From 5baa7560704117c5528c9903c218df73793c8a33 Mon Sep 17 00:00:00 2001
From: Frederico Linhares <fred@linhares.blue>
Date: Thu, 26 May 2022 11:26:28 -0300
Subject: test Collision and alignment detection

---
 test/Rakefile              |  2 +-
 test/src/main.rb           | 10 +++---
 test/src/mode/collision.rb | 87 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+), 7 deletions(-)
 create mode 100644 test/src/mode/collision.rb

diff --git a/test/Rakefile b/test/Rakefile
index 586f646..c449fad 100644
--- a/test/Rakefile
+++ b/test/Rakefile
@@ -14,7 +14,7 @@
 
 OBJ = 'test'
 
-RB_FILES = FileList['src/*.rb']
+RB_FILES = FileList['src/**/*.rb']
 
 task :build do
   rb_files = RB_FILES.inject('') {_1 + "#{_2} "}
diff --git a/test/src/main.rb b/test/src/main.rb
index d5254db..9e37faa 100644
--- a/test/src/main.rb
+++ b/test/src/main.rb
@@ -13,15 +13,13 @@
 # limitations under the License.
 
 def init()
+  $mode = Mode::Collision.new();
 end
 
-def key_down(key)
-end
+def key_down(key) = $mode.controller.key_down(key);
 
-def key_up(key)
-end
+def key_up(key) = $mode.controller.key_up(key);
 
 def quit() = CandyGear.quit();
 
-def tick()
-end
+def tick() = $mode.tick();
diff --git a/test/src/mode/collision.rb b/test/src/mode/collision.rb
new file mode 100644
index 0000000..dddfd5a
--- /dev/null
+++ b/test/src/mode/collision.rb
@@ -0,0 +1,87 @@
+# 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 Mode
+  class Collision
+    WINDOW_WIDTH = 640;
+    WINDOW_HEIGHT = 360;
+
+    class Square
+      attr_reader(:rect);
+
+      def initialize(x, y, vertical_direction, horizontal_direction)
+        @rect = CandyGear::Rect.new(x, y, 16, 16);
+        @vertical_direction = vertical_direction;
+        @horizontal_direction = horizontal_direction;
+      end
+
+      def x() = @rect.x;
+      def y() = @rect.y;
+
+      def draw() = @rect.draw_fill();
+
+      def tick()
+        case @vertical_direction
+        when :left
+          @rect.x -= 2;
+          @vertical_direction = :right if @rect.x < 0;
+        when :right
+          @rect.x += 2;
+          if @rect.x > WINDOW_WIDTH - @rect.width() then
+            @vertical_direction = :left;
+          end
+        end
+
+        case @horizontal_direction
+        when :up
+          @rect.y -= 2;
+          @horizontal_direction = :down if @rect.y < 0;
+        when :down
+          @rect.y += 2;
+          if @rect.y > WINDOW_HEIGHT - @rect.height() then
+            @horizontal_direction = :up;
+          end
+        end
+      end
+    end
+
+    def initialize()
+      @normal_color = CandyGear::Color.new(0x99, 0x99, 0x99);
+      @collision_color = CandyGear::Color.new(0x99, 0x33, 0x33);
+      @vertical_align_color = CandyGear::Color.new(0x33, 0x99, 0x33);
+      @horizontal_align_color = CandyGear::Color.new(0x33, 0x33, 0x99);
+
+      @square1 = Square.new(213, 120, :left, :down);
+      @square2 = Square.new(427, 240, :right, :down);
+    end
+
+    def tick()
+      @square1.tick();
+      @square2.tick();
+
+      if @square1.rect.collide?(@square2.rect) then
+        CandyGear::Graphic.set_color(@collision_color);
+      elsif @square1.rect.align_horizontally?(@square2.rect) then
+        CandyGear::Graphic.set_color(@horizontal_align_color);
+      elsif @square1.rect.align_vertically?(@square2.rect) then
+        CandyGear::Graphic.set_color(@vertical_align_color);
+      else
+        CandyGear::Graphic.set_color(@normal_color);
+      end
+
+      @square1.draw();
+      @square2.draw();
+    end
+  end
+end
-- 
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