1 files changed, 58 insertions, 0 deletions
diff --git a/lib/animation.rb b/lib/animation.rb
new file mode 100644
index 0000000..7da2898
--- /dev/null
+++ b/lib/animation.rb
@@ -0,0 +1,58 @@
+# Copyright 2022 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
+  class Animation
+    Frame = Struct.new(:duration, :index);
+
+    attr_reader(:index);
+
+    def initialize(sequence, repeat = true)
+      @sequence = sequence;
+      @repeat = repeat;
+
+      self.reset();
+    end
+
+    def tick()
+      return @index if @sequence_is_over;
+
+      @current_time += 1;
+      frame = @sequence[@current_frame];
+
+      if @current_time >= frame.duration then
+        @current_time = 0;
+        @current_frame += 1;
+
+        if @current_frame >= @sequence.size() then
+          if @repeat then
+            @current_frame = 0;
+          else
+            @current_frame -= 1;
+            @sequence_is_over = true;
+          end
+        end
+      end
+
+      return @index = frame.index();
+    end
+
+    def reset()
+      @current_time = 0;
+      @current_frame = 0;
+      @index = @sequence[0].index;
+      @sequence_is_over = false;
+    end
+  end
+end