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# coding=utf-8
#
# Copyright (C) 2005 Aaron Spike, aaron@ekips.org
#
# This program 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.
#
# This program 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.
#
"""A Python path turtle for Inkscape extensions"""
import math
import random
from typing import List, Union
from .paths import Line, Move, Path, PathCommand
from .elements import PathElement, Group, BaseElement
from .styles import Style
class PathTurtle:
"""A Python path turtle
.. versionchanged:: 1.2
pTurtle has been renamed to PathTurtle."""
def __init__(self, home=(0, 0)):
self.__home = [home[0], home[1]]
self.__pos = self.__home[:]
self.__heading = -90
self.__path = ""
self.__draw = True
self.__new = True
def forward(self, mag: float):
"""Move turtle forward by mag in the current direction."""
self.setpos(
(
self.__pos[0] + math.cos(math.radians(self.__heading)) * mag,
self.__pos[1] + math.sin(math.radians(self.__heading)) * mag,
)
)
def backward(self, mag):
"""Move turtle backward by mag in the current direction."""
self.setpos(
(
self.__pos[0] - math.cos(math.radians(self.__heading)) * mag,
self.__pos[1] - math.sin(math.radians(self.__heading)) * mag,
)
)
def right(self, deg):
"""Rotate turtle right by deg degrees.
Changed in inkex 1.2: The turtle now rotates right (previously left) when
calling this method."""
self.__heading += deg
def left(self, deg):
"""Rotate turtle left by deg degrees.
Changed in inkex 1.2: The turtle now rotates left (previously right) when
calling this method."""
self.__heading -= deg
def penup(self):
"""Enable non-drawing / moving mode"""
self.__draw = False
self.__new = False
def pendown(self):
"""Enable drawing mode"""
if not self.__draw:
self.__new = True
self.__draw = True
def pentoggle(self):
"""Switch between drawing and moving mode"""
if self.__draw:
self.penup()
else:
self.pendown()
def home(self):
"""Move to home position"""
self.setpos(self.__home)
def clean(self):
"""Delete current path"""
self.__path = ""
def clear(self):
"""Delete current path and move to home"""
self.clean()
self.home()
def setpos(self, arg):
"""Move/draw to position, depending on the current state"""
if self.__new:
self.__path += "M" + ",".join([str(i) for i in self.__pos])
self.__new = False
self.__pos = arg
if self.__draw:
self.__path += "L" + ",".join([str(i) for i in self.__pos])
def getpos(self):
"""Returns the current position"""
return self.__pos[:]
def setheading(self, deg):
"""Set the heading to deg degrees"""
self.__heading = deg
def getheading(self):
"""Returns the heading in degrees"""
return self.__heading
def sethome(self, arg):
"""Set home position"""
self.__home = list(arg)
def getPath(self):
"""Returns the current path"""
return self.__path
def rtree(self, size, minimum, pt=False):
"""Generates a random tree"""
if size < minimum:
return
self.fd(size)
turn = random.uniform(20, 40)
self.rt(turn)
self.rtree(size * random.uniform(0.5, 0.9), minimum, pt)
self.lt(turn)
turn = random.uniform(20, 40)
self.lt(turn)
self.rtree(size * random.uniform(0.5, 0.9), minimum, pt)
self.rt(turn)
if pt:
self.pu()
self.bk(size)
if pt:
self.pd()
# pylint: disable=invalid-name
fd = forward
bk = backward
rt = right
lt = left
pu = penup
pd = pendown
pTurtle = PathTurtle # should be deprecated
class PathBuilder:
"""This helper class can be used to construct a path and insert it into a
document.
.. versionadded:: 1.2"""
def __init__(self, style: Style):
"""Initializes a PathDrawHelper object
Args:
style (Style): Style of the path.
"""
self.current = Path()
self.style = style
def add(self, command: Union[PathCommand, List[PathCommand]]):
"""Add a Path command to the Helper
Args:
command (Union[PathCommand, List[PathCommand]]): A (list of) PathCommand(s)
to be appended.
"""
self.current.append(command)
def terminate(self):
"""Terminates current subpath. This method does nothing by default and is
supposed to be overridden in subclasses."""
def append_next(self, sibling_before: BaseElement):
"""Insert the resulting Path as :class:`inkex.elements._polygons.PathElement`
into the document tree.
Args:
sibling_before (BaseElement): The element the resulting path will be
appended after.
"""
pth = PathElement()
pth.path = self.current
pth.style = self.style
sibling_before.addnext(pth)
def Move_to(self, x, y): # pylint: disable=invalid-name
"""Shorthand to insert an absolute move command: `M x y`.
Args:
x (Float): x coordinate to move to
y (Float): y coordinate to move to
"""
self.add(Move(x, y))
def Line_to(self, x, y): # pylint: disable=invalid-name
"""Shorthand to insert an absolute lineto command: `L x y`.
Args:
x (Float): x coordinate to draw a line to
y (Float): y coordinate to draw a line to
"""
self.add(Line(x, y))
class PathGroupBuilder(PathBuilder):
"""This helper class can be used to construct a group of paths that all have the
same style.
.. versionadded:: 1.2"""
def __init__(self, style):
super().__init__(style)
self.result = Group()
def terminate(self):
"""Terminates the current Path, and appends it to the group if it is not
empty."""
if len(self.current) > 1:
pth = PathElement()
pth.path = self.current.to_absolute()
pth.style = self.style
self.result.append(pth)
self.current = Path()
def append_next(self, sibling_before: BaseElement):
"""Insert the resulting Path as :class:`inkex.elements._groups.Group` into the
document tree.
Args:
sibling_before (BaseElement): The element the resulting group will be
appended after.
"""
sibling_before.addnext(self.result)
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