299 lines
10 KiB
Python
299 lines
10 KiB
Python
#!/usr/bin/env python
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#coding:utf-8
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# Author: mozman --<mozman@gmx.at>
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# Purpose: mixins
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# Created: 19.10.2010
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# Copyright (C) 2010, Manfred Moitzi
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# License: MIT License
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from svgwrite.utils import strlist
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from svgwrite.utils import is_string
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_horiz = {'center': 'xMid', 'left': 'xMin', 'right': 'xMax'}
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_vert = {'middle': 'YMid', 'top': 'YMin', 'bottom':'YMax'}
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class ViewBox(object):
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""" The **ViewBox** mixin provides the ability to specify that a
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given set of graphics stretch to fit a particular container element.
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The value of the **viewBox** attribute is a list of four numbers
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**min-x**, **min-y**, **width** and **height**, separated by whitespace
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and/or a comma, which specify a rectangle in **user space** which should
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be mapped to the bounds of the viewport established by the given element,
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taking into account attribute **preserveAspectRatio**.
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"""
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def viewbox(self, minx=0, miny=0, width=0, height=0):
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""" Specify a rectangle in **user space** (no units allowed) which
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should be mapped to the bounds of the viewport established by the
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given element.
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:param number minx: left border of the viewBox
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:param number miny: top border of the viewBox
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:param number width: width of the viewBox
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:param number height: height of the viewBox
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"""
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self['viewBox'] = strlist( [minx, miny, width, height] )
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def stretch(self):
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""" Stretch viewBox in x and y direction to fill viewport, does not
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preserve aspect ratio.
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"""
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self['preserveAspectRatio'] = 'none'
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def fit(self, horiz="center", vert="middle", scale="meet"):
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""" Set the **preserveAspectRatio** attribute.
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:param string horiz: horizontal alignment ``'left | center | right'``
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:param string vert: vertical alignment ``'top | middle | bottom'``
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:param string scale: scale method ``'meet | slice'``
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============= =======================================================
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Scale methods Description
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============= =======================================================
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``'meet'`` preserve aspect ration and zoom to limits of viewBox
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``'slice'`` preserve aspect ration and viewBox touch viewport on
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all bounds, viewBox will extend beyond the bounds of
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the viewport
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============= =======================================================
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"""
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if self.debug and scale not in ('meet', 'slice'):
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raise ValueError("Invalid scale parameter '%s'" % scale)
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self['preserveAspectRatio'] = "%s%s %s" % (_horiz[horiz],_vert[vert], scale)
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class Transform(object):
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""" The **Transform** mixin operates on the **transform** attribute.
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The value of the **transform** attribute is a `<transform-list>`, which
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is defined as a list of transform definitions, which are applied in the
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order provided. The individual transform definitions are separated by
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whitespace and/or a comma. All coordinates are **user
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space coordinates**.
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"""
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transformname = 'transform'
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def translate(self, tx, ty=None):
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"""
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Specifies a translation by **tx** and **ty**. If **ty** is not provided,
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it is assumed to be zero.
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:param number tx: user coordinate - no units allowed
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:param number ty: user coordinate - no units allowed
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"""
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self._add_transformation("translate(%s)" % strlist( [tx, ty] ))
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def rotate(self, angle, center=None):
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"""
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Specifies a rotation by **angle** degrees about a given point.
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If optional parameter **center** are not supplied, the rotate is
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about the origin of the current user coordinate system.
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:param number angle: rotate-angle in degrees
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:param 2-tuple center: rotate-center as user coordinate - no units allowed
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"""
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self._add_transformation("rotate(%s)" % strlist( [angle, center] ))
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def scale(self, sx, sy=None):
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"""
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Specifies a scale operation by **sx** and **sy**. If **sy** is not
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provided, it is assumed to be equal to **sx**.
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:param number sx: scalar factor x-axis, no units allowed
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:param number sy: scalar factor y-axis, no units allowed
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"""
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self._add_transformation("scale(%s)" % strlist([sx, sy]))
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def skewX(self, angle):
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""" Specifies a skew transformation along the x-axis.
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:param number angle: skew-angle in degrees, no units allowed
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"""
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self._add_transformation("skewX(%s)" % angle)
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def skewY(self, angle):
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""" Specifies a skew transformation along the y-axis.
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:param number angle: skew-angle in degrees, no units allowed
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"""
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self._add_transformation("skewY(%s)" % angle)
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def matrix(self, a, b, c, d, e, f):
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self._add_transformation("matrix(%s)" % strlist( [a, b, c, d, e, f] ))
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def _add_transformation(self, new_transform):
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old_transform = self.attribs.get(self.transformname, '')
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self[self.transformname] = ("%s %s" % (old_transform, new_transform)).strip()
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class XLink(object):
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""" XLink mixin """
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def set_href(self, element):
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"""
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Create a reference to **element**.
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:param element: if element is a `string` its the **id** name of the
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referenced element, if element is a **BaseElement** class the **id**
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SVG Attribute is used to create the reference.
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"""
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self.href = element
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self.update_id()
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def set_xlink(self, title=None, show=None, role=None, arcrole=None):
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""" Set XLink attributes (for `href` use :meth:`set_href`).
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"""
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if role is not None:
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self['xlink:role'] = role
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if arcrole is not None:
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self['xlink:arcrole'] = arcrole
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if title is not None:
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self['xlink:title'] = title
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if show is not None:
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self['xlink:show'] = show
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def update_id(self):
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if not hasattr(self, 'href'):
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return
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if is_string(self.href):
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idstr = self.href
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else:
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idstr = self.href.get_iri()
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self.attribs['xlink:href'] = idstr
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class Presentation(object):
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"""
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Helper methods to set presentation attributes.
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"""
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def fill(self, color=None, rule=None, opacity=None):
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"""
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Set SVG Properties **fill**, **fill-rule** and **fill-opacity**.
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"""
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if color is not None:
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if is_string(color):
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self['fill'] = color
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else:
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self['fill'] = color.get_paint_server()
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if rule is not None:
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self['fill-rule'] = rule
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if opacity is not None:
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self['fill-opacity'] = opacity
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return self
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def stroke(self, color=None, width=None, opacity=None, linecap=None,
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linejoin=None, miterlimit=None):
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"""
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Set SVG Properties **stroke**, **stroke-width**, **stroke-opacity**,
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**stroke-linecap** and **stroke-miterlimit**.
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"""
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if color is not None:
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if is_string(color):
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self['stroke'] = color
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else:
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self['stroke'] = color.get_paint_server()
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if width is not None:
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self['stroke-width'] = width
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if opacity is not None:
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self['stroke-opacity'] = opacity
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if linecap is not None:
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self['stroke-linecap'] = linecap
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if linejoin is not None:
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self['stroke-linejoin'] = linejoin
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if miterlimit is not None:
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self['stroke-miterlimit'] = miterlimit
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return self
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def dasharray(self, dasharray=None, offset=None):
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"""
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Set SVG Properties **stroke-dashoffset** and **stroke-dasharray**.
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Where *dasharray* specify the lengths of alternating dashes and gaps as
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<list> of <int> or <float> values or a <string> of comma and/or white
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space separated <lengths> or <percentages>. (e.g. as <list> dasharray=[1, 0.5]
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or as <string> dasharray='1 0.5')
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"""
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if dasharray is not None:
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self['stroke-dasharray'] = strlist(dasharray, ' ')
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if offset is not None:
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self['stroke-dashoffset'] = offset
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return self
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class MediaGroup(object):
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"""
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Helper methods to set media group attributes.
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"""
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def viewport_fill(self, color=None, opacity=None):
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"""
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Set SVG Properties **viewport-fill** and **viewport-fill-opacity**.
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"""
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if color is not None:
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self['viewport-fill'] = color
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if opacity is not None:
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self['viewport-fill-opacity'] = opacity
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return self
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class Markers(object):
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"""
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Helper methods to set marker attributes.
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"""
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def set_markers(self, markers):
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"""
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Set markers for line elements (line, polygon, polyline, path) to
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values specified by `markers`.
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* if `markers` is a 3-tuple:
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* attribute 'marker-start' = markers[0]
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* attribute 'marker-mid' = markers[1]
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* attribute 'marker-end' = markers[2]
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* `markers` is a `string` or a `Marker` class:
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* attribute 'marker' = `FuncIRI` of markers
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"""
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def get_funciri(value):
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if is_string(value):
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# strings has to be a valid reference including the '#'
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return 'url(%s)' % value
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else:
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# else create a reference to the object '#id'
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return 'url(#%s)' % value['id']
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if is_string(markers):
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self['marker'] = get_funciri(markers)
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else:
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try:
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start_marker, mid_marker, end_marker = markers
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if start_marker:
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self['marker-start'] = get_funciri(start_marker)
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if mid_marker:
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self['marker-mid'] = get_funciri(mid_marker)
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if end_marker:
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self['marker-end'] = get_funciri(end_marker)
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except (TypeError, KeyError):
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self['marker'] = get_funciri(markers)
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class Clipping(object):
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def clip_rect(self, top='auto', right='auto', bottom='auto', left='auto'):
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"""
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Set SVG Property **clip**.
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"""
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self['clip'] = "rect(%s,%s,%s,%s)" % (top, right, bottom, left)
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