phosphorescence: December 2010

Wednesday, December 22, 2010

Winter brake 2010-2011

I take a winter brake, so I suspend posts and comments to this blog for a moment. Resume will be January 8, 2011.

I wish you a Merry Christmas and a Happy New Year.

Monday, December 20, 2010

Abbrev for Multibyte characters

Labels: JRuby, Ruby

Each Ruby implementations have distinct behavior of abbrev library (in Japanese). There is a sample program:

# -*- coding: UTF-8 -*-
require 'abbrev'

puts RUBY_VERSION
result = Abbrev.abbrev(%w{あしたあなた})
puts result, result.count

"あした" means "tomorrow", and "あなた" means "you". So let's run this script on Ruby 1.9(Linux), JRuby(Linux) and IronRuby(Windows).

Studying F# : Local Calendars #2

Labels: F#

(continued from phosphorescence: Studying F# : Local Calendars)

In previous article, I try to retrieve System.DateTime with local calendar. And in this article, I try to display the date and its local era with local calendar in local "culture". In .NET/CLR terminology, "culture" is equivalent with "locale".

> open System;;
> open System.Globalization;;
> let japanInfo = new CultureInfo("ja-JP");;

val japanInfo : CultureInfo = ja-JP

> japanInfo.DateTimeFormat.Calendar <- new JapaneseCalendar();;
val it : unit = ()
> DateTime.Now.ToString("D", japanInfo);;
val it : string = "平成 22年12月17日"

"平成" is the era pronouncing "Heisei".

Tuesday, December 14, 2010

Studying F# : Local Calendars

Labels: F#

One of the most useful features in .NET/CLR is supporting not only Gregorian calendar but also many local calendars. For me, it is awesome that there is the Japanese Calendar (in Japanese : 和暦 / pronounce "wareki").

For instance, Era 3 (Shouwa) ends at 1989/01/07 (Shouwa 64) and Era 4 (Heisei) starts at 1989/01/08 (Heisei 1). Of course, F# (on .NET/CLR) supports these like below:

> let wareki = new System.Globalization.JapaneseCalendar();;

val wareki : System.Globalization.JapaneseCalendar

> wareki.GetYear(new System.DateTime(1989, 1, 7));;
val it : int = 64
> wareki.GetEra(new System.DateTime(1989, 1, 7));;
val it : int = 3
> wareki.GetYear(new System.DateTime(1989, 1, 8));;
val it : int = 1
> wareki.GetEra(new System.DateTime(1989, 1, 8));;
val it : int = 4

And when System.DateTime is initialized with the Japanese Calendar, its Era is indicated for 4 (Heisei). For example, This year is Heisei 22 in the Japanese Calendar:

> new System.DateTime(22, 12, 14, wareki);;
val it : System.DateTime = 2010/12/14 0:00:00 {Date = 2010/12/14 0:00:00;
                                               Day = 14;
                                               DayOfWeek = Tuesday;
                                               DayOfYear = 348;
                                               Hour = 0;
                                               Kind = Unspecified;
                                               Millisecond = 0;
                                               Minute = 0;
                                               Month = 12;
                                               Second = 0;
                                               Ticks = 634278816000000000L;
                                               TimeOfDay = 00:00:00;
                                               Year = 2010;}

Saturday, December 11, 2010

Qt Conference - Tokyo 2010

Labels: event, mingw, Qt

In yesterday, Qt Conference - Tokyo 2010 was held at Akihabara, Tokyo. There are many sessions like below:

Keynote 1

Speaker: Daniel Kihlberg

Japan: 45% growth on the web in 2010

Nokia is now shipping devices with Qt

Qt 4.7: Increased performance and QML

Open governance of Qt

Qt Certification

Qt = the application platform

Bridges Symbian and Meego

eating our own dog food

Meego focuses open innovation

Application Vendors, Chipset Vendors and Device Vendors

Keynote 2

Speaker: David Almstrom

Qt Architecture : Cross platform

Qt Everywhere: STB, Mobile, HP Printer, Coffee maker and so on

Qt licenses

Commercial

LGPL v2.1

GPL v3

Code once -Deploy Everywhere using SDK

Qt for Mobile Devices

Symbian Devices

Meego Devices

Ovi services

Genivi Consortium

Meego IVI Distro

Qt 4.7

QtQuick

benchmark-driven development culture

quality

mobile development

Future

more quality

hardware acceleration

modularity

Market Feedback

hardware acceleration

Web integration

data from sensors

3D

touch data

Scene Graph Project

Project Lighthouse

New abstract layer for window systems

Qt in Use: Dynamic UI for CE Devices

Speaker: Masato Shimoi

Who is Netflix?

DVD and Blu-ray rent by mail

Streaming video has started since 3 years ago

2009, member 12 million / streaming user 6 million

2010, member 19 million / streaming user 11 million

New launch at 2010 Q3

PS3 embedded app

Google TV

Apple TV

IMO, UI innovations for Video service may increase

Innovation area

codec

DRM

protocol

security

UI Framework

NRDP SDK

Netflix ready device partner SDK

2008: 1.0: C++ based UI

2009: 2.0 Flash based UI

2010: 2.1/3.0/3.1 Dynamic UI (Flash or HTML5 based UI)

We recommend DHTML using Webkit

HTML5 momentum

HTML expertise is widely available

NRDP SDK contains Javascript Extensions for refine Webkit

Which distro of Webkit

Time to Market

Skill of Partners

Support

Developer community

We choose QtWebkit

Partners already know Qt technologies

Nokia local offices are widely existing

Selecting Qt 4.6.2

challenge to speed up animations

challenge to decrease RAM/flash footprint

Benefits

no need to wait for firmware updates

A/B testing for continuously improving UX

Qt in Use: UX Development with QML on MeeGo

Speaker: Hideto Kobayashi

Nomovok and Qt

#1 MeeGo ARM Integrator

using Qt since 2005

developing Qt technologies

using QML since as QtDeclarative

Why QML?

Smooth developing with little C++ knowledge

Same performances with traditional Qt development

Clean separation between UI and logic

ease to HW acceleration

UX is optimized for different form factors

Challenging points

There are no tools supporting QML completely still QtCreator 2.1 is released

Not so many examples and practices

OpenGL: problematic

Both l10n and i18n are not supported still QtSDK 4.7.1 is released

Coming future we hope

Qt lighthouse

less dependencies with X11

Qt widget toolkits

Qt Scene Graph

HW acceleration ready

QML can create yet another MeeGo UI

Meet Qt: Styling Qt Widgets

Speaker: Ryosuke Yamada

Increasing demands for applications

Improvement of expression

Improvement of operability

We develop custom widgets

Change appearance of original widgets

Need for learning both structures and drawings for widget

QWidget inherits both QObject and QPaintDevice

Each widgets inherit QWidget

QWidget has many virtual methods

Each widgets override these methods as necessary

paintEvent: method for drawing appearance

StyleOption Option for states of drawing

features

state

text

icon

We can set Qstyle for each widgets or whole application

GUI Emulation

Emulate appearance of distinct platforms inside Qt Framework

Subclass of QStyle is created for each platform

Drawing is calling primitive API of each platform

Some QStyle implementations depend on specific platform

If we want to create our own appearance, we implement the subclass of QStyle

Meet Qt: QtCreator

Speaker: Kenji Sugita

Past Qt GUI tools

Qt Designer

Qt Assistant

Qt Lingulst

Qt Creator

Code editor optimized for Qt development

Integrate with Qt Designer and Qt Assistant

qmake, Cmake

gdb / CDB

Quick Access a.k.a. locator

Integrate with VCS (like git)

Demo for tips of QtCreator

Qt SDK for Windows

Application created with Qt SDK is compiled with g++(in MinGW)

QtCreator itself and its libraries are compiled with VisualStudio

So any plug-ins created with Qt SDK are not adaptable for QtCreator on Windows

solutions

Create whole with VisualStudio

Bulld QtCreator from source with g++(in MinGW)

Meet Qt: QtQuick

Speaker: Takumi Asaki

Speaker: Tasuku Suzuki

What is QtQuick?

Qt User Interface Creation Kit

Framework for UI development

Easy to develop gorgeous UI

Easy to develop by who knows less knowledge of C++

Past development

Using C++ and Qt Designer

Problems

Qt Designer only deals with static layout

If we create gorgeous UI, we must code with C++

For instance） If we create Cover art UI

C++ : 1622 lines

QML : 150 lines

Components of QtQuick

Qt Declarative Module

Execution engine since Qt 4.7

usage as C++ API

QML

Qt Meta-Object Language

Declarative language for UI development

Syntax like CSS and JSON

QtCreator (2.1)

QML Editor

QML Designer

QML Debugger

QML syntax

tree structures

Declares, elements and properties

Demo for QML programming on QtCreator

There are no button elements

Scratch up mouse area, label and so forth as Button

Designer in QtCreator can develop creating State

Designer in QtCreator cannot develop transitions between states

Demo for developing data list

There are no compiling in development

Matters we still develop with Qt/C++

Table manipulation with SQL

Network access without HTTP

Qt/C++ can access QtQuick features

Of course, signals and slots

QML can access the instance in Qt/C++

Coming features of QtQuick

Scene Graph

QtQuick Components

Qt3D

Optimize the performance

Speaker: Tomonari Miyazaki

What is QTestLib

lightweight

highspeed

Test for GUI

benchmark

orders

initTestCase

init

each test functions

cleanup

cleanupTestCase

QT += testlib

Demo for QTestLib

Demo for QBENCHMARK of QTestLib

For Window, compile option '-ltcg' increases running speed(10~15%)

http://qt.gitorious.org/qt-labs/qtestlib-tools

Advanced Qt Programming Japanese Edition will be published in Summer, 2011.

Thursday, December 9, 2010

If you fail Install RMagick on MinGW and MSYS...

Labels: ImageMagick, mingw, Ruby

If you fail phosphorescence: Install RMagick on MinGW and MSYS, it may be the reason that convert command in extconf.rb file is overloaded with Windows File System's one. So edit the gems/rmagick-2.13.1/ext/RMagick/extconf.rb file at #171 and #178 like below:

`identify -version` =~ /Version: ImageMagick (\d+\.\d+\.\d+)-\d+ /

Then let's type the command in gems/rmagick-2.13.1 directory.

> gem build rmagick.gemspec
> gem install rmagick-2.13.1.gem --platform=ruby -- --with-opt-lib=c:/ImageMagick/6.6.6-Q16/lib --with-opt-include=c:/ImageMagick/6.6.6-Q16/include

And Now I'm requesting pulling it.

Monday, December 6, 2010

Ruby DevKit 4.5.1 has been released

Labels: mingw, Ruby

A few days ago, Ruby DevKit 4.5.1 has been released. (See also phosphorescence: Newest Ruby Devkit is released #1.)

If you never install older one, type these commands in DevKit directory:

> ruby dk.rb init
> ruby dk.rb install

If you already install older one, type these commands in DevKit directory:

> ruby dk.rb init
> ruby dk.rb install -f

Friday, December 3, 2010

Ruby's DateTime is treating "the Gregorian Conversion"

Labels: Ruby

In Western world, there is the Gregorian Conversion. Fortunately, Ruby's DateTime class is treating this.

irb(main):001:0> require 'date'
=> true
irb(main):002:0> dt1015 = DateTime.new(1582,10,15)
=> #<DateTime: 1582-10-15T00:00:00+00:00 (4598321/2,0,2299161)>
irb(main):003:0> dt1015 - 1
=> #<DateTime: 1582-10-04T00:00:00+00:00 (4598319/2,0,2299161)>
irb(main):004:0> dt1111 = DateTime.new(1582,11,11)
=> #<DateTime: 1582-11-11T00:00:00+00:00 (4598375/2,0,2299161)>
irb(main):005:0> dt1111 << 1
=> #<DateTime: 1582-10-04T00:00:00+00:00 (4598319/2,0,2299161)>