From b537f26600e0f7924eb1088903cca14402da987d Mon Sep 17 00:00:00 2001 From: buliabyak Date: Thu, 11 Jan 2007 18:09:30 +0000 Subject: [PATCH] perspective --- share/extensions/Makefile.am | 6 +- share/extensions/perspective.inx | 15 ++++ share/extensions/perspective.py | 123 +++++++++++++++++++++++++++++++ 3 files changed, 142 insertions(+), 2 deletions(-) create mode 100644 share/extensions/perspective.inx create mode 100755 share/extensions/perspective.py diff --git a/share/extensions/Makefile.am b/share/extensions/Makefile.am index 120df7aed..cdaf97ac5 100644 --- a/share/extensions/Makefile.am +++ b/share/extensions/Makefile.am @@ -78,7 +78,8 @@ extensions = \ rubberstretch.py\ pathmodifier.py\ g2pngs.py\ - ffgeom.py + ffgeom.py\ + perspective.py otherstuff = \ @@ -151,7 +152,8 @@ modules = \ color_morehue.inx\ color_lesshue.inx\ pathalongpath.inx\ - g2pngs.inx + g2pngs.inx\ + perspective.inx extension_SCRIPTS = \ diff --git a/share/extensions/perspective.inx b/share/extensions/perspective.inx new file mode 100644 index 000000000..1f0d9b141 --- /dev/null +++ b/share/extensions/perspective.inx @@ -0,0 +1,15 @@ + + <_name>Perspective + org.ekips.filter.perspective + perspective.py + inkex.py + + path + + + + + + diff --git a/share/extensions/perspective.py b/share/extensions/perspective.py new file mode 100755 index 000000000..7fab641ab --- /dev/null +++ b/share/extensions/perspective.py @@ -0,0 +1,123 @@ +#!/usr/bin/env python +""" +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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +Perspective approach & math by Dmitry Platonov, shadowjack@mail.ru, 2006 +""" +import sys, inkex, os, re, simplepath, cubicsuperpath +from ffgeom import * +from numpy import * +from numpy.linalg import * + +uuconv = {'in':90.0, 'pt':1.25, 'px':1, 'mm':3.5433070866, 'cm':35.433070866, 'pc':15.0} +def unittouu(string): + unit = re.compile('(%s)$' % '|'.join(uuconv.keys())) + param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)') + + p = param.match(string) + u = unit.search(string) + if p: + retval = float(p.string[p.start():p.end()]) + else: + retval = 0.0 + if u: + try: + return retval * uuconv[u.string[u.start():u.end()]] + except KeyError: + pass + return retval + +class Project(inkex.Effect): + def __init__(self): + inkex.Effect.__init__(self) + def effect(self): + if len(self.options.ids) < 2: + inkex.debug("Requires two selected paths. The second must be exctly four nodes long.") + exit() + + #obj is selected second + obj = self.selected[self.options.ids[0]] + envelope = self.selected[self.options.ids[1]] + if (obj.tagName == 'path' or obj.tagName == 'g') and envelope.tagName == 'path': + path = cubicsuperpath.parsePath(envelope.attributes.getNamedItem('d').value) + dp = zeros((4,2), dtype=float64) + for i in range(4): + dp[i][0] = path[0][i][1][0] + dp[i][1] = path[0][i][1][1] + + #query inkscape about the bounding box of obj + q = {'x':0,'y':0,'width':0,'height':0} + file = self.args[-1] + id = self.options.ids[0] + for query in q.keys(): + f = os.popen("inkscape --query-%s --query-id=%s %s" % (query,id,file)) + q[query] = float(f.read()) + f.close() + sp = array([[q['x'], q['y']+q['height']],[q['x'], q['y']],[q['x']+q['width'], q['y']],[q['x']+q['width'], q['y']+q['height']]], dtype=float64) + + solmatrix = zeros((8,8), dtype=float64) + free_term = zeros((8), dtype=float64) + for i in (0,1,2,3): + solmatrix[i][0] = sp[i][0] + solmatrix[i][1] = sp[i][1] + solmatrix[i][2] = 1 + solmatrix[i][6] = -dp[i][0]*sp[i][0] + solmatrix[i][7] = -dp[i][0]*sp[i][1] + solmatrix[i+4][3] = sp[i][0] + solmatrix[i+4][4] = sp[i][1] + solmatrix[i+4][5] = 1 + solmatrix[i+4][6] = -dp[i][1]*sp[i][0] + solmatrix[i+4][7] = -dp[i][1]*sp[i][1] + free_term[i] = dp[i][0] + free_term[i+4] = dp[i][1] + + res = solve(solmatrix, free_term) + projmatrix = array([[res[0],res[1],res[2]],[res[3],res[4],res[5]],[res[6],res[7],1.0]],dtype=float64) + if obj.tagName == "path": + self.process_path(obj,projmatrix) + if obj.tagName == "g": + self.process_group(obj,projmatrix) + + + def process_group(self,group,m): + for node in group.childNodes: + if node.nodeType==node.ELEMENT_NODE: + if node.tagName == 'path': + self.process_path(node,m) + if node.tagName == 'g': + self.process_group(node,m) + + + def process_path(self,path,m): + d = path.attributes.getNamedItem('d') + p = cubicsuperpath.parsePath(d.value) + for subs in p: + for csp in subs: + csp[0] = self.project_point(csp[0],m) + csp[1] = self.project_point(csp[1],m) + csp[2] = self.project_point(csp[2],m) + d.value = cubicsuperpath.formatPath(p) + + + + def project_point(self,p,m): + x = p[0] + y = p[1] + return [(x*m[0][0] + y*m[0][1] + m[0][2])/(x*m[2][0]+y*m[2][1]+m[2][2]),(x*m[1][0] + y*m[1][1] + m[1][2])/(x*m[2][0]+y*m[2][1]+m[2][2])] + +e = Project() +e.affect() -- 2.30.2