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//
// AggPas 2.4 RM3 Demo application
// Note: Press F1 key on run to see more info about this demo
//
// Paths: ..;..\ctrl;..\svg;..\util;..\platform\win;expat-wrap
//
program
rounded_rect ;
uses
agg_basics ,
agg_platform_support ,
agg_color ,
agg_pixfmt ,
agg_pixfmt_rgb ,
agg_ctrl ,
agg_slider_ctrl ,
agg_cbox_ctrl ,
agg_renderer_base ,
agg_renderer_scanline ,
agg_rasterizer_scanline_aa ,
agg_scanline_p ,
agg_render_scanlines ,
agg_gamma_functions ,
agg_gamma_lut ,
agg_ellipse ,
agg_rounded_rect ,
agg_conv_stroke ,
agg_vertex_source ;
{$I agg_mode.inc }
const
flip_y = true;
type
the_application = object(platform_support )
m_x ,
m_y : array[0..1 ] of double;
m_dx ,
m_dy : double;
m_idx : int;
m_radius ,
m_gamma ,
m_offset : slider_ctrl;
m_white_on_black : cbox_ctrl;
constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
destructor Destruct;
procedure on_draw; virtual;
procedure on_mouse_move (x ,y : int; flags : unsigned ); virtual;
procedure on_mouse_button_down(x ,y : int; flags : unsigned ); virtual;
procedure on_mouse_button_up (x ,y : int; flags : unsigned ); virtual;
procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
end;
{ CONSTRUCT }
constructor the_application.Construct;
var
rgba8 : aggclr;
begin
inherited Construct(format_ ,flip_y_ );
m_radius.Construct(10 ,10 ,600 - 10 ,19 ,not flip_y_ );
m_gamma.Construct (10 ,10 + 20 ,600 - 10 ,19 + 20 ,not flip_y_ );
m_offset.Construct(10 ,10 + 40 ,600 - 10 ,19 + 40 ,not flip_y_ );
m_white_on_black.Construct(10 ,10 + 60 ,'White on black' );
m_idx:=-1;
m_x[0 ]:=100; m_y[0 ]:=100;
m_x[1 ]:=500; m_y[1 ]:=350;
add_ctrl(@m_radius );
add_ctrl(@m_gamma );
add_ctrl(@m_offset );
add_ctrl(@m_white_on_black );
m_gamma.label_('gamma=%4.3f' );
m_gamma.range_(0.0 ,3.0 );
m_gamma.value_(1.8 );
m_radius.label_('radius=%4.3f' );
m_radius.range_(0.0 ,50.0 );
m_radius.value_(25.0 );
m_offset.label_('subpixel offset=%4.3f' );
m_offset.range_(-2.0 ,3.0 );
rgba8.ConstrInt(127 ,127 ,127 );
m_white_on_black.text_color_ (@rgba8 );
m_white_on_black.inactive_color_(@rgba8 );
end;
{ DESTRUCT }
destructor the_application.Destruct;
begin
inherited Destruct;
m_radius.Destruct;
m_gamma.Destruct;
m_offset.Destruct;
m_white_on_black.Destruct;
end;
{ ON_DRAW }
procedure the_application.on_draw;
var
pixf : pixel_formats;
rb : renderer_base;
ren : renderer_scanline_aa_solid;
ras : rasterizer_scanline_aa;
sl : scanline_p8;
rgba : aggclr;
gamma : gamma_lut;
gm_no : vertex_source;
e : ellipse;
r : agg_rounded_rect.rounded_rect;
p : conv_stroke;
d : double;
begin
// Initialize structures
gamma.Construct(m_gamma._value ,8 ,8 );
pixfmt_bgr24_gamma(pixf ,rbuf_window ,@gamma );
rb.Construct (@pixf );
ren.Construct(@rb );
if m_white_on_black._status then
rgba.ConstrDbl(0 ,0 ,0 )
else
rgba.ConstrDbl(1 ,1 ,1 );
rb.clear(@rgba );
ras.Construct;
sl.Construct;
// Render two "control" circles
e.Construct;
rgba.ConstrInt(127 ,127 ,127 );
ren.color_ (@rgba );
e.init (m_x[0 ] ,m_y[0 ] ,3 ,3 ,16 );
ras.add_path(@e );
render_scanlines(@ras ,@sl ,@ren );
e.init (m_x[1 ] ,m_y[1 ] ,3 ,3 ,16 );
ras.add_path(@e );
render_scanlines(@ras ,@sl ,@ren );
// Creating a rounded rectangle
d:=m_offset._value;
r.Construct(m_x[0 ] + d ,m_y[0 ] + d ,m_x[1 ] + d ,m_y[1 ] + d ,m_radius._value );
r.normalize_radius;
// Drawing as an outline
p.Construct(@r );
p.width_ (1.0 );
ras.add_path(@p );
if m_white_on_black._status then
rgba.ConstrDbl(1 ,1 ,1 )
else
rgba.ConstrDbl(0 ,0 ,0 );
ren.color_(@rgba );
render_scanlines(@ras ,@sl ,@ren );
gm_no.Construct;
ras.gamma(@gm_no );
// Render the controls
render_ctrl(@ras ,@sl ,@ren ,@m_radius );
render_ctrl(@ras ,@sl ,@ren ,@m_gamma );
render_ctrl(@ras ,@sl ,@ren ,@m_offset );
render_ctrl(@ras ,@sl ,@ren ,@m_white_on_black );
// Free AGG resources
ras.Destruct;
sl.Destruct;
gamma.Destruct;
p.Destruct;
end;
{ ON_MOUSE_MOVE }
procedure the_application.on_mouse_move;
begin
if flags and mouse_left <> 0 then
if m_idx >= 0 then
begin
m_x[m_idx ]:=x - m_dx;
m_y[m_idx ]:=y - m_dy;
force_redraw;
end
else
else
on_mouse_button_up(x ,y ,flags );
end;
{ ON_MOUSE_BUTTON_DOWN }
procedure the_application.on_mouse_button_down;
var
i : unsigned;
begin
if flags and mouse_left <> 0 then
for i:=0 to 1 do
if Sqrt((x - m_x[i ] ) * (x - m_x[i ] ) + (y - m_y[i ] ) * (y - m_y[i ] ) ) < 5.0 then
begin
m_dx :=x - m_x[i ];
m_dy :=y - m_y[i ];
m_idx:=i;
break;
end;
end;
{ ON_MOUSE_BUTTON_UP }
procedure the_application.on_mouse_button_up;
begin
m_idx:=-1;
end;
{ ON_KEY }
procedure the_application.on_key;
begin
if key = key_f1 then
message_(
'Yet another example dedicated to Gamma Correction. If you have a CRT monitor: '#13 +
'The rectangle looks bad - the rounded corners are thicker than its side lines. '#13 +
'First try to drag the "subpixel offset" control — it simply adds some fractional '#13 +
'value to the coordinates. When dragging you will see that the rectangle is'#13 +
'"blinking". Then increase "Gamma" to about 1.5. The result will look almost '#13 +
'perfect — the visual thickness of the rectangle remains the same. That''s good, '#13 +
'but turn the checkbox "White on black" on — what do we see ? Our rounded '#13 +
'rectangle looks terrible. Drag the "subpixel offset" slider — it''s blinking as hell. '#13 +
'Now decrease "Gamma" to about 0.6. What do we see now ? Perfect result ! '#13 +
'If you use an LCD monitor, the good value of gamma will be closer to 1.0 in both '#13 +
'cases — black on white or white on black. There''s no perfection in this world, but '#13 +
'at least you can control Gamma in Anti-Grain Geometry :-)' +
#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. Rounded rectangle with gamma-correction & stuff (F1-Help)' );
if app.init(600 ,400 ,window_resize ) then
app.run;
app.Destruct;
END.
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