The sun

app.rb

@@ -15,7 +15,7 @@ class Window < Gosu::Window
 		@planets = planets
 
 		@font = Gosu::Font.new(self, Gosu::default_font_name, 12)
-		@font2 = Gosu::Font.new(self, Gosu::default_font_name, 32)
+		@font2 = Gosu::Font.new(self, Gosu::default_font_name, 18)
 		@freeze = false
 	end
 
@@ -44,9 +44,8 @@ class Window < Gosu::Window
 	end
 
 	def draw
-		if( @freeze ) then
-			@font2.draw("FROZEN", 0, 0, 1, 1.0, 1.0, Gosu::Color::WHITE)
-		end
+		status_text = @freeze ? "FROZEN (Escape to unfreeze)" : "(Escape to freeze)"
+		@font2.draw(status_text, 0, 0, 1, 1.0, 1.0, Gosu::Color::WHITE)
 
 		@physobjs.each do |obj| 
 			obj.render
@@ -66,7 +65,7 @@ end
 
 window = Window.new("Physics!", 1600, 900)
 
-planet = Planet.new("Earth", window, 0xff_aaffaa)
+planet = Planet.new("Sol", window, 0xff_ffffaa, 1e2, 20, 120)
 planet.pos = Vector[800, 450]
 
 cube = PhysCube.new("Cube", window, 8, 8)
@@ -74,8 +73,8 @@ cube.pos = Vector[800, 450 + 200]
 cube.vel = Vector[2.5, 0]
 
 cube2 = PhysCube.new("Cube2", window, 8, 8)
-cube2.pos = Vector[800, 450 + 400]
-cube2.vel = Vector[1.25, 0]
+cube2.pos = Vector[800, 450 - 200]
+cube2.vel = Vector[-2.5, 0]
 planet.orbit([cube, cube2])
 
 window.planets << planet

physobj.rb

@@ -78,11 +78,16 @@ class PhysCube < PhysObj
 end
 
 
-class Planet < PhysCube
-	attr_reader :mass
-	def initialize(name, world, color, mass=1e+2)
-		super name, world, 40, 40, color
+class Planet < PhysObj
+	attr_reader :color, :mass, :radius, :circle_thickness
+	def initialize(name, world, color, mass=1e+2, radius=20, circle_thickness=4)
+		super name, world
+
+		@color = color
 		@mass = mass
+
+		@radius = radius
+		@circle_thickness = circle_thickness
 	end
 
 	private def calculate_gravity_scalar(obj, dir_vec)
@@ -91,7 +96,7 @@ class Planet < PhysCube
 	end
 
 	private def calculate_gravity_vector(obj)
-		dir_vec = self.pos - obj.pos + Vector[self.width/2, self.height/2]
+		dir_vec = self.pos - obj.pos + Vector[@radius/2, @radius/2]
 		return (dir_vec/dir_vec.magnitude) * calculate_gravity_scalar(obj, dir_vec)  
 	end
 
@@ -103,6 +108,6 @@ class Planet < PhysCube
 	end
 
 	def render
-		Gosu.draw_circle(self.pos[0], self.pos[1], 20, @color)
+		Gosu.draw_circle(self.pos[0], self.pos[1], @radius, @color, 0, @circle_thickness)
 	end
 end