Stuff

app.rb

@@ -23,6 +23,8 @@ class Window < Gosu::Window
 	def draw
 		@physobjs.each do |obj| 
 			obj.render
+			obj.draw_vector(obj.vel, 10)
+			obj.draw_vector(obj.accel, 500, 0xff_aaffaa)
 		end
 	end
 end
@@ -30,12 +32,12 @@ end
 
 window = Window.new("Physics!", 1600, 900)
 
-planet = PhysCube.new(window, 16, 16, 0xff_aaffaa)
+planet = PhysCube.new("Earth", window, 16, 16, 0xff_aaffaa)
 planet.pos = Vector[800, 450]
 
-cube = PhysCube.new(window, 8, 8)
+cube = PhysCube.new("Cube", window, 8, 8)
-cube.accel = planet.pos * 0.001 
+cube.accel = Vector[0, 0.1] 
-cube.vel = Vector[2, 0]
+cube.vel = Vector[10, 0]
 
 window.physobjs << planet
 window.physobjs << cube

physobj.rb

@@ -2,7 +2,9 @@ require "matrix"
 
 class PhysObj
 	attr_accessor :world, :pos, :vel, :accel, :x, :y
-	def initialize(world)
+	attr_reader :name
+	def initialize(name, world)
+		@name = name
 		@world = world
 		@pos = Vector.zero(2)
 		@vel = Vector.zero(2)
@@ -26,8 +28,8 @@ end
 
 class PhysCube < PhysObj
 	attr_reader :width, :height
-	def initialize(world, width, height, color=0xff_ffffff, ela=-0.8)
+	def initialize(name, world, width, height, color=0xff_ffffff, ela=-0.8)
-		super world
+		super name, world
 
 		@width, @height = width, height
 		@color = Gosu::Color.argb(color)
@@ -37,7 +39,6 @@ class PhysCube < PhysObj
 	def render
 		x, y = self.pos[0], self.pos[1]
 		Gosu.draw_quad(x, y, @color, x + self.width, y, @color, x, y + self.height, @color, x + self.width, y + self.height, @color)
-		# self.draw_vector(@vel, 2)
 	end
 
 	def physics
@@ -47,21 +48,37 @@ class PhysCube < PhysObj
 		x_max = world.width - self.width
 		y_max = world.height - self.height
 
-		if( x > x_max ) then self.pos[0] = x_max end
+		if( x > x_max ) then 
+			self.pos[0] = x_max 
+			self.vel[0] = 0
+		end
 		if( y > y_max ) then 
 			self.pos[1] = y_max
-			self.vel[1] = -2
+			self.vel[1] = 0
-			self.vel[0] = 1
 		end
 
 	end
 
-	def draw_vector(vec, scale=0.1, color=0xaf_ffaaaa)
+	def draw_vector(vec, scale=2, color=0xaf_ffaaaa)
-		clr = Gosu::Color.argb(color)
+		if( vec.magnitude != 0 ) then
-		dx, dy = vec[0], vec[1]
+			clr = Gosu::Color.argb(color)
-		xx, yy = @x + @width/2, @y + @height/2
+
-		Gosu.draw_line(xx, yy, clr, (xx + dx).round(1) * scale, (yy + dy).round(1) * scale, clr)
+			scaled_vec = vec*scale
-		puts("#{dx} #{dy} #{[xx - (xx + dx), yy - (yy + dy)]}")
+
+			pos1 = 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*scale, y2*scale, clr)
+			Gosu.draw_line(x1, y1, clr, x2, y2, clr)
+
+			puts("#{self.name}: pos1:#{pos1} pos2:#{pos2}")
+		end
 	end
 
 end