Gravity

prog2/gametest/Gemfile

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+source "https://rubygems.org"
+
+gem "gosu"

prog2/gametest/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    gosu (1.2.0)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  gosu
+
+BUNDLED WITH
+   2.2.28

prog2/gametest/app.rb

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+#!/usr/bin/ruby -w
+require "gosu"
+
+class Arch < Gosu::Image
+	attr_accessor :xspeed, :yspeed, :xaccel, :yaccel, :ela, :x, :y
+	attr_reader :width, :height
+	def initialize(src, xspeed=0, yspeed=0, xaccel=0, yaccel=0.1, ela=-0.5, xpos=0, ypos=0)
+		super src
+		@x, @y = xpos, ypos
+		@xspeed, @yspeed = xspeed, yspeed
+		@xaccel, @yaccel = xaccel, yaccel
+		@ela = ela
+		@width, @height = 64, 64
+	end
+end
+
+class Game < Gosu::Window
+	attr_accessor :caption
+	attr_reader :width, :height
+
+	def initialize(width, height)
+		super width, height
+		@width, @height = width, height
+		self.caption = "Test | #{width}x#{height}"
+
+		@arch = Arch.new("arch.png", 0, 0, 0, 0.1, -0.8)
+	end
+
+	def update
+		@arch.xspeed += @arch.xaccel
+		@arch.yspeed += @arch.yaccel
+
+		@arch.x += @arch.xspeed 
+		@arch.y += @arch.yspeed 
+
+		if( @arch.y > self.height - @arch.height ) then
+			@arch.yspeed *= @arch.ela
+		end
+
+		if( @arch.x > self.width - @arch.width ) then
+			@arch.x = self.width - @arch.width
+		end
+		puts("#{@arch.x}, #{@arch.y}")
+	end
+
+	def draw
+		@arch.draw(@arch.x, @arch.y, 0)
+	end
+end
+
+game = Game.new(640, 480)
+game.show