#!/usr/bin/env python ''' Copyright (C) 2006 Jean-Francois Barraud, barraud@math.univ-lille1.fr 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 barraud@math.univ-lille1.fr This code defines a basic class (PathModifier) of effects whose purpose is to somehow deform given objects: one common tasks for all such effect is to convert shapes, groups, clones to paths. The class has several functions to make this (more or less!) easy. As an exemple, a second class (Diffeo) is derived from it, to implement deformations of the form X=f(x,y), Y=g(x,y)... TODO: Several handy functions are defined, that might in fact be of general interest and that should be shipped out in separate files... ''' import inkex, cubicsuperpath, bezmisc, simplestyle from simpletransform import * import copy, math, re, random import gettext _ = gettext.gettext #################################################################### ##-- zOrder computation... ##-- this should be shipped out in a separate file. inkex.py? def zSort(inNode,idList): sortedList=[] theid = inNode.get("id") if theid in idList: sortedList.append(theid) for child in inNode: if len(sortedList)==len(idList): break sortedList+=zSort(child,idList) return sortedList class PathModifier(inkex.Effect): def __init__(self): inkex.Effect.__init__(self) ################################## #-- Selectionlists manipulation -- ################################## def duplicateNodes(self, aList): clones={} for id,node in aList.iteritems(): clone=copy.deepcopy(node) #!!!--> should it be given an id? #seems to work without this!?! myid = node.tag.split('}')[-1] clone.set("id", self.uniqueId(myid)) node.getparent().append(clone) clones[clone.get("id")]=clone return(clones) def uniqueId(self, prefix): id="%s%04i"%(prefix,random.randint(0,9999)) while len(self.document.getroot().xpath('//*[@id="%s"]' % id,namespaces=inkex.NSS)): id="%s%04i"%(prefix,random.randint(0,9999)) return(id) def expandGroups(self,aList,transferTransform=True): for id, node in aList.items(): if node.tag == inkex.addNS('g','svg') or node.tag=='g': mat=parseTransform(node.get("transform")) for child in node: if transferTransform: applyTransformToNode(mat,child) aList.update(self.expandGroups({child.get('id'):child})) if transferTransform and node.get("transform"): del node.attrib["transform"] del aList[id] return(aList) def expandGroupsUnlinkClones(self,aList,transferTransform=True,doReplace=True): for id in aList.keys()[:]: node=aList[id] if node.tag == inkex.addNS('g','svg') or node.tag=='g': self.expandGroups(aList,transferTransform) self.expandGroupsUnlinkClones(aList,transferTransform,doReplace) #Hum... not very efficient if there are many clones of groups... elif node.tag == inkex.addNS('use','svg') or node.tag=='use': refnode=self.refNode(node) newnode=self.unlinkClone(node,doReplace) del aList[id] style = simplestyle.parseStyle(node.get('style') or "") refstyle=simplestyle.parseStyle(refnode.get('style') or "") style.update(refstyle) newnode.set('style',simplestyle.formatStyle(style)) newid=newnode.get('id') aList.update(self.expandGroupsUnlinkClones({newid:newnode},transferTransform,doReplace)) return aList def recursNewIds(self,node): if node.get('id'): node.set('id',self.uniqueId(node.tag)) for child in node: self.recursNewIds(child) def refNode(self,node): if node.get(inkex.addNS('href','xlink')): refid=node.get(inkex.addNS('href','xlink')) path = '//*[@id="%s"]' % refid[1:] newNode = self.document.getroot().xpath(path, namespaces=inkex.NSS)[0] return newNode else: raise AssertionError, "Trying to follow empty xlink.href attribute." def unlinkClone(self,node,doReplace): if node.tag == inkex.addNS('use','svg') or node.tag=='use': newNode = copy.deepcopy(self.refNode(node)) self.recursNewIds(newNode) applyTransformToNode(parseTransform(node.get('transform')),newNode) if doReplace: parent=node.getparent() parent.insert(parent.index(node),newNode) parent.remove(node) return newNode else: raise AssertionError, "Only clones can be unlinked..." ################################ #-- Object conversion ---------- ################################ def rectToPath(self,node,doReplace=True): if node.tag == inkex.addNS('rect','svg'): x =float(node.get('x')) y =float(node.get('y')) #FIXME: no exception anymore and sometimes just one try: rx=float(node.get('rx')) ry=float(node.get('ry')) except: rx=0 ry=0 w =float(node.get('width' )) h =float(node.get('height')) d ='M %f,%f '%(x+rx,y) d+='L %f,%f '%(x+w-rx,y) d+='A %f,%f,%i,%i,%i,%f,%f '%(rx,ry,0,0,1,x+w,y+ry) d+='L %f,%f '%(x+w,y+h-ry) d+='A %f,%f,%i,%i,%i,%f,%f '%(rx,ry,0,0,1,x+w-rx,y+h) d+='L %f,%f '%(x+rx,y+h) d+='A %f,%f,%i,%i,%i,%f,%f '%(rx,ry,0,0,1,x,y+h-ry) d+='L %f,%f '%(x,y+ry) d+='A %f,%f,%i,%i,%i,%f,%f '%(rx,ry,0,0,1,x+rx,y) newnode=inkex.etree.Element('path') newnode.set('d',d) newnode.set('id', self.uniqueId('path')) newnode.set('style',node.get('style')) nnt = node.get('transform') if nnt: newnode.set('transform',nnt) fuseTransform(newnode) if doReplace: parent=node.getparent() parent.insert(parent.index(node),newnode) parent.remove(node) return newnode def groupToPath(self,node,doReplace=True): if node.tag == inkex.addNS('g','svg'): newNode = inkex.etree.SubElement(self.current_layer,inkex.addNS('path','svg')) newstyle = simplestyle.parseStyle(node.get('style') or "") newp = [] for child in node: childstyle = simplestyle.parseStyle(child.get('style') or "") childstyle.update(newstyle) newstyle.update(childstyle) childAsPath = self.objectToPath(child,False) newp += cubicsuperpath.parsePath(childAsPath.get('d')) newNode.set('d',cubicsuperpath.formatPath(newp)) newNode.set('style',simplestyle.formatStyle(newstyle)) self.current_layer.remove(newNode) if doReplace: parent=node.getparent() parent.insert(parent.index(node),newNode) parent.remove(node) return newNode else: raise AssertionError def objectToPath(self,node,doReplace=True): #--TODO: support other object types!!!! #--TODO: make sure cubicsuperpath supports A and Q commands... if node.tag == inkex.addNS('rect','svg'): return(self.rectToPath(node,doReplace)) if node.tag == inkex.addNS('g','svg'): return(self.groupToPath(node,doReplace)) elif node.tag == inkex.addNS('path','svg') or node.tag == 'path': #remove inkscape attributes, otherwise any modif of 'd' will be discarded! for attName in node.attrib.keys(): if ("sodipodi" in attName) or ("inkscape" in attName): del node.attrib[attName] fuseTransform(node) return node elif node.tag == inkex.addNS('use','svg') or node.tag == 'use': newNode = self.unlinkClone(node,doReplace) return self.objectToPath(newNode,doReplace) else: inkex.errormsg(_("Please first convert objects to paths! (Got [%s].)") % node.tag) return None def objectsToPaths(self,aList,doReplace=True): newSelection={} for id,node in aList.items(): newnode=self.objectToPath(node,doReplace) del aList[id] aList[newnode.get('id')]=newnode ################################ #-- Action ---------- ################################ #-- overwrite this method in subclasses... def effect(self): #self.duplicateNodes(self.selected) #self.expandGroupsUnlinkClones(self.selected, True) self.objectsToPaths(self.selected, True) self.bbox=computeBBox(self.selected.values()) for id, node in self.selected.iteritems(): if node.tag == inkex.addNS('path','svg'): d = node.get('d') p = cubicsuperpath.parsePath(d) #do what ever you want with p! node.set('d',cubicsuperpath.formatPath(p)) class Diffeo(PathModifier): def __init__(self): inkex.Effect.__init__(self) def applyDiffeo(self,bpt,vects=()): ''' bpt is a base point and for v in vectors, v'=v-p is a tangent vector at bpt. Defaults to identity! ''' for v in vects: v[0]-=bpt[0] v[1]-=bpt[1] #-- your transformations go here: #x,y=bpt #bpt[0]=f(x,y) #bpt[1]=g(x,y) #for v in vects: # vx,vy=v # v[0]=df/dx(x,y)*vx+df/dy(x,y)*vy # v[1]=dg/dx(x,y)*vx+dg/dy(x,y)*vy # #-- !caution! y-axis is pointing downward! for v in vects: v[0]+=bpt[0] v[1]+=bpt[1] def effect(self): #self.duplicateNodes(self.selected) self.expandGroupsUnlinkClones(self.selected, True) self.expandGroups(self.selected, True) self.objectsToPaths(self.selected, True) self.bbox=computeBBox(self.selected.values()) for id, node in self.selected.iteritems(): if node.tag == inkex.addNS('path','svg') or node.tag=='path': d = node.get('d') p = cubicsuperpath.parsePath(d) for sub in p: for ctlpt in sub: self.applyDiffeo(ctlpt[1],(ctlpt[0],ctlpt[2])) node.set('d',cubicsuperpath.formatPath(p)) #e = Diffeo() #e.affect() # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99