#!/usr/bin/env rubyrequire 'gtk2'# require 'serialport' doesn't work, so use Kernel::requireKernel::require 'serialport'class SingleStripChart < Gtk::DrawingArea	def initialize(w, h, tv, bv, show_text=false)		super()		@topval = tv		@botval = bv		@dv = []		@last_val = 0		@back_color = Gdk::Color.new(0, 10000, 0)		@trace_color = Gdk::Color.new(40000, 65535, 40000)		set_size_request(w, h)		if show_text			layout = create_pango_layout		else			layout = nil		end		signal_connect('configure_event') do			back_gc = Gdk::GC.new(window)			back_gc.rgb_fg_color = @back_color			@pixmap = Gdk::Pixmap.new(self.window,					allocation.width,					allocation.height, -1)			@pixmap.draw_rectangle(back_gc, true,				0, 0, allocation.width, allocation.height)			@pm2 = Gdk::Pixmap.new(self.window,					allocation.width,					allocation.height, -1)			true		end		signal_connect('expose_event') do |widget, event|			window.draw_drawable(style.fg_gc(state),				@pixmap,				event.area.x, event.area.y,				event.area.x, event.area.y,				event.area.width, event.area.height)			if !layout.nil?				layout.set_markup("<span foreground='red' size='xx-large' face='monospace'>#{sprintf '%+.6f V', @last_val}</span>")				window.draw_layout(style.fg_gc(state), 2, 2, layout)			end			true		end	end	def updatePixmap		return if @pixmap == nil # if not configured		return if @dv.length <= 1		back_gc = Gdk::GC.new(window)		back_gc.rgb_fg_color = @back_color		trace_gc = Gdk::GC.new(window)		trace_gc.rgb_fg_color = @trace_color		delta = @dv.length - 1		@pm2.draw_drawable(style.fg_gc(state), @pixmap, 0, 0, 0, 0, -1, -1)		@pixmap.draw_drawable(style.fg_gc(state), @pm2, delta, 0, 0, 0, -1, -1)		@pixmap.draw_rectangle(back_gc, true,			allocation.width-delta, 0, delta, allocation.height)		x0 = allocation.width-1 - delta		while(@dv.length > 1)			sa = (@dv[0] - @botval) / (@topval - @botval)			sb = (@dv[1] - @botval) / (@topval - @botval)			fd = sb.floor - sa.floor			va = (sa * allocation.height) % allocation.height			vb = (sb * allocation.height) % allocation.height			if(fd == 0)				@pixmap.draw_line(trace_gc, x0, va, x0+1, vb)			else				@pixmap.draw_line(trace_gc, x0, va, x0+1, vb + fd*allocation.height)				@pixmap.draw_line(trace_gc, x0, va - fd*allocation.height, x0+1, vb)			end			@dv.shift			x0 = x0 + 1		end		update_rect = Gdk::Rectangle.new(			0, 0, allocation.width, allocation.height)		window.invalidate(update_rect, false)	end	def addVal(v)		@dv.push(v)		@last_val = v	endend############################################################class ScopeWindow < Gtk::Window	def initialize		super()		self.title = "Scope"		self.border_width = 0		self.realize		self.window.set_cursor(Gdk::Cursor.new(Gdk::Cursor::CROSSHAIR))		@charts = []		(0..5).each { |e|			r = 3.0 * (10.0 ** (-e.to_f))			show_text = e==0			@charts.push(SingleStripChart.new(1000, 100, -r, r, show_text))		}		totalbox = Gtk::VBox.new		self.add(totalbox)		@charts.each { |c| 			frame = Gtk::Frame.new			frame.shadow_type = Gtk::SHADOW_IN			frame.add(c)			totalbox.pack_start(frame) 		}		self.signal_connect('delete_event') do			Gtk.main_quit			false		end		self.signal_connect('key_press_event') do |widget, event|			if(event.state & Gdk::Window::CONTROL_MASK) != 0				if(event.keyval == Gdk::Keyval::GDK_w ||				   event.keyval == Gdk::Keyval::GDK_q)					Gtk.main_quit				end			end		end		GLib::Timeout.add(50) do			@charts.each { |c| c.updatePixmap }			true		end	end	def addVal(val)		@charts.each { |c| c.addVal(val) }	endendif ARGV.length != 1	raise "Usage: $0 <port>"endportname = ARGV[0]sp = SerialPort.new(portname, 115200, 8, 1, SerialPort::NONE)charts = ScopeWindow.newlines = []Thread.new {	while true do		lines << sp.gets	end}GLib::Timeout.add(10) do	while !lines.empty?		line = lines.shift		line.chomp		if line =~ /^\d+\s+([0-9.-]+)/			val = $1.to_f			charts.addVal(val)		else			puts "received: #{line}"		end	end	trueendcharts.show_allGtk.main