73 lines
1.9 KiB
Factor
73 lines
1.9 KiB
Factor
! Cairo "Hello World" demo
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! Copyright (c) 2007 Sampo Vuori
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! License: http://factorcode.org/license.txt
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!
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! This example is an adaptation of the following cairo sample code:
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! http://cairographics.org/samples/text/
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USING: cairo math math.constants byte-arrays kernel ui ui.render
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ui.gadgets opengl.gl ;
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IN: cairo-demo
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: make-image-array ( -- array )
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384 256 4 * * <byte-array> ;
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: convert-array-to-surface ( array -- cairo_surface_t )
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CAIRO_FORMAT_ARGB32 384 256 over 4 *
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cairo_image_surface_create_for_data ;
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TUPLE: cairo-gadget image-array cairo-t ;
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M: cairo-gadget draw-gadget* ( gadget -- )
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0 0 glRasterPos2i
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1.0 -1.0 glPixelZoom
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>r 384 256 GL_RGBA GL_UNSIGNED_BYTE r>
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cairo-gadget-image-array glDrawPixels ;
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: create-surface ( gadget -- cairo_surface_t )
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make-image-array dup >r swap set-cairo-gadget-image-array r> convert-array-to-surface ;
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: init-cairo ( gadget -- cairo_t )
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create-surface cairo_create ;
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M: cairo-gadget pref-dim* drop { 384 256 0 } ;
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: draw-hello-world ( gadget -- )
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cairo-gadget-cairo-t
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dup "Sans" CAIRO_FONT_SLANT_NORMAL CAIRO_FONT_WEIGHT_BOLD cairo_select_font_face
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dup 90.0 cairo_set_font_size
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dup 10.0 135.0 cairo_move_to
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dup "Hello" cairo_show_text
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dup 70.0 165.0 cairo_move_to
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dup "World" cairo_text_path
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dup 0.5 0.5 1 cairo_set_source_rgb
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dup cairo_fill_preserve
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dup 0 0 0 cairo_set_source_rgb
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dup 2.56 cairo_set_line_width
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dup cairo_stroke
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dup 1 0.2 0.2 0.6 cairo_set_source_rgba
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dup 10.0 135.0 5.12 0 pi 2 * cairo_arc
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dup cairo_close_path
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dup 70.0 165.0 5.12 0 pi 2 * cairo_arc
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cairo_fill ;
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M: cairo-gadget graft* ( gadget -- )
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dup dup init-cairo swap set-cairo-gadget-cairo-t draw-hello-world ;
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M: cairo-gadget ungraft* ( gadget -- )
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cairo-gadget-cairo-t cairo_destroy ;
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: <cairo-gadget> ( -- gadget )
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cairo-gadget construct-gadget ;
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: run ( -- )
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[
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<cairo-gadget> "Hello World from Factor!" open-window
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] with-ui ;
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MAIN: run
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