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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) 2014, Nicolas P. Rougier
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
import re
import math
from . base import units
from .. import logger
class Length(object):
def __init__(self, content, mode='x', parent=None):
if not content:
self._unit = None
self._value = 0
self._computed_value = 0
return
re_number = r'[-+]?(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][-+]?\d+)?'
re_unit = r'em|ex|px|in|cm|mm|pt|pc|%'
re_length = r'(?P<value>%s)\s*(?P<unit>%s)*' % (re_number, re_unit)
match = re.match(re_length, content)
if match:
self._value = float(match.group("value"))
self._unit = match.group("unit") or "px"
else:
self._value = 0.0
self._unit = None
scale = 1
if self._unit == '%':
if not parent:
logger.warn("No parent for computing length using percent")
elif hasattr(parent, 'viewport'):
w, h = parent.viewport
if mode == 'x':
scale = w
elif mode == 'y':
scale = h
elif mode == 'xy':
scale = math.sqrt(w * w + h * h) / math.sqrt(2.0)
else:
logger.warn("Parent doesn't have a viewport")
self._computed_value = self._value * units[self._unit] * scale
def __float__(self):
return self._computed_value
@property
def value(self):
return self._computed_value
def __repr__(self):
if self._unit:
return "%g%s" % (self._value, self._unit)
else:
return "%g" % (self._value)
class XLength(Length):
def __init__(self, content, parent=None):
Length.__init__(self, content, 'x', parent)
class YLength(Length):
def __init__(self, content, parent=None):
Length.__init__(self, content, 'y', parent)
class XYLength(Length):
def __init__(self, content, parent=None):
Length.__init__(self, content, 'xy', parent)
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