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# -*- coding: utf-8 -*-
#
# Copyright (c) 2020 Martin Owens <doctormo@gmail.com>
# Sergei Izmailov <sergei.a.izmailov@gmail.com>
# Thomas Holder <thomas.holder@schrodinger.com>
#
# 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.
#
# pylint: disable=arguments-differ
"""
Interface for all shapes/polygons such as lines, paths, rectangles, circles etc.
"""
from ..paths import Path
from ..transforms import Transform, ImmutableVector2d, Vector2d
from ..utils import addNS
from ..units import convert_unit
from ._base import ShapeElement
class PathElementBase(ShapeElement):
"""Base element for path based shapes"""
get_path = lambda self: self.get('d')
@classmethod
def new(cls, path, **attrs):
return super(PathElementBase, cls).new(d=Path(path), **attrs)
def set_path(self, path):
"""Set the given data as a path as the 'd' attribute"""
self.set('d', str(Path(path)))
def apply_transform(self):
"""Apply the internal transformation to this node and delete"""
if 'transform' in self.attrib:
self.path = self.path.transform(self.transform)
self.set('transform', Transform())
@property
def original_path(self):
"""Returns the original path if this is a LPE, or the path if not"""
return Path(self.get('inkscape:original-d', self.path))
@original_path.setter
def original_path(self, path):
if addNS('inkscape:original-d') in self.attrib:
self.set('inkscape:original-d', str(Path(path)))
else:
self.path = path
class PathElement(PathElementBase):
"""Provide a useful extension for path elements"""
tag_name = 'path'
@classmethod
def arc(cls, center, rx, ry=None, **kw): # pylint: disable=invalid-name
"""Generate a sodipodi arc (special type)"""
others = [(name, kw.pop(name, None)) for name in ('start', 'end', 'open')]
elem = cls(**kw)
elem.set('sodipodi:cx', center[0])
elem.set('sodipodi:cy', center[1])
elem.set('sodipodi:rx', rx)
elem.set('sodipodi:ry', ry or rx)
elem.set('sodipodi:type', 'arc')
for name, value in others:
if value is not None:
elem.set('sodipodi:'+name, str(value).lower())
return elem
@classmethod
def star(cls, center, radi, sides, rounded=None):
"""Generate a sodipodi start (special type)"""
elem = cls()
elem.set('sodipodi:cx', center[0])
elem.set('sodipodi:cy', center[1])
elem.set('sodipodi:r1', radi[0])
elem.set('sodipodi:r2', radi[1])
elem.set('sodipodi:arg1', 0.85)
elem.set('sodipodi:arg2', 1.3)
elem.set('sodipodi:sides', sides)
elem.set('inkscape:rounded', rounded)
elem.set('sodipodi:type', 'star')
return elem
class Polyline(ShapeElement):
"""Like a path, but made up of straight line segments only"""
tag_name = 'polyline'
def get_path(self):
return Path('M' + self.get('points'))
def set_path(self, path):
points = ['{:g},{:g}'.format(x, y) for x, y in Path(path).end_points]
self.set('points', ' '.join(points))
class Polygon(ShapeElement):
"""A closed polyline"""
tag_name = 'polygon'
get_path = lambda self: 'M' + self.get('points') + ' Z'
class Line(ShapeElement):
"""A line segment connecting two points"""
tag_name = 'line'
get_path = lambda self: 'M{0[x1]},{0[y1]} L{0[x2]},{0[y2]} Z'.format(self.attrib)
@classmethod
def new(cls, start, end, **attrs):
start = Vector2d(start)
end = Vector2d(end)
return super(Line, cls).new(x1=start.x, y1=start.y,
x2=end.x, y2=end.y, **attrs)
class RectangleBase(ShapeElement):
"""Provide a useful extension for rectangle elements"""
left = property(lambda self: convert_unit(self.get('x', '0'), 'px'))
top = property(lambda self: convert_unit(self.get('y', '0'), 'px'))
right = property(lambda self: self.left + self.width)
bottom = property(lambda self: self.top + self.height)
width = property(lambda self: convert_unit(self.get('width', '0'), 'px'))
height = property(lambda self: convert_unit(self.get('height', '0'), 'px'))
rx = property(lambda self: convert_unit(self.get('rx', self.get('ry', 0.0)), 'px'))
ry = property(lambda self: convert_unit(self.get('ry', self.get('rx', 0.0)), 'px')) # pylint: disable=invalid-name
def get_path(self):
"""Calculate the path as the box around the rect"""
if self.rx:
rx, ry = self.rx, self.ry # pylint: disable=invalid-name
return 'M {1},{0.top}'\
'L {2},{0.top} A {0.rx},{0.ry} 0 0 1 {0.right},{3}'\
'L {0.right},{4} A {0.rx},{0.ry} 0 0 1 {2},{0.bottom}'\
'L {1},{0.bottom} A {0.rx},{0.ry} 0 0 1 {0.left},{4}'\
'L {0.left},{3} A {0.rx},{0.ry} 0 0 1 {1},{0.top} z'\
.format(self, self.left + rx, self.right - rx, self.top + ry, self.bottom - ry)
return 'M {0.left},{0.top} h{0.width}v{0.height}h{1} z'.format(self, -self.width)
class Rectangle(RectangleBase):
"""Provide a useful extension for rectangle elements"""
tag_name = 'rect'
@classmethod
def new(cls, left, top, width, height, **attrs):
return super(Rectangle, cls).new(x=left, y=top, width=width, height=height, **attrs)
class EllipseBase(ShapeElement):
"""Absorbs common part of Circle and Ellipse classes"""
def get_path(self):
"""Calculate the arc path of this circle"""
rx, ry = self._rxry()
cx, y = self.center.x, self.center.y - ry
return ('M {cx},{y} '
'a {rx},{ry} 0 1 0 {rx}, {ry} '
'a {rx},{ry} 0 0 0 -{rx}, -{ry} z'
).format(cx=cx, y=y, rx=rx, ry=ry)
@property
def center(self):
return ImmutableVector2d(convert_unit(self.get('cx', '0'), 'px'), convert_unit(self.get('cy', '0'), 'px'))
@center.setter
def center(self, value):
value = Vector2d(value)
self.set("cx", value.x)
self.set("cy", value.y)
def _rxry(self):
# type: () -> Vector2d
"""Helper function """
raise NotImplementedError()
@classmethod
def new(cls, center, radius, **attrs):
circle = super(EllipseBase, cls).new(**attrs)
circle.center = center
circle.radius = radius
return circle
class Circle(EllipseBase):
"""Provide a useful extension for circle elements"""
tag_name = 'circle'
@property
def radius(self):
return convert_unit(self.get('r', '0'), 'px')
@radius.setter
def radius(self, value):
self.set("r", value)
def _rxry(self):
r = self.radius
return Vector2d(r, r)
class Ellipse(EllipseBase):
"""Provide a similar extension to the Circle interface"""
tag_name = 'ellipse'
@property
def radius(self):
return ImmutableVector2d(convert_unit(self.get('rx', '0'), 'px'), convert_unit(self.get('ry', '0'), 'px'))
@radius.setter
def radius(self, value):
value = Vector2d(value)
self.set("rx", str(value.x))
self.set("ry", str(value.y))
def _rxry(self):
return self.radius
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