/usr/lib/python3/dist-packages/cairosvg/surface/helpers.py is in python3-cairosvg 1.0.4-1.
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# This file is part of CairoSVG
# Copyright © 2010-2012 Kozea
#
# This library is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This library 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with CairoSVG. If not, see <http://www.gnu.org/licenses/>.
"""
Surface helpers.
"""
from math import cos, sin, tan, atan2, radians
from . import cairo
from .units import size
# Python 2/3 management
# pylint: disable=C0103
try:
Error = cairo.Error
except AttributeError:
Error = SystemError
# pylint: enable=C0103
class PointError(Exception):
"""Exception raised when parsing a point fails."""
def distance(x1, y1, x2, y2):
"""Get the distance between two points."""
return ((x2 - x1) ** 2 + (y2 - y1) ** 2) ** 0.5
def paint(value):
"""Extract from value an uri and a color.
See http://www.w3.org/TR/SVG/painting.html#SpecifyingPaint
"""
if not value:
return None, None
value = value.strip()
if value.startswith("url"):
source = urls(value.split(")")[0])[0][1:]
color = value.split(")", 1)[-1].strip() or None
else:
source = None
color = value.strip() or None
return (source, color)
def node_format(surface, node):
"""Return ``(width, height, viewbox)`` of ``node``."""
width = size(surface, node.get("width"), "x")
height = size(surface, node.get("height"), "y")
viewbox = node.get("viewBox")
if viewbox:
viewbox = tuple(float(position) for position in viewbox.split())
width = width or viewbox[2]
height = height or viewbox[3]
return width, height, viewbox
def normalize(string=None):
"""Normalize a string corresponding to an array of various values."""
string = string.replace("-", " -")
string = string.replace(",", " ")
while " " in string:
string = string.replace(" ", " ")
string = string.replace("e -", "e-")
string = string.replace("E -", "E-")
values = string.split(" ")
string = ""
for value in values:
if value.count(".") > 1:
numbers = value.split(".")
string += "%s.%s " % (numbers.pop(0), numbers.pop(0))
string += ".%s " % " .".join(numbers)
else:
string += value + " "
return string.strip()
def point(surface, string=None):
"""Return ``(x, y, trailing_text)`` from ``string``."""
if not string:
return (0, 0, "")
try:
x, y, string = (string.strip() + " ").split(" ", 2)
except ValueError:
raise PointError("The point cannot be found in string %s" % string)
return size(surface, x, "x"), size(surface, y, "y"), string
def point_angle(cx, cy, px, py):
"""Return angle between x axis and point knowing given center."""
return atan2(py - cy, px - cx)
def preserve_ratio(surface, node):
"""Manage the ratio preservation."""
if node.tag == "marker":
scale_x = size(surface, node.get("markerWidth", "3"), "x")
scale_y = size(surface, node.get("markerHeight", "3"), "y")
translate_x = -size(surface, node.get("refX"))
translate_y = -size(surface, node.get("refY"))
elif node.tag in ("svg", "image"):
width, height, _ = node_format(surface, node)
scale_x = width / node.image_width
scale_y = height / node.image_height
align = node.get("preserveAspectRatio", "xMidYMid").split(" ")[0]
if align == "none":
return scale_x, scale_y, 0, 0
else:
mos_properties = node.get("preserveAspectRatio", "").split()
meet_or_slice = (
mos_properties[1] if len(mos_properties) > 1 else None)
if meet_or_slice == "slice":
scale_value = max(scale_x, scale_y)
else:
scale_value = min(scale_x, scale_y)
scale_x = scale_y = scale_value
x_position = align[1:4].lower()
y_position = align[5:].lower()
if x_position == "min":
translate_x = 0
if y_position == "min":
translate_y = 0
if x_position == "mid":
translate_x = (width / scale_x - node.image_width) / 2.
if y_position == "mid":
translate_y = (height / scale_y - node.image_height) / 2.
if x_position == "max":
translate_x = width / scale_x - node.image_width
if y_position == "max":
translate_y = height / scale_y - node.image_height
return scale_x, scale_y, translate_x, translate_y
def quadratic_points(x1, y1, x2, y2, x3, y3):
"""Return the quadratic points to create quadratic curves."""
xq1 = x2 * 2 / 3 + x1 / 3
yq1 = y2 * 2 / 3 + y1 / 3
xq2 = x2 * 2 / 3 + x3 / 3
yq2 = y2 * 2 / 3 + y3 / 3
return xq1, yq1, xq2, yq2, x3, y3
def rotate(x, y, angle):
"""Rotate a point of an angle around the origin point."""
return x * cos(angle) - y * sin(angle), y * cos(angle) + x * sin(angle)
def transform(surface, string):
"""Update ``surface`` matrix according to transformation ``string``."""
if not string:
return
transformations = string.split(")")
matrix = cairo.Matrix()
for transformation in transformations:
for ttype in ("scale", "translate", "matrix", "rotate", "skewX",
"skewY"):
if ttype in transformation:
transformation = transformation.replace(ttype, "")
transformation = transformation.replace("(", "")
transformation = normalize(transformation).strip() + " "
values = []
while transformation:
value, transformation = transformation.split(" ", 1)
# TODO: manage the x/y sizes here
values.append(size(surface, value))
if ttype == "matrix":
matrix = cairo.Matrix(*values).multiply(matrix)
elif ttype == "rotate":
angle = radians(float(values.pop(0)))
x, y = values or (0, 0)
matrix.translate(x, y)
matrix.rotate(angle)
matrix.translate(-x, -y)
elif ttype == "skewX":
tangent = tan(radians(float(values[0])))
matrix = \
cairo.Matrix(1, 0, tangent, 1, 0, 0).multiply(matrix)
elif ttype == "skewY":
tangent = tan(radians(float(values[0])))
matrix = \
cairo.Matrix(1, tangent, 0, 1, 0, 0).multiply(matrix)
elif ttype == "translate":
if len(values) == 1:
values += (0,)
matrix.translate(*values)
elif ttype == "scale":
if len(values) == 1:
values = 2 * values
matrix.scale(*values)
apply_matrix_transform(surface, matrix)
def apply_matrix_transform(surface, matrix):
try:
matrix.invert()
except Error:
# Matrix not invertible, clip the surface to an empty path
active_path = surface.context.copy_path()
surface.context.new_path()
surface.context.clip()
surface.context.append_path(active_path)
else:
matrix.invert()
surface.context.transform(matrix)
def urls(string):
"""Parse a comma-separated list of url() strings."""
if not string:
return []
string = string.strip()
if string.startswith("url"):
string = string[3:]
return [
link.strip("() ") for link in string.rsplit(")")[0].split(",")
if link.strip("() ")]
def rect(string):
"""Parse the rect value of a clip."""
if not string:
return []
string = string.strip()
if string.startswith("rect"):
return string[4:].strip('() ').split(',')
else:
return []
def rotations(node):
"""Retrieves the original rotations of a `text` or `tspan` node."""
if "rotate" in node:
original_rotate = [
float(i) for i in normalize(node["rotate"]).strip().split(" ")]
return original_rotate
return []
def pop_rotation(node, original_rotate, rotate):
"""Removes the rotations of a node that are already used."""
node["rotate"] = " ".join(
str(rotate.pop(0) if rotate else original_rotate[-1])
for i in range(len(node.text)))
def zip_letters(xl, yl, dxl, dyl, rl, word):
"""Returns a list with the current letter's positions (x, y and rotation).
E.g.: for letter 'L' with positions x = 10, y = 20 and rotation = 30:
>>> [[10, 20, 30], 'L']
Store the last value of each position and pop the first one in order to
avoid setting an x,y or rotation value that have already been used.
"""
return (
([pl.pop(0) if pl else None for pl in (xl, yl, dxl, dyl, rl)], char)
for char in word)
def flatten(node):
flattened_text = [node.text or ""]
for child in list(node):
flattened_text.append(flatten(child))
flattened_text.append(child.tail or "")
node.remove(child)
return "".join(flattened_text)
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