1/* Copyright 2013 Jens Bav 2 * Copyright 2016 Software Freedom Conservancy Inc. 3 * 4 * This software is licensed under the GNU Lesser General Public License 5 * (version 2.1 or later). See the COPYING file in this distribution. 6 */ 7 8using Spit; 9 10private class ChessEffectDescriptor : ShotwellTransitionDescriptor { 11 public ChessEffectDescriptor(GLib.File resource_directory) { 12 base(resource_directory); 13 } 14 15 public override unowned string get_id() { 16 return "org.yorba.shotwell.transitions.chess"; 17 } 18 19 public override unowned string get_pluggable_name() { 20 return _("Chess"); 21 } 22 23 public override Transitions.Effect create(HostInterface host) { 24 return new ChessEffect(); 25 } 26} 27 28private class ChessEffect : Object, Transitions.Effect { 29 private const int DESIRED_FPS = 25; 30 private const int MIN_FPS = 10; 31 private const int SQUARE_SIZE = 100; 32 private double square_count_x; 33 private double square_count_y; 34 35 public ChessEffect() { 36 } 37 38 public void get_fps(out int desired_fps, out int min_fps) { 39 desired_fps = ChessEffect.DESIRED_FPS; 40 min_fps = ChessEffect.MIN_FPS; 41 } 42 43 public void start(Transitions.Visuals visuals, Transitions.Motion motion) { 44 square_count_y = visuals.to_pos.height / SQUARE_SIZE + 2; 45 square_count_x = visuals.to_pos.width / SQUARE_SIZE + 2; 46 } 47 48 public bool needs_clear_background() { 49 return true; 50 } 51 52 public void paint(Transitions.Visuals visuals, Transitions.Motion motion, Cairo.Context ctx, 53 int width, int height, int frame_number) { 54 double alpha = motion.get_alpha(frame_number); 55 double size = 2 * alpha * SQUARE_SIZE; 56 if (visuals.from_pixbuf != null) { 57 Gdk.cairo_set_source_pixbuf(ctx, visuals.from_pixbuf, visuals.from_pos.x, 58 visuals.from_pos.y); 59 ctx.paint_with_alpha(1 - alpha); 60 } 61 62 if (visuals.to_pixbuf != null) { 63 Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf,visuals.to_pos.x, visuals.to_pos.y); 64 for (double y = 0; y <= square_count_y; y++) { 65 for (double x = 0; x <= square_count_x; x++) { 66 double translation = (x+y) % 2 == 0 ? -1.5 * SQUARE_SIZE : 1.5 * SQUARE_SIZE; 67 if (motion.direction == Transitions.Direction.FORWARD) { 68 ctx.rectangle(visuals.to_pos.x + translation + x * SQUARE_SIZE, 69 visuals.to_pos.y + y * SQUARE_SIZE, size, SQUARE_SIZE); 70 } else { 71 ctx.rectangle(visuals.to_pos.x + visuals.to_pos.width + translation - x 72 * SQUARE_SIZE - size, visuals.to_pos.y + y * SQUARE_SIZE, size, 73 SQUARE_SIZE); 74 } 75 } 76 } 77 78 ctx.clip(); 79 ctx.paint_with_alpha(alpha); 80 } 81 } 82 83 public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) { 84 } 85 86 public void cancel() { 87 } 88} 89