1 ! Cairo "Hello World" demo
2 ! Copyright (c) 2007 Sampo Vuori
3 ! License: http://factorcode.org/license.txt
5 ! This example is an adaptation of the following cairo sample code:
6 ! http://cairographics.org/samples/text/
9 USING: cairo.ffi math math.constants byte-arrays kernel ui
10 ui.render combinators ui.gadgets opengl.gl accessors
15 : make-image-array ( -- array )
16 384 256 4 * * <byte-array> ;
18 : convert-array-to-surface ( array -- cairo_surface_t )
19 CAIRO_FORMAT_ARGB32 384 256 over 4 *
20 cairo_image_surface_create_for_data ;
22 TUPLE: cairo-demo-gadget < gadget image-array cairo-t ;
24 M: cairo-demo-gadget draw-gadget* ( gadget -- )
28 [ 384 256 GL_RGBA GL_UNSIGNED_BYTE ] dip
29 image-array>> glDrawPixels
32 : create-surface ( gadget -- cairo_surface_t )
33 make-image-array [ swap (>>image-array) ] keep
34 convert-array-to-surface ;
36 : init-cairo ( gadget -- cairo_t )
37 create-surface cairo_create ;
39 M: cairo-demo-gadget pref-dim* drop { 384 256 } ;
45 : draw-hello-world ( gadget -- )
46 cairo-t>> [ no-cairo-t ] unless*
49 "Sans" CAIRO_FONT_SLANT_NORMAL CAIRO_FONT_WEIGHT_BOLD
50 cairo_select_font_face
52 [ 90.0 cairo_set_font_size ]
53 [ 10.0 135.0 cairo_move_to ]
54 [ "Hello" cairo_show_text ]
55 [ 70.0 165.0 cairo_move_to ]
56 [ "World" cairo_text_path ]
57 [ 0.5 0.5 1 cairo_set_source_rgb ]
58 [ cairo_fill_preserve ]
59 [ 0 0 0 cairo_set_source_rgb ]
60 [ 2.56 cairo_set_line_width ]
62 [ 1 0.2 0.2 0.6 cairo_set_source_rgba ]
63 [ 10.0 135.0 5.12 0 pi 2 * cairo_arc ]
65 [ 70.0 165.0 5.12 0 pi 2 * cairo_arc ]
71 M: cairo-demo-gadget graft* ( gadget -- )
72 dup dup init-cairo swap (>>cairo-t) draw-hello-world ;
74 M: cairo-demo-gadget ungraft* ( gadget -- )
75 cairo-t>> cairo_destroy ;
77 : <cairo-demo-gadget> ( -- gadget )
78 cairo-demo-gadget new-gadget ;
82 <cairo-demo-gadget> "Hello World from Factor!" open-window