gzv.py

   1 # gzv.py - an user interface to generate-zooming-video
   2 #
   3 # Copyright (C) 2008  Lincoln de Sousa <lincoln@minaslivre.org>
   4 #
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14
  15 import os
  16 import gtk
  17 import gtk.glade
  18 import math
  19 import cairo
  20 from ConfigParser import ConfigParser
  21
  22 _ = lambda x:x
  23
  24 class Ball(object):
  25     DEFAULT_WIDTH = 10
  26
  27     def __init__(self, x, y, r, name='', position=0):
  28         self.position = position
  29         self.x = x
  30         self.y = y
  31         self.radios = r
  32         self.name = name
  33
  34 class BallManager(list):
  35     def __init__(self, *args, **kwargs):
  36         super(BallManager, self).__init__(*args, **kwargs)
  37
  38     def save_to_file(self, path):
  39         target = open(path, 'w')
  40         for i in self:
  41             target.write('%d,%d %d %s\n' % (i.x, i.y, i.radios, i.name))
  42         target.close()
  43
  44 class GladeLoader(object):
  45     def __init__(self, fname, root=''):
  46         self.ui = gtk.glade.XML(fname, root)
  47         self.ui.signal_autoconnect(self)
  48
  49     def get_widget(self, wname):
  50         return self.ui.get_widget(wname)
  51
  52     # little shortcut
  53     wid = get_widget
  54
  55     # glade callbacks
  56
  57     def gtk_widget_show(self, widget, *args):
  58         widget.show()
  59         return True
  60
  61     def gtk_widget_hide(self, widget, *args):
  62         widget.hide()
  63         return True
  64
  65     def gtk_main_quit(self, *args):
  66         gtk.main_quit()
  67
  68     def gtk_main(self, *args):
  69         gtk.main()
  70
  71 class Project(object):
  72     def __init__(self, image, width, height):
  73         self.image = image
  74         self.width = width
  75         self.height = height
  76         self.focus_points_file = ''
  77
  78     def save_to_file(self, path):
  79         bn = os.path.basename(path)
  80         name = os.path.splitext(bn)[0]
  81
  82         cp = ConfigParser()
  83         cp.set('Project', 'image', self.image)
  84         cp.set('Project', 'width', self.width)
  85         cp.set('Project', 'height', self.height)
  86
  87         cp.write(open(path, 'w'))
  88
  89     @staticmethod
  90     def parse_file(path):
  91         cp = ConfigParser()
  92         cp.read(path)
  93
  94         image = cp.get('Project', 'image')
  95         width = cp.getint('Project', 'width')
  96         height = cp.getint('Project', 'height')
  97         x = cp.getint('Project', 'height')
  98
  99         proj = Project(image, width, height)
 100         proj.focus_points_file = cp.get('Project', 'focus_points')
 101
 102         return proj
 103
 104 class NewProject(GladeLoader):
 105     def __init__(self, parent=None):
 106         super(NewProject, self).__init__('gzv.glade', 'new-project')
 107         self.dialog = self.wid('new-project')
 108         if parent:
 109             self.dialog.set_transient_for(parent)
 110
 111     def get_project(self):
 112         fname = self.wid('image').get_filename()
 113         width = self.wid('width').get_text()
 114         height = self.wid('height').get_text()
 115         return Project(fname, width, height)
 116
 117     def destroy(self):
 118         self.dialog.destroy()
 119
 120 class Gzv(GladeLoader):
 121     def __init__(self):
 122         super(Gzv, self).__init__('gzv.glade', 'main-window')
 123         self.window = self.wid('main-window')
 124         self.window.connect('delete-event', lambda *x: gtk.main_quit())
 125
 126         self.evtbox = self.wid('eventbox')
 127         self.evtbox.connect('button-press-event', self.button_press)
 128         self.evtbox.connect('button-release-event', self.button_release)
 129         self.evtbox.connect('motion-notify-event', self.motion_notify)
 130
 131         self.model = gtk.ListStore(int, str)
 132         self.treeview = self.wid('treeview')
 133         self.treeview.set_model(self.model)
 134
 135         self.draw = self.wid('draw')
 136         self.draw.connect('expose-event', self.expose_draw)
 137
 138         # Starting with an empty project with no image loaded
 139         self.project = None
 140         self.image = None
 141
 142         # This attr may be overriten, if so, call the method (load_balls_to_treeview)
 143         self.balls = BallManager()
 144
 145         self.load_balls_to_treeview()
 146         self.setup_treeview()
 147
 148         # drawing stuff
 149         self.ball_width = Ball.DEFAULT_WIDTH
 150         self.selecting = False
 151         self.start_x = -1
 152         self.start_y = -1
 153
 154     def setup_treeview(self):
 155         self.model.connect('rows-reordered', self.on_rows_reordered)
 156
 157         renderer = gtk.CellRendererText()
 158         column = gtk.TreeViewColumn(_('Position'), renderer, text=0)
 159         column.set_property('visible', False)
 160         self.treeview.append_column(column)
 161
 162         renderer = gtk.CellRendererText()
 163         renderer.connect('edited', self.on_cell_edited)
 164         renderer.set_property('editable', True)
 165         column = gtk.TreeViewColumn(_('Name'), renderer, text=1)
 166         self.treeview.append_column(column)
 167
 168     def on_rows_reordered(self, *args):
 169         print
 170
 171     def on_cell_edited(self, *args):
 172         print args
 173
 174     def new_project(self, button):
 175         proj = NewProject(self.window)
 176
 177         # This '1' was defined in the glade file
 178         if proj.dialog.run() == 1:
 179             self.load_project(proj.get_project())
 180         proj.destroy()
 181
 182     def open_project(self, *args):
 183         fc = gtk.FileChooserDialog(_('Choose a gzv project'), self.window,
 184                                    buttons=(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
 185                                             gtk.STOCK_OK, gtk.RESPONSE_OK))
 186         if fc.run() == gtk.RESPONSE_OK:
 187             proj_file = fc.get_filename()
 188             self.load_project(Project.parse_file(proj_file))
 189         fc.destroy()
 190
 191     def load_project(self, project):
 192         self.balls = self.load_balls_from_file(project.focus_points_file)
 193         self.image = project.image
 194         self.load_balls_to_treeview()
 195         self.draw.queue_draw()
 196
 197     def load_balls_to_treeview(self):
 198         model = self.treeview.get_model()
 199         for i in self.balls:
 200             model.append([i.position, i.name])
 201
 202     def load_balls_from_file(self, fname):
 203         balls = BallManager()
 204         if not os.path.exists(fname):
 205             return balls
 206
 207         for index, line in enumerate(file(fname)):
 208             if not line:
 209                 continue
 210             pos, radios, name = line.split()
 211             x, y = pos.split(',')
 212             balls.append(Ball(int(x), int(y), int(radios), name, index))
 213         return balls
 214
 215     def expose_draw(self, draw, event):
 216         if not self.image:
 217             return
 218
 219         # loading the picture image and getting some useful
 220         # information to draw it in the widget's background
 221         img = gtk.gdk.pixbuf_new_from_file(self.image)
 222         pixels = img.get_pixels()
 223         rowstride = img.get_rowstride()
 224         width = img.get_width()
 225         height = img.get_height()
 226         gc = draw.style.black_gc
 227
 228         # sets the correct size of the eventbox, to show the scrollbar
 229         # when needed.
 230         self.evtbox.set_size_request(width, height)
 231
 232         # drawing the picture in the background of the drawing area,
 233         # this is really important.
 234         draw.window.draw_rgb_image(gc, 0, 0, width, height,
 235                                    'normal', pixels, rowstride,
 236                                    0, 0)
 237
 238         # this call makes the ball being drown be shown correctly.
 239         self.draw_current_ball()
 240
 241         # drawing other balls stored in the self.balls list.
 242         ctx = draw.window.cairo_create()
 243         ctx.fill()
 244
 245         ctx.set_line_width(10.0)
 246         ctx.set_source_rgba (0.5, 0.0, 0.0, 0.4)
 247
 248         for i in self.balls:
 249             ctx.arc(i.x, i.y, i.radios, 0, 64*math.pi)
 250
 251         ctx.fill()
 252         ctx.stroke()
 253
 254     def draw_current_ball(self):
 255         if self.start_x < 0:
 256             return
 257         ctx = self.draw.window.cairo_create()
 258         ctx.arc(self.start_x, self.start_y, self.ball_width, 0, 64*math.pi)
 259         ctx.set_source_rgba (0.5, 0.0, 0.0, 0.4)
 260         ctx.fill()
 261
 262     def button_press(self, widget, event):
 263         if event.button == 1:
 264             self.selecting = True
 265             self.start_x = event.x
 266             self.start_y = event.y
 267             self.last_x = event.x
 268
 269     def button_release(self, widget, event):
 270         if event.button == 1:
 271             self.selecting = False
 272             self.finish_drawing()
 273
 274     def motion_notify(self, widget, event):
 275         self.draw.queue_draw()
 276
 277         if event.x > self.last_x:
 278             self.ball_width += 2
 279         else:
 280             self.ball_width -= 2
 281
 282         self.last_x = event.x
 283
 284     def finish_drawing(self):
 285         self.draw_current_ball()
 286         self.ball_width = Ball.DEFAULT_WIDTH
 287
 288 if __name__ == '__main__':
 289     Gzv().window.show_all()
 290     gtk.main()