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The cairo bindings follows the C API pretty closely.
Naming
======
The module name is called 'cairo' and usually imported into
the namespace as 'Cairo'.
gjs> const Cairo = imports.cairo;
Methods are studlyCaps, similar to other JavaScript apis, eg
cairo_move_to is wrapped to Cairo.Context.moveTo()
cairo_surface_write_to_png to Cairo.Context.writeToPNG().
Abbrevations such as RGB, RGBA, PNG, PDF, SVG are always
upper-case.
Enums are set in the cairo namespace, the enum names are capitalized:
CAIRO_FORMAT_ARGB32 is mapped to Cairo.Format.ARGB32 etc.
Surfaces (cairo_surface_t)
==========================
Prototype hierarchya
* Surface (abstract)
* ImageSurface
* PDFSurface
* SVGSurface
* PostScriptSurface
The native surfaces (win32, quartz, xlib) are not supported at this point.
Methods manipulating a surface are present in the surface class.
Creating an ImageSurface from a PNG is done by calling a static method:
gjs> let surface = Cairo.ImageSurface.createFromPNG("filename.png");
Context (cairo_t)
=================
cairo_t is mapped as Cairo.Context.
You will either get a context from a third-party library such
as Clutter/Gtk/Poppler or by calling the cairo.Context constructor.
gjs> let cr = new Cairo.Context(surface);
gjs> let cr = Gdk.cairo_create(...);
All introspection methods taking or returning a cairo_t will automatically
create a Cairo.Context.
Patterns (cairo_pattern_t)
==========================
Prototype hierarchy
* Pattern
* Gradient
* LinearGradient
* RadialGradient
* SurfacePattern
* SolidPattern
You can create a linear gradient by calling the constructor:
Constructors:
gjs> let pattern = new Cairo.LinearGradient(0, 0, 100, 100);
gjs> let pattern = new Cairo.RadialGradient(0, 0, 10, 100, 100, 10);
gjs> let pattern = new Cairo.SurfacePattern(surface);
gjs> let pattern = new Cairo.SolidPattern.createRGB(0, 0, 0);
gjs> let pattern = new Cairo.SolidPattern.createRGBA(0, 0, 0, 0);
TODO:
* context: wrap the remaning methods
* surface methods
* image surface methods
* matrix
* version
* iterating over cairo_path_t
Fonts & Glyphs are not wrapped, use PangoCairo instead.
* glyphs
* text cluster
* font face
* scaled font
* font options
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