"""
Copyright 2007, 2008, 2009 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
"""
from __future__ import absolute_import
from .Constants import LINE_SELECT_SENSITIVITY
from six.moves import zip
class Element(object):
"""
GraphicalElement is the base class for all graphical elements.
It contains an X,Y coordinate, a list of rectangular areas that the element occupies,
and methods to detect selection of those areas.
"""
def __init__(self):
"""
Make a new list of rectangular areas and lines, and set the coordinate and the rotation.
"""
self.set_coordinate((0, 0))
self.highlighted = False
self.rotation = 0
self.areas = []
self.lines = []
def clear(self):
"""Empty the lines and areas."""
del self.areas[:]
del self.lines[:]
def is_horizontal(self, rotation=None):
"""
Is this element horizontal?
If rotation is None, use this element's rotation.
Args:
rotation: the optional rotation
Returns:
true if rotation is horizontal
"""
rotation = rotation or self.rotation
return rotation in (0, 180)
def is_vertical(self, rotation=None):
"""
Is this element vertical?
If rotation is None, use this element's rotation.
Args:
rotation: the optional rotation
Returns:
true if rotation is vertical
"""
rotation = rotation or self.rotation
return rotation in (90, 270)
def create_labels(self):
"""
Create labels (if applicable) and call on all children.
Call this base method before creating labels in the element.
"""
for child in self.get_children():
child.create_labels()
def create_shapes(self):
"""
Create shapes (if applicable) and call on all children.
Call this base method before creating shapes in the element.
"""
self.clear()
for child in self.get_children():
child.create_shapes()
def draw(self, widget, cr, border_color, bg_color):
"""
Draw in the given window.
Args:
widget:
cr:
border_color: the color for lines and rectangle borders
bg_color: the color for the inside of the rectangle
"""
X, Y = self.get_coordinate()
cr.translate(X, Y)
for area in self.areas:
# aX = X + rX
# aY = Y + rY
cr.set_source_rgb(*bg_color)
cr.rectangle(*area)
cr.fill()
cr.set_source_rgb(*border_color)
cr.rectangle(*area)
cr.stroke()
cr.set_source_rgb(*border_color)
for line in self.lines:
cr.move_to(*line[0])
for point in line[1:]:
cr.line_to(*point)
cr.stroke()
def rotate(self, rotation):
"""
Rotate all of the areas by 90 degrees.
Args:
rotation: multiple of 90 degrees
"""
self.rotation = (self.rotation + rotation) % 360
def set_coordinate(self, coor):
"""
Set the reference coordinate.
Args:
coor: the coordinate tuple (x,y)
"""
self.coor = coor
def get_coordinate(self):
"""Get the coordinate.
Returns:
the coordinate tuple (x,y)
"""
return self.coor
def move(self, delta_coor):
"""
Move the element by adding the delta_coor to the current coordinate.
Args:
delta_coor: (delta_x,delta_y) tuple
"""
deltaX, deltaY = delta_coor
X, Y = self.get_coordinate()
self.set_coordinate((X + deltaX, Y + deltaY))
def what_is_selected(self, coor, coor_m=None):
"""
One coordinate specified:
Is this element selected at given coordinate?
ie: is the coordinate encompassed by one of the areas or lines?
Both coordinates specified:
Is this element within the rectangular region defined by both coordinates?
ie: do any area corners or line endpoints fall within the region?
Args:
coor: the selection coordinate, tuple x, y
coor_m: an additional selection coordinate.
Returns:
self if one of the areas/lines encompasses coor, else None.
"""
#function to test if p is between a and b (inclusive)
in_between = lambda p, a, b: p >= min(a, b) and p <= max(a, b)
#relative coordinate
x, y = [a-b for a,b in zip(coor, self.get_coordinate())]
if coor_m:
x_m, y_m = [a-b for a,b in zip(coor_m, self.get_coordinate())]
#handle rectangular areas
for x1, y1, w, h in self.areas:
if in_between(x1, x, x_m) and in_between(y1, y, y_m) or \
in_between(x1+w, x, x_m) and in_between(y1, y, y_m) or \
in_between(x1, x, x_m) and in_between(y1+h, y, y_m) or \
in_between(x1+w, x, x_m) and in_between(y1+h, y, y_m):
return self
#handle horizontal or vertical lines
for line in self.lines:
last_point = line[0]
for x2, y2 in line[1:]:
(x1, y1), last_point = last_point, (x2, y2)
if in_between(x1, x, x_m) and in_between(y1, y, y_m) or \
in_between(x2, x, x_m) and in_between(y2, y, y_m):
return self
return None
else:
#handle rectangular areas
for x1, y1, w, h in self.areas:
if in_between(x, x1, x1+w) and in_between(y, y1, y1+h): return self
#handle horizontal or vertical lines
for line in self.lines:
last_point = line[0]
for x2, y2 in line[1:]:
(x1, y1), last_point = last_point, (x2, y2)
if x1 == x2: x1, x2 = x1-LINE_SELECT_SENSITIVITY, x2+LINE_SELECT_SENSITIVITY
if y1 == y2: y1, y2 = y1-LINE_SELECT_SENSITIVITY, y2+LINE_SELECT_SENSITIVITY
if in_between(x, x1, x2) and in_between(y, y1, y2): return self
return None
def mouse_over(self):
pass
def mouse_out(self):
pass