gzv.py

   1 # -*- coding: utf-8; -*-
   2 # gzv.py - an user interface to generate-zooming-video
   3 #
   4 # Copyright (C) 2008  Lincoln de Sousa <lincoln@minaslivre.org>
   5 #
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 import os
  17 import gtk
  18 import gtk.glade
  19 import gobject
  20 import math
  21 import cairo
  22 from ConfigParser import ConfigParser
  23
  24 _ = lambda x:x
  25
  26 class Point(object):
  27     def __init__(self, x, y):
  28         self.x = x
  29         self.y = y
  30
  31     @staticmethod
  32     def pythagorean(p1, p2):
  33         return math.sqrt((p2.x - p1.x)**2 + (p2.y - p1.y)**2)
  34
  35 class Ball(object):
  36     DEFAULT_WIDTH = 10
  37
  38     def __init__(self, x, y, r, name='', position=0, selected=False):
  39         self.position = position
  40         self.selected = selected
  41         self.p = Point(int(x), int(y))
  42         self.radius = int(r)
  43         self.name = name
  44
  45 class BallManager(list):
  46     def __init__(self, *args, **kwargs):
  47         super(BallManager, self).__init__(*args, **kwargs)
  48
  49     def save_to_file(self, path):
  50         target = open(path, 'w')
  51         for i in self:
  52             target.write('%d,%d %d %s\n' % (i.p.x, i.p.y, i.radius, i.name))
  53         target.close()
  54
  55 class GladeLoader(object):
  56     def __init__(self, fname, root=''):
  57         self.ui = gtk.glade.XML(fname, root)
  58         self.ui.signal_autoconnect(self)
  59
  60     def get_widget(self, wname):
  61         return self.ui.get_widget(wname)
  62
  63     # little shortcut
  64     wid = get_widget
  65
  66     # glade callbacks
  67
  68     def gtk_widget_show(self, widget, *args):
  69         widget.show()
  70         return True
  71
  72     def gtk_widget_hide(self, widget, *args):
  73         widget.hide()
  74         return True
  75
  76     def gtk_main_quit(self, *args):
  77         gtk.main_quit()
  78
  79     def gtk_main(self, *args):
  80         gtk.main()
  81
  82 class Project(object):
  83     def __init__(self, image, width, height):
  84         self.image = image
  85         self.width = width
  86         self.height = height
  87         self.focus_points_file = ''
  88
  89     def save_to_file(self, path):
  90         if not self.focus_points_file:
  91             bn = os.path.basename(path)
  92             name = os.path.splitext(bn)[0]
  93             self.focus_points_file = \
  94                 os.path.join(os.path.dirname(path), name + '_fpf')
  95
  96         cp = ConfigParser()
  97         cp.add_section('Project')
  98         cp.set('Project', 'image', self.image)
  99         cp.set('Project', 'width', self.width)
 100         cp.set('Project', 'height', self.height)
 101         cp.set('Project', 'focus_points', self.focus_points_file)
 102
 103         cp.write(open(path, 'w'))
 104
 105     @staticmethod
 106     def parse_file(path):
 107         cp = ConfigParser()
 108         cp.read(path)
 109
 110         image = cp.get('Project', 'image')
 111         width = cp.getint('Project', 'width')
 112         height = cp.getint('Project', 'height')
 113         x = cp.getint('Project', 'height')
 114
 115         proj = Project(image, width, height)
 116         proj.focus_points_file = cp.get('Project', 'focus_points')
 117
 118         return proj
 119
 120 class NewProject(GladeLoader):
 121     def __init__(self, parent=None):
 122         super(NewProject, self).__init__('gzv.glade', 'new-project')
 123         self.dialog = self.wid('new-project')
 124         if parent:
 125             self.dialog.set_transient_for(parent)
 126
 127     def get_project(self):
 128         # This '1' was defined in the glade file
 129         if not self.dialog.run() == 1:
 130             return None
 131
 132         fname = self.wid('image').get_filename()
 133         width = self.wid('width').get_text()
 134         height = self.wid('height').get_text()
 135         return Project(fname, width, height)
 136
 137     def destroy(self):
 138         self.dialog.destroy()
 139
 140 class Gzv(GladeLoader):
 141     def __init__(self):
 142         super(Gzv, self).__init__('gzv.glade', 'main-window')
 143         self.window = self.wid('main-window')
 144         self.window.connect('delete-event', lambda *x: gtk.main_quit())
 145
 146         self.evtbox = self.wid('eventbox')
 147         self.evtbox.connect('button-press-event', self.button_press)
 148         self.evtbox.connect('button-release-event', self.button_release)
 149         self.evtbox.connect('motion-notify-event', self.motion_notify)
 150         self.evtbox.connect('motion-notify-event', self.ball_motion)
 151
 152         # making it possible to grab motion events when the mouse is
 153         # over the widget.
 154         self.evtbox.set_events(gtk.gdk.POINTER_MOTION_MASK)
 155
 156         self.model = gtk.ListStore(int, str)
 157         self.treeview = self.wid('treeview')
 158         self.treeview.set_model(self.model)
 159         self.treeview.connect('button-press-event', self.select_fp)
 160
 161         self.draw = self.wid('draw')
 162         self.draw.connect_after('expose-event', self.expose_draw)
 163
 164         # Starting with an empty project with no image loaded
 165         self.project = None
 166         self.image = None
 167
 168         # This attr may be overriten, if so, call the method (load_balls_to_treeview)
 169         self.balls = BallManager()
 170
 171         self.load_balls_to_treeview()
 172         self.setup_treeview()
 173
 174         self.new_ball = False
 175         self.move_ball = None
 176
 177         # drawing stuff
 178         self.start_x = -1
 179         self.start_y = -1
 180         self.last_x = -1
 181         self.last_y = -1
 182         self.radius = Ball.DEFAULT_WIDTH
 183
 184     def show(self):
 185         self.window.show_all()
 186
 187     def setup_treeview(self):
 188         self.model.connect('rows-reordered', self.on_rows_reordered)
 189
 190         renderer = gtk.CellRendererText()
 191         column = gtk.TreeViewColumn(_('Position'), renderer, text=0)
 192         column.set_property('visible', False)
 193         self.treeview.append_column(column)
 194
 195         renderer = gtk.CellRendererText()
 196         renderer.connect('edited', self.on_cell_edited)
 197         renderer.set_property('editable', True)
 198         self.fpcolumn = gtk.TreeViewColumn(_('Name'), renderer, text=1)
 199         self.treeview.append_column(self.fpcolumn)
 200
 201     def on_rows_reordered(self, *args):
 202         print
 203
 204     def on_cell_edited(self, renderer, path, value):
 205         self.balls[int(path)].name = value
 206         self.load_balls_to_treeview()
 207
 208     def new_project(self, button):
 209         proj = NewProject(self.window)
 210         project = proj.get_project()
 211         proj.destroy()
 212
 213         if project:
 214             self.load_project(project)
 215
 216     def open_project(self, *args):
 217         fc = gtk.FileChooserDialog(_('Choose a gzv project'), self.window,
 218                                    buttons=(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
 219                                             gtk.STOCK_OK, gtk.RESPONSE_OK))
 220         if fc.run() == gtk.RESPONSE_OK:
 221             proj_file = fc.get_filename()
 222             self.load_project(Project.parse_file(proj_file))
 223         fc.destroy()
 224
 225     def save_project(self, *args):
 226         fc = gtk.FileChooserDialog(_('Save project'), self.window,
 227                                    action=gtk.FILE_CHOOSER_ACTION_SAVE,
 228                                    buttons=(gtk.STOCK_CANCEL,
 229                                             gtk.RESPONSE_CANCEL,
 230                                             gtk.STOCK_SAVE,
 231                                             gtk.RESPONSE_OK))
 232         if fc.run() == gtk.RESPONSE_OK:
 233             self.project.save_to_file(fc.get_filename())
 234             self.balls.save_to_file(self.project.focus_points_file)
 235         fc.destroy()
 236
 237     def load_project(self, project):
 238         self.project = project
 239         self.balls = self.load_balls_from_file(project.focus_points_file)
 240         self.image = project.image
 241
 242         # I'm loading a pixbuf first because I need to get its
 243         # dimensions this with a pixbuf is easier than with an image.
 244         try:
 245             pixbuf = gtk.gdk.pixbuf_new_from_file(project.image)
 246         except gobject.GError:
 247             msg = _("Couldn't recognize the image file format.")
 248             dialog = gtk.MessageDialog(self.window,
 249                                        gtk.DIALOG_MODAL,
 250                                        gtk.MESSAGE_ERROR,
 251                                        gtk.BUTTONS_CLOSE)
 252             dialog.set_markup(msg)
 253             dialog.run()
 254             dialog.destroy()
 255             return self.unload_project()
 256
 257         self.draw.set_from_pixbuf(pixbuf)
 258         self.load_balls_to_treeview()
 259         self.set_widgets_sensitivity(True)
 260
 261     def unload_project(self):
 262         self.project = None
 263         self.image = None
 264         self.balls = BallManager()
 265         self.draw.queue_draw()
 266         self.set_widgets_sensitivity(False)
 267
 268     def set_widgets_sensitivity(self, sensitive):
 269         for i in 'toolbutton1', 'toolbutton5', 'scrolledwindow1', 'hbox2':
 270             self.wid(i).set_sensitive(sensitive)
 271
 272     def load_balls_to_treeview(self):
 273         self.model.clear()
 274         for i in self.balls:
 275             self.model.append([i.position, i.name])
 276
 277     def load_balls_from_file(self, fname):
 278         balls = BallManager()
 279         if not os.path.exists(fname):
 280             return balls
 281
 282         for index, line in enumerate(file(fname)):
 283             if not line:
 284                 continue
 285             pos, radius, name = line.split(None, 2)
 286             x, y = pos.split(',')
 287             balls.append(Ball(x, y, radius, name.strip(), index))
 288         return balls
 289
 290     def remove_fp(self, *args):
 291         selection = self.treeview.get_selection()
 292         model, path = selection.get_selected()
 293         if path:
 294             position = model[path][0]
 295             for i in self.balls:
 296                 if i.position == int(position):
 297                     self.balls.remove(i)
 298             del model[path]
 299             self.draw.queue_draw()
 300
 301     def select_fp(self, treeview, event):
 302         path, column, x, y = \
 303             self.treeview.get_path_at_pos(int(event.x), int(event.y))
 304         if path:
 305             model = self.treeview.get_model()
 306             ball = self.balls[model[path][0]]
 307
 308             # making sure that only one ball is selected
 309             for i in self.balls:
 310                 i.selected = False
 311             ball.selected = True
 312
 313             # available space to the image
 314             w = self.evtbox.get_allocation().width
 315             h = self.evtbox.get_allocation().height
 316
 317             # point begining from the left image border
 318             wib = self.point_with_border(ball)
 319
 320             print wib.x, w
 321
 322             self.wid('viewport').get_vadjustment().value = wib.x # + (w / 2)
 323             self.wid('viewport').get_hadjustment().value = wib.y # + (h / 2)
 324
 325             self.draw.queue_draw()
 326
 327     def select_fp_from_image(self, ball):
 328         selection = self.treeview.get_selection()
 329         selection.select_path(str(ball.position))
 330
 331         # making sure that only one ball is selected
 332         for i in self.balls:
 333             i.selected = False
 334         ball.selected = True
 335
 336         self.draw.queue_draw()
 337
 338     def save_fp_list(self, *args):
 339         assert self.project is not None
 340
 341         # if the project has no
 342         if self.project and not self.project.focus_points_file:
 343             fc = gtk.FileChooserDialog(_('Save the focus points file'),
 344                                        self.window,
 345                                        action=gtk.FILE_CHOOSER_ACTION_SAVE,
 346                                        buttons=(gtk.STOCK_CANCEL,
 347                                                 gtk.RESPONSE_CANCEL,
 348                                                 gtk.STOCK_SAVE,
 349                                                 gtk.RESPONSE_OK))
 350             if fc.run() == gtk.RESPONSE_OK:
 351                 self.project.focus_points_file = fc.get_filename()
 352                 fc.destroy()
 353             else:
 354                 fc.destroy()
 355                 return
 356
 357         self.balls.save_to_file(self.project.focus_points_file)
 358
 359     def expose_draw(self, draw, event):
 360         if not self.image:
 361             return
 362
 363         for i in self.balls:
 364             self.draw_ball(i)
 365
 366         if self.start_x < 0:
 367             return False
 368
 369         if self.new_ball:
 370             ball = Ball(self.start_x, self.start_y, self.radius)
 371             self.draw_ball(ball)
 372
 373         return False
 374
 375     def point_with_border(self, ball):
 376         iw, ih = self.draw.size_request()
 377         w = self.draw.get_allocation().width
 378         h = self.draw.get_allocation().height
 379
 380         x = ((w / 2) - (iw / 2)) + ball.p.x
 381         y = ((h / 2) - (ih / 2)) + ball.p.y
 382         return Point(x, y)
 383
 384     def point_without_border(self, point):
 385         iw, ih = self.draw.size_request()
 386         w = self.draw.get_allocation().width
 387         h = self.draw.get_allocation().height
 388
 389         x = point.x - ((w / 2) - (iw / 2))
 390         y = point.y - ((h / 2) - (ih / 2))
 391         return Point(x, y)
 392
 393     def draw_ball(self, ball):
 394         ctx = self.draw.window.cairo_create()
 395         ctx.arc(self.point_with_border(ball).x,
 396                 self.point_with_border(ball).y,
 397                 ball.radius, 0, 64*math.pi)
 398         ctx.set_source_rgba(0.0, 0.0, 0.5, 0.4)
 399         ctx.fill()
 400
 401         if ball.selected:
 402             ctx.set_source_rgba(0.0, 0.5, 0.0, 0.4)
 403             ctx.set_line_width(5)
 404             ctx.arc(self.point_with_border(ball).x,
 405                     self.point_with_border(ball).y,
 406                     ball.radius+1, 0, 64*math.pi)
 407             ctx.stroke()
 408
 409     def button_press(self, widget, event):
 410         self.new_ball = True
 411
 412         self.last_x = event.x
 413         self.last_y = event.y
 414
 415         if event.button == 1:
 416             for i in self.balls:
 417                 p1 = Point(event.x, event.y)
 418                 p2 = self.point_with_border(i)
 419                 if Point.pythagorean(p1, p2) < i.radius:
 420                     self.last_x = event.x - i.p.x
 421                     self.last_y = event.y - i.p.y
 422                     self.select_fp_from_image(i)
 423
 424                     self.new_ball = False
 425                     self.move_ball = i
 426                     break
 427
 428             self.start_x = self.point_without_border(event).x
 429             self.start_y = self.point_without_border(event).y
 430
 431     def button_release(self, widget, event):
 432         self.move_ball = None
 433
 434         if event.button == 1:
 435             self.finish_drawing()
 436
 437     def motion_notify(self, widget, event):
 438         if not self.new_ball:
 439             return
 440
 441         self.draw.queue_draw()
 442
 443         if event.x > self.last_x:
 444             self.radius += 3
 445         else:
 446             self.radius -= 3
 447
 448         self.last_x = event.x
 449
 450     def ball_motion(self, widget, event):
 451         if not self.move_ball:
 452             return
 453
 454         self.move_ball.p.x = self.point_without_border(event).x
 455         self.move_ball.p.y = self.point_without_border(event).y
 456
 457         self.draw.queue_draw()
 458
 459     def finish_drawing(self):
 460         if self.new_ball:
 461             position = len(self.balls)
 462             ball = Ball(self.start_x, self.start_y, self.radius, '', position)
 463             self.balls.append(ball)
 464             self.model.append([position, ''])
 465             self.treeview.set_cursor(str(position), self.fpcolumn, True)
 466             self.new_ball = False
 467
 468         # reseting to the default coordenades
 469         self.start_x = -1
 470         self.start_y = -1
 471         self.radius = Ball.DEFAULT_WIDTH
 472
 473 if __name__ == '__main__':
 474     Gzv().show()
 475     gtk.main()