hohmann-miner/physobj.rb

GRAV_CONSTANT = 1e+1
MAX_PATH_TRACK_POINT = 1000

class PhysObj
	attr_accessor :world, :saved_pos, :pos, :vel, :accel, :x, :y, :show_info, :angle, :parent_orbit, :accel_vecs
	attr_reader :name
	def initialize(name, world)
		@name = name
		@world = world
		@pos = Vector.zero(2)
		@vel = Vector.zero(2)
		@accel = Vector.zero(2)
		@x, @y = 0, 0
		@saved_pos = []
		@show_info = false
		@angle = 0
		@parent_orbit = ""
		@accel_vecs = Hash.new(Vector[0, 0])
	end

	def apply_accel_vecs
		summed_vec = Vector.zero(2)
		@accel_vecs.each do |planet, vec|
			summed_vec += vec
		end
		@accel = summed_vec
	end

	def tick
		@x, @y = @pos[0], @pos[1]
		@angle %= 360

		if( @accel.magnitude != 0 ) then
			@vel += @accel
		end

		if( @vel.magnitude != 0 ) then
			@pos += @vel
		end
		@saved_pos << @pos

		if(@saved_pos.length > MAX_PATH_TRACK_POINT) then
			@saved_pos = @saved_pos[1..-1]
		end
	end

	def render_path(x_offset=0, y_offset=0)
		@saved_pos.each do |pos|
			Gosu.draw_rect(pos[0] + x_offset, pos[1] + y_offset, 1, 1, Gosu::Color.argb(0xaa_ccccff))
		end
	end

	def debug_string
		return "\n#{self.name} - #{self.parent_orbit.name}\nVel: #{self.vel.magnitude.round(1)} #{self.vel.round(4)}\nAccel: #{self.accel.magnitude.round(4)} #{self.accel.round(4)}\nPos: #{self.pos.round(4)}\nAngle: #{self.angle.round(1)} deg\n"
	end

	def render(x_offset=0, y_offset=0, color=Gosu::Color.argb(0xaa_2222ff))
		if( @show_info ) then
			self.world.fonts[:normal].draw_text(self.debug_string, self.pos[0] + x_offset, self.pos[1] + y_offset, 1, 1.0, 1.0, color)
		end
	end

	def draw_vector(vec, scale=2, color=0xaf_ffaaaa, x_offset=0, y_offset=0)
		if( vec.magnitude != 0 ) then
			clr = Gosu::Color.argb(color)

			scaled_vec = vec*scale

			pos1 = Vector[x_offset, y_offset] + self.pos + Vector[self.width/2, self.height/2]
			pos2 = pos1 + scaled_vec
			
			x1 = pos1[0]
			y1 = pos1[1]

			x2 = pos2[0]
			y2 = pos2[1]

			Gosu.draw_line(x1, y1, clr, x2, y2, clr)
		end
	end

	def draw_direction(x_offset=0, y_offset=0)
		rads = (self.angle * Math::PI) / 180
		dir_vec = Vector[Math::cos(rads), Math::sin(rads)]
		self.draw_vector(dir_vec, 25, 0xaf_aaaaff, x_offset, y_offset)
	end
end