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|
# frozen_string_literal: true
# require_relative "camera/version"
# require_relative "camera/triangle"
require 'ruby2d'
Dir[File.join(__dir__, 'camera', '*.rb')].sort.each { |file| require file }
# Handles rendering objects relative
# to a camera location
module Ruby2D
module Camera
class << self
private
# Contains all objects that are tracked
def objects
@objects ||= []
end
end
def self._sort_by_z
@sort_by_z = true
end
def self._resolve_z_sorting
objects.sort_by!(&:z) if @sort_by_z
@sort_by_z = false
end
def self.debug_x
@debug_x ||= 0
end
def self.debug_x=(debug_x)
@debug_x = debug_x
end
def self.debug_y
@debug_y ||= 0
end
def self.debug_y=(debug_y)
@debug_y = debug_y
end
# Adding objects so they are
# tracked by the Camera
def self.<<(item)
unless objects.include?(item)
objects.push(item)
self._sort_by_z
end
end
def self.remove(item)
objects.delete(item) if objects.include?(item)
end
# Redraw all objects that
# are tracked by the Camera
def self._redraw(auto_purge: false)
self._resolve_z_sorting
objects.each(&:_draw)
end
# Variables changing Camera properties
def self._x(x)
@x += x
end
def self._y(y)
@y += y
end
def self.x
@x ||= 0
end
def self.x=(x)
@x = x
end
def self.y
@y ||= 0
end
def self.y=(y)
@y = y
end
def self.zoom
@zoom ||= 1.0
end
def self.zoom=(zoom)
@zoom = zoom
end
def self.angle
@angle ||= 0
end
def self.angle=(angle)
angle %= 360
@angle = angle
end
# Convert screenspace coordinates into worldspace camera ones
def self.coordinate_to_worldspace(x, y)
angle = Camera.angle * (Math::PI / 180)
half_width = Window.width * 0.5
half_height = Window.height * 0.5
[(((x - half_width) / zoom) * Math.cos(-angle)) - (((y - half_height) / zoom) * Math.sin(-angle)) + self.x,
(((x - half_width) / zoom) * Math.sin(-angle)) + (((y - half_height) / zoom) * Math.cos(-angle)) + self.y]
end
# Convert worldspace camera coordinates into screenspace ones
def self.coordinate_to_screenspace(x, y)
angle = Camera.angle * (Math::PI / 180)
[(((x - Camera.x) * Math.cos(angle)) - ((y - Camera.y) * Math.sin(angle))) * Camera.zoom + (Window.width * 0.5),
(((x - Camera.x) * Math.sin(angle)) + ((y - Camera.y) * Math.cos(angle))) * Camera.zoom + (Window.height * 0.5)]
end
end
end
module Ruby2D
class Window
def update(&aproc)
@update_proc = (aproc << proc { Ruby2D::Camera._redraw })
true
end
end
end
|
