Qt toolkit

Algebraic Functions (Mathematics)

Dalam pemrograman komputer, Qt adalah toolkit untuk pengembangan aplikasi grafis yang bersifat lintas-platform. Qt dikenal sebagai fondasi penyusun KDE, sebuah lingkungan grafis yang populer di Linux. Qt dibuat oleh perusahaan Norwegia bernama Trolltech. Mengikut pengembang-pengembang Qt di Trolltech, Qt diucapkan seperti kata bahasa Inggris "cute".

Qt disusun dengan bahasa C++ dan dapat digunakan di platform Unix, Windows, dan Mac OS X. Qt menyediakan dukungan terhadap internasionalisasi, akses ke basis data, XML, dan penanganan berkas.

Qt dirilis oleh Trolltech untuk tiga platforms:

Qt/X11 — Qt untuk X Window System
Qt/Mac — Qt untuk Apple Mac OS X
Qt/Windows — Qt untuk Microsoft Windows

Terdapat empat edisi Qt untuk masing-masing platform, yakni:

Qt Console — edisi untuk aplikasi non-GUI.
Qt Desktop Light — edisi minimum GUI, tidak mendukung fungsi-fungsi jaringan dan basis data.
Qt Desktop — edisi lengkap.
Qt Open Source Edition — edisi lengkap yang bersifat open-source.

Tiga edisi yang pertama adalah proprietary dan dirilis dengan lisensi komersil. Edisi open-source dirilis dengan lisensi GPL, dengan demikian aplikasi yang dibuat dengan edisi ini harus menggunakan lisensi GPL atau lisensi lain yang kompatibel. Semua edisi dapat digunakan dengan kompilator GNU C++. Edisi komersil untuk Windows juga mendukung Microsoft Visual Studio.

Versi terbaru Qt adalah Qt 4 yang dirilis pada tanggal 28 Juni, 2005.

[sunting] Lisensi

Trolltech menggunakan skema dual-license untuk Qt, yaitu lisensi GPL dan lisensi komersil.

Qt dengan lisensi GPL hanya dapat digunakan untuk mengembangkan aplikasi open-source yang dirilis dengan lisensi GPL atau yang kompatibel. Contoh penggunaan Qt GPL yang paling umum adalah KDE, lingkungan grafis yang populer di Linux.

Untuk mengembangkan aplikasi yang bukan open-source, dibutuhkan lisensi komersil dari Trolltech [1].

[sunting] Perkembangan Qt

Haavard Nord dan Eirik Chambe-Eng (pengembang awal Qt, sekarang menjabat sebagai CEO dan President Trolltech) memulai pengembangan "Qt" pada tahun 1991, tiga tahun sebelum membentuk perusahaan yang bernama Quasar Technologies yang kemudian berganti nama dua kali, Troll Tech dan akhirnya Trolltech.

Toolkit tersebut dinamakan Qt karena aksara Q terlihat cantik karena font Emacs yang digunakan Haavard, sedangkan huruf diilhami dari Xt (X toolkit).

Kontroversi merebak pada tahun 1998 tatkala KDE semakin meluas penggunaannya sebagai lingkungan grafis untuk sistem operasi Linux. Karena KDE menggunakan Qt/X11 sebagai fondasinya, banyak pihak dari kubu gerakan open source dan free software movements menjadi khawatir bahwa nantinya bagian penting dari sistem operasi ini akan berada di bawah kendali komersil.

Trolltech kemudian menggunakan Q Public License (QPL) sebagai lisensi. QPL memenuhi kaidah lisensi free software tetapi oleh FSF dianggap tidak kompatible dengan GPL. Sebuah langkah kompromis diambil oleh tim KDE dan Trolltech dengan KDE Free Qt Foundation yang akan menjamin bahwa jika Trolltech menghentikan pengembangan Qt/X11, maka versi terakhir dari Qt/X11 akan dirilis menggunakan lisensi BSD (yang lebih tidak mengikat dibandingkan GPL).

Pada bulan September 2000, Trolltech merilis Qt/X11 2.2 dengan lisensi GPL. Versi-versi Qt/X11 selanjutnya juga menggunakan lisensi ini.

Sejak Juni 2005, Trolltech juga merilis Qt/Windows 4 dengan lisensi GPL.

Tentang pengaya ini

The primary goal of this extension is to provide the tools needed to install and manage extensions and themes locally.

To do this the extension provides multi-extension installation support, hacking capabilities to the Extension/Theme manager windows, features to find and troubleshoot Extensions/Themes Build, GUID and Profile information.

Note: With Toolkit 6.0 Auto Archiving is fully working in Firefox 2.0 and temporarily disabled for Firefox 3.0, fix coming soon.

ENGLISH VERSION

This mathematical graph generator gives students immediate feedback in visually determining slope and intercepts based upon functions using four places (x³, x², x and x⁰). By zooming in or out at the bottom of the screen, the unit values can be varied from 0.125 to 32 in a total of 9 logarithmic increments.

In the left example, lines can be created by setting the x³ and x² to 0. Parabolic curves (at right) can be created by giving a value to x², and in the simplest examples, having 0 for x¹ and x⁰.

A teacher can pick up a stylus and write over the Algebraic Functions Gallery item. In this case, the teacher is explaining how to calculate slope, and forecasts changing the slope to 0. The point is finished with the teacher changing the “C-value” (x⁰) to 0, and the students immediately see the blue line interactively change.

Hyperbola is a similar Gallery object.

Parabolic Functions is a similar Gallery object

Slope of a Line is a similar Gallery object.

Trigonometric Functions is a similar Gallery object.

Calendar Generator (Administration and Evaluation)

Use the pull down menus to enter the month and year (as shown on left). Click the Generate Calendar button to generate the calendar for that month (shown on right). Click on the yellow “Inject” arrow to inject the calendar into a SMART Notebook page.

Then, close the Calendar Generator to work on the new calendar you created in Notebook software.

Compass (Mathematics)

Here the Compass and Ruler are being used together to draw two concentric circles. Note the arc degree is displayed on the top of the compass.

Tehe Compass is not intuitive to use. First, drag the compass out of the Gallery. Position it by clicking on the lower left spot on the straight leg, to pick it up and drag it to the center point (left figure). Then, click yellow circle on the drawing leg to create the radius distance (center and right figures). Pick up a stylus from the SMART Board pen tray to change colors. Point on the compass pen and rotate it in a circular fashion to create the compass circl.

In this example, the X-Y Grid was dragged onto the Notebook page from the Gallery, then the Compass was positioned at -2,1 and a circle was drawn with a radius of 3.

Dice-Vowels and Dice-Consonants (English and Language Arts)

Pull letter dice from the Gallery and position them on SMART Notebook page. Click on each dice to start spinning. Once the dice stop, pick up a stylus to write words which include these letters.

Hundred Square (Mathematics)

Hundred Square helps students see patterns when learning multiplication. In this more complex example, we picked up the blue pen and entered “3” in the “Display multiples of” box, pressed return on the keyboard, and all the multiples of 3 were displayed in blue. We then picked up the red pen, entered 2 as the multiple, and displayed all multiples of 2.

We then picked up the green pen and clicked twice on each multiple of 6 (it was red, because it was a multiple of 2) to turn it green. We could teach the class that the digits added together equals a multiple of 3 (e.g. 48 is a multiple of 3, because 4+8=12, which is a multiple of 3), or we could more simply divide each colored multiple by 3 or by 6.

This more complex example introduces the concept of factoring to students. Using this Flash-based Hundred Squares aids a teacher to quickly discuss multiplication, division and factoring concepts.

Mathematical Toolkit (Mathematics)

Skoool’s Mathematical Toolkit has three sections: 2D Shape Creation (shown above), Charting and Coordinates and Graphing. First, you determine the grid units, minimum and maximum values, and then create eight different 2D shapes (quad, circle, triangle, line, arc, ray, segment and vector) with the appropriate X,Y points. Here you see two 30 unit radius circles, with centers 10 units offset.

The Charting area lets you chart up to two variables, in this case, list 1 is the number of cousins and list 2 is the number of siblings for each student.

You can quickly generate different charts, including bar, pie, box and whisker, and scattergram.

These charts are very quickly created. Here is a bar chart for the number of cousins (list 2).

You determine the scale and minimum/maximum points of the grids.

Here is the box and whisker diagram, with legends. Although there is a tab for loading data, we were unable to load coordinate data from Excel, tab or comma delimited files.

In the Coordinates and Graphing section, we tried to bring in a Gallery object, but had difficulty in accurately selecting points. Loading images didn’t work either.

Spinner and Navigation buttons (green)

(Administration and Evaluation)

Create a Notebook file with the “previous page” and “next page” navigation buttons. Add text that is center justified. Copy the pages and then add your text. This Notebook file explains how the Spinner works.

Click on the double chevron to open up the spinner, choose the number of segments you want. Click on each segment, then enter the text, change the font size, choose the color of the segment fill color and text color. Once you have customized each segment, click the Save button. To reuse your customized spinner, create a My Content folder, drag you custom spinner into it and rename it as desired.