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113 lines
2.2 KiB
113 lines
2.2 KiB
require "matrix"
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GRAV_CONSTANT = 1e+2
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class PhysObj
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attr_accessor :world, :saved_pos, :pos, :vel, :accel, :x, :y
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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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end
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def tick
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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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@x, @y = @pos[0], @pos[1]
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@saved_pos << @pos
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end
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def render_path
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@saved_pos.each do |pos|
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Gosu.draw_rect(pos[0], pos[1], 1, 1, Gosu::Color.argb(0xaa_ccccff))
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end
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end
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end
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class PhysCube < PhysObj
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attr_reader :width, :height
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def initialize(name, world, width, height, color=0xff_ffffff, ela=-0.8)
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super name, world
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@width, @height = width, height
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@color = Gosu::Color.argb(color)
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@ela = ela
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end
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def render
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x, y = self.pos[0], self.pos[1]
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Gosu.draw_quad(x, y, @color, x + self.width, y, @color, x, y + self.height, @color, x + self.width, y + self.height, @color)
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end
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def physics
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self.tick
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# x, y = self.pos[0], self.pos[1]
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# x_max = world.width - self.width
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# y_max = world.height - self.height
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#
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# if( x > x_max ) then
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# self.pos[0] = x_max
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# self.vel[0] = 0
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# end
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# if( y > y_max ) then
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# self.pos[1] = y_max
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# self.vel[1] = 0
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# end
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end
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def draw_vector(vec, scale=2, color=0xaf_ffaaaa)
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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 = 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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end
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class Planet < PhysCube
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attr_reader :gravity
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def initialize(name, world, color, gravity=0.05)
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super name, world, 10, 10, color
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@gravity = gravity
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end
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private def calculate_gravity_vector(obj)
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dir_vec = self.pos - obj.pos + Vector[self.width/2, self.height/2]
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return dir_vec * self.gravity
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# return (self.gravity * dir_vec)/(dir_vec.magnitude)
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end
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def orbit(physobjs)
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physobjs.each do |obj|
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grav_vec = self.calculate_gravity_vector(obj)
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obj.accel = grav_vec
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end
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end
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end
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