synced samples

1 files changed, 98 insertions, 0 deletions

diff --git a/samples/03_rendering_sprites/02_animation_using_sprite_sheet/app/main.rb b/samples/03_rendering_sprites/02_animation_using_sprite_sheet/app/main.rb
new file mode 100644
index 0000000..17bfd49
--- /dev/null
+++ b/samples/03_rendering_sprites/02_animation_using_sprite_sheet/app/main.rb
@@ -0,0 +1,98 @@
+def tick args
+  args.state.player.x ||= 100
+  args.state.player.y ||= 100
+  args.state.player.w ||= 64
+  args.state.player.h ||= 64
+  args.state.player.direction ||= 1
+
+  args.state.player.is_moving = false
+
+  # get the keyboard input and set player properties
+  if args.inputs.keyboard.right
+    args.state.player.x += 3
+    args.state.player.direction = 1
+    args.state.player.started_running_at ||= args.state.tick_count
+  elsif args.inputs.keyboard.left
+    args.state.player.x -= 3
+    args.state.player.direction = -1
+    args.state.player.started_running_at ||= args.state.tick_count
+  end
+
+  if args.inputs.keyboard.up
+    args.state.player.y += 1
+    args.state.player.started_running_at ||= args.state.tick_count
+  elsif args.inputs.keyboard.down
+    args.state.player.y -= 1
+    args.state.player.started_running_at ||= args.state.tick_count
+  end
+
+  # if no arrow keys are being pressed, set the player as not moving
+  if !args.inputs.keyboard.directional_vector
+    args.state.player.started_running_at = nil
+  end
+
+  # wrap player around the stage
+  if args.state.player.x > 1280
+    args.state.player.x = -64
+    args.state.player.started_running_at ||= args.state.tick_count
+  elsif args.state.player.x < -64
+    args.state.player.x = 1280
+    args.state.player.started_running_at ||= args.state.tick_count
+  end
+
+  if args.state.player.y > 720
+    args.state.player.y = -64
+    args.state.player.started_running_at ||= args.state.tick_count
+  elsif args.state.player.y < -64
+    args.state.player.y = 720
+    args.state.player.started_running_at ||= args.state.tick_count
+  end
+
+  # render player as standing or running
+  if args.state.player.started_running_at
+    args.outputs.sprites << running_sprite(args)
+  else
+    args.outputs.sprites << standing_sprite(args)
+  end
+  args.outputs.labels << [30, 700, "Use arrow keys to move around."]
+end
+
+def standing_sprite args
+  {
+    x: args.state.player.x,
+    y: args.state.player.y,
+    w: args.state.player.w,
+    h: args.state.player.h,
+    path: "sprites/horizontal-stand.png",
+    flip_horizontally: args.state.player.direction > 0
+  }
+end
+
+def running_sprite args
+  if !args.state.player.started_running_at
+    tile_index = 0
+  else
+    how_many_frames_in_sprite_sheet = 6
+    how_many_ticks_to_hold_each_frame = 3
+    should_the_index_repeat = true
+    tile_index = args.state
+                     .player
+                     .started_running_at
+                     .frame_index(how_many_frames_in_sprite_sheet,
+                                  how_many_ticks_to_hold_each_frame,
+                                  should_the_index_repeat)
+  end
+
+  {
+    x: args.state.player.x,
+    y: args.state.player.y,
+    w: args.state.player.w,
+    h: args.state.player.h,
+    path: 'sprites/horizontal-run.png',
+    tile_x: 0 + (tile_index * args.state.player.w),
+    tile_y: 0,
+    tile_w: args.state.player.w,
+    tile_h: args.state.player.h,
+    flip_horizontally: args.state.player.direction > 0,
+  }
+end