/usr/share/pygtk/2.0/demos/pixbufs.py is in python-gtk2-doc 2.24.0-5.1ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | #!/usr/bin/env python
'''Pixbufs
A GdkPixbuf represents an image, normally in RGB or RGBA format.
Pixbufs are normally used to load files from disk and perform image scaling.
This demo is not all that educational, but looks cool. It was written by
Extreme Pixbuf Hacker Federico Mena Quintero. It also shows off how to use
GtkDrawingArea to do a simple animation.
Look at the Image demo for additional pixbuf usage examples.'''
# pygtk version: Maik Hertha <maik.hertha@berlin.de>
import os
import math
import pygtk
pygtk.require('2.0')
import gobject
import gtk
FRAME_DELAY = 50
CYCLE_LEN = 60
IMAGE_DIR = os.path.join(os.path.dirname(__file__), 'images')
BACKGROUND_NAME = "background.jpg"
image_names = [
"apple-red.png",
"gnome-applets.png",
"gnome-calendar.png",
"gnome-foot.png",
"gnome-gmush.png",
"gnome-gimp.png",
"gnome-gsame.png",
"gnu-keys.png"
]
class PixbufsDemo(gtk.Window):
frame = None # frame of the background image
background = None # background-pixbuf
images = [] # list of pixbufs
back_width = 0 # width of background image
back_height = 0 # height of background image
timeout_id = 0 # timeout id
frame_num = 0 # number of the current frame
timeout_id = None
def __init__(self, parent=None):
gtk.Window.__init__(self)
try:
self.set_screen(parent.get_screen())
except AttributeError:
self.connect("destroy", lambda *w: gtk.main_quit())
self.connect("destroy", self.cleanup_callback)
self.set_title(self.__class__.__name__)
self.set_resizable(False)
if not self.load_pixbufs():
dialog = gtk.MessageDialog(self,
gtk.DIALOG_DESTROY_WITH_PARENT,
gtk.MESSAGE_ERROR,
gtk.BUTTONS_CLOSE,
"Failed to load an image")
dialog.connect("response", lambda d, r: d.destroy())
dialog.show()
else:
self.set_size_request(self.back_width, self.back_height)
self.frame = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, False, 8,
self.back_width, self.back_height)
da = gtk.DrawingArea()
da.connect("expose_event", self.expose_cb)
self.add(da)
self.timeout_id = gobject.timeout_add(FRAME_DELAY, self.timeout)
self.show_all()
def load_pixbufs(self):
''' Loads the images for the demo and returns whether the
operation succeeded.
'''
if self.background is not None:
return True # already loaded earlier
# look in the the current directory where the file is installed
try:
self.background = gtk.gdk.pixbuf_new_from_file(
os.path.join(IMAGE_DIR, BACKGROUND_NAME))
except gobject.GError, error:
return False
self.back_width = self.background.get_width()
self.back_height = self.background.get_height()
for filename in image_names:
try:
self.images.append(gtk.gdk.pixbuf_new_from_file(
os.path.join(IMAGE_DIR, filename)))
except gobject.GError, error:
return False
return True
def expose_cb(self, draw_area, event):
''' Expose callback for the drawing area. '''
rowstride = self.frame.get_rowstride()
# FIXME: what should be the result, string guchar an integer result?
#pixels = frame.get_pixels() + rowstride * event.area.y + event.area.x * 3
#pixels = frame.get_pixels()[len(frame.get_pixels()) + rowstride * event.area.y + event.area.x * 3]
pixels = self.frame.get_pixels()
draw_area.window.draw_rgb_image(
draw_area.style.black_gc,
event.area.x, event.area.y,
event.area.width, event.area.height,
'normal',
pixels, rowstride,
event.area.x, event.area.y)
return True
def cleanup_callback(self, win):
if self.timeout_id is not None:
gobject.source_remove(self.timeout_id)
self.timeout_id = None
def timeout(self):
''' Timeout handler to regenerate the frame. '''
self.background.copy_area(0, 0, self.back_width, self.back_height,
self.frame, 0, 0)
f = float(self.frame_num % CYCLE_LEN) / float(CYCLE_LEN)
xmid = self.back_width / 2.0
ymid = self.back_height / 2.0
radius = min(xmid, ymid) / 2.0
N_IMAGES = len(image_names)
for i_name in image_names:
i = image_names.index(i_name)
ang = 2.0 * math.pi * i / N_IMAGES - f * 2.0 * math.pi
iw = self.images[i].get_width()
ih = self.images[i].get_height()
r = radius +(radius / 3.0) * math.sin(f * 2.0 * math.pi)
xpos = math.floor(xmid + r * math.cos(ang) - iw / 2.0 + 0.5)
ypos = math.floor(ymid + r * math.sin(ang) - ih / 2.0 + 0.5)
if i % 2 == 0:
k = math.cos(f * 2.0 * math.pi)
else:
k = math.sin(f * 2.0 * math.pi)
k = 2.0 * k * k
k = max(0.25, k)
# satisfy the c-source
r1 = gtk.gdk.Rectangle()
r1.x = int(xpos)
r1.y = int(ypos)
r1.width = iw * k
r1.height = ih * k
r2 = gtk.gdk.Rectangle()
r2.x = 0
r2.y = 0
r2.width = self.back_width
r2.height = self.back_height
dest = r1.intersect(r2)
if dest is not None:
if i % 2 == 0:
alpha = int(
max(127, math.fabs(255 * math.cos(f * 2.0 * math.pi))))
else:
alpha = int(
max(127, math.fabs(255 * math.sin(f * 2.0 * math.pi))))
self.images[i].composite(
self.frame,
dest.x, dest.y,
dest.width, dest.height,
xpos, ypos,
k, k,
gtk.gdk.INTERP_NEAREST,
alpha)
if self is not None:
self.queue_draw()
self.frame_num += 1
return True
def main():
PixbufsDemo()
gtk.main()
if __name__ == '__main__':
main()
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