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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 CirclesEffectDescriptor : ShotwellTransitionDescriptor {
public CirclesEffectDescriptor(GLib.File resource_directory) {
base(resource_directory);
}
public override unowned string get_id() {
return "org.yorba.shotwell.transitions.circles";
}
public override unowned string get_pluggable_name() {
return _("Circles");
}
public override Transitions.Effect create(HostInterface host) {
return new CirclesEffect();
}
}
private class CirclesEffect : Object, Transitions.Effect {
private const int DESIRED_FPS = 25;
private const int MIN_FPS = 15;
private const double SPEED = 2.5;
public CirclesEffect() {
}
public void get_fps(out int desired_fps, out int min_fps) {
desired_fps = CirclesEffect.DESIRED_FPS;
min_fps = CirclesEffect.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);
int distance = 60, radius;
int circleCountX = width / (2 * distance);
int circleCountY = height / distance;
double maxRadius = SPEED * distance;
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);
for(int y = 0; y <= circleCountY; y++){
for(int x = 0; x <= circleCountX; x++){
radius = (int) (Math.fmax(0,Math.fmin(1, alpha-((double) (x + y)/(double)
((circleCountY + circleCountX) * SPEED)))) * maxRadius);
ctx.arc(2 * distance * x, 2 * distance * y, radius, 0, 2 * Math.PI);
ctx.fill();
}
}
ctx.clip();
ctx.paint_with_alpha(alpha);
}
}
public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
}
public void cancel() {
}
}
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