# coding=utf-8
#
# Copyright (C) 2005 Aaron Spike, aaron@ekips.org
#
# 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.
#
import math
from .utils import X, Y
[docs]def interpcoord(coord_a, coord_b, time):
"""Interpolate single coordinate by the amount of time"""
return coord_a + ((coord_b - coord_a) * time)
[docs]def interppoints(point1, point2, time):
"""Interpolate coordinate points by amount of time"""
return [interpcoord(point1[X], point2[X], time), interpcoord(point1[Y], point2[Y], time)]
[docs]def tweenstylefloat(prop, start, end, time):
sp = float(start[prop])
ep = float(end[prop])
return str(sp + (time * (ep - sp)))
[docs]def tweenstyleunit(svg, prop, start, end, time): # moved here so we can call 'unittouu'
scale = svg.unittouu('1px')
sp = svg.unittouu(start.get(prop, '1px')) / scale
ep = svg.unittouu(end.get(prop, '1px')) / scale
return str(sp + (time * (ep - sp)))
[docs]def tweenstylecolor(prop, start, end, time):
sr, sg, sb = parsecolor(start[prop])
er, eg, eb = parsecolor(end[prop])
return '#%s%s%s' % (tweenhex(time, sr, er), tweenhex(time, sg, eg), tweenhex(time, sb, eb))
[docs]def tweenhex(time, s, e):
s = float(int(s, 16))
e = float(int(e, 16))
retval = hex(int(math.floor(s + (time * (e - s)))))[2:]
if len(retval) == 1:
retval = '0%s' % retval
return retval
[docs]def parsecolor(c):
r, g, b = '0', '0', '0'
if c[:1] == '#':
if len(c) == 4:
r, g, b = c[1:2], c[2:3], c[3:4]
elif len(c) == 7:
r, g, b = c[1:3], c[3:5], c[5:7]
return r, g, b