mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-10-31 04:01:28 +01:00
385 lines
8.2 KiB
ObjectPascal
385 lines
8.2 KiB
ObjectPascal
//
|
|
// 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_boolean ;
|
|
|
|
{DEFINE AGG_GRAY8 }
|
|
{$DEFINE AGG_BGR24 }
|
|
{DEFINE AGG_RGB24 }
|
|
{DEFINE AGG_BGRA32 }
|
|
{DEFINE AGG_RGBA32 }
|
|
{DEFINE AGG_ARGB32 }
|
|
{DEFINE AGG_ABGR32 }
|
|
{DEFINE AGG_RGB565 }
|
|
{DEFINE AGG_RGB555 }
|
|
|
|
uses
|
|
agg_basics ,
|
|
agg_platform_support ,
|
|
|
|
agg_ctrl ,
|
|
agg_slider_ctrl ,
|
|
agg_cbox_ctrl ,
|
|
agg_rbox_ctrl ,
|
|
|
|
agg_rasterizer_scanline_aa ,
|
|
agg_scanline ,
|
|
agg_scanline_p ,
|
|
agg_scanline_u ,
|
|
agg_scanline_bin ,
|
|
agg_scanline_boolean_algebra ,
|
|
|
|
agg_renderer_base ,
|
|
agg_renderer_scanline ,
|
|
agg_render_scanlines ,
|
|
|
|
agg_path_storage ,
|
|
agg_ellipse ,
|
|
agg_gamma_functions ,
|
|
interactive_polygon_
|
|
|
|
{$I pixel_formats.inc }
|
|
{$I agg_mode.inc }
|
|
|
|
const
|
|
flip_y = true;
|
|
|
|
type
|
|
the_application = object(platform_support )
|
|
m_quad1 ,
|
|
m_quad2 : interactive_polygon;
|
|
|
|
m_trans_type : rbox_ctrl;
|
|
|
|
m_reset : cbox_ctrl;
|
|
m_mul1 ,
|
|
m_mul2 : slider_ctrl;
|
|
|
|
constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
|
|
destructor Destruct;
|
|
|
|
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_mouse_button_up (x ,y : int; flags : unsigned ); virtual;
|
|
|
|
procedure on_ctrl_change; virtual;
|
|
|
|
procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
|
|
|
|
end;
|
|
|
|
{ GENERATE_CIRCLES }
|
|
procedure generate_circles(ps : path_storage_ptr; quad : double_ptr; num_circles : unsigned; radius : double );
|
|
var
|
|
ell : ellipse;
|
|
|
|
i ,j ,n1 ,n2 : unsigned;
|
|
|
|
begin
|
|
ps.remove_all;
|
|
ell.Construct;
|
|
|
|
for i:=0 to 3 do
|
|
begin
|
|
n1:=i * 2;
|
|
|
|
if i < 3 then
|
|
n2:=i * 2 + 2
|
|
else
|
|
n2:=0;
|
|
|
|
for j:=0 to num_circles - 1 do
|
|
begin
|
|
ell.init(
|
|
double_ptr(ptrcomp(quad ) + n1 * sizeof(double ) )^ +
|
|
(double_ptr(ptrcomp(quad ) + n2 * sizeof(double ) )^ -
|
|
double_ptr(ptrcomp(quad ) + n1 * sizeof(double ) )^ ) *
|
|
j / num_circles ,
|
|
double_ptr(ptrcomp(quad ) + (n1 + 1 ) * sizeof(double ) )^ +
|
|
(double_ptr(ptrcomp(quad ) + (n2 + 1 ) * sizeof(double ) )^ -
|
|
double_ptr(ptrcomp(quad ) + (n1 + 1 ) * sizeof(double ) )^ ) *
|
|
j / num_circles ,
|
|
radius ,radius ,100 );
|
|
|
|
ps.add_path(@ell ,0 ,false );
|
|
|
|
end;
|
|
|
|
end;
|
|
|
|
end;
|
|
|
|
{ CONSTRUCT }
|
|
constructor the_application.Construct;
|
|
begin
|
|
inherited Construct(format_ ,flip_y_ );
|
|
|
|
m_quad1.Construct(4 ,5.0 );
|
|
m_quad2.Construct(4 ,5.0 );
|
|
|
|
m_trans_type.Construct(420 ,5.0 ,420 + 130.0 ,145.0 ,not flip_y_ );
|
|
|
|
m_reset.Construct(350 ,5.0 ,'Reset' ,not flip_y_ );
|
|
|
|
m_mul1.Construct(5.0 ,5.0 ,340.0 ,12.0 ,not flip_y_ );
|
|
m_mul2.Construct(5.0 ,20.0 ,340.0 ,27.0 ,not flip_y_ );
|
|
|
|
m_trans_type.add_item ('Union' );
|
|
m_trans_type.add_item ('Intersection' );
|
|
m_trans_type.add_item ('Linear XOR' );
|
|
m_trans_type.add_item ('Saddle XOR' );
|
|
m_trans_type.add_item ('Abs Diff XOR' );
|
|
m_trans_type.add_item ('A-B' );
|
|
m_trans_type.add_item ('B-A' );
|
|
m_trans_type.cur_item_(0 );
|
|
|
|
add_ctrl(@m_trans_type );
|
|
add_ctrl(@m_reset );
|
|
add_ctrl(@m_mul1 );
|
|
add_ctrl(@m_mul2 );
|
|
|
|
m_mul1.value_(1.0 );
|
|
m_mul2.value_(1.0 );
|
|
m_mul1.label_('Opacity1=%.3f' );
|
|
m_mul2.label_('Opacity2=%.3f' );
|
|
|
|
end;
|
|
|
|
{ DESTRUCT }
|
|
destructor the_application.Destruct;
|
|
begin
|
|
inherited Destruct;
|
|
|
|
m_quad1.Destruct;
|
|
m_quad2.Destruct;
|
|
|
|
m_trans_type.Destruct;
|
|
m_reset.Destruct;
|
|
m_mul1.Destruct;
|
|
m_mul2.Destruct;
|
|
|
|
end;
|
|
|
|
{ ON_INIT }
|
|
procedure the_application.on_init;
|
|
begin
|
|
m_quad1.xn_ptr(0 )^:=50;
|
|
m_quad1.yn_ptr(0 )^:=200 - 20;
|
|
m_quad1.xn_ptr(1 )^:=_width / 2 - 25;
|
|
m_quad1.yn_ptr(1 )^:=200;
|
|
m_quad1.xn_ptr(2 )^:=_width / 2 - 25;
|
|
m_quad1.yn_ptr(2 )^:=_height - 50 - 20;
|
|
m_quad1.xn_ptr(3 )^:=50;
|
|
m_quad1.yn_ptr(3 )^:=_height - 50;
|
|
|
|
m_quad2.xn_ptr(0 )^:=_width / 2 + 25;
|
|
m_quad2.yn_ptr(0 )^:=200 - 20;
|
|
m_quad2.xn_ptr(1 )^:=_width - 50;
|
|
m_quad2.yn_ptr(1 )^:=200;
|
|
m_quad2.xn_ptr(2 )^:=_width - 50;
|
|
m_quad2.yn_ptr(2 )^:=_height - 50 - 20;
|
|
m_quad2.xn_ptr(3 )^:=_width / 2 + 25;
|
|
m_quad2.yn_ptr(3 )^:=_height - 50;
|
|
|
|
end;
|
|
|
|
{ ON_DRAW }
|
|
procedure the_application.on_draw;
|
|
var
|
|
pixf : pixel_formats;
|
|
|
|
rb : renderer_base;
|
|
r : renderer_scanline_aa_solid;
|
|
sl : scanline_p8;
|
|
|
|
ras ,
|
|
ras1 ,
|
|
ras2 : rasterizer_scanline_aa;
|
|
rgba : aggclr;
|
|
|
|
op : sbool_op_e;
|
|
gm : gamma_multiply;
|
|
|
|
ps1 ,
|
|
ps2 : path_storage;
|
|
|
|
sl_result ,sl1 ,sl2 : scanline_p8;
|
|
|
|
sren : renderer_scanline_aa_solid;
|
|
|
|
begin
|
|
// Initialize structures
|
|
pixfmt(pixf ,rbuf_window );
|
|
|
|
rb.Construct(@pixf );
|
|
r.Construct (@rb );
|
|
|
|
rgba.ConstrDbl(1 ,1 ,1 );
|
|
rb.clear (@rgba );
|
|
|
|
sl.Construct;
|
|
ras.Construct;
|
|
ras1.Construct;
|
|
ras2.Construct;
|
|
|
|
// Draw
|
|
op:=sbool_op_e(m_trans_type._cur_item );
|
|
|
|
gm.Construct(m_mul1._value );
|
|
ras1.gamma (@gm );
|
|
|
|
gm.Construct(m_mul2._value );
|
|
ras2.gamma (@gm );
|
|
|
|
ras.clip_box(0 ,0 ,_width ,_height );
|
|
|
|
ps1.Construct;
|
|
generate_circles(@ps1 ,m_quad1.polygon ,5 ,20 );
|
|
|
|
ps2.Construct;
|
|
generate_circles(@ps2 ,m_quad2.polygon ,5 ,20 );
|
|
|
|
ras1.filling_rule(fill_even_odd );
|
|
|
|
// Bottom Layer of Polygon1
|
|
rgba.ConstrInt(240, 255, 200, 100 );
|
|
r.color_ (@rgba );
|
|
|
|
ras1.add_path (@ps1 );
|
|
render_scanlines(@ras1 ,@sl ,@r );
|
|
|
|
// Bottom Layer of Polygon2
|
|
rgba.ConstrInt(255 ,240 ,240 ,100 );
|
|
r.color_ (@rgba );
|
|
|
|
ras2.add_path (@ps2 );
|
|
render_scanlines(@ras2 ,@sl ,@r );
|
|
|
|
// Combine shapes
|
|
sl_result.Construct;
|
|
sl1.Construct;
|
|
sl2.Construct;
|
|
sren.Construct(@rb );
|
|
|
|
rgba.ConstrInt(0 ,0 ,0 );
|
|
sren.color_ (@rgba );
|
|
|
|
sbool_combine_shapes_aa(op ,@ras1 ,@ras2 ,@sl1 ,@sl2 ,@sl_result ,@sren );
|
|
|
|
// Render the "quad" tools
|
|
rgba.ConstrDbl(0 ,0.3 ,0.5 ,0.6 );
|
|
r.color_ (@rgba );
|
|
|
|
ras.add_path (@m_quad1 );
|
|
render_scanlines(@ras ,@sl ,@r );
|
|
|
|
ras.add_path (@m_quad2 );
|
|
render_scanlines(@ras ,@sl ,@r );
|
|
|
|
// Render the controls
|
|
render_ctrl(@ras ,@sl ,@r ,@m_trans_type);
|
|
render_ctrl(@ras ,@sl ,@r ,@m_reset);
|
|
render_ctrl(@ras ,@sl ,@r ,@m_mul1);
|
|
render_ctrl(@ras ,@sl ,@r ,@m_mul2);
|
|
|
|
// Free AGG resources
|
|
ps1.Destruct;
|
|
ps2.Destruct;
|
|
|
|
ras2.Destruct;
|
|
ras1.Destruct;
|
|
|
|
sl_result.Destruct;
|
|
sl1.Destruct;
|
|
sl2.Destruct;
|
|
|
|
ras.Destruct;
|
|
sl.Destruct;
|
|
|
|
end;
|
|
|
|
{ ON_MOUSE_MOVE }
|
|
procedure the_application.on_mouse_move;
|
|
begin
|
|
if flags and mouse_left <> 0 then
|
|
if m_quad1.on_mouse_move(x ,y ) or
|
|
m_quad2.on_mouse_move(x ,y ) then
|
|
force_redraw;
|
|
|
|
if flags and mouse_left = 0 then
|
|
on_mouse_button_up(x ,y ,flags );
|
|
|
|
end;
|
|
|
|
{ ON_MOUSE_BUTTON_DOWN }
|
|
procedure the_application.on_mouse_button_down;
|
|
begin
|
|
if flags and mouse_left <> 0 then
|
|
if m_quad1.on_mouse_button_down(x ,y ) or
|
|
m_quad2.on_mouse_button_down(x ,y ) then
|
|
force_redraw;
|
|
|
|
end;
|
|
|
|
{ ON_MOUSE_BUTTON_UP }
|
|
procedure the_application.on_mouse_button_up;
|
|
begin
|
|
if m_quad1.on_mouse_button_up(x ,y ) or
|
|
m_quad2.on_mouse_button_up(x ,y ) then
|
|
force_redraw;
|
|
|
|
end;
|
|
|
|
{ ON_CTRL_CHANGE }
|
|
procedure the_application.on_ctrl_change;
|
|
begin
|
|
if m_reset._status then
|
|
begin
|
|
on_init;
|
|
m_reset.status_(false );
|
|
force_redraw;
|
|
|
|
end;
|
|
|
|
end;
|
|
|
|
{ ON_KEY }
|
|
procedure the_application.on_key;
|
|
begin
|
|
if key = key_f1 then
|
|
message_(
|
|
'A new method to perform boolean operations on polygons (Union, Intersection, XOR, '#13 +
|
|
'and Difference). It uses the scanline approach and in typical screen resolutions '#13 +
|
|
'works much faster (about 10 times) than vectorial algorithms like General Polygon '#13 +
|
|
'Clipper. It preserves perfect Anti-Aliasing and besides, can work with translucency. '#13 +
|
|
'There are two XOR operations, Linear XOR and Saddle XOR. The only difference is in '#13 +
|
|
'the formula of XORing of the two cells with Anti-Aliasing. The first one is:'#13#13 +
|
|
'cover = a+b; if(cover > 1) cover = 2.0 - cover;'#13#13 +
|
|
'The second uses the classical "Saddle" formula:'#13#13 +
|
|
'cover = 1.0 - (1.0 - a + a*b) * (1.0 - b + a*b);'#13#13 +
|
|
'The Linear XOR produces more correct intersections and works constistently with the'#13 +
|
|
'scanline rasterizer algorithm. The Saddle XOR works better with semi-transparent polygons. ' +
|
|
#13#13'Note: F2 key saves current "screenshot" file in this demo''s directory. ' );
|
|
|
|
end;
|
|
|
|
VAR
|
|
app : the_application;
|
|
|
|
BEGIN
|
|
app.Construct(pix_format ,flip_y );
|
|
app.caption_ ('AGG Example. Scanline Boolean (F1-Help)' );
|
|
|
|
if app.init(800 ,600 ,window_resize ) then
|
|
app.run;
|
|
|
|
app.Destruct;
|
|
|
|
END. |