diff options
Diffstat (limited to 'ImageView.py')
| -rw-r--r-- | ImageView.py | 34 |
1 files changed, 31 insertions, 3 deletions
diff --git a/ImageView.py b/ImageView.py index e74f3e9..7bc9095 100644 --- a/ImageView.py +++ b/ImageView.py @@ -15,6 +15,7 @@ # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +import logging import cairo from gi.repository import Gtk @@ -47,6 +48,9 @@ class ImageViewer(Gtk.DrawingArea): self._surface = None self._zoom = None + self._in_zoomtouch = False + self._zoomtouch_scale = 1 + self.connect('draw', self.__draw_cb) def set_file_location(self, file_location): @@ -102,6 +106,27 @@ class ImageViewer(Gtk.DrawingArea): self._zoom = 1 self.queue_draw() + def start_zoomtouch(self, center): + logging.debug("start_zoomtouch %r", center) + self._in_zoomtouch = True + self._zoomtouch_scale = 1 + self.queue_draw() + + def update_zoomtouch(self, center, scale): + logging.debug("update_zoomtouch %r", (center, scale)) + self._zoomtouch_scale = scale + self.queue_draw() + + def finish_zoomtouch(self): + logging.debug("finish_zoomtouch") + + # apply zoom + self._zoom = self._zoom * self._zoomtouch_scale + + self._in_zoomtouch = False + self._zoomtouch_scale = 1 + self.queue_draw() + def __draw_cb(self, widget, ctx): # If the image surface is not set, it reads it from the file @@ -120,15 +145,18 @@ class ImageViewer(Gtk.DrawingArea): # Scale and center the image according to the current zoom. - scaled_width = int(self._surface.get_width() * self._zoom) - scaled_height = int(self._surface.get_height() * self._zoom) + zoom_absolute = self._zoom * self._zoomtouch_scale + + scaled_width = int(self._surface.get_width() * zoom_absolute) + scaled_height = int(self._surface.get_height() * zoom_absolute) + alloc = self.get_allocation() x_offset = (alloc.width * 1.0 - scaled_width) / 2 y_offset = (alloc.height * 1.0 - scaled_height) / 2 ctx.translate(x_offset, y_offset) - ctx.scale(self._zoom, self._zoom) + ctx.scale(zoom_absolute, zoom_absolute) ctx.set_source_surface(self._surface, 0, 0) # FIXME investigate |