Forum Debian Users Gang

#!/usr/bin/python

#***************************************************************************
#*                                                                         *
#*   Copyright (c) 2010 Yorik van Havre <yorik@uncreated.net>              *  
#*                                                                         *
#*   This program is free software; you can redistribute it and/or modify  *
#*   it under the terms of the GNU General Public License (GPL)            *
#*   as published by the Free Software Foundation; either version 2 of     *
#*   the License, or (at your option) any later version.                   *
#*   for detail see the LICENCE text file.                                 *
#*                                                                         *
#*   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 Library General Public License for more details.                  *
#*                                                                         *
#*   You should have received a copy of the GNU Library 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                                                                   *
#*                                                                         *
#***************************************************************************

__title__="DXF thumbnailer utility"
__author__ = "Yorik van Havre <yorik@uncreated.net>"
__url__ = "http://yorik.uncreated.net"
__version__ = '0.1 - 11.10.2010'

'''
Linux DXF thumbnailer.

This application generates a 128x128px PNG image showing the contents of a DXF
file. In order to speed up the image generation process, only a few types of
entities are read, so complex files might not get rendered accurately or even
fail to render.

In order to use this program, you must configure your file manager to use it
as a thumbnailer for dxf file type (mime type: image/x-dxf).
'''

import sys, getopt, gnomevfs, Image, ImageDraw

opt,par = getopt.getopt(sys.argv[1:],'-s:')
inpfile = gnomevfs.get_local_path_from_uri(par[0])
outfile = par[1]
# inpfile = par[0]
# outfile = 'test.png'

try:
    objects = []
    currentobject = []
    command = None
    store = None
    startentities = False
    xmin = 0
    xmax = 0
    ymin = 0
    ymax = 0
    dxf = open(inpfile)
    for l in dxf.readlines():
        fline = l.strip()
        if fline == 'ENTITIES': startentities = True
        if not startentities: continue
        if not command:
            if fline == 'POLYLINE' or fline == 'LWPOLYLINE':
                vertexmode = False
                command = 'polyline'
                currentobject.append(command)
            elif fline == 'LINE':
                command = 'line'
                currentobject.append(command)
            elif fline == 'ARC':
                command = 'arc'
                currentobject.append(command)
            elif fline == 'CIRCLE':
                command = 'circle'
                currentobject.append(command)
        elif command == 'line':
            if not store:
                if fline == '10': store = 'x'
                elif fline == '20': store = 'y'
                elif fline == '11': store = 'x'
                elif fline == '21': store = 'y'
            else:
                num = float(fline)
                currentobject.append(num)
                if store == 'x':
                    if num < xmin: xmin = num
                    if num > xmax: xmax = num
                elif store == 'y':
                    if num < ymin: ymin = num
                    if num > ymax: ymax = num
                store = None
            if len(currentobject) == 5:
                objects.append(currentobject)
                currentobject = []
                command = None
        elif command == 'arc':
            if not store:
                if fline == '10': store = 'x'
                elif fline == '20': store = 'y'
                elif fline == '40': store = 'other'
                elif fline == '50': store = 'other'
                elif fline == '51': store = 'other'
            else:
                num = float(fline)
                currentobject.append(num)
                if store == 'x':
                    if num < xmin: xmin = num
                    if num > xmax: xmax = num
                elif store == 'y':
                    if num < ymin: ymin = num
                    if num > ymax: ymax = num
                store = None
            if len(currentobject) == 6:
                objects.append(currentobject)
                currentobject = []
                command = None
        elif command == 'circle':
            if not store:
                if fline == '10': store = 'x'
                elif fline == '20': store = 'y'
                elif fline == '40': store = 'other'
            else:
                num = float(fline)
                currentobject.append(num)
                if store == 'x':
                    if num < xmin: xmin = num
                    if num > xmax: xmax = num
                elif store == 'y':
                    if num < ymin: ymin = num
                    if num > ymax: ymax = num
                store = None
            if len(currentobject) == 4:
                objects.append(currentobject)
                currentobject = []
                command = None
        elif command == 'polyline':
            if not store:
                if fline == 'VERTEX': vertexmode = True
                elif fline == '10' and vertexmode: store = 'x'
                elif fline == '20'and vertexmode: store = 'y'
                elif fline == 'SEQEND':
                    objects.append(currentobject)
                    currentobject = []
                    command = None
            else:
                num = float(fline)
                currentobject.append(num)
                if store == 'x':
                    if num < xmin: xmin = num
                    if num > xmax: xmax = num
                elif store == 'y':
                    if num < ymin: ymin = num
                    if num > ymax: ymax = num
                store = None

    print len(objects),"objects"
    print "bounding box",xmin,ymin,xmax,ymax
    
    sizex = xmax-xmin
    sizey = ymax-ymin
    image = Image.new('RGB',(128,128))
    draw = ImageDraw.Draw(image)

    draw.rectangle((0,0,128,128),fill='#ffffff')
    
    for ob in objects:
        print "drawing",ob
        if ob[0] == 'line':
            x1 = int(((ob[1]-xmin)/sizex)*128)
            y1 = 128-int(((ob[2]-ymin)/sizey)*128)
            x2 = int(((ob[3]-xmin)/sizex)*128)
            y2 = 128-int(((ob[4]-ymin)/sizey)*128)
            draw.line((x1,y1,x2,y2),fill=0)
        elif ob[0] == 'polyline':
            x1 = int(((ob[1]-xmin)/sizex)*128)
            y1 = 128-int(((ob[2]-ymin)/sizey)*128)
            done = False
            for p in ob[3:]:
                if not done:
                    lp = p
                else:
                    x2 = int(((lp-xmin)/sizex)*128)
                    y2 = 128-int(((p-ymin)/sizey)*128)
                    draw.line((x1,y1,x2,y2),fill=0)
                    x1 = x2
                    y1 = y2
                done = not(done)
        elif ob[0] == 'circle':
            x1 = int((((ob[1]-ob[3])-xmin)/sizex)*128)
            y1 = 128-int((((ob[2]-ob[3])-ymin)/sizey)*128)
            x2 = int((((ob[1]+ob[3])-xmin)/sizex)*128)
            y2 = 128-int((((ob[2]+ob[3])-ymin)/sizey)*128)
            draw.ellipse((x1,y2,x2,y1),outline=0)
        elif ob[0] == 'arc':
            x1 = int((((ob[1]-ob[3])-xmin)/sizex)*128)
            y1 = 128-int((((ob[2]-ob[3])-ymin)/sizey)*128)
            x2 = int((((ob[1]+ob[3])-xmin)/sizex)*128)
            y2 = 128-int((((ob[2]+ob[3])-ymin)/sizey)*128)
            start = int(ob[4])
            end = int(ob[5])
            draw.arc((x1,y2,x2,y1),start,end,fill=0)
            
    del draw
    image.save(outfile,'PNG')

except:
    sys.exit(1)

[Thumbnailer Entry]
TryExec=dxf-thumbnailer.py
Exec=dxf-thumbnailer.py %u %o %s
MimeType=image/x-dxf;image/vnd.dxf;image/vnd.dwg;image/x-dwg;application/dxf;