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Version:
1.6 ▾
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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
scanline_boolean2 ;
uses
SysUtils ,
agg_basics ,
agg_platform_support ,
agg_color ,
agg_pixfmt ,
agg_pixfmt_rgb ,
agg_ctrl ,
agg_slider_ctrl ,
agg_cbox_ctrl ,
agg_rbox_ctrl ,
agg_rendering_buffer ,
agg_renderer_base ,
agg_renderer_scanline ,
agg_renderer_primitives ,
agg_rasterizer_scanline_aa ,
agg_scanline ,
agg_scanline_u ,
agg_scanline_p ,
agg_scanline_bin ,
agg_scanline_storage_aa ,
agg_scanline_storage_bin ,
agg_scanline_boolean_algebra ,
agg_render_scanlines ,
agg_math_stroke ,
agg_path_storage ,
agg_span_solid ,
agg_conv_curve ,
agg_conv_stroke ,
agg_conv_transform ,
agg_gsv_text ,
agg_trans_affine ,
agg_vertex_source ,
make_gb_poly_ ,
make_arrows_ ;
{$I agg_mode.inc }
const
flip_y = true;
type
spiral = object(vertex_source )
m_x ,
m_y ,
m_r1 ,
m_r2 ,
m_step ,
m_start_angle ,
m_angle ,
m_curr_r ,
m_da ,
m_dr : double;
m_start : boolean;
constructor Construct(x ,y ,r1 ,r2 ,step : double; start_angle : double = 0 );
procedure rewind(path_id : unsigned ); virtual;
function vertex(x ,y : double_ptr ) : unsigned; virtual;
end;
the_application = object(platform_support )
m_polygons ,
m_fill_rule ,
m_scanline_type ,
m_operation : rbox_ctrl;
m_x ,
m_y : double;
constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
destructor Destruct;
procedure render_scanline_boolean(ras1 ,ras2 : rasterizer_scanline_ptr );
function render_sbool (ras1 ,ras2 : rasterizer_scanline_ptr ) : unsigned;
procedure on_init; virtual;
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_key(x ,y : int; key ,flags : unsigned ); virtual;
end;
{ CONSTRUCT }
constructor spiral.Construct;
begin
m_x :=x;
m_y :=y;
m_r1:=r1;
m_r2:=r2;
m_step :=step;
m_start_angle:=start_angle;
m_angle :=start_angle;
m_da:=deg2rad(4.0 );
m_dr:=m_step / 90.0;
end;
{ REWIND }
procedure spiral.rewind;
begin
m_angle :=m_start_angle;
m_curr_r:=m_r1;
m_start :=true;
end;
{ VERTEX }
function spiral.vertex;
begin
if m_curr_r > m_r2 then
begin
result:=path_cmd_stop;
exit;
end;
x^:=m_x + Cos(m_angle ) * m_curr_r;
y^:=m_y + Sin(m_angle ) * m_curr_r;
m_curr_r:=m_curr_r + m_dr;
m_angle :=m_angle + m_da;
if m_start then
begin
m_start:=false;
result:=path_cmd_move_to;
end
else
result:=path_cmd_line_to;
end;
{ COUNT_SPANS }
function count_spans(ras : rasterizer_scanline_ptr; sl : scanline_ptr ) : unsigned;
var
n : unsigned;
begin
n:=0;
if ras.rewind_scanlines then
begin
sl.reset(ras._min_x ,ras._max_x );
if sl.is_embedded then
while ras.sweep_scanline_em(sl ) do
inc(n ,sl.num_spans )
else
while ras.sweep_scanline(sl ) do
inc(n ,sl.num_spans );
end;
result:=n;
end;
{ CONSTRUCT }
constructor the_application.Construct;
begin
inherited Construct(format_ ,flip_y_ );
m_polygons.Construct (5.0 ,5.0 ,5.0 + 205.0 ,110.0 ,not flip_y_ );
m_fill_rule.Construct (200 ,5.0 ,200 + 105.0 ,50.0 ,not flip_y_ );
m_scanline_type.Construct(300 ,5.0 ,300 + 115.0 ,70.0 ,not flip_y_ );
m_operation.Construct (535.0 ,5.0 ,535.0 + 115.0 ,145.0 ,not flip_y_ );
m_operation.add_item ('None' );
m_operation.add_item ('OR' );
m_operation.add_item ('AND' );
m_operation.add_item ('XOR Linear' );
m_operation.add_item ('XOR Saddle' );
m_operation.add_item ('A-B' );
m_operation.add_item ('B-A' );
m_operation.cur_item_(2 );
add_ctrl(@m_operation );
m_operation.no_transform;
m_fill_rule.add_item ('Even-Odd' );
m_fill_rule.add_item ('Non Zero' );
m_fill_rule.cur_item_(1 );
add_ctrl(@m_fill_rule );
m_fill_rule.no_transform;
m_scanline_type.add_item ('scanline_p' );
m_scanline_type.add_item ('scanline_u' );
m_scanline_type.add_item ('scanline_bin' );
m_scanline_type.cur_item_(1 );
add_ctrl(@m_scanline_type );
m_scanline_type.no_transform;
m_polygons.add_item ('Two Simple Paths' );
m_polygons.add_item ('Closed Stroke' );
m_polygons.add_item ('Great Britain and Arrows' );
m_polygons.add_item ('Great Britain and Spiral' );
m_polygons.add_item ('Spiral and Glyph' );
m_polygons.cur_item_(3 );
add_ctrl(@m_polygons );
m_polygons.no_transform;
end;
{ DESTRUCT }
destructor the_application.Destruct;
begin
inherited Destruct;
m_polygons.Destruct;
m_fill_rule.Destruct;
m_scanline_type.Destruct;
m_operation.Destruct;
end;
{ RENDER_SCANLINE_BOOLEAN }
procedure the_application.render_scanline_boolean;
var
op : sbool_op_e;
rb : renderer_base;
buf : array[0..99 ] of char;
pixf : pixel_formats;
rgba : aggclr;
t1 ,t2 : double;
i : int;
num_spans : unsigned;
renp ,
renu ,
rent : renderer_scanline_aa_solid;
renb : renderer_scanline_bin_solid;
slt ,
slp ,
slp1 ,
slp2 : scanline_p8;
slu ,
slu1 ,
slu2 : scanline_u8;
slb ,
slb1 ,
slb2 : scanline_bin;
txt : gsv_text;
txt_stroke : conv_stroke;
storage ,
storage1 ,
storage2 : scanline_storage_aa8;
storageb ,
storageb1 ,
storageb2 : scanline_storage_bin;
begin
if m_operation._cur_item > 0 then
begin
case m_operation._cur_item of
1 : op:=sbool_or;
2 : op:=sbool_and;
3 : op:=sbool_xor;
4 : op:=sbool_xor_saddle;
5 : op:=sbool_a_minus_b;
6 : op:=sbool_b_minus_a;
end;
pixfmt_bgr24(pixf ,rbuf_window );
rb.Construct(@pixf );
t1:=0.0;
t2:=0.0;
num_spans:=0;
// Render Clipping
case m_scanline_type._cur_item of
0 :
begin
renp.Construct(@rb );
slp.Construct;
slp1.Construct;
slp2.Construct;
// The intermediate storage is used only to test the perfoprmance,
// the short variant can be as follows:
// ------------------------
// rgba.ConstrDbl (0.5 ,0.0 ,0 ,0.5 );
// renp.color (@rgba );
// sbool_combine_shapes_aa(op ,ras1 ,ras2 ,@slp1 ,@slp2 ,@slp ,@renp );
storage.Construct;
storage1.Construct;
storage2.Construct;
render_scanlines(ras1 ,@slp ,@storage1 );
render_scanlines(ras2 ,@slp ,@storage2 );
start_timer;
for i:=0 to 9 do
sbool_combine_shapes_aa(op ,@storage1 ,@storage2 ,@slp1 ,@slp2 ,@slp ,@storage );
t1:=elapsed_time / 10.0;
start_timer;
rgba.ConstrDbl (0.5 ,0.0 ,0 ,0.5 );
renp.color_ (@rgba );
render_scanlines(@storage ,@slp ,@renp );
t2:=elapsed_time;
num_spans:=count_spans(@storage ,@slp );
slp.Destruct;
slp1.Destruct;
slp2.Destruct;
storage.Destruct;
storage1.Destruct;
storage2.Destruct;
end;
1 :
begin
renu.Construct(@rb );
slu.Construct;
slu1.Construct;
slu2.Construct;
{rgba.ConstrDbl (0.5 ,0.0 ,0 ,0.5 );
renu.color (@rgba );
sbool_combine_shapes_aa(op ,ras1 ,ras2 ,@slu1 ,@slu2 ,@slu ,@renu );}
storage.Construct;
storage1.Construct;
storage2.Construct;
render_scanlines(ras1 ,@slu ,@storage1 );
render_scanlines(ras2 ,@slu ,@storage2 );
start_timer;
for i:=0 to 9 do
sbool_combine_shapes_aa(op ,@storage1 ,@storage2 ,@slu1 ,@slu2 ,@slu ,@storage );
t1:=elapsed_time / 10.0;
start_timer;
rgba.ConstrDbl (0.5 ,0.0 ,0 ,0.5 );
renu.color_ (@rgba );
render_scanlines(@storage ,@slu ,@renu );
t2:=elapsed_time;
num_spans:=count_spans(@storage ,@slu );{}
slu.Destruct;
slu1.Destruct;
slu2.Destruct;
storage.Destruct;
storage1.Destruct;
storage2.Destruct;{}
end;
2 :
begin
renb.Construct(@rb );
slb.Construct;
slb1.Construct;
slb2.Construct;
storageb.Construct;
storageb1.Construct;
storageb2.Construct;
render_scanlines(ras1 ,@slb ,@storageb1 );
render_scanlines(ras2 ,@slb ,@storageb2 );
start_timer;
for i:=0 to 9 do
sbool_combine_shapes_bin(op ,@storageb1 ,@storageb2 ,@slb1 ,@slb2 ,@slb ,@storageb );
t1:=elapsed_time / 10.0;
start_timer;
rgba.ConstrDbl ({0.5}1 ,0.0 ,0 {,0.5} );
renb.color_ (@rgba );
render_scanlines(@storageb ,@slb ,@renb );
t2:=elapsed_time;
num_spans:=count_spans(@storageb ,@slb );
slb.Destruct;
slb1.Destruct;
slb2.Destruct;
storageb.Destruct;
storageb1.Destruct;
storageb2.Destruct;
end;
end;
// Render text
sprintf(@buf[0 ] ,'Combine=%.3fms'#13#13 ,t1 );
sprintf(@buf[StrLen(@buf ) ] ,'Render=%.3fms'#13#13 ,t2 );
sprintf(@buf[StrLen(@buf ) ] ,'num_spans=%d' ,num_spans );
rent.Construct(@rb );
slt.Construct;
txt.Construct;
txt_stroke.Construct(@txt );
txt_stroke.width_ (1.0 );
txt_stroke.line_cap_(round_cap );
txt.size_ (8.0 );
txt.start_point_ (420 ,40 );
txt.text_ (@buf[0 ] );
ras1.reset;
ras1.add_path (@txt_stroke );
rgba.ConstrDbl (0.0 ,0.0 ,0.0 );
rent.color_ (@rgba );
render_scanlines(ras1 ,@slt ,@rent );
slt.Destruct;
txt.Destruct;
txt_stroke.Destruct;
end;
end;
{ RENDER_SBOOL }
function the_application.render_sbool;
var
pf : pixel_formats;
rb : renderer_base;
ren : renderer_scanline_aa_solid;
sl : scanline_p8;
ps1 ,
ps2 ,
gb_poly ,
arrows ,
glyph : path_storage;
rgba : aggclr;
x ,y : double;
mtx1 ,
mtx2 ,
mtx : trans_affine;
tat : trans_affine_translation;
tas : trans_affine_scaling;
stroke ,
stroke_gb_poly : conv_stroke;
trans ,
trans_gb_poly ,
trans_arrows : conv_transform;
curve : conv_curve;
sp : spiral;
begin
pixfmt_bgr24(pf ,rbuf_window );
rb.Construct (@pf );
ren.Construct(@rb );
sl.Construct;
if m_fill_rule._cur_item <> 0 then
ras1.filling_rule(fill_non_zero )
else
ras1.filling_rule(fill_even_odd );
if m_fill_rule._cur_item <> 0 then
ras2.filling_rule(fill_non_zero )
else
ras2.filling_rule(fill_even_odd );
case m_polygons._cur_item of
0 : // Two simple paths
begin
ps1.Construct;
ps2.Construct;
x:=m_x - _initial_width / 2 + 100;
y:=m_y - _initial_height / 2 + 100;
ps1.move_to(x + 140 ,y + 145 );
ps1.line_to(x + 225 ,y + 44 );
ps1.line_to(x + 296 ,y + 219 );
ps1.close_polygon;
ps1.line_to(x + 226 ,y + 289 );
ps1.line_to(x + 82 ,y + 292 );
ps1.move_to(x + 220 ,y + 222 );
ps1.line_to(x + 363 ,y + 249 );
ps1.line_to(x + 265 ,y + 331 );
ps1.move_to(x + 242 ,y + 243 );
ps1.line_to(x + 268 ,y + 309 );
ps1.line_to(x + 325 ,y + 261 );
ps1.move_to(x + 259 ,y + 259 );
ps1.line_to(x + 273 ,y + 288 );
ps1.line_to(x + 298 ,y + 266 );
ps2.move_to(100 + 32 ,100 + 77 );
ps2.line_to(100 + 473 ,100 + 263 );
ps2.line_to(100 + 351 ,100 + 290 );
ps2.line_to(100 + 354 ,100 + 374 );
ras1.reset;
ras1.add_path (@ps1 );
rgba.ConstrDbl (0 ,0 ,0 ,{0.1}0.0 );
ren.color_ (@rgba );
{ render_scanlines(ras1 ,@sl ,@ren ); }
ras2.reset;
ras2.add_path (@ps2 );
rgba.ConstrDbl (0 ,0.6 ,0 ,{0.1}0.0 );
ren.color_ (@rgba );
{ render_scanlines(ras2 ,@sl ,@ren ); }
render_scanline_boolean(ras1 ,ras2 );
ps1.Destruct;
ps2.Destruct;
end;
1 : // Closed stroke
begin
ps1.Construct;
ps2.Construct;
stroke.Construct(@ps2 );
stroke.width_ (15.0 );
x:=m_x - _initial_width / 2 + 100;
y:=m_y - _initial_height / 2 + 100;
ps1.move_to(x + 140 ,y + 145 );
ps1.line_to(x + 225 ,y + 44 );
ps1.line_to(x + 296 ,y + 219 );
ps1.close_polygon;
ps1.line_to(x + 226 ,y + 289 );
ps1.line_to(x + 82 ,y + 292 );
ps1.move_to(x + 220 - 50 ,y + 222 );
ps1.line_to(x + 265 - 50 ,y + 331 );
ps1.line_to(x + 363 - 50 ,y + 249 );
ps1.close_polygon(path_flags_ccw );
ps2.move_to(100 + 32 ,100 + 77 );
ps2.line_to(100 + 473 ,100 + 263 );
ps2.line_to(100 + 351 ,100 + 290 );
ps2.line_to(100 + 354 ,100 + 374 );
ps2.close_polygon;
ras1.reset;
ras1.add_path (@ps1 );
rgba.ConstrDbl (0 ,0 ,0 ,0.1 );
ren.color_ (@rgba );
render_scanlines(ras1 ,@sl ,@ren );
ras2.reset;
ras2.add_path (@stroke );
rgba.ConstrDbl (0 ,0.6 ,0 ,0.1 );
ren.color_ (@rgba );
render_scanlines(ras2 ,@sl ,@ren );
render_scanline_boolean(ras1 ,ras2 );
ps1.Destruct;
ps2.Destruct;
stroke.Destruct;
end;
2 : // Great Britain and Arrows
begin
gb_poly.Construct;
arrows.Construct;
make_gb_poly(@gb_poly );
make_arrows (@arrows );
mtx1.Construct;
mtx2.Construct;
tat.Construct(-1150 ,-1150 );
tas.Construct(2.0 );
mtx1.multiply(@tat );
mtx1.multiply(@tas );
mtx2:=mtx1;
tat.Construct(m_x - _initial_width / 2 ,m_y - _initial_height / 2 );
mtx2.multiply(@tat );
trans_gb_poly.Construct(@gb_poly ,@mtx1 );
trans_arrows.Construct (@arrows ,@mtx2 );
ras2.add_path (@trans_gb_poly );
rgba.ConstrDbl (0.5 ,0.5 ,0 ,0.1 );
ren.color_ (@rgba );
render_scanlines(ras2 ,@sl ,@ren );
stroke_gb_poly.Construct(@trans_gb_poly );
stroke_gb_poly.width_ (0.1);
ras1.add_path (@stroke_gb_poly );
rgba.ConstrDbl (0 ,0 ,0 );
ren.color_ (@rgba );
render_scanlines (ras1 ,@sl ,@ren );
ras2.add_path (@trans_arrows );
rgba.ConstrDbl (0.0 ,0.5 ,0.5 ,0.1 );
ren.color_ (@rgba );
render_scanlines(ras2 ,@sl ,@ren );
ras1.reset;
ras1.add_path(@trans_gb_poly );
render_scanline_boolean(ras1 ,ras2 );
gb_poly.Destruct;
arrows.Destruct;
stroke_gb_poly.Destruct;
end;
3 : // Great Britain and a Spiral
begin
sp.Construct (m_x ,m_y ,10 ,150 ,30 ,0.0 );
stroke.Construct(@sp );
stroke.width_ (15.0 );
gb_poly.Construct;
make_gb_poly(@gb_poly );
mtx.Construct;
tat.Construct(-1150 ,-1150 );
tas.Construct(2.0 );
mtx.multiply(@tat );
mtx.multiply(@tas );
mtx.multiply(_trans_affine_resizing );
trans_gb_poly.Construct(@gb_poly ,@mtx );
ras1.add_path (@trans_gb_poly );
rgba.ConstrDbl (0.5 ,0.5 ,0 ,0.1 );
ren.color_ (@rgba );
render_scanlines(ras1 ,@sl ,@ren );
stroke_gb_poly.Construct(@trans_gb_poly );
stroke_gb_poly.width_ (0.1 );
ras1.add_path (@stroke_gb_poly );
rgba.ConstrDbl (0 ,0 ,0 );
ren.color_ (@rgba );
render_scanlines (ras1 ,@sl ,@ren );
ras2.reset;
ras2.add_path (@stroke );
rgba.ConstrDbl (0.0 ,0.5 ,0.5 ,0.1 );
ren.color_ (@rgba );
render_scanlines(ras2 ,@sl ,@ren );
ras1.reset;
ras1.add_path(@trans_gb_poly );
render_scanline_boolean(ras1 ,ras2 );
stroke.Destruct;
gb_poly.Destruct;
stroke_gb_poly.Destruct;
end;
4 : // Spiral and glyph
begin
sp.Construct (m_x ,m_y ,10 ,150 ,30 ,0.0 );
stroke.Construct(@sp );
stroke.width_ (15.0 );
glyph.Construct;
glyph.move_to(28.47 ,6.45 );
glyph.curve3 (21.58 ,1.12 ,19.82 ,0.29 );
glyph.curve3 (17.19 ,-0.93 ,14.21 ,-0.93 );
glyph.curve3 (9.57 ,-0.93 ,6.57 ,2.25 );
glyph.curve3 (3.56 ,5.42 ,3.56 ,10.60 );
glyph.curve3 (3.56 ,13.87 ,5.03 ,16.26 );
glyph.curve3 (7.03 ,19.58 ,11.99 ,22.51 );
glyph.curve3 (16.94 ,25.44 ,28.47 ,29.64 );
glyph.line_to(28.47 ,31.40 );
glyph.curve3 (28.47 ,38.09 ,26.34 ,40.58 );
glyph.curve3 (24.22 ,43.07 ,20.17 ,43.07 );
glyph.curve3 (17.09 ,43.07 ,15.28 ,41.41 );
glyph.curve3 (13.43 ,39.75 ,13.43 ,37.60 );
glyph.line_to(13.53 ,34.77 );
glyph.curve3 (13.53 ,32.52 ,12.38 ,31.30 );
glyph.curve3 (11.23 ,30.08 ,9.38 ,30.08 );
glyph.curve3 (7.57 ,30.08 ,6.42 ,31.35 );
glyph.curve3 (5.27 ,32.62 ,5.27 ,34.81 );
glyph.curve3 (5.27 ,39.01 ,9.57 ,42.53 );
glyph.curve3 (13.87 ,46.04 ,21.63 ,46.04 );
glyph.curve3 (27.59 ,46.04 ,31.40 ,44.04 );
glyph.curve3 (34.28 ,42.53 ,35.64 ,39.31 );
glyph.curve3 (36.52 ,37.21 ,36.52 ,30.71 );
glyph.line_to(36.52 ,15.53 );
glyph.curve3 (36.52 ,9.13 ,36.77 ,7.69 );
glyph.curve3 (37.01 ,6.25 ,37.57 ,5.76 );
glyph.curve3 (38.13 ,5.27 ,38.87 ,5.27 );
glyph.curve3 (39.65 ,5.27 ,40.23 ,5.62 );
glyph.curve3 (41.26 ,6.25 ,44.19 ,9.18 );
glyph.line_to(44.19 ,6.45 );
glyph.curve3 (38.72 ,-0.88 ,33.74 ,-0.88 );
glyph.curve3 (31.35 ,-0.88 ,29.93 ,0.78 );
glyph.curve3 (28.52 ,2.44 ,28.47 ,6.45 );
glyph.close_polygon;
glyph.move_to(28.47 ,9.62 );
glyph.line_to(28.47 ,26.66 );
glyph.curve3 (21.09 ,23.73 ,18.95 ,22.51 );
glyph.curve3 (15.09 ,20.36 ,13.43 ,18.02 );
glyph.curve3 (11.77 ,15.67 ,11.77 ,12.89 );
glyph.curve3 (11.77 ,9.38 ,13.87 ,7.06 );
glyph.curve3 (15.97 ,4.74 ,18.70 ,4.74 );
glyph.curve3 (22.41 ,4.74 ,28.47 ,9.62 );
glyph.close_polygon;
mtx.Construct;
tas.Construct(4.0 );
tat.Construct(220 ,200 );
mtx.multiply(@tas );
mtx.multiply(@tat );
trans.Construct(@glyph ,@mtx );
curve.Construct(@trans );
ras1.reset;
ras1.add_path (@stroke );
rgba.ConstrDbl (0 ,0 ,0 ,0.1 );
ren.color_ (@rgba );
render_scanlines(ras1 ,@sl ,@ren );
ras2.reset;
ras2.add_path (@curve );
rgba.ConstrDbl (0 ,0.6 ,0 ,0.1 );
ren.color_ (@rgba );
render_scanlines(ras2 ,@sl ,@ren );
render_scanline_boolean(ras1 ,ras2 );
stroke.Destruct;
glyph.Destruct;
curve.Destruct;
end;
end;
sl.Destruct;
result:=0;
end;
{ ON_INIT }
procedure the_application.on_init;
begin
m_x:=_width / 2.0;
m_y:=_height / 2.0;
end;
{ ON_DRAW }
procedure the_application.on_draw;
var
pf : pixel_formats;
rgba : aggclr;
ren_base : renderer_base;
ren_solid : renderer_scanline_aa_solid;
sl : scanline_u8;
ras ,
ras2 : rasterizer_scanline_aa;
begin
// Initialize structures
pixfmt_bgr24(pf ,rbuf_window );
ren_base.Construct (@pf );
ren_solid.Construct(@ren_base );
rgba.ConstrDbl(1 ,1 ,1 );
ren_base.clear(@rgba );
sl.Construct;
ras.Construct;
ras2.Construct;
// Render the controls
render_ctrl(@ras ,@sl ,@ren_solid ,@m_polygons );
render_ctrl(@ras ,@sl ,@ren_solid ,@m_fill_rule );
render_ctrl(@ras ,@sl ,@ren_solid ,@m_scanline_type );
render_ctrl(@ras ,@sl ,@ren_solid ,@m_operation );
// Render
render_sbool(@ras ,@ras2 );
// Free AGG resources
sl.Destruct;
ras.Destruct;
ras2.Destruct;
end;
{ ON_MOUSE_MOVE }
procedure the_application.on_mouse_move;
begin
if flags and mouse_left <> 0 then
begin
m_x:=x;
m_y:=y;
force_redraw;
end;
end;
{ ON_MOUSE_BUTTON_DOWN }
procedure the_application.on_mouse_button_down;
var
buf : array[0..99 ] of char;
begin
if flags and mouse_left <> 0 then
begin
m_x:=x;
m_y:=y;
force_redraw;
end;
if flags and mouse_right <> 0 then
begin
sprintf (@buf[0 ] ,'%d ' ,x );
sprintf (@buf[StrLen(@buf ) ] ,'%d' ,y );
message_(@buf[0 ] );
end;
end;
{ ON_KEY }
procedure the_application.on_key;
begin
if key = key_f1 then
message_(
'This is another example of using of the scanline boolean algebra. The example is '#13 +
'similar to Demo gpc_test. Note that the cost of the boolean operation with Anti-Aliasing '#13 +
'is comparable with rendering (the rasterization time is not included). Also note that '#13 +
'there is a difference in timings between using of scanline_u and scanline_p. Most often '#13 +
'scanline_u works faster, but it''s because of much less number of produced spans.'#13 +
'Actually, when using the scanline_u the complexity of the algorithm becomes proportional '#13 +
'to the area of the polygons, while in scanline_p it''s proportional to the perimeter. '#13 +
'Of course, the binary variant works much faster than the Anti-Aliased one.' +
#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. Scanline Boolean (F1-Help)' );
if app.init(655 ,520 ,window_resize ) then
app.run;
app.Destruct;
END.