coloreffect.py revision 80a6f8321e8b2d512ba522d460380739a07ee07d
#!/usr/bin/env python
'''
Copyright (C) 2006 Jos Hirth, kaioa.com
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
'''
import sys, copy, optparse, simplestyle, inkex
import xml.xpath
import random
color_props_fill=('fill:','stop-color:','flood-color:','lighting-color:')
color_props_stroke=('stroke:',)
color_props = color_props_fill + color_props_stroke
class ColorEffect(inkex.Effect):
def __init__(self):
inkex.Effect.__init__(self,use_minidom=True)
self.visited = []
def effect(self):
if len(self.selected)==0:
self.getAttribs(self.document)
else:
for id,node in self.selected.iteritems():
self.getAttribs(node)
def getAttribs(self,node):
self.changeStyle(node)
if node.hasChildNodes():
childs=node.childNodes
for child in childs:
self.getAttribs(child)
def changeStyle(self,node):
if node.hasAttributes():
style=node.getAttribute('style') # fixme: this will break for presentation attributes!
if style!='':
#inkex.debug('old style:'+style)
styles=style.split(';')
for i in range(len(styles)):
for c in range(len(color_props)):
if styles[i].startswith(color_props[c]):
styles[i]=color_props[c]+self.process_prop(styles[i][len(color_props[c]):])
#inkex.debug('new style:'+';'.join(styles))
node.setAttribute('style',';'.join(styles))
def process_prop(self,col):
#debug('got:'+col)
if simplestyle.isColor(col):
c=simplestyle.parseColor(col)
col='#'+self.colmod(c[0],c[1],c[2])
#debug('made:'+col)
if col.startswith('url(#'):
id = col[len('url(#'):col.find(')')]
newid = '%s-%d' % (id, int(random.random() * 1000))
#inkex.debug('ID:' + id )
path = '//*[@id="%s"]' % id
for node in xml.xpath.Evaluate(path,self.document):
self.process_gradient(node, newid)
col = 'url(#%s)' % newid
return col
def process_gradient(self, node, newid):
#if node.hasAttributes():
#this_id=node.getAttribute('id')
#if this_id in self.visited:
## prevent multiple processing of the same gradient if it is used by more than one selected object
##inkex.debug("already had: " + this_id)
#return
#self.visited.append(this_id)
#inkex.debug("visited: " + str(self.visited))
newnode = node.cloneNode(True)
newnode.setAttribute('id', newid)
node.parentNode.appendChild(newnode)
self.changeStyle(newnode)
if newnode.hasChildNodes():
for child in newnode.childNodes:
self.changeStyle(child)
if newnode.hasAttributes():
href=newnode.getAttribute('xlink:href')
if href.startswith('#'):
id = href[len('#'):len(href)]
#inkex.debug('ID:' + id )
newhref = '%s-%d' % (id, int(random.random() * 1000))
newnode.setAttribute('xlink:href', '#%s' % newhref)
path = '//*[@id="%s"]' % id
for node in xml.xpath.Evaluate(path,self.document):
self.process_gradient(node, newhref)
def colmod(self,r,g,b):
pass
def rgb_to_hsl(self,r, g, b):
rgb_max = max (max (r, g), b)
rgb_min = min (min (r, g), b)
delta = rgb_max - rgb_min
hsl = [0.0, 0.0, 0.0]
hsl[2] = (rgb_max + rgb_min)/2.0
if delta == 0:
hsl[0] = 0.0
hsl[1] = 0.0
else:
if hsl[2] <= 0.5:
hsl[1] = delta / (rgb_max + rgb_min)
else:
hsl[1] = delta / (2 - rgb_max - rgb_min)
if r == rgb_max:
hsl[0] = (g - b) / delta
else:
if g == rgb_max:
hsl[0] = 2.0 + (b - r) / delta
else:
if b == rgb_max:
hsl[0] = 4.0 + (r - g) / delta
hsl[0] = hsl[0] / 6.0
if hsl[0] < 0:
hsl[0] = hsl[0] + 1
if hsl[0] > 1:
hsl[0] = hsl[0] - 1
return hsl
def hue_2_rgb (self, v1, v2, h):
if h < 0:
h += 6.0
if h > 6:
h -= 6.0
if h < 1:
return v1 + (v2 - v1) * h
if h < 3:
return v2
if h < 4:
return v1 + (v2 - v1) * (4 - h)
return v1
def hsl_to_rgb (self,h, s, l):
rgb = [0, 0, 0]
if s == 0:
rgb[0] = l
rgb[1] = l
rgb[2] = l
else:
if l < 0.5:
v2 = l * (1 + s)
else:
v2 = l + s - l*s
v1 = 2*l - v2
rgb[0] = self.hue_2_rgb (v1, v2, h*6 + 2.0)
rgb[1] = self.hue_2_rgb (v1, v2, h*6)
rgb[2] = self.hue_2_rgb (v1, v2, h*6 - 2.0)
return rgb