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/* Copyright 2013 Jens Bav
* Copyright 2016 Software Freedom Conservancy Inc.
*
* This software is licensed under the GNU Lesser General Public License
* (version 2.1 or later). See the COPYING file in this distribution.
*/
using Spit;
private class ClockEffectDescriptor : ShotwellTransitionDescriptor {
public ClockEffectDescriptor(GLib.File resource_directory) {
base(resource_directory);
}
public override unowned string get_id() {
return "org.yorba.shotwell.transitions.clock";
}
public override unowned string get_pluggable_name() {
return _("Clock");
}
public override Transitions.Effect create(HostInterface host) {
return new ClockEffect();
}
}
private class ClockEffect : Object, Transitions.Effect {
private const int DESIRED_FPS = 25;
private const int MIN_FPS = 15;
private const double TOP_RADIANT = 0.5 * Math.PI;
public ClockEffect() {
}
public void get_fps(out int desired_fps, out int min_fps) {
desired_fps = ClockEffect.DESIRED_FPS;
min_fps = ClockEffect.MIN_FPS;
}
public void start(Transitions.Visuals visuals, Transitions.Motion motion) {
}
public bool needs_clear_background() {
return true;
}
public void paint(Transitions.Visuals visuals, Transitions.Motion motion, Cairo.Context ctx,
int width, int height, int frame_number) {
double alpha = motion.get_alpha(frame_number);
double start_angle = -TOP_RADIANT, stop_angle = -TOP_RADIANT;
if (motion.direction == Transitions.Direction.FORWARD)
stop_angle = alpha*Math.PI * 2 - TOP_RADIANT;
else
start_angle = (2 * (1-alpha)) * Math.PI - TOP_RADIANT;
int radius = (int) Math.fmax(visuals.to_pos.width, visuals.to_pos.height);
if (visuals.from_pixbuf != null) {
Gdk.cairo_set_source_pixbuf(ctx, visuals.from_pixbuf, visuals.from_pos.x,
visuals.from_pos.y);
ctx.paint_with_alpha(1 - alpha);
}
if (visuals.to_pixbuf != null) {
Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf,visuals.to_pos.x, visuals.to_pos.y);
int x = visuals.to_pos.x + (int) visuals.to_pos.width / 2;
int y = visuals.to_pos.y + (int) visuals.to_pos.height / 2;
ctx.move_to(x, y);
ctx.arc (x, y, radius, start_angle, stop_angle);
ctx.fill_preserve();
}
}
public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
}
public void cancel() {
}
}
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