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//
// AggPas 2.4 RM3 Demo application
// Note: Press F1 key on run to see more info about this demo
//
// Paths: src;src\ctrl;src\svg;src\util;src\platform\win;expat-wrap
//
program
raster_text ;
uses
agg_basics ,
agg_platform_support ,
agg_color ,
agg_pixfmt ,
agg_pixfmt_rgb ,
agg_rendering_buffer ,
agg_renderer_base ,
agg_renderer_scanline ,
agg_rasterizer_scanline_aa ,
agg_scanline_u ,
agg_render_scanlines ,
agg_span_allocator ,
agg_span_gradient ,
agg_span_interpolator_linear ,
agg_embedded_raster_fonts ,
agg_glyph_raster_bin ,
agg_renderer_raster_text ,
agg_trans_affine ;
{$I agg_mode.inc }
const
flip_y = true;
type
gradient_sine_repeat_adaptor = object(gradient )
m_gradient : gradient_ptr;
m_periods : double;
constructor Construct(GF : gradient_ptr );
procedure _periods(p : double );
function calculate(x ,y ,d : int ) : int; virtual;
end;
the_application = object(platform_support )
constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
destructor Destruct;
procedure on_draw; virtual;
procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
end;
{ CONSTRUCT }
constructor gradient_sine_repeat_adaptor.Construct;
begin
m_gradient:=GF;
m_periods :=pi* 2.0;
end;
{ _PERIODS }
procedure gradient_sine_repeat_adaptor._periods;
begin
m_periods:=p * pi * 2.0;
end;
{ CALCULATE }
function gradient_sine_repeat_adaptor.calculate;
begin
result:=trunc((1.0 + Sin(m_gradient.calculate(x ,y ,d ) * m_periods / d ) ) * d / 2 );
end;
{ CONSTRUCT }
constructor the_application.Construct;
begin
inherited Construct(format_ ,flip_y_ );
end;
{ DESTRUCT }
destructor the_application.Destruct;
begin
inherited Destruct;
end;
{ ON_DRAW }
procedure the_application.on_draw;
type
font_type = record
font : int8u_ptr;
name : PChar;
end;
const
fonts : array[0..34 ] of font_type = (
(font:@gse4x6; name:'gse4x6' ) ,
(font:@gse4x8; name:'gse4x8' ) ,
(font:@gse5x7; name:'gse5x7' ) ,
(font:@gse5x9; name:'gse5x9' ) ,
(font:@gse6x9; name:'gse6x9' ) ,
(font:@gse6x12; name:'gse6x12' ) ,
(font:@gse7x11; name:'gse7x11' ) ,
(font:@gse7x11_bold; name:'gse7x11_bold' ) ,
(font:@gse7x15; name:'gse7x15' ) ,
(font:@gse7x15_bold; name:'gse7x15_bold' ) ,
(font:@gse8x16; name:'gse8x16' ) ,
(font:@gse8x16_bold; name:'gse8x16_bold' ) ,
(font:@mcs11_prop; name:'mcs11_prop' ) ,
(font:@mcs11_prop_condensed; name:'mcs11_prop_condensed' ) ,
(font:@mcs12_prop; name:'mcs12_prop' ) ,
(font:@mcs13_prop; name:'mcs13_prop' ) ,
(font:@mcs5x10_mono; name:'mcs5x10_mono' ) ,
(font:@mcs5x11_mono; name:'mcs5x11_mono' ) ,
(font:@mcs6x10_mono; name:'mcs6x10_mono' ) ,
(font:@mcs6x11_mono; name:'mcs6x11_mono' ) ,
(font:@mcs7x12_mono_high; name:'mcs7x12_mono_high' ) ,
(font:@mcs7x12_mono_low; name:'mcs7x12_mono_low' ) ,
(font:@verdana12; name:'verdana12' ) ,
(font:@verdana12_bold; name:'verdana12_bold' ) ,
(font:@verdana13; name:'verdana13' ) ,
(font:@verdana13_bold; name:'verdana13_bold' ) ,
(font:@verdana14; name:'verdana14' ) ,
(font:@verdana14_bold; name:'verdana14_bold' ) ,
(font:@verdana16; name:'verdana16' ) ,
(font:@verdana16_bold; name:'verdana16_bold' ) ,
(font:@verdana17; name:'verdana17' ) ,
(font:@verdana17_bold; name:'verdana17_bold' ) ,
(font:@verdana18; name:'verdana18' ) ,
(font:@verdana18_bold; name:'verdana18_bold' ) ,
(font:NIL; name:NIL ) );
var
pixf : pixel_formats;
rgba ,
rgbb : aggclr;
rb : renderer_base;
rt : renderer_raster_htext_solid;
glyph : glyph_raster_bin;
i : int;
y : double;
buf : string[100 ];
mtx : trans_affine;
grad_circ : gradient_circle;
grad_func : gradient_sine_repeat_adaptor;
color_func : gradient_linear_color;
inter : span_interpolator_linear;
sa : span_allocator;
sg : span_gradient;
ren : renderer_scanline_aa;
rt2 : renderer_raster_htext;
begin
// Initialize structures
glyph.Construct(NIL );
pixfmt_bgr24(pixf ,rbuf_window );
rb.Construct(@pixf );
rgba.ConstrDbl(1 ,1 ,1 );
rb.clear (@rgba );
rt.Construct(@rb ,@glyph );
y:=5;
rgba.ConstrDbl(0 ,0 ,0 );
rt.color_ (@rgba );
// Render all raster fonts
i:=0;
while fonts[i ].font <> NIL do
begin
buf:='A quick brown fox jumps over the lazy dog 0123456789: ' + fonts[i ].name + #0;
glyph.font_ (fonts[i ].font );
rt.render_text(5 ,y ,@buf[1 ] ,not flip_y );
y:=y + glyph.height + 1;
inc(i );
end;
// Render gradient font
grad_circ.Construct;
grad_func.Construct(@grad_circ );
grad_func._periods (5 );
rgba.ConstrDbl (1.0 ,0 ,0 );
rgbb.ConstrDbl (0 ,0.5 ,0 );
color_func.Construct(@rgba ,@rgbb );
mtx.Construct;
inter.Construct(@mtx );
sa.Construct;
sg.Construct (@sa ,@inter ,@grad_func ,@color_func ,0 ,150.0 );
ren.Construct(@rb ,@sg );
rt2.Construct(@ren ,@glyph );
rt2.render_text(5 ,465 ,'RADIAL REPEATING GRADIENT: A quick brown fox jumps over the lazy dog' ,not flip_y );
// Free AGG resources
sa.Destruct;
end;
{ ON_KEY }
procedure the_application.on_key;
begin
if key = key_f1 then
message_(
'Classes that render raster text was added in AGG mostly to prove the concept of '#13 +
'the design. They can be used to draw simple (aliased) raster text. The example '#13 +
'demonstrates how to use text as a custom scanline generator together with any '#13 +
'span generator (in this example it''s gradient filling). The font format is '#13 +
'propriatory, but there are some predefined fonts that are shown in the example.'#13#13 +
'How to play with:'#13#13 +
'Change the renderer "rt" to "renderer_raster_vtext_solid" in the source code'#13 +
'and recompile it, to get the vertical raster font orientation.' +
#13#13'Note: F2 key saves current "screenshot" file in this demo''s directory. ' );
end;
VAR
app : the_application;
BEGIN
app.Construct(pix_format_bgr24 ,flip_y );
app.caption_ ('AGG Example. Raster Text (F1-Help)' );
if app.init(640 ,480 ,window_resize ) then
app.run;
app.Destruct;
END.
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