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Diffstat (limited to 'examples/pygtk-demo/demos/pixbufs.py')
| -rw-r--r-- | examples/pygtk-demo/demos/pixbufs.py | 200 |
1 files changed, 0 insertions, 200 deletions
diff --git a/examples/pygtk-demo/demos/pixbufs.py b/examples/pygtk-demo/demos/pixbufs.py deleted file mode 100644 index c29d1dd8..00000000 --- a/examples/pygtk-demo/demos/pixbufs.py +++ /dev/null @@ -1,200 +0,0 @@ -#!/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 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 = gtk.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: - gtk.timeout_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() |