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Diffstat (limited to '')
-rw-r--r-- | share/extensions/inkex/elements/_meta.py | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/share/extensions/inkex/elements/_meta.py b/share/extensions/inkex/elements/_meta.py new file mode 100644 index 0000000..e9eeb0f --- /dev/null +++ b/share/extensions/inkex/elements/_meta.py @@ -0,0 +1,293 @@ +# -*- coding: utf-8 -*- +# +# Copyright (c) 2020 Martin Owens <doctormo@gmail.com> +# Maren Hachmann <moini> +# +# 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 +""" +Provide extra utility to each svg element type specific to its type. + +This is useful for having a common interface for each element which can +give path, transform, and property access easily. +""" + +from __future__ import annotations +import math + +from typing import Optional + +from lxml import etree + +from ..styles import StyleSheet +from ..transforms import Vector2d, VectorLike, DirectedLineSegment + +from ._base import BaseElement + + +class Defs(BaseElement): + """A header defs element, one per document""" + + tag_name = "defs" + + +class StyleElement(BaseElement): + """A CSS style element containing multiple style definitions""" + + tag_name = "style" + + def set_text(self, content): + """Sets the style content text as a CDATA section""" + self.text = etree.CDATA(str(content)) + + def stylesheet(self): + """Return the StyleSheet() object for the style tag""" + return StyleSheet(self.text, callback=self.set_text) + + +class Script(BaseElement): + """A javascript tag in SVG""" + + tag_name = "script" + + def set_text(self, content): + """Sets the style content text as a CDATA section""" + self.text = etree.CDATA(str(content)) + + +class Desc(BaseElement): + """Description element""" + + tag_name = "desc" + + +class Title(BaseElement): + """Title element""" + + tag_name = "title" + + +class NamedView(BaseElement): + """The NamedView element is Inkscape specific metadata about the file""" + + tag_name = "sodipodi:namedview" + + current_layer = property(lambda self: self.get("inkscape:current-layer")) + + @property + def center(self): + """Returns view_center in terms of document units""" + return Vector2d( + self.root.viewport_to_unit(self.get("inkscape:cx") or 0), + self.root.viewport_to_unit(self.get("inkscape:cy") or 0), + ) + + def get_guides(self): + """Returns a list of guides""" + return self.findall("sodipodi:guide") + + def new_guide(self, position, orient=True, name=None): + """Creates a new guide in this namedview + + Args: + position: a float containing the y position for ``orient is True``, or + the x position for ``orient is False`` + + .. versionchanged:: 1.2 + Alternatively, the position may be given as Tuple (or VectorLike) + orient: True for horizontal, False for Vertical + + .. versionchanged:: 1.2 + Tuple / Vector specifying x and y coordinates of the normal vector + of the guide. + name: label of the guide + + Returns: + the created guide""" + if orient is True: + elem = Guide().move_to(0, position, (0, 1)) + elif orient is False: + elem = Guide().move_to(position, 0, (1, 0)) + else: + elem = Guide().move_to(*position, orient) + if name: + elem.set("inkscape:label", str(name)) + return self.add(elem) + + def new_unique_guide( + self, position: VectorLike, orientation: VectorLike + ) -> Optional[Guide]: + """Add a guide iif there is no guide that looks the same. + + .. versionadded:: 1.2""" + elem = Guide().move_to(position[0], position[1], orientation) + return self.add(elem) if self.get_similar_guide(elem) is None else None + + def get_similar_guide(self, other: Guide) -> Optional[Guide]: + """Check if the namedview contains a guide that looks identical to one + defined by (position, orientation). If such a guide exists, return it; + otherwise, return None. + + .. versionadded:: 1.2""" + for guide in self.get_guides(): + if Guide.guides_coincident(guide, other): + return guide + return None + + def get_pages(self): + """Returns a list of pages + + .. versionadded:: 1.2""" + return self.findall("inkscape:page") + + def new_page(self, x, y, width, height, label=None): + """Creates a new page in this namedview + + .. versionadded:: 1.2""" + elem = Page(width=width, height=height, x=x, y=y) + if label: + elem.set("inkscape:label", str(label)) + return self.add(elem) + + +class Guide(BaseElement): + """An inkscape guide""" + + tag_name = "sodipodi:guide" + + @property + def orientation(self) -> Vector2d: + """Vector normal to the guide + + .. versionadded:: 1.2""" + return Vector2d(self.get("orientation"), fallback=(1, 0)) + + is_horizontal = property( + lambda self: self.orientation[0] == 0 and self.orientation[1] != 0 + ) + is_vertical = property( + lambda self: self.orientation[0] != 0 and self.orientation[1] == 0 + ) + + @property + def point(self) -> Vector2d: + """Position of the guide handle. The y coordinate is flipped and relative + to the bottom of the viewbox, this is a remnant of the pre-1.0 coordinate system + """ + return Vector2d(self.get("position"), fallback=(0, 0)) + + @classmethod + def new(cls, pos_x, pos_y, angle, **attrs): + guide = super().new(**attrs) + guide.move_to(pos_x, pos_y, angle=angle) + return guide + + def move_to(self, pos_x, pos_y, angle=None): + """ + Move this guide to the given x,y position, + + Angle may be a float or integer, which will change the orientation. Alternately, + it may be a pair of numbers (tuple) which will set the orientation directly. + If not given at all, the orientation remains unchanged. + """ + self.set("position", f"{float(pos_x):g},{float(pos_y):g}") + if isinstance(angle, str): + if "," not in angle: + angle = float(angle) + + if isinstance(angle, (float, int)): + # Generate orientation from angle + angle = (math.sin(math.radians(angle)), -math.cos(math.radians(angle))) + + if isinstance(angle, (tuple, list)) and len(angle) == 2: + angle = ",".join(f"{i:g}" for i in angle) + + if angle is not None: + self.set("orientation", angle) + return self + + @staticmethod + def guides_coincident(guide1, guide2): + """Check if two guides defined by (position, orientation) and (opos, oor) look + identical (i.e. the position lies on the other guide AND the guide is + (anti)parallel to the other guide). + + .. versionadded:: 1.2""" + # normalize orientations first + orientation = guide1.orientation / guide1.orientation.length + oor = guide2.orientation / guide2.orientation.length + + position = guide1.point + opos = guide2.point + + return ( + DirectedLineSegment( + position, position + Vector2d(orientation[1], -orientation[0]) + ).perp_distance(*opos) + < 1e-6 + and abs(abs(orientation[1] * oor[0]) - abs(orientation[0] * oor[1])) < 1e-6 + ) + + +class Metadata(BaseElement): + """Inkscape Metadata element""" + + tag_name = "metadata" + + +class ForeignObject(BaseElement): + """SVG foreignObject element""" + + tag_name = "foreignObject" + + +class Switch(BaseElement): + """A switch element""" + + tag_name = "switch" + + +class Grid(BaseElement): + """A namedview grid child""" + + tag_name = "inkscape:grid" + + +class Page(BaseElement): + """A namedview page child + + .. versionadded:: 1.2""" + + tag_name = "inkscape:page" + + width = property(lambda self: self.to_dimensionless(self.get("width") or 0)) + height = property(lambda self: self.to_dimensionless(self.get("height") or 0)) + x = property(lambda self: self.to_dimensionless(self.get("x") or 0)) + y = property(lambda self: self.to_dimensionless(self.get("y") or 0)) + + @classmethod + def new(cls, width, height, x, y): + """Creates a new page element in the namedview""" + page = super().new() + page.move_to(x, y) + page.set("width", width) + page.set("height", height) + return page + + def move_to(self, x, y): + """Move this page to the given x,y position""" + self.set("position", f"{float(x):g},{float(y):g}") + return self |