Cairo-Tutorial

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Cairo二维图形库使用实例及教程

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From: <http://zetcode.com/gfx/cairo/>

##The Cairo graphics library

Welcome to the Cairo graphics tutorial. This tutorial will teach you basics 
and some advanced topics of the Cairo 2D vector drawing library. In most 
examples we will use the GTK+ programming library. This tutorial is done in
C programming language.

###2D Vector Graphics

There are two different computer graphics. Vector and raster graphics. Raster
graphics represents images as a collection of pixels. Vector graphics is the
use of geometrical primitives such as points, lines, curves or polygons to
represent images. These primitives are created using mathematical equations.

Both types of computer graphics have advantages and disadvantages. The
advantages of vector graphics over raster are:

+ smaller size
+ ability to zoom indefinitely
+ moving, scaling, filling or rotating does not degrade the quality of an image

###Cairo

Cairo is a library for creating 2D vector graphics. It is written in the C
programming language. Bindings for other computer languages exist. Python, Perl,
C++, C#, Java. Cairo is a multiplatform library, works on Linux, BSDs, OSX.

Cairo supports various backends.

+ X Window System
+ Win32 GDI
+ Mac OS X Quartz
+ PNG
+ PDF
+ PostScript
+ SVG

This means, we can use the library to draw on windows on Linux/BSDs, Windows,
OSX and we can use the library to create PNG images, PDF files, PostScript
files and SVG files.

We can compare the cairo library to the GDI+ library on Windows OS and the 
Quartz 2D on Mac OS. Cairo is an open source software library. From version
2\.8, the  cairo library is part of the GTK+ system.

###Compiling examples

The examples are created in the C programming language. We use GNU C compiler
to compile them.

gcc example.c -o example `pkg-config --cflags --libs gtk+-3.0`

Note that the order of compiling options is important.

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