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pathmodifier.py

#!/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

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