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.radius = 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.radius, 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         cp.set('Project', 'focus_points', self.focus_points_file)
  87
  88         cp.write(open(path, 'w'))
  89
  90     @staticmethod
  91     def parse_file(path):
  92         cp = ConfigParser()
  93         cp.read(path)
  94
  95         image = cp.get('Project', 'image')
  96         width = cp.getint('Project', 'width')
  97         height = cp.getint('Project', 'height')
  98         x = cp.getint('Project', 'height')
  99
 100         proj = Project(image, width, height)
 101         proj.focus_points_file = cp.get('Project', 'focus_points')
 102
 103         return proj
 104
 105 class NewProject(GladeLoader):
 106     def __init__(self, parent=None):
 107         super(NewProject, self).__init__('gzv.glade', 'new-project')
 108         self.dialog = self.wid('new-project')
 109         if parent:
 110             self.dialog.set_transient_for(parent)
 111
 112     def get_project(self):
 113         fname = self.wid('image').get_filename()
 114         width = self.wid('width').get_text()
 115         height = self.wid('height').get_text()
 116         return Project(fname, width, height)
 117
 118     def destroy(self):
 119         self.dialog.destroy()
 120
 121 class Gzv(GladeLoader):
 122     def __init__(self):
 123         super(Gzv, self).__init__('gzv.glade', 'main-window')
 124         self.window = self.wid('main-window')
 125         self.window.connect('delete-event', lambda *x: gtk.main_quit())
 126
 127         self.evtbox = self.wid('eventbox')
 128         self.evtbox.connect('button-press-event', self.button_press)
 129         self.evtbox.connect('button-release-event', self.button_release)
 130         self.evtbox.connect('motion-notify-event', self.motion_notify)
 131
 132         self.model = gtk.ListStore(int, str)
 133         self.treeview = self.wid('treeview')
 134         self.treeview.set_model(self.model)
 135
 136         self.draw = self.wid('draw')
 137         self.draw.connect('expose-event', self.expose_draw)
 138
 139         # Starting with an empty project with no image loaded
 140         self.project = None
 141         self.image = None
 142
 143         # This attr may be overriten, if so, call the method (load_balls_to_treeview)
 144         self.balls = BallManager()
 145
 146         self.load_balls_to_treeview()
 147         self.setup_treeview()
 148
 149         # drawing stuff
 150         self.selecting = False
 151         self.start_x = -1
 152         self.start_y = -1
 153         self.radius = Ball.DEFAULT_WIDTH
 154
 155     def setup_treeview(self):
 156         self.model.connect('rows-reordered', self.on_rows_reordered)
 157
 158         renderer = gtk.CellRendererText()
 159         column = gtk.TreeViewColumn(_('Position'), renderer, text=0)
 160         column.set_property('visible', False)
 161         self.treeview.append_column(column)
 162
 163         renderer = gtk.CellRendererText()
 164         renderer.connect('edited', self.on_cell_edited)
 165         renderer.set_property('editable', True)
 166         self.fpcolumn = gtk.TreeViewColumn(_('Name'), renderer, text=1)
 167         self.treeview.append_column(self.fpcolumn)
 168
 169     def on_rows_reordered(self, *args):
 170         print
 171
 172     def on_cell_edited(self, renderer, path, value):
 173         ball = Ball(self.start_x, self.start_y, self.radius, value, int(path))
 174         self.balls.append(ball)
 175         self.load_balls_to_treeview()
 176         self.draw.queue_draw()
 177
 178     def new_project(self, button):
 179         proj = NewProject(self.window)
 180
 181         # This '1' was defined in the glade file
 182         if proj.dialog.run() == 1:
 183             self.load_project(proj.get_project())
 184         proj.destroy()
 185
 186     def open_project(self, *args):
 187         fc = gtk.FileChooserDialog(_('Choose a gzv project'), self.window,
 188                                    buttons=(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
 189                                             gtk.STOCK_OK, gtk.RESPONSE_OK))
 190         if fc.run() == gtk.RESPONSE_OK:
 191             proj_file = fc.get_filename()
 192             self.load_project(Project.parse_file(proj_file))
 193         fc.destroy()
 194
 195     def load_project(self, project):
 196         self.project = project
 197         self.balls = self.load_balls_from_file(project.focus_points_file)
 198         self.image = project.image
 199         self.load_balls_to_treeview()
 200         self.draw.queue_draw()
 201
 202     def load_balls_to_treeview(self):
 203         model = self.treeview.get_model()
 204         for i in self.balls:
 205             model.append([i.position, i.name])
 206
 207     def load_balls_from_file(self, fname):
 208         balls = BallManager()
 209         if not os.path.exists(fname):
 210             return balls
 211
 212         for index, line in enumerate(file(fname)):
 213             if not line:
 214                 continue
 215             pos, radius, name = line.split()
 216             x, y = pos.split(',')
 217             balls.append(Ball(int(x), int(y), int(radius), name, index))
 218         return balls
 219
 220     def remove_fp(self, *args):
 221         selection = self.treeview.get_selection()
 222         model, path = selection.get_selected()
 223         if path:
 224             position = model[path][0]
 225             for i in self.balls:
 226                 if i.position == int(position):
 227                     self.balls.remove(i)
 228             del model[path]
 229             self.draw.queue_draw()
 230
 231     def save_fp_list(self, *args):
 232         assert self.project is not None
 233
 234         # if the project has no
 235         if self.project and not self.project.focus_points_file:
 236             fc = gtk.FileChooserDialog(_('Save the focus points file'),
 237                                        self.window,
 238                                        action=gtk.FILE_CHOOSER_ACTION_SAVE,
 239                                        buttons=(gtk.STOCK_CANCEL,
 240                                                 gtk.RESPONSE_CANCEL,
 241                                                 gtk.STOCK_SAVE,
 242                                                 gtk.RESPONSE_OK))
 243             if fc.run() == gtk.RESPONSE_OK:
 244                 self.project.focus_points_file = fc.get_filename()
 245                 fc.destroy()
 246             else:
 247                 fc.destroy()
 248                 return
 249
 250         self.balls.save_to_file(self.project.focus_points_file)
 251
 252     def expose_draw(self, draw, event):
 253         if not self.image:
 254             return
 255
 256         # loading the picture image and getting some useful
 257         # information to draw it in the widget's background
 258         img = gtk.gdk.pixbuf_new_from_file(self.image)
 259         pixels = img.get_pixels()
 260         rowstride = img.get_rowstride()
 261         width = img.get_width()
 262         height = img.get_height()
 263         gc = draw.style.black_gc
 264
 265         # sets the correct size of the eventbox, to show the scrollbar
 266         # when needed.
 267         self.evtbox.set_size_request(width, height)
 268
 269         # drawing the picture in the background of the drawing area,
 270         # this is really important.
 271         draw.window.draw_rgb_image(gc, 0, 0, width, height,
 272                                    'normal', pixels, rowstride,
 273                                    0, 0)
 274
 275         # this call makes the ball being drown be shown correctly.
 276         self.draw_current_ball()
 277
 278         # drawing other balls stored in the self.balls list.
 279         ctx = draw.window.cairo_create()
 280         ctx.fill()
 281
 282         ctx.set_line_width(10.0)
 283         ctx.set_source_rgba (0.5, 0.0, 0.0, 0.4)
 284
 285         for i in self.balls:
 286             ctx.arc(i.x, i.y, i.radius, 0, 64*math.pi)
 287
 288         ctx.fill()
 289         ctx.stroke()
 290
 291     def draw_current_ball(self):
 292         if self.start_x < 0:
 293             return
 294         ctx = self.draw.window.cairo_create()
 295         ctx.arc(self.start_x, self.start_y, self.radius, 0, 64*math.pi)
 296         ctx.set_source_rgba (0.5, 0.0, 0.0, 0.4)
 297         ctx.fill()
 298
 299     def button_press(self, widget, event):
 300         if event.button == 1:
 301             self.selecting = True
 302             self.start_x = event.x
 303             self.start_y = event.y
 304             self.last_x = event.x
 305
 306     def button_release(self, widget, event):
 307         if event.button == 1:
 308             self.selecting = False
 309             self.finish_drawing()
 310
 311     def motion_notify(self, widget, event):
 312         self.draw.queue_draw()
 313
 314         if event.x > self.last_x:
 315             self.radius += 3
 316         else:
 317             self.radius -= 3
 318
 319         self.last_x = event.x
 320
 321     def finish_drawing(self):
 322         self.draw_current_ball()
 323         self.ball_width = Ball.DEFAULT_WIDTH
 324
 325         position = len(self.balls)
 326         self.model.append([position, ''])
 327         self.treeview.set_cursor(str(position), self.fpcolumn, True)
 328
 329 if __name__ == '__main__':
 330     Gzv().window.show_all()
 331     gtk.main()