init.rb

require "gosu"
require "opengl"
require "texplay"
require_relative "map.rb"
require_relative "camera.rb"

Gosu::enable_undocumented_retrofication

class Window < Gosu::Window
  attr_reader :camera, :map
  def initialize
    super(1280, 720, false)
    self.caption = "Ruby FPS"
    @map = Map.new( self,
                    "assets/map.png",
                    "assets/tileset.png",
                    "assets/walls.png" )

    @camera = Camera.new(self)
    @aim = Gosu::Image.new(self, "assets/aim.png", true)
    @character_minimap = Gosu::Image.new(self, "assets/character_minimap.png", true)
    @map_bg = Gosu::Image.new(self, "assets/map_bg.png", true)
  end

  def button_down(id)
    exit if id == Gosu::KbEscape
  end

  def draw_minimap
    chara_color = Gosu::Color.new(128, 0, 255, 0)
    map_color = Gosu::Color.new(128, 255, 255, 255)
    black_color = Gosu::Color.new(255, 255, 255, 255)
    clip_to(0, 0, 160, 120) do
      scale 6 do
        @map_bg.draw(0, 0, 0, 1, 1, black_color)
        x = @map.rect.width / 2
        y = @map.rect.length / 2 - 3
        z = 1
        angle = @camera.horizontal_angle + 90.0
        x_map = x - @camera.position.x - 0.1
        y_map = y - @camera.position.z + 0.05

        @map.map_texture.draw(x_map, y_map, 0, 1, 1, map_color)
        @character_minimap.draw_rot(x, y, z, angle, 0.5, 0.8, 1, 1, chara_color)
      end
    end
  end

  def draw
    gl do
      @camera.look
      @map.draw
    end
    @aim.draw((self.width / 2) - (@aim.width / 2), (self.height / 2) - (@aim.height / 2), 0, 0.8, 0.8)
    draw_minimap
  end

  def update
    @camera.update
  end
end

Window.new.show