feat Create 2D animations

* Rakefile: Add subfolders to the lib directory.
* lib/animation/discrete.rb: Create a class for discrete animations.
This class needs tests.
* lib/animation/frame_2d.rb: Create a 2D frame to be used with discrete
animations

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/animation/frame_2d.rb b/lib/animation/frame_2d.rb
new file mode 100644
index 0000000..5d0b335
--- /dev/null
+++ b/lib/animation/frame_2d.rb
@@ -0,0 +1,31 @@
+# Copyright 2022-2023 Frederico de Oliveira Linhares
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+module CandyGear
+  module Animation
+    class Frame2D
+      def initialize(sprite, x, y, width, height)
+        @position = Vector4D.new(x, y, width, height);
+        @sprite = sprite;
+      end
+
+      def draw(view, pivot_x, pivot_y)
+        @sprite.draw(
+          view,
+          @position.x + pivot_x, @position.y + pivot_y,
+          @position.w, @position.h);
+      end
+    end
+  end
+end