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python37
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python3.7
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svgwrite
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container.py
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#coding:utf-8 # Author: mozman # Purpose: svg container classes # Created: 15.09.2010 # Copyright (C) 2010, Manfred Moitzi # License: MIT License """ The **container** module provides following structural objects: * :class:`svgwrite.Group` * :class:`svgwrite.SVG` * :class:`svgwrite.Defs` * :class:`svgwrite.Symbol` * :class:`svgwrite.Marker` * :class:`svgwrite.Use` * :class:`svgwrite.Hyperlink` * :class:`svgwrite.Script` * :class:`svgwrite.Style` set/get SVG attributes:: element['attribute'] = value value = element['attribute'] """ from svgwrite.utils import urlopen, font_mimetype, base64_data, find_first_url from svgwrite.base import BaseElement from svgwrite.mixins import ViewBox, Transform, XLink from svgwrite.mixins import Presentation, Clipping from svgwrite.etree import CDATA class Group(BaseElement, Transform, Presentation): """ The **Group** (SVG **g**) element is a container element for grouping together related graphics elements. Grouping constructs, when used in conjunction with the **desc** and **title** elements, provide information about document structure and semantics. Documents that are rich in structure may be rendered graphically, as speech, or as braille, and thus promote accessibility. A group of elements, as well as individual objects, can be given a name using the **id** attribute. Named groups are needed for several purposes such as animation and re-usable objects. """ elementname = 'g' class Defs(Group): """ The **defs** element is a container element for referenced elements. For understandability and accessibility reasons, it is recommended that, whenever possible, referenced elements be defined inside of a **defs**. """ elementname = 'defs' class Symbol(BaseElement, ViewBox, Presentation, Clipping): """ The **symbol** element is used to define graphical template objects which can be instantiated by a **use** element. The use of **symbol** elements for graphics that are used multiple times in the same document adds structure and semantics. Documents that are rich in structure may be rendered graphically, as speech, or as braille, and thus promote accessibility. """ # ITransform interface is not valid for Symbol -> do not inherit from Group elementname = 'symbol' class Marker(BaseElement, ViewBox, Presentation): """ The **marker** element defines the graphics that is to be used for drawing arrowheads or polymarkers on a given **path**, **line**, **polyline** or **polygon** element. Add Marker definitions to a **defs** section, preferred to the **defs** section of the **main drawing**. """ elementname = 'marker' def __init__(self, insert=None, size=None, orient=None, **extra): """ :param 2-tuple insert: reference point (**refX**, **refY**) :param 2-tuple size: (**markerWidth**, **markerHeight**) :param orient: ``'auto'`` | `angle` :param extra: additional SVG attributes as keyword-arguments """ super(Marker, self).__init__(**extra) if insert is not None: self['refX'] = insert[0] self['refY'] = insert[1] if size is not None: self['markerWidth'] = size[0] self['markerHeight'] = size[1] if orient is not None: self['orient'] = orient if 'id' not in self.attribs: # an 'id' is necessary self['id'] = self.next_id() FONT_TEMPLATE = """@font-face{{ font-family: "{name}"; src: url("{data}"); }} """ class SVG(Symbol): """ A SVG document fragment consists of any number of SVG elements contained within an **svg** element. An SVG document fragment can range from an empty fragment (i.e., no content inside of the **svg** element), to a very simple SVG document fragment containing a single SVG graphics element such as a **rect**, to a complex, deeply nested collection of container elements and graphics elements. """ elementname = 'svg' def __init__(self, insert=None, size=None, **extra): """ :param 2-tuple insert: insert position (**x**, **y**) :param 2-tuple size: (**width**, **height**) :param extra: additional SVG attributes as keyword-arguments """ super(SVG, self).__init__(**extra) if insert is not None: self['x'] = insert[0] self['y'] = insert[1] if size is not None: self['width'] = size[0] self['height'] = size[1] self.defs = Defs(factory=self) # defs container self.add(self.defs) # add defs as first element def embed_stylesheet(self, content): """ Add <style> tag to the defs section. :param content: style sheet content as string :return: :class:`~svgwrite.container.Style` object """ return self.defs.add(Style(content)) def embed_font(self, name, filename): """ Embed font as base64 encoded data from font file. :param name: font name :param filename: file name of local stored font """ data = open(filename, 'rb').read() self._embed_font_data(name, data, font_mimetype(filename)) def embed_google_web_font(self, name, uri): """ Embed font as base64 encoded data acquired from google fonts. :param name: font name :param uri: google fonts request uri like 'http://fonts.googleapis.com/css?family=Indie+Flower' """ font_info = urlopen(uri).read() font_url = find_first_url(font_info.decode()) if font_url is None: raise ValueError("Got no font data from uri: '{}'".format(uri)) else: data = urlopen(font_url).read() self._embed_font_data(name, data, font_mimetype(font_url)) def _embed_font_data(self, name, data, mimetype): content = FONT_TEMPLATE.format(name=name, data=base64_data(data, mimetype)) self.embed_stylesheet(content) class Use(BaseElement, Transform, XLink, Presentation): """ The **use** element references another element and indicates that the graphical contents of that element is included/drawn at that given point in the document. Link to objects by href = ``'#object-id'`` or use the object itself as href-argument, if the given element has no **id** attribute it gets an automatic generated id. """ elementname = 'use' def __init__(self, href, insert=None, size=None, **extra): """ :param string href: object link (id-string) or an object with an id-attribute :param 2-tuple insert: insert point (**x**, **y**) :param 2-tuple size: (**width**, **height**) :param extra: additional SVG attributes as keyword-arguments """ super(Use, self).__init__(**extra) self.set_href(href) if insert is not None: self['x'] = insert[0] self['y'] = insert[1] if size is not None: self['width'] = size[0] self['height'] = size[1] def get_xml(self): self.update_id() # if href is an object - 'id' - attribute may be changed! return super(Use, self).get_xml() class Hyperlink(BaseElement, Transform, Presentation): """ The **a** element indicate links (also known as Hyperlinks or Web links). The remote resource (the destination for the link) is defined by a `<URI>` specified by the XLink **xlink:href** attribute. The remote resource may be any Web resource (e.g., an image, a video clip, a sound bite, a program, another SVG document, an HTML document, an element within the current document, an element within a different document, etc.). By activating these links (by clicking with the mouse, through keyboard input, voice commands, etc.), users may visit these resources. A **Hyperlink** is defined for each separate rendered element contained within the **Hyperlink** class; add sublements as usual with the `add` method. """ elementname = 'a' def __init__(self, href, target='_blank', **extra): """ :param string href: hyperlink to the target resource :param string target: ``'_blank|_replace|_self|_parent|_top|<XML-name>'`` :param extra: additional SVG attributes as keyword-arguments """ super(Hyperlink, self).__init__(**extra) self['xlink:href'] = href self['target'] = target class Script(BaseElement): """ The **script** element indicate links to a client-side language. This is normally a (also known as Hyperlinks or Web links). The remote resource (the source of the script) is defined by a `<URI>` specified by the XLink **xlink:href** attribute. The remote resource must be a text-file that contains the script contents. This script can be used within the SVG file by catching events or adding the mouseover/mousedown/ mouseup elements to the markup. """ elementname = 'script' def __init__(self, href=None, content="", **extra): """ :param string href: hyperlink to the target resource or *None* if using *content* :param string content: script content :param extra: additional attributes as keyword-arguments Use *href* **or** *content*, but not both at the same time. """ # removed type parameter, default is "application/ecmascript" super(Script, self).__init__(**extra) if href is not None: self['xlink:href'] = href self._content = content def get_xml(self): xml = super(Script, self).get_xml() if self._content: xml.append(CDATA(self._content)) return xml def append(self, content): """ Append content to the existing element-content. """ self._content += content class Style(Script): """ The *style* element allows style sheets to be embedded directly within SVG content. SVG's *style* element has the same attributes as the corresponding element in HTML. """ elementname = 'style' def __init__(self, content="", **extra): """ :param string content: stylesheet content """ super(Style, self).__init__(content=content, **extra) self['type'] = "text/css"