Add textures sprite button example

Author: wilsonsilva

examples/textures/resources/button.png

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+# ******************************************************************************************
+#
+#   raylib [textures] example - sprite button
+#
+#   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) 2019-2023 Ramon Santamaria (@raysan5)
+#
+# ******************************************************************************************
+
+require 'bundler/setup'
+require 'raylib'
+
+NUM_FRAMES = 3 # Number of frames (rectangles) for the button sprite texture
+
+# Initialization
+# --------------------------------------------------------------------------------------
+SCREEN_WIDTH = 800
+SCREEN_HEIGHT = 450
+
+Raylib.init_window(SCREEN_WIDTH, SCREEN_HEIGHT, 'raylib [textures] example - sprite button')
+
+Raylib.init_audio_device # Initialize audio device
+
+fx_button = Raylib.load_sound(File.join(__dir__, 'resources/buttonfx.wav')) # Load button sound
+button = Raylib.load_texture(File.join(__dir__, 'resources/button.png')) # Load button texture
+
+# Define frame rectangle for drawing
+frame_height = button.height / NUM_FRAMES.to_f
+source_rec = Raylib::Rectangle.create(0, 0, button.width.to_f, frame_height)
+
+# Define button bounds on screen
+btn_bounds = Raylib::Rectangle.create(
+  SCREEN_WIDTH / 2.0 - button.width / 2.0,
+  SCREEN_HEIGHT / 2.0 - button.height / NUM_FRAMES / 2.0,
+  button.width.to_f,
+  frame_height
+)
+
+Raylib.set_target_fps(60)
+# --------------------------------------------------------------------------------------
+
+# Main game loop
+until Raylib.window_should_close # Detect window close button or ESC key
+  # Update
+  # ----------------------------------------------------------------------------------
+  mouse_point = Raylib.get_mouse_position
+  btn_action = false
+
+  # Check button state 0-NORMAL, 1-MOUSE_HOVER, 2-PRESSED
+  if Raylib.check_collision_point_rec(mouse_point, btn_bounds)
+    if Raylib.is_mouse_button_down(Raylib::MOUSE_BUTTON_LEFT)
+      btn_state = 2
+    else
+      btn_state = 1
+    end
+
+    btn_action = true if Raylib.is_mouse_button_released(Raylib::MOUSE_BUTTON_LEFT)
+  else
+    btn_state = 0
+  end
+
+  Raylib.play_sound(fx_button) if btn_action
+
+  # Calculate button frame rectangle to draw depending on button state
+  source_rec.y = btn_state * frame_height
+  # ----------------------------------------------------------------------------------
+
+  # Draw
+  # ----------------------------------------------------------------------------------
+  Raylib.begin_drawing
+  Raylib.clear_background(Raylib::RAYWHITE)
+
+  Raylib.draw_texture_rec(button, source_rec, Raylib::Vector2.create(btn_bounds.x, btn_bounds.y), Raylib::WHITE)  # Draw button frame
+
+  Raylib.end_drawing
+  # ----------------------------------------------------------------------------------
+end
+
+# De-Initialization
+# --------------------------------------------------------------------------------------
+Raylib.unload_texture(button)  # Unload button texture
+Raylib.unload_sound(fx_button) # Unload sound
+Raylib.close_audio_device      # Close audio device
+Raylib.close_window            # Close window and OpenGL context
+# --------------------------------------------------------------------------------------