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Diffstat (limited to 'share/extensions/simpletransform.py')
| -rw-r--r-- | share/extensions/simpletransform.py | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/share/extensions/simpletransform.py b/share/extensions/simpletransform.py new file mode 100644 index 000000000..983874f7c --- /dev/null +++ b/share/extensions/simpletransform.py @@ -0,0 +1,164 @@ +#!/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 several functions to make handling of transform
+attribute easier.
+'''
+import inkex, cubicsuperpath, bezmisc, simplestyle
+import copy, math, re
+
+def parseTransform(transf,mat=[[1.0,0.0,0.0],[0.0,1.0,0.0]]):
+ if transf=="" or transf==None:
+ return(mat)
+ result=re.match("(translate|scale|rotate|skewX|skewY|matrix)\(([^)]*)\)",transf)
+#-- translate --
+ if result.group(1)=="translate":
+ args=result.group(2).split(",")
+ dx=float(args[0])
+ if len(args)==1:
+ dy=0.0
+ else:
+ dy=float(args[1])
+ matrix=[[1,0,dx],[0,1,dy]]
+#-- scale --
+ if result.groups(1)=="scale":
+ args=result.group(2).split(",")
+ sx=float(args[0])
+ if len(args)==1:
+ sy=sx
+ else:
+ sy=float(args[1])
+ matrix=[[sx,0,0],[0,sy,0]]
+#-- rotate --
+ if result.groups(1)=="rotate":
+ args=result.group(2).split(",")
+ a=float(args[0])*math.pi/180
+ if len(args)==1:
+ cx,cy=(0.0,0.0)
+ else:
+ cx,cy=args[1:]
+ matrix=[[math.cos(a),-math.sin(a),cx],[math.sin(a),math.cos(a),cy]]
+#-- skewX --
+ if result.groups(1)=="skewX":
+ a=float(result.group(2))*math.pi/180
+ matrix=[[1,math.tan(a),0],[0,1,0]]
+#-- skewX --
+ if result.groups(1)=="skewX":
+ a=float(result.group(2))*math.pi/180
+ matrix=[[1,0,0],[math.tan(a),1,0]]
+#-- matrix --
+ if result.group(1)=="matrix":
+ a11,a21,a12,a22,v1,v2=result.group(2).split(",")
+ matrix=[[float(a11),float(a12),float(v1)],[float(a21),float(a22),float(v2)]]
+
+ matrix=composeTransform(mat,matrix)
+ if result.end()<len(transf):
+ return(parseTransform(transf[result.end():],matrix))
+ else:
+ return matrix
+
+def formatTransform(mat):
+ return("matrix(%f,%f,%f,%f,%f,%f)"%(mat[0][0],mat[1][0],mat[0][1],mat[1][1],mat[0][2],mat[1][2]))
+
+def composeTransform(M1,M2):
+ a11=M1[0][0]*M2[0][0]+M1[0][1]*M2[1][0]
+ a12=M1[0][0]*M2[0][1]+M1[0][1]*M2[1][1]
+ a21=M1[1][0]*M2[0][0]+M1[1][1]*M2[1][0]
+ a22=M1[1][0]*M2[0][1]+M1[1][1]*M2[1][1]
+
+ v1=M1[0][0]*M2[0][2]+M1[0][1]*M2[1][2]+M1[0][2]
+ v2=M1[1][0]*M2[0][2]+M1[1][1]*M2[1][2]+M1[1][2]
+ return [[a11,a12,v1],[a21,a22,v2]]
+
+def applyTransformToNode(mat,node):
+ m=parseTransform(node.get("transform"))
+ newtransf=formatTransform(composeTransform(mat,m))
+ node.set("transform", newtransf)
+
+def applyTransformToPoint(mat,pt):
+ x=mat[0][0]*pt[0]+mat[0][1]*pt[1]+mat[0][2]
+ y=mat[1][0]*pt[0]+mat[1][1]*pt[1]+mat[1][2]
+ pt[0]=x
+ pt[1]=y
+
+def applyTransformToPath(mat,path):
+ for comp in path:
+ for ctl in comp:
+ for pt in ctl:
+ applyTransformToPoint(mat,pt)
+
+def fuseTransform(node):
+ if node.get('d')==None:
+ #FIX ME: how do you raise errors?
+ raise AssertionError, 'can not fuse "transform" of elements that have no "d" attribute'
+ t = node.get("transform")
+ if t == None:
+ return
+ m = parseTransform(t)
+ d = node.get('d')
+ p = cubicsuperpath.parsePath(d)
+ applyTransformToPath(m,p)
+ node.set('d', cubicsuperpath.formatPath(p))
+ del node.attrib["transform"]
+
+####################################################################
+##-- Some functions to compute a rough bbox of a given list of objects.
+##-- this should be shipped out in an separate file...
+
+def boxunion(b1,b2):
+ if b1 is None:
+ return b2
+ elif b2 is None:
+ return b1
+ else:
+ return((min(b1[0],b2[0]),max(b1[1],b2[1]),min(b1[2],b2[2]),max(b1[3],b2[3])))
+
+def roughBBox(path):
+ xmin,xMax,ymin,yMax=path[0][0][0][0],path[0][0][0][0],path[0][0][0][1],path[0][0][0][1]
+ for pathcomp in path:
+ for ctl in pathcomp:
+ for pt in ctl:
+ xmin=min(xmin,pt[0])
+ xMax=max(xMax,pt[0])
+ ymin=min(ymin,pt[1])
+ yMax=max(yMax,pt[1])
+ return xmin,xMax,ymin,yMax
+
+def computeBBox(aList,mat=[[1,0,0],[0,1,0]]):
+ bbox=None
+ for node in aList:
+ m = parseTransform(node.get('transform'))
+ m = composeTransform(mat,m)
+ #TODO: text not supported!
+ if node.get("d"):
+ d = node.get('d')
+ p = cubicsuperpath.parsePath(d)
+ applyTransformToPath(m,p)
+ bbox=boxunion(roughBBox(p),bbox)
+
+ if node.tag == inkex.addNS('use','svg') or node.tag=='use':
+ refid=node.get(inkex.addNS('href','xlink'))
+ path = '//*[@id="%s"]' % refid[1:]
+ refnode = node.getroottree().xpath(path,inkex.NSS)
+ bbox=boxunion(computeBBox(refnode,m),bbox)
+
+ bbox=boxunion(computeBBox(node,m),bbox)
+ return bbox
+
+
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