axes()[0]
ax.set_xlim((min(x1, x2), max(x1, x2)))
ax.set_ylim((min(y1,y2), max(y1, y2)))
self.canvas.draw()
self.plot.emit('zoom-changed', self)
class SelectLassoPlotMode(PlotMode):
def __init__(self, plot):
PlotMode.__init__(self, plot, 'lassoselect',
'Select within lasso', 'lasso')
self._selectors = {}
def activate(self):
self.cids = []
for ax in self.canvas.figure.get_axes():
lasso = Selector(ax, self.plot.lasso_select_callback,
select_type='lasso')
self.cids.append(self.canvas.mpl_connect('button_release_event',
lasso._onrelease))
self.cids.append(self.canvas.mpl_connect('motion_notify_event',
lasso._onmove))
self.cids.append(self.canvas.mpl_connect('button_press_event',
lasso._onpress))
def deactivate(self):
for cid in self.cids:
self.canvas.mpl_disconnect(cid)
class SelectRectanglePlotMode(PlotMode):
def __init__(self, plot):
PlotMode.__init__(self, plot, 'select',
'Select within rectangle', 'select')
self._selectors = {}
def activate(self):
self.cids = []
for ax in self.canvas.figure.get_axes():
lasso = Selector(ax, self.plot.rectangle_select_callback,
select_type='rectangle')
self.cids.append(self.canvas.mpl_connect('button_release_event',
lasso._onrelease))
self.cids.append(self.canvas.mpl_connect('motion_notify_event',
lasso._onmove))
self.cids.append(self.canvas.mpl_connect('button_press_event',
lasso._onpress))
def deactivate(self):
for cid in self.cids:
self.canvas.mpl_disconnect(cid)
class PlotToolbar(gtk.Toolbar):
def __init__(self, plot):
gtk.Toolbar.__init__(self)
self.plot = plot
self.canvas = plot.canvas
self._current_mode = None
self.tooltips = gtk.Tooltips()
self._mode_sensitive = {}
## Maps toolbar buttons to PlotMode objects.
self._mode_buttons = {}
self.set_property('show-arrow', False)
self.canvas.connect('enter-notify-event', self.on_enter_notify)
self.show()
self.add_mode(DefaultPlotMode(self.plot))
self.add_mode(PanPlotMode(self.plot))
self.add_mode(ZoomPlotMode(self.plot))
self.add_mode(SelectRectanglePlotMode(self.plot))
self.add_mode(SelectLassoPlotMode(self.plot))
self.insert(gtk.SeparatorToolItem(), -1)
self.set_style(gtk.TOOLBAR_ICONS)
# Set up freeze button
btn = gtk.ToolButton(gtk.STOCK_SAVE)
#btn.set_icon_widget(image)
btn.connect('clicked', self._on_save_clicked)
self.insert(btn, -1)
self.save_button = btn
# Set up freeze button
btn = gtk.ToggleToolButton()
image = gtk.Image()
image.set_from_pixbuf(fluents.icon_factory.get('freeze'))
btn.set_icon_widget(image)
btn.connect('toggled', self._on_freeze_toggle)
self.insert(btn, -1)
self.freeze_button = btn
self.show_all()
def add_mode(self, mode):
"""Adds a new mode to the toolbar."""
self._mode_sensitive[mode] = True
if len(self._mode_buttons) > 0:
other = self._mode_buttons.keys()[0]
else:
other = None
btn = gtk.RadioToolButton(other)
btn.set_icon_widget(mode.get_icon())
btn.set_tooltip(self.tooltips, mode.tooltip, 'Private')
btn.connect('toggled', self._on_mode_toggle)
self._mode_buttons[btn] = mode
self.insert(btn, -1)
if self._current_mode == None:
self._current_mode = mode
def get_mode(self):
"""Returns the active mode name."""
if self._current_mode:
return self._current_mode.name
return None
def get_mode_by_name(self, mode_name):
"""Returns the mode with the given name or None."""
for m in self._mode_buttons.values():
if m.name == mode_name:
return m
return None
def get_button(self, mode_name):
"""Returns the button that corresponds to a mode name."""
for b, m in self._mode_buttons.items():
if m.name == mode_name:
return b
return None
def set_mode(self, mode_name):
"""Sets a mode by name. Returns the mode or None"""
if mode_name == self._current_mode.name:
return None
if self._current_mode:
self._current_mode.deactivate()
new_mode = self.get_mode_by_name(mode_name)
if new_mode:
new_mode.activate()
self._current_mode = self.get_mode_by_name(mode_name)
else:
logger.log('warning', 'No such mode: %s' % mode_name)
if self.get_button(mode_name) and \
not self.get_button(mode_name).get_active():
self.get_button(mode_name).set_active(True)
globals()['active_mode'] = mode_name
return self._current_mode
def set_mode_sensitive(self, mode, bool):
self._mode_sensitive[mode] = bool
self.get_button(mode).set_sensitive(False)
def _on_mode_toggle(self, button):
mode = self._mode_buttons[button].name
if self._mode_sensitive.get(mode) == False:
logger.log('notice', 'Mode: %s is not sensitive in this plot' %mode)
if button.get_active():
self.set_mode(self._mode_buttons[button].name)
def _on_save_clicked(self, button):
"""Pops up a file dialog saver, and saves current plot"""
dialog = gtk.FileChooserDialog('Save plot')
dialog.set_action(gtk.FILE_CHOOSER_ACTION_SAVE)
dialog.add_buttons(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL, gtk.STOCK_SAVE, gtk.RESPONSE_OK)
default_name = "fluents_image"
dialog.set_current_name("%s.png" % default_name)
retval = dialog.run()
if retval in [gtk.RESPONSE_CANCEL, gtk.RESPONSE_DELETE_EVENT]:
logger.log("debug", "Cancelled save plot")
elif retval == gtk.RESPONSE_OK:
logger.log("debug", "Saving plot as: %s" % dialog.get_filename())
self.canvas.print_figure(dialog.get_filename())
else:
print "unknown; ", retval
dialog.destroy()
def _on_freeze_toggle(self, button):
self.plot.set_frozen(button.get_active())
def on_enter_notify(self, widget, event):
self.set_mode(active_mode)
# need views (plots) to grab key-events
widget.grab_focus()
class Selector:
def __init__(self, ax, callback, select_type='lasso'):
self.drawon = True
self.eventson = True
self.select_type = select_type
self.eventpress = None
self.eventrelease = None
self._background = None
self.callback = callback
self.axes = ax
self.figure = self.axes.figure
self.canvas = self.figure.canvas
self.verts = []
# to draw
patch_props = dict(facecolor='gray', linewidth = 0,
alpha=0.3, fill=True)
line_props = dict(linestyle='--', lw=1.0, color='black')
self.line = Line2D([0,0], [0,0], visible=False, **line_props)
self.axes.add_line(self.line)
if self.select_type == 'lasso':
self.polygon = Polygon([(0, 0)], visible=False, **patch_props)
elif self.select_type == 'rectangle':
self.polygon = Rectangle((0,0), 0, 1, visible=False, **patch_props)
self.axes.add_patch(self.polygon)
def _onrelease(self, event):
if self.eventpress is None or self._ignore(event):
return
self.eventrelease = event
self._show_selector(False)
if self.verts is not None:
self.verts.append((event.xdata, event.ydata))
if self.select_type == 'lasso':
if len(self.verts)>2:
self.callback(self.verts, event.key)
elif self.select_type == 'rectangle':
x1, y1 = self.eventpress.xdata, self.eventpress.ydata
x2, y2 = self.eventrelease.xdata, self.eventrelease.ydata
self.callback(x1, y1, x2, y2, event.key)
self.verts = []
self.eventpress = None
self.eventrelease = None
self._background = None
return False
def _onmove(self, event):
if self.eventpress is None or self._ignore(event):return
# add new data
if self.select_type == 'lasso':
self.verts.append((event.xdata, event.ydata))
self.polygon.xy = self.verts
self.line.set_data(zip(*self.verts))
elif self.select_type == 'rectangle':
x,y = event.xdata, event.ydata
minx, maxx = self.eventpress.xdata, x
miny, maxy = self.eventpress.ydata, y
if minx>maxx: minx, maxx = maxx, minx
if miny>maxy: miny, maxy = maxy, miny
self.polygon.xy[0] = minx
self.polygon.xy[1] = miny
self.polygon.set_width(maxx-minx)
self.polygon.set_height(maxy-miny)
xx = [minx, maxx, maxx, minx, minx]
yy = [miny, miny, maxy, maxy, miny]
self.line.set_data(xx,yy)
# draw
self.canvas.restore_region(self._background)
self.axes.draw_artist(self.line)
self.axes.draw_artist(self.polygon)
self.canvas.blit(self.axes.bbox)
def _onpress(self, event):
# Is the event to be ignored?
if self._ignore(event): return
self._show_selector(True)
self.eventpress = event
self.verts = [(event.xdata, event.ydata)]
return False
def _ignore(self, event):
'return True if event should be ignored'
ignore = False
# If no button was pressed yet ignore the event if it was out
# of the axes
if self.eventpress == None:
return event.inaxes!= self.axes
# If a button was pressed, check if the release-button is the
# same.
ignore = event.inaxes!=self.axes or\
event.button != self.eventpress.button
if ignore:
# remove poly + line if they are visible
if self.polygon._visible or self.line._visible:
self._show_selector(False)
else:
if not self.polygon._visible or not self.line._visible:
# put poly + line back if we event is ok
self._show_selector(True)
return ignore
def _show_selector(self, bool):
if self.polygon and self.line:
self.polygon.set_visible(bool)
self.line.set_visible(bool)
if self._background == None:
self._background = self.canvas.copy_from_bbox(self.axes.bbox)
self.canvas.restore_region(self._background)
self.canvas.blit()
# Create a view-changed signal that should be emitted every time
# the active view changes.
gobject.signal_new('view-changed', MainView, gobject.SIGNAL_RUN_LAST,
gobject.TYPE_NONE,
(gobject.TYPE_PYOBJECT,))
# Create focus-changed signal
gobject.signal_new('focus-changed', ViewFrame, gobject.SIGNAL_RUN_LAST,
gobject.TYPE_NONE,
(gobject.TYPE_PYOBJECT, gobject.TYPE_BOOLEAN,))