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87 lines
2.1 KiB
87 lines
2.1 KiB
GRAV_CONSTANT = 1e+1
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MAX_PATH_TRACK_POINT = 1000
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class PhysObj
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attr_accessor :world, :saved_pos, :pos, :vel, :accel, :x, :y, :show_info, :angle, :parent_orbit, :accel_vecs
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attr_reader :name
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def initialize(name, world)
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@name = name
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@world = world
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@pos = Vector.zero(2)
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@vel = Vector.zero(2)
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@accel = Vector.zero(2)
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@x, @y = 0, 0
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@saved_pos = []
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@show_info = false
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@angle = 0
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@parent_orbit = ""
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@accel_vecs = Hash.new(Vector[0, 0])
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end
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def apply_accel_vecs
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summed_vec = Vector.zero(2)
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@accel_vecs.each do |planet, vec|
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summed_vec += vec
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end
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@accel = summed_vec
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end
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def tick
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@x, @y = @pos[0], @pos[1]
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@angle %= 360
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if( @accel.magnitude != 0 ) then
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@vel += @accel
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end
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if( @vel.magnitude != 0 ) then
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@pos += @vel
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end
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@saved_pos << @pos
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if(@saved_pos.length > MAX_PATH_TRACK_POINT) then
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@saved_pos = @saved_pos[1..-1]
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end
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end
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def render_path(x_offset=0, y_offset=0)
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@saved_pos.each do |pos|
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Gosu.draw_rect(pos[0] + x_offset, pos[1] + y_offset, 1, 1, Gosu::Color.argb(0xaa_ccccff))
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end
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end
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def debug_string
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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"
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end
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def render(x_offset=0, y_offset=0, color=Gosu::Color.argb(0xaa_2222ff))
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if( @show_info ) then
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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)
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end
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end
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def draw_vector(vec, scale=2, color=0xaf_ffaaaa, x_offset=0, y_offset=0)
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if( vec.magnitude != 0 ) then
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clr = Gosu::Color.argb(color)
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scaled_vec = vec*scale
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pos1 = Vector[x_offset, y_offset] + self.pos + Vector[self.width/2, self.height/2]
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pos2 = pos1 + scaled_vec
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x1 = pos1[0]
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y1 = pos1[1]
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x2 = pos2[0]
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y2 = pos2[1]
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Gosu.draw_line(x1, y1, clr, x2, y2, clr)
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end
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end
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def draw_direction(x_offset=0, y_offset=0)
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rads = (self.angle * Math::PI) / 180
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dir_vec = Vector[Math::cos(rads), Math::sin(rads)]
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self.draw_vector(dir_vec, 25, 0xaf_aaaaff, x_offset, y_offset)
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end
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end
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