/usr/lib/python2.7/dist-packages/cairosvg/surface/path.py is in python-cairosvg 1.0.9-1.
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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/>.
"""
Paths manager.
"""
from math import pi, radians
from .defs import draw_marker
from .helpers import normalize, point, point_angle, quadratic_points, rotate
from .units import size
PATH_LETTERS = "achlmqstvzACHLMQSTVZ"
PATH_TAGS = (
"circle", "ellipse", "line", "path", "polygon", "polyline", "rect")
def path(surface, node):
"""Draw a path ``node``."""
string = node.get("d", "")
if not string.strip():
# Don't draw empty paths at all
return
draw_marker(surface, node, "start")
for letter in PATH_LETTERS:
string = string.replace(letter, " %s " % letter)
last_letter = None
string = normalize(string)
while string:
string = string.strip()
if string.split(" ", 1)[0] in PATH_LETTERS:
letter, string = (string + " ").split(" ", 1)
elif letter == "M":
letter = "L"
elif letter == "m":
letter = "l"
if letter in "aA":
# Elliptic curve
x1, y1 = surface.context.get_current_point()
rx, ry, string = point(surface, string)
rotation, string = string.split(" ", 1)
rotation = radians(float(rotation))
# The large and sweep values are not always separated from the
# following values, here is the crazy parser
large, string = string[0], string[1:].strip()
while not large[-1].isdigit():
large, string = large + string[0], string[1:].strip()
sweep, string = string[0], string[1:].strip()
while not sweep[-1].isdigit():
sweep, string = sweep + string[0], string[1:].strip()
large, sweep = bool(int(large)), bool(int(sweep))
x3, y3, string = point(surface, string)
if letter == "A":
# Absolute x3 and y3, convert to relative
x3 -= x1
y3 -= y1
# rx=0 or ry=0 means straight line
if not rx or not ry:
string = "l %f %f %s" % (x3, y3, string)
continue
radii_ratio = ry / rx
# Cancel the rotation of the second point
xe, ye = rotate(x3, y3, -rotation)
ye /= radii_ratio
# Find the angle between the second point and the x axis
angle = point_angle(0, 0, xe, ye)
# Put the second point onto the x axis
xe = (xe ** 2 + ye ** 2) ** .5
ye = 0
# Update the x radius if it is too small
rx = max(rx, xe / 2)
# Find one circle centre
xc = xe / 2
yc = (rx ** 2 - xc ** 2) ** .5
# Choose between the two circles according to flags
if not (large ^ sweep):
yc = -yc
# Define the arc sweep
arc = \
surface.context.arc if sweep else surface.context.arc_negative
# Put the second point and the center back to their positions
xe, ye = rotate(xe, 0, angle)
xc, yc = rotate(xc, yc, angle)
# Find the drawing angles
angle1 = point_angle(xc, yc, 0, 0)
angle2 = point_angle(xc, yc, xe, ye)
# Store the tangent angles
node.tangents.extend((-angle1, -angle2))
# Draw the arc
surface.context.save()
surface.context.translate(x1, y1)
surface.context.rotate(rotation)
surface.context.scale(1, radii_ratio)
arc(xc, yc, rx, angle1, angle2)
surface.context.restore()
elif letter == "c":
# Relative curve
x, y = surface.context.get_current_point()
x1, y1, string = point(surface, string)
x2, y2, string = point(surface, string)
x3, y3, string = point(surface, string)
node.tangents.extend((
point_angle(x2, y2, x1, y1), point_angle(x2, y2, x3, y3)))
surface.context.rel_curve_to(x1, y1, x2, y2, x3, y3)
# Save absolute values for x and y, useful if next letter is s or S
x1 += x
x2 += x
x3 += x
y1 += y
y2 += y
y3 += y
elif letter == "C":
# Curve
x1, y1, string = point(surface, string)
x2, y2, string = point(surface, string)
x3, y3, string = point(surface, string)
node.tangents.extend((
point_angle(x2, y2, x1, y1), point_angle(x2, y2, x3, y3)))
surface.context.curve_to(x1, y1, x2, y2, x3, y3)
elif letter == "h":
# Relative horizontal line
x, string = (string + " ").split(" ", 1)
old_x, old_y = surface.context.get_current_point()
angle = 0 if size(surface, x, "x") > 0 else pi
node.tangents.extend((-angle, angle))
surface.context.rel_line_to(size(surface, x, "x"), 0)
elif letter == "H":
# Horizontal line
x, string = (string + " ").split(" ", 1)
old_x, old_y = surface.context.get_current_point()
angle = 0 if size(surface, x, "x") > old_x else pi
node.tangents.extend((-angle, angle))
surface.context.line_to(size(surface, x, "x"), old_y)
elif letter == "l":
# Relative straight line
x, y, string = point(surface, string)
angle = point_angle(0, 0, x, y)
node.tangents.extend((-angle, angle))
surface.context.rel_line_to(x, y)
elif letter == "L":
# Straight line
x, y, string = point(surface, string)
old_x, old_y = surface.context.get_current_point()
angle = point_angle(old_x, old_y, x, y)
node.tangents.extend((-angle, angle))
surface.context.line_to(x, y)
elif letter == "m":
# Current point relative move
x, y, string = point(surface, string)
if surface.context.has_current_point():
surface.context.rel_move_to(x, y)
else:
surface.context.move_to(x, y)
elif letter == "M":
# Current point move
x, y, string = point(surface, string)
surface.context.move_to(x, y)
elif letter == "q":
# Relative quadratic curve
x1, y1 = 0, 0
x2, y2, string = point(surface, string)
x3, y3, string = point(surface, string)
xq1, yq1, xq2, yq2, xq3, yq3 = quadratic_points(
x1, y1, x2, y2, x3, y3)
surface.context.rel_curve_to(xq1, yq1, xq2, yq2, xq3, yq3)
node.tangents.extend((0, 0))
elif letter == "Q":
# Quadratic curve
x1, y1 = surface.context.get_current_point()
x2, y2, string = point(surface, string)
x3, y3, string = point(surface, string)
xq1, yq1, xq2, yq2, xq3, yq3 = quadratic_points(
x1, y1, x2, y2, x3, y3)
surface.context.curve_to(xq1, yq1, xq2, yq2, xq3, yq3)
node.tangents.extend((0, 0))
elif letter == "s":
# Relative smooth curve
x, y = surface.context.get_current_point()
x1 = x3 - x2 if last_letter in "csCS" else 0
y1 = y3 - y2 if last_letter in "csCS" else 0
x2, y2, string = point(surface, string)
x3, y3, string = point(surface, string)
node.tangents.extend((
point_angle(x2, y2, x1, y1), point_angle(x2, y2, x3, y3)))
surface.context.rel_curve_to(x1, y1, x2, y2, x3, y3)
# Save absolute values for x and y, useful if next letter is s or S
x1 += x
x2 += x
x3 += x
y1 += y
y2 += y
y3 += y
elif letter == "S":
# Smooth curve
x, y = surface.context.get_current_point()
x1 = x3 + (x3 - x2) if last_letter in "csCS" else x
y1 = y3 + (y3 - y2) if last_letter in "csCS" else y
x2, y2, string = point(surface, string)
x3, y3, string = point(surface, string)
node.tangents.extend((
point_angle(x2, y2, x1, y1), point_angle(x2, y2, x3, y3)))
surface.context.curve_to(x1, y1, x2, y2, x3, y3)
elif letter == "t":
# Relative quadratic curve end
if last_letter not in "QqTt":
x2, y2, x3, y3 = 0, 0, 0, 0
elif last_letter in "QT":
x2 -= x1
y2 -= y1
x3 -= x1
y3 -= y1
x2 = x3 - x2
y2 = y3 - y2
x1, y1 = 0, 0
x3, y3, string = point(surface, string)
xq1, yq1, xq2, yq2, xq3, yq3 = quadratic_points(
x1, y1, x2, y2, x3, y3)
node.tangents.extend((0, 0))
surface.context.rel_curve_to(xq1, yq1, xq2, yq2, xq3, yq3)
elif letter == "T":
# Quadratic curve end
abs_x, abs_y = surface.context.get_current_point()
if last_letter not in "QqTt":
x2, y2, x3, y3 = abs_x, abs_y, abs_x, abs_y
elif last_letter in "qt":
x2 += x1
y2 += y1
x2 = 2 * abs_x - x2
y2 = 2 * abs_y - y2
x1, y1 = abs_x, abs_y
x3, y3, string = point(surface, string)
xq1, yq1, xq2, yq2, xq3, yq3 = quadratic_points(
x1, y1, x2, y2, x3, y3)
node.tangents.extend((0, 0))
surface.context.curve_to(xq1, yq1, xq2, yq2, xq3, yq3)
elif letter == "v":
# Relative vertical line
y, string = (string + " ").split(" ", 1)
old_x, old_y = surface.context.get_current_point()
angle = pi / 2 if size(surface, y, "y") > 0 else -pi / 2
node.tangents.extend((-angle, angle))
surface.context.rel_line_to(0, size(surface, y, "y"))
elif letter == "V":
# Vertical line
y, string = (string + " ").split(" ", 1)
old_x, old_y = surface.context.get_current_point()
angle = pi / 2 if size(surface, y, "y") > 0 else -pi / 2
node.tangents.extend((-angle, angle))
surface.context.line_to(old_x, size(surface, y, "y"))
elif letter in "zZ":
# End of path
node.tangents.extend((0, 0))
surface.context.close_path()
string = string.strip()
if string and letter not in "mMzZ":
draw_marker(surface, node, "mid")
last_letter = letter
if node.tangents != [None]:
# node.tangents == [None] means empty path
node.tangents.append(node.tangents[-1])
draw_marker(surface, node, "end")
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