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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
component_rendering ;
uses
agg_basics ,
agg_platform_support ,
agg_slider_ctrl ,
agg_color ,
agg_pixfmt ,
agg_pixfmt_gray ,
agg_pixfmt_rgb ,
agg_renderer_base ,
agg_renderer_scanline ,
agg_rasterizer_scanline_aa ,
agg_scanline_p ,
agg_render_scanlines ,
agg_ctrl ,
agg_ellipse ;
{$I agg_mode.inc }
const
flip_y = true;
type
the_application = object(platform_support )
m_alpha : slider_ctrl_ptr;
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 the_application.Construct;
begin
inherited Construct(format_ ,flip_y_ );
new(m_alpha ,Construct(5 ,5 ,320 - 5 ,10 + 5 ,not flip_y ) );
m_alpha.label_('Alpha=%1.0f' );
m_alpha.range_(0 ,255 );
m_alpha.value_(255 );
add_ctrl(m_alpha );
end;
{ DESTRUCT }
destructor the_application.Destruct;
begin
inherited Destruct;
dispose(m_alpha ,Destruct );
end;
{ ON_DRAW }
procedure the_application.on_draw;
var
pf ,
pfr ,
pfg ,
pfb : pixel_formats;
rbase ,
rbr ,
rbg ,
rbb : renderer_base;
r ,
rr ,
rg ,
rb : renderer_scanline_aa_solid;
ras : rasterizer_scanline_aa;
sl : scanline_p8;
rgba ,
gray : aggclr;
er ,
eg ,
eb : ellipse;
begin
// Initialize structures
pixfmt_bgr24 (pf ,rbuf_window );
pixfmt_gray8_bgr24r(pfr ,rbuf_window );
pixfmt_gray8_bgr24g(pfg ,rbuf_window );
pixfmt_gray8_bgr24b(pfb ,rbuf_window );
rbase.Construct(@pf );
rbr.Construct (@pfr );
rbg.Construct (@pfg );
rbb.Construct (@pfb );
r.Construct (@rbase );
rr.Construct(@rbr );
rg.Construct(@rbg );
rb.Construct(@rbb );
ras.Construct;
sl.Construct;
// Setup colors & background
rgba.ConstrDbl(1 ,1 ,1 );
gray.ConstrInt(0 ,trunc(m_alpha._value ) );
rbase.clear(@rgba );
// Draw ellipses
er.Construct (_width / 2 - 0.87 * 50 ,_height / 2 - 0.5 * 50 ,100 ,100 ,100 );
rr.color_ (@gray );
ras.add_path (@er );
render_scanlines(@ras ,@sl ,@rr );
eg.Construct (_width / 2 + 0.87 * 50 ,_height / 2 - 0.5 * 50 ,100 ,100 ,100 );
rg.color_ (@gray );
ras.add_path (@eg);
render_scanlines(@ras ,@sl ,@rg );
eb.Construct (_width / 2 ,_height / 2 + 50 ,100 ,100 ,100 );
rb.color_ (@gray );
ras.add_path (@eb );
render_scanlines(@ras ,@sl ,@rb );
// Render control
render_ctrl(@ras ,@sl ,@r ,m_alpha );
// Free AGG resources
ras.Destruct;
sl.Destruct;
end;
{ ON_KEY }
procedure the_application.on_key;
begin
if key = key_f1 then
message_(
'AGG has a gray-scale renderer that can use any 8-bit color channel '#13 +
'of an RGB or RGBA frame buffer. Most likely it will be used to draw '#13 +
'gray-scale images directly in the alpha-channel.' +
#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. Component Rendering (F1-Help)' );
if app.init(320 ,320 ,0 ) then
app.run;
app.Destruct;
END.
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