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 gtk
  16 import gtk.glade
  17 import math
  18 import cairo
  19
  20 _ = lambda x:x
  21
  22 class Ball(object):
  23     DEFAULT_WIDTH = 10
  24
  25     def __init__(self, x, y, r, name='', position=0):
  26         self.position = position
  27         self.x = x
  28         self.y = y
  29         self.radios = r
  30         self.name = name
  31
  32 class BallManager(list):
  33     def __init__(self, *args, **kwargs):
  34         super(BallManager, self).__init__(*args, **kwargs)
  35
  36     def save_to_file(self, path):
  37         target = open(path, 'w')
  38         for i in self:
  39             target.write('%d,%d %d %s\n' % (i.x, i.y, i.radios, i.name))
  40         target.close()
  41
  42 class GladeLoader(object):
  43     def __init__(self, fname, root=''):
  44         self.ui = gtk.glade.XML(fname, root)
  45         self.ui.signal_autoconnect(self)
  46
  47     def get_widget(self, wname):
  48         return self.ui.get_widget(wname)
  49
  50     # little shortcut
  51     wid = get_widget
  52
  53     # glade callbacks
  54
  55     def gtk_widget_show(self, widget, *args):
  56         widget.show()
  57         return True
  58
  59     def gtk_widget_hide(self, widget, *args):
  60         widget.hide()
  61         return True
  62
  63     def gtk_main_quit(self, *args):
  64         gtk.main_quit()
  65
  66     def gtk_main(self, *args):
  67         gtk.main()
  68
  69 class NewProject(GladeLoader):
  70     def __init__(self, parent=None):
  71         super(NewProject, self).__init__('gzv.glade', 'new-project')
  72         if parent:
  73             self.wid('new-project').set_transient_for(parent)
  74
  75 class Gzv(GladeLoader):
  76     def __init__(self):
  77         super(Gzv, self).__init__('gzv.glade', 'main-window')
  78         self.window = self.wid('main-window')
  79         self.window.connect('delete-event', lambda *x: gtk.main_quit())
  80
  81         self.evtbox = self.wid('eventbox')
  82         self.evtbox.connect('button-press-event', self.button_press)
  83         self.evtbox.connect('button-release-event', self.button_release)
  84         self.evtbox.connect('motion-notify-event', self.motion_notify)
  85
  86         self.model = gtk.ListStore(int, str)
  87         self.treeview = self.wid('treeview')
  88         self.treeview.set_model(self.model)
  89
  90         self.draw = self.wid('draw')
  91         self.draw.connect('expose-event', self.expose_draw)
  92
  93         # FIXME: Hardcoded.
  94         self.image = 'skol.jpg'
  95         self.balls = self.load_balls_from_file('xxx')
  96         self.load_balls_to_treeview()
  97
  98         # this *MUST* be called *AFTER* load_balls_to_treeview
  99         self.setup_treeview()
 100
 101         self.ball_width = Ball.DEFAULT_WIDTH
 102         self.selecting = False
 103         self.start_x = -1
 104         self.start_y = -1
 105
 106     def setup_treeview(self):
 107         self.model.connect('rows-reordered', self.on_rows_reordered)
 108
 109         renderer = gtk.CellRendererText()
 110         column = gtk.TreeViewColumn(_('Position'), renderer, text=0)
 111         self.treeview.append_column(column)
 112
 113         renderer = gtk.CellRendererText()
 114         renderer.connect('edited', self.on_cell_edited)
 115         renderer.set_property('editable', True)
 116         column = gtk.TreeViewColumn(_('Name'), renderer, text=1)
 117         self.treeview.append_column(column)
 118
 119     def on_rows_reordered(self, *args):
 120         print
 121
 122     def on_cell_edited(self, *args):
 123         print args
 124
 125     def new_project(self, button):
 126         dialog = NewProject(self.window).wid('new-project')
 127
 128         # This '1' was defined in the glade file
 129         if dialog.run() == 1:
 130             pass
 131         dialog.destroy()
 132
 133     def open_file_chooser(self, button):
 134         fc = gtk.FileChooserDialog(_('Choose an image'), self,
 135                                    buttons=(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
 136                                             gtk.STOCK_OK, gtk.RESPONSE_OK))
 137         if fc.run() == gtk.RESPONSE_OK:
 138             self.image = fc.get_filename()
 139
 140         fc.destroy()
 141
 142     def load_balls_to_treeview(self):
 143         model = self.treeview.get_model()
 144         for i in self.balls:
 145             model.append([i.position, i.name])
 146
 147     def load_balls_from_file(self, fname):
 148         balls = BallManager()
 149         for index, line in enumerate(file(fname)):
 150             if not line:
 151                 continue
 152             pos, radios, name = line.split()
 153             x, y = pos.split(',')
 154             balls.append(Ball(int(x), int(y), int(radios), name, index))
 155         return balls
 156
 157     def expose_draw(self, draw, event):
 158         if not self.image:
 159             return
 160
 161         # loading the picture image and getting some useful
 162         # information to draw it in the widget's background
 163         img = gtk.gdk.pixbuf_new_from_file(self.image)
 164         pixels = img.get_pixels()
 165         rowstride = img.get_rowstride()
 166         width = img.get_width()
 167         height = img.get_height()
 168         gc = draw.style.black_gc
 169
 170         # sets the correct size of the eventbox, to show the scrollbar
 171         # when needed.
 172         self.evtbox.set_size_request(width, height)
 173
 174         # drawing the picture in the background of the drawing area,
 175         # this is really important.
 176         draw.window.draw_rgb_image(gc, 0, 0, width, height,
 177                                    'normal', pixels, rowstride,
 178                                    0, 0)
 179
 180         # this call makes the ball being drown be shown correctly.
 181         self.draw_current_ball()
 182
 183         # drawing other balls stored in the self.balls list.
 184         ctx = draw.window.cairo_create()
 185         ctx.fill()
 186
 187         ctx.set_line_width(10.0)
 188         ctx.set_source_rgba (0.5, 0.0, 0.0, 0.4)
 189
 190         for i in self.balls:
 191             ctx.arc(i.x, i.y, i.radios, 0, 64*math.pi)
 192
 193         ctx.fill()
 194         ctx.stroke()
 195
 196     def draw_current_ball(self):
 197         if self.start_x < 0:
 198             return
 199         ctx = self.draw.window.cairo_create()
 200         ctx.arc(self.start_x, self.start_y, self.ball_width, 0, 64*math.pi)
 201         ctx.set_source_rgba (0.5, 0.0, 0.0, 0.4)
 202         ctx.fill()
 203
 204     def button_press(self, widget, event):
 205         if event.button == 1:
 206             self.selecting = True
 207             self.start_x = event.x
 208             self.start_y = event.y
 209             self.last_x = event.x
 210
 211     def button_release(self, widget, event):
 212         if event.button == 1:
 213             self.selecting = False
 214             self.finish_drawing()
 215
 216     def motion_notify(self, widget, event):
 217         self.draw.queue_draw()
 218
 219         if event.x > self.last_x:
 220             self.ball_width += 2
 221         else:
 222             self.ball_width -= 2
 223
 224         self.last_x = event.x
 225
 226     def finish_drawing(self):
 227         self.draw_current_ball()
 228         self.ball_width = Ball.DEFAULT_WIDTH
 229
 230 if __name__ == '__main__':
 231     Gzv().window.show_all()
 232     gtk.main()