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"""
Copyright 2007, 2008 Free Software Foundation, Inc.
This file is part of GNU Radio
GNU Radio Companion is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
GNU Radio Companion is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
"""
import Utils
from Element import Element
import Colors
from Constants import CONNECTOR_ARROW_BASE, CONNECTOR_ARROW_HEIGHT
class Connection(Element):
"""A graphical connection for ports."""
def get_coordinate(self):
"""
Get the 0,0 coordinate.
Coordinates are irrelevant in connection.
@return 0, 0
"""
return (0, 0)
def get_rotation(self):
"""
Get the 0 degree rotation.
Rotations are irrelevant in connection.
@return 0
"""
return 0
def update(self):
"""Precalculate relative coordinates."""
self._sink_rot = None
self._source_rot = None
self._sink_coor = None
self._source_coor = None
#get the source coordinate
connector_length = self.get_source().get_connector_length()
self.x1, self.y1 = Utils.get_rotated_coordinate((connector_length, 0), self.get_source().get_rotation())
#get the sink coordinate
connector_length = self.get_sink().get_connector_length() + CONNECTOR_ARROW_HEIGHT
self.x2, self.y2 = Utils.get_rotated_coordinate((-connector_length, 0), self.get_sink().get_rotation())
#build the arrow
self.arrow = [(0, 0),
Utils.get_rotated_coordinate((-CONNECTOR_ARROW_HEIGHT, -CONNECTOR_ARROW_BASE/2), self.get_sink().get_rotation()),
Utils.get_rotated_coordinate((-CONNECTOR_ARROW_HEIGHT, CONNECTOR_ARROW_BASE/2), self.get_sink().get_rotation()),
]
self._update_after_move()
if self.is_valid(): self._foreground = Colors.FG_COLOR
else: self._foreground = Colors.ERROR_COLOR
def _update_after_move(self):
"""Calculate coordinates."""
self.clear()
#source connector
source = self.get_source()
X, Y = source.get_connector_coordinate()
x1, y1 = self.x1 + X, self.y1 + Y
self.add_line((x1, y1), (X, Y))
#sink connector
sink = self.get_sink()
X, Y = sink.get_connector_coordinate()
x2, y2 = self.x2 + X, self.y2 + Y
self.add_line((x2, y2), (X, Y))
#adjust arrow
self._arrow = [(x+X, y+Y) for x,y in self.arrow]
#add the horizontal and vertical lines in this connection
if abs(source.get_connector_direction() - sink.get_connector_direction()) == 180:
#2 possible point sets to create a 3-line connector
mid_x, mid_y = (x1 + x2)/2.0, (y1 + y2)/2.0
points = [((mid_x, y1), (mid_x, y2)), ((x1, mid_y), (x2, mid_y))]
#source connector -> points[0][0] should be in the direction of source (if possible)
if Utils.get_angle_from_coordinates((x1, y1), points[0][0]) != source.get_connector_direction(): points.reverse()
#points[0][0] -> sink connector should not be in the direction of sink
if Utils.get_angle_from_coordinates(points[0][0], (x2, y2)) == sink.get_connector_direction(): points.reverse()
#points[0][0] -> source connector should not be in the direction of source
if Utils.get_angle_from_coordinates(points[0][0], (x1, y1)) == source.get_connector_direction(): points.reverse()
#create 3-line connector
p1, p2 = map(int, points[0][0]), map(int, points[0][1])
self.add_line((x1, y1), p1)
self.add_line(p1, p2)
self.add_line((x2, y2), p2)
else:
#2 possible points to create a right-angled connector
points = [(x1, y2), (x2, y1)]
#source connector -> points[0] should be in the direction of source (if possible)
if Utils.get_angle_from_coordinates((x1, y1), points[0]) != source.get_connector_direction(): points.reverse()
#points[0] -> sink connector should not be in the direction of sink
if Utils.get_angle_from_coordinates(points[0], (x2, y2)) == sink.get_connector_direction(): points.reverse()
#points[0] -> source connector should not be in the direction of source
if Utils.get_angle_from_coordinates(points[0], (x1, y1)) == source.get_connector_direction(): points.reverse()
#create right-angled connector
self.add_line((x1, y1), points[0])
self.add_line((x2, y2), points[0])
def draw(self, gc, window):
"""
Draw the connection.
@param gc the graphics context
@param window the gtk window to draw on
"""
sink = self.get_sink()
source = self.get_source()
#check for changes
if self._sink_rot != sink.get_rotation() or self._source_rot != source.get_rotation(): self.update()
elif self._sink_coor != sink.get_coordinate() or self._source_coor != source.get_coordinate(): self._update_after_move()
#cache values
self._sink_rot = sink.get_rotation()
self._source_rot = source.get_rotation()
self._sink_coor = sink.get_coordinate()
self._source_coor = source.get_coordinate()
#draw
fg_color = self.get_enabled() and Colors.FG_COLOR or Colors.DISABLED_FG_COLOR
Element.draw(self, gc, window, FG_color=fg_color)
gc.foreground = self._foreground
#draw arrow on sink port
window.draw_polygon(gc, True, self._arrow)
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