1 files changed, 83 insertions, 0 deletions
diff --git a/plugins/shotwell-transitions/ClockEffect.vala b/plugins/shotwell-transitions/ClockEffect.vala
new file mode 100644
index 0000000..78b39a6
--- /dev/null
+++ b/plugins/shotwell-transitions/ClockEffect.vala
@@ -0,0 +1,83 @@
+/* Copyright 2013 Jens Bav
+ * Copyright 2011-2014 Yorba Foundation
+ *
+ * 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() {
+    }
+}