kopia lustrzana https://github.com/inkstitch/inkstitch
136 wiersze
3.3 KiB
Python
136 wiersze
3.3 KiB
Python
import simpletransform
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from ..i18n import _
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from ..utils import cache
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# modern versions of Inkscape use 96 pixels per inch as per the CSS standard
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PIXELS_PER_MM = 96 / 25.4
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# cribbed from inkscape-silhouette
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def parse_length_with_units(str):
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'''
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Parse an SVG value which may or may not have units attached
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This version is greatly simplified in that it only allows: no units,
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units of px, mm, and %. Everything else, it returns None for.
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There is a more general routine to consider in scour.py if more
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generality is ever needed.
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'''
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u = 'px'
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s = str.strip()
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if s[-2:] == 'px':
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s = s[:-2]
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elif s[-2:] == 'mm':
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u = 'mm'
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s = s[:-2]
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elif s[-2:] == 'pt':
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u = 'pt'
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s = s[:-2]
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elif s[-2:] == 'pc':
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u = 'pc'
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s = s[:-2]
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elif s[-2:] == 'cm':
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u = 'cm'
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s = s[:-2]
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elif s[-2:] == 'in':
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u = 'in'
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s = s[:-2]
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elif s[-1:] == '%':
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u = '%'
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s = s[:-1]
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try:
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v = float(s)
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except BaseException:
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raise ValueError(_("parseLengthWithUnits: unknown unit %s") % s)
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return v, u
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def convert_length(length):
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value, units = parse_length_with_units(length)
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if not units or units == "px":
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return value
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if units == 'pt':
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value /= 72
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units = 'in'
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if units == 'pc':
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value /= 6
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units = 'in'
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if units == 'cm':
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value *= 10
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units = 'mm'
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if units == 'mm':
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value = value / 25.4
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units = 'in'
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if units == 'in':
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# modern versions of Inkscape use CSS's 96 pixels per inch. When you
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# open an old document, inkscape will add a viewbox for you.
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return value * 96
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raise ValueError(_("Unknown unit: %s") % units)
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@cache
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def get_viewbox(svg):
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viewbox = svg.get('viewBox')
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if viewbox is None:
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viewbox = "0 0 0 0"
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return viewbox.strip().replace(',', ' ').split()
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@cache
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def get_doc_size(svg):
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width = svg.get('width')
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height = svg.get('height')
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if width == "100%" and height == "100%":
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# Some SVG editors set width and height to "100%". I can't find any
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# solid documentation on how one is supposed to interpret that, so
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# just ignore it and use the viewBox. That seems to have the intended
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# result anyway.
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width = None
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height = None
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if width is None or height is None:
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# fall back to the dimensions from the viewBox
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viewbox = get_viewbox(svg)
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width = viewbox[2]
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height = viewbox[3]
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doc_width = convert_length(width)
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doc_height = convert_length(height)
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return doc_width, doc_height
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@cache
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def get_viewbox_transform(node):
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# somewhat cribbed from inkscape-silhouette
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doc_width, doc_height = get_doc_size(node)
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viewbox = get_viewbox(node)
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dx = -float(viewbox[0])
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dy = -float(viewbox[1])
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transform = simpletransform.parseTransform("translate(%f, %f)" % (dx, dy))
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try:
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sx = doc_width / float(viewbox[2])
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sy = doc_height / float(viewbox[3])
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scale_transform = simpletransform.parseTransform("scale(%f, %f)" % (sx, sy))
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transform = simpletransform.composeTransform(transform, scale_transform)
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except ZeroDivisionError:
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pass
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return transform
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