Add shapes following eyes example

examples/README.md

@@ -78,6 +78,7 @@ Examples using raylib shapes drawing functionality.
 | 32 | [shapes_bouncing_ball](shapes/shapes_bouncing_ball.rb)                     | <img src="shapes/shapes_bouncing_ball.png" alt="shapes_bouncing_ball" width="80"> | ⭐️☆☆☆ | 2.5 | 2.5 | [Ray](https://github.com/raysan5) |
 | 33 | [shapes_colors_palette](shapes/shapes_colors_palette.rb)                   | <img src="shapes/shapes_colors_palette.png" alt="shapes_colors_palette" width="80"> | ⭐️⭐️☆☆ | 1.0 | 2.5 | [Ray](https://github.com/raysan5) |
 | 38 | [shapes_collision_area](shapes/shapes_collision_area.rb)                   | <img src="shapes/shapes_collision_area.png" alt="shapes_collision_area" width="80"> | ⭐️⭐️☆☆ | 2.5 | 2.5 | [Ray](https://github.com/raysan5) |
+| 39 | [shapes_following_eyes](shapes/shapes_following_eyes.rb)                   | <img src="shapes/shapes_following_eyes.png" alt="shapes_following_eyes" width="80"> | ⭐️⭐️☆☆ | 2.5 | 2.5 | [Ray](https://github.com/raysan5) |
 | 40 | [shapes_easings_ball_anim](shapes/shapes_easings_ball_anim.rb)             | <img src="shapes/shapes_easings_ball_anim.png" alt="shapes_easings_ball_anim" width="80"> | ⭐️⭐️☆☆ | 2.5 | 2.5 | [Ray](https://github.com/raysan5) |
 | 41 | [shapes_easings_box_anim](shapes/shapes_easings_box_anim.rb)               | <img src="shapes/shapes_easings_box_anim.png" alt="shapes_easings_box_anim" width="80"> | ⭐️⭐️☆☆ | 2.5 | 2.5 | [Ray](https://github.com/raysan5) |
 | 42 | [shapes_easings_rectangle_array](shapes/shapes_easings_rectangle_array.rb) | <img src="shapes/shapes_easings_rectangle_array.png" alt="shapes_easings_rectangle_array" width="80"> | ⭐️⭐️⭐️☆ | 2.5 | 2.5 | [Ray](https://github.com/raysan5) |

examples/shapes/shapes_following_eyes.rb

@@ -0,0 +1,92 @@
+# ******************************************************************************************
+# 
+#   raylib [shapes] example - following eyes
+#
+#   Example originally created with raylib 2.5, last time updated with raylib 2.5
+# 
+#   Example ported to Ruby by Wilson Silva (@wilsonsilva). Works with Raylib 4.5
+#
+#   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+#   BSD-like license that allows static linking with closed source software
+#
+#   Copyright (c) 2013-2023 Ramon Santamaria (@raysan5)
+#
+# ******************************************************************************************
+
+require 'bundler/setup'
+require 'raylib'
+
+# Initialization
+# --------------------------------------------------------------------------------------
+SCREEN_WIDTH = 800
+SCREEN_HEIGHT = 450
+
+Raylib.init_window(SCREEN_WIDTH, SCREEN_HEIGHT, 'raylib [shapes] example - following eyes')
+
+sclera_left_position = Raylib::Vector2.create(Raylib.get_screen_width/2.0 - 100.0, Raylib.get_screen_height/2.0)
+sclera_right_position = Raylib::Vector2.create(Raylib.get_screen_width/2.0 + 100.0, Raylib.get_screen_height/2.0)
+sclera_radius = 80
+
+iris_radius = 24
+
+Raylib.set_target_fps(60)
+# --------------------------------------------------------------------------------------
+
+# Main game loop
+until Raylib.window_should_close # Detect window close button or ESC key
+  # Update
+  # ----------------------------------------------------------------------------------
+  iris_left_position = Raylib.get_mouse_position
+  iris_right_position = Raylib.get_mouse_position
+
+  # Check not inside the left eye sclera
+  unless Raylib.check_collision_point_circle(iris_left_position, sclera_left_position, sclera_radius - 20)
+    dx = iris_left_position.x - sclera_left_position.x
+    dy = iris_left_position.y - sclera_left_position.y
+
+    angle = Math.atan2(dy, dx)
+
+    dxx = (sclera_radius - iris_radius)*Math.cos(angle)
+    dyy = (sclera_radius - iris_radius)*Math.sin(angle)
+
+    iris_left_position.x = sclera_left_position.x + dxx
+    iris_left_position.y = sclera_left_position.y + dyy
+  end
+
+  # Check not inside the right eye sclera
+  unless Raylib.check_collision_point_circle(iris_right_position, sclera_right_position, sclera_radius - 20)
+    dx = iris_right_position.x - sclera_right_position.x
+    dy = iris_right_position.y - sclera_right_position.y
+
+    angle = Math.atan2(dy, dx)
+
+    dxx = (sclera_radius - iris_radius)*Math.cos(angle)
+    dyy = (sclera_radius - iris_radius)*Math.sin(angle)
+
+    iris_right_position.x = sclera_right_position.x + dxx
+    iris_right_position.y = sclera_right_position.y + dyy
+  end
+  # ----------------------------------------------------------------------------------
+
+  # Draw
+  # ----------------------------------------------------------------------------------
+  Raylib.begin_drawing
+  Raylib.clear_background(Raylib::RAYWHITE)
+
+  Raylib.draw_circle_v(sclera_left_position, sclera_radius, Raylib::LIGHTGRAY)
+  Raylib.draw_circle_v(iris_left_position, iris_radius, Raylib::BROWN)
+  Raylib.draw_circle_v(iris_left_position, 10, Raylib::BLACK)
+
+  Raylib.draw_circle_v(sclera_right_position, sclera_radius, Raylib::LIGHTGRAY)
+  Raylib.draw_circle_v(iris_right_position, iris_radius, Raylib::DARKGREEN)
+  Raylib.draw_circle_v(iris_right_position, 10, Raylib::BLACK)
+
+  Raylib.draw_fps(10, 10)
+  Raylib.end_drawing
+  # ----------------------------------------------------------------------------------
+end
+
+# De-Initialization
+# --------------------------------------------------------------------------------------
+Raylib.close_window # Close window and OpenGL context
+# --------------------------------------------------------------------------------------