Dia — свободный кроссплатформенный редактор диаграмм, часть GNOME Office, но может быть установлен независимо. Он может быть использован для создания различных видов диаграмм: блок-схем алгоритмов программ, древовидных схем, статических структур UML, баз данных, диаграмм сущность-связь, радиоэлектронных элементов, потоковых диаграмм, сетевых диаграмм и других.
Dia расширяема новыми наборами объектов, которые описываются с помощью файлов в формате, основанном на XML.
Wikipedia:How to draw a diagram with Dia
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Dia is a GTK+ based, Open Source cross-platform diagramming program. It is very powerful, easy to use, and free of charge.
To begin using Dia, you first need to download the program and install it.
If you are using Microsoft Windows you can download the windows installer here.
If you are using Linux, you download it from the repository that you normally use and install it as you install other software.
After the program is installed you can start it by clicking on the Dia shortcut under the Start menu in Windows, or, in Linux, as you start other programs.
Dia is very powerful, but simple to use. Below are many of the tools that you can use to manipulate objects in your drawing.
Starting on the left you will find a handful of simple tools.
Use the pointer button to move objects on the screen.
Use the cursor button to change the text of a text object.
Use the magnify button to zoom in.
Use the button with four arrows to move around the diagram.
Use the text button to add text to your diagram.
The next 9 buttons are used to add shapes and lines to the diagram. Experiment with them: they are pretty much self explanatory.
Below is a drop down list that allows you to choose from several groups of special objects that can be used in your diagram.
To the right there is a grid where you will add objects. Objects can be resized, moved, deleted, copied, and pasted. Many objects also have special properties. Double-clicking the object will allow you to change various properties like color, width, and font.
Dia is easy to use, powerful, and free. It's capable of doing many of the same things that Microsoft Visio can do but without charge and on a wider range of computers.
This tutorial aims to instruct a beginner on the basic principles of vector graphics, using Dia.