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"""
Copyright 2008-2011,2015 Free Software Foundation, Inc.
This file is part of GNU Radio
SPDX-License-Identifier: GPL-2.0-or-later
"""
from __future__ import absolute_import
import numbers
from gi.repository import GLib
import cairo
import six
from .canvas.colors import FLOWGRAPH_BACKGROUND_COLOR
from . import Constants
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 Constants.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(p1, p2):
"""
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
"""
(x1, y1) = p1
(x2, y2) = p2
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 align_to_grid(coor, mode=round):
def align(value):
return int(mode(value / (1.0 * Constants.CANVAS_GRID_SIZE)) * Constants.CANVAS_GRID_SIZE)
try:
return [align(c) for c in coor]
except TypeError:
x = coor
return align(coor)
def num_to_str(num):
""" Display logic for numbers """
def eng_notation(value, fmt='g'):
"""Convert a number to a string in engineering notation. E.g., 5e-9 -> 5n"""
template = '{:' + fmt + '}{}'
magnitude = abs(value)
for exp, symbol in zip(range(9, -15-1, -3), 'GMk munpf'):
factor = 10 ** exp
if magnitude >= factor:
return template.format(value / factor, symbol.strip())
return template.format(value, '')
if isinstance(num, numbers.Complex):
num = complex(num) # Cast to python complex
if num == 0:
return '0'
output = eng_notation(num.real) if num.real else ''
output += eng_notation(num.imag, '+g' if output else 'g') + 'j' if num.imag else ''
return output
else:
return str(num)
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.
"""
if six.PY2:
valid_utf8 = value.decode('utf-8', errors='replace').encode('utf-8')
else:
valid_utf8 = value
return GLib.markup_escape_text(valid_utf8)
def make_screenshot(flow_graph, file_path, transparent_bg=False):
if not file_path:
return
x_min, y_min, x_max, y_max = flow_graph.get_extents()
padding = Constants.CANVAS_GRID_SIZE
width = x_max - x_min + 2 * padding
height = y_max - y_min + 2 * padding
if file_path.endswith('.png'):
psurf = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
elif file_path.endswith('.pdf'):
psurf = cairo.PDFSurface(file_path, width, height)
elif file_path.endswith('.svg'):
psurf = cairo.SVGSurface(file_path, width, height)
else:
raise ValueError('Unknown file format')
cr = cairo.Context(psurf)
if not transparent_bg:
cr.set_source_rgba(*FLOWGRAPH_BACKGROUND_COLOR)
cr.rectangle(0, 0, width, height)
cr.fill()
cr.translate(padding - x_min, padding - y_min)
flow_graph.create_labels(cr)
flow_graph.create_shapes()
flow_graph.draw(cr)
if file_path.endswith('.png'):
psurf.write_to_png(file_path)
if file_path.endswith('.pdf') or file_path.endswith('.svg'):
cr.show_page()
psurf.finish()
def scale(coor, reverse=False):
factor = Constants.DPI_SCALING if not reverse else 1 / Constants.DPI_SCALING
return tuple(int(x * factor) for x in coor)
def scale_scalar(coor, reverse=False):
factor = Constants.DPI_SCALING if not reverse else 1 / Constants.DPI_SCALING
return int(coor * factor)
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