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"""
Copyright 2008-2011,2015 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 pygtk
pygtk.require('2.0')
import gtk
import gobject
from Cheetah.Template import Template
from Constants import POSSIBLE_ROTATIONS, CANVAS_GRID_SIZE, DPI_SCALING
def rotate_pixmap(gc, src_pixmap, dst_pixmap, angle=gtk.gdk.PIXBUF_ROTATE_COUNTERCLOCKWISE):
"""
Load the destination pixmap with a rotated version of the source pixmap.
The source pixmap will be loaded into a pixbuf, rotated, and drawn to the destination pixmap.
The pixbuf is a client-side drawable, where a pixmap is a server-side drawable.
Args:
gc: the graphics context
src_pixmap: the source pixmap
dst_pixmap: the destination pixmap
angle: the angle to rotate by
"""
width, height = src_pixmap.get_size()
pixbuf = gtk.gdk.Pixbuf(
colorspace=gtk.gdk.COLORSPACE_RGB,
has_alpha=False, bits_per_sample=8,
width=width, height=height,
)
pixbuf.get_from_drawable(src_pixmap, src_pixmap.get_colormap(), 0, 0, 0, 0, -1, -1)
pixbuf = pixbuf.rotate_simple(angle)
dst_pixmap.draw_pixbuf(gc, pixbuf, 0, 0, 0, 0)
def get_rotated_coordinate(coor, rotation):
"""
Rotate the coordinate by the given rotation.
Args:
coor: the coordinate x, y tuple
rotation: the angle in degrees
Returns:
the rotated coordinates
"""
# handles negative angles
rotation = (rotation + 360)%360
if rotation not in POSSIBLE_ROTATIONS:
raise ValueError('unusable rotation angle "%s"'%str(rotation))
# determine the number of degrees to rotate
cos_r, sin_r = {
0: (1, 0), 90: (0, 1), 180: (-1, 0), 270: (0, -1),
}[rotation]
x, y = coor
return x * cos_r + y * sin_r, -x * sin_r + y * cos_r
def get_angle_from_coordinates((x1, y1), (x2, y2)):
"""
Given two points, calculate the vector direction from point1 to point2, directions are multiples of 90 degrees.
Args:
(x1,y1): the coordinate of point 1
(x2,y2): the coordinate of point 2
Returns:
the direction in degrees
"""
if y1 == y2: # 0 or 180
return 0 if x2 > x1 else 180
else: # 90 or 270
return 270 if y2 > y1 else 90
def encode(value):
"""Make sure that we pass only valid utf-8 strings into markup_escape_text.
Older versions of glib seg fault if the last byte starts a multi-byte
character.
"""
valid_utf8 = value.decode('utf-8', 'replace').encode('utf-8')
return gobject.markup_escape_text(valid_utf8)
class TemplateParser(object):
def __init__(self):
self.cache = {}
def __call__(self, tmpl_str, **kwargs):
"""
Parse the template string with the given args.
Pass in the xml encode method for pango escape chars.
Args:
tmpl_str: the template as a string
Returns:
a string of the parsed template
"""
kwargs['encode'] = encode
template = self.cache.setdefault(tmpl_str, Template.compile(tmpl_str))
return str(template(namespaces=kwargs))
parse_template = TemplateParser()
def align_to_grid(coor, mode=round):
def align(value):
return int(mode(value / (1.0 * CANVAS_GRID_SIZE)) * CANVAS_GRID_SIZE)
try:
return map(align, coor)
except TypeError:
x = coor
return align(coor)
def scale(coor, reverse=False):
factor = DPI_SCALING if not reverse else 1 / DPI_SCALING
return tuple(int(x * factor) for x in coor)
def scale_scalar(coor, reverse=False):
factor = DPI_SCALING if not reverse else 1 / DPI_SCALING
return int(coor * factor)
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