lazarus/components/aggpas/multi_clip.dpr
mattias 36a2b1ea07 added aggpas
git-svn-id: trunk@21942 -
2009-10-01 12:24:32 +00:00

542 lines
10 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
multi_clip ;
{DEFINE AGG_GRAY8 }
{$DEFINE AGG_BGR24 }
{DEFINE AGG_RGB24 }
{DEFINE AGG_BGRA32 }
{DEFINE AGG_RGBA32 }
{DEFINE AGG_ARGB32 }
{DEFINE AGG_ABGR32 }
{DEFINE AGG_RGB565 }
{DEFINE AGG_RGB555 }
uses
Math ,
agg_basics ,
agg_array ,
agg_platform_support ,
agg_ctrl ,
agg_slider_ctrl ,
agg_rasterizer_scanline_aa ,
agg_rasterizer_outline_aa ,
agg_scanline ,
agg_scanline_u ,
agg_rendering_buffer ,
agg_renderer_base ,
agg_renderer_scanline ,
agg_renderer_outline_aa ,
agg_renderer_primitives ,
agg_renderer_markers ,
agg_renderer_mclip ,
agg_render_scanlines ,
agg_path_storage ,
agg_bounding_rect ,
agg_trans_affine ,
agg_conv_transform ,
agg_ellipse ,
agg_span_gradient ,
agg_span_allocator ,
agg_span_interpolator_linear ,
parse_lion_
{$I pixel_formats.inc }
{$I agg_mode.inc }
const
flip_y = true;
var
g_rasterizer : rasterizer_scanline_aa;
g_scanline : scanline_u8;
g_path : path_storage;
g_colors : array[0..99 ] of aggclr;
g_path_idx : array[0..99 ] of unsigned;
g_npaths : unsigned;
g_x1 ,g_y1 ,g_x2 ,g_y2 ,
g_base_dx ,g_base_dy ,
g_angle ,g_scale ,
g_skew_x ,g_skew_y : double;
g_nclick : int;
type
gradient_linear_color = object(pod_auto_array )
m_c1 ,m_c2 ,c : aggclr;
constructor Construct(c1 ,c2 : aggclr_ptr );
function size : unsigned; virtual;
function array_operator(i : unsigned ) : pointer; virtual;
procedure colors(c1 ,c2 : aggclr_ptr );
end;
the_application = object(platform_support )
m_num_cb : slider_ctrl;
constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
destructor Destruct;
procedure on_draw; virtual;
procedure transform(width_ ,height_ ,x ,y : double );
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 gradient_linear_color.Construct;
begin
m_c1:=c1^;
m_c2:=c2^;
end;
{ SIZE }
function gradient_linear_color.size;
begin
result:=256;
end;
{ ARRAY_OPERATOR }
function gradient_linear_color.array_operator;
begin
c.v:=int8u((((m_c2.v - m_c1.v ) * i ) + (m_c1.v shl 8 ) ) shr 8 );
c.r:=int8u((((m_c2.r - m_c1.r ) * i ) + (m_c1.r shl 8 ) ) shr 8 );
c.g:=int8u((((m_c2.g - m_c1.g ) * i ) + (m_c1.g shl 8 ) ) shr 8 );
c.b:=int8u((((m_c2.b - m_c1.b ) * i ) + (m_c1.b shl 8 ) ) shr 8 );
c.a:=int8u((((m_c2.a - m_c1.a ) * i ) + (m_c1.a shl 8 ) ) shr 8 );
result:=@c;
end;
{ COLORS }
procedure gradient_linear_color.colors;
begin
m_c1:=c1^;
m_c2:=c2^;
end;
{ _PARSE_LION_ }
procedure _parse_lion_;
begin
g_npaths:=parse_lion(@g_path ,@g_colors ,@g_path_idx );
bounding_rect(@g_path ,@g_path_idx ,0 ,g_npaths ,@g_x1 ,@g_y1 ,@g_x2 ,@g_y2 );
g_base_dx:=(g_x2 - g_x1 ) / 2.0;
g_base_dy:=(g_y2 - g_y1 ) / 2.0;
end;
{ CONSTRUCT }
constructor the_application.Construct;
begin
inherited Construct(format_ ,flip_y_ );
m_num_cb.Construct(5 ,5 ,150 ,12 ,not flip_y_ );
_parse_lion_;
add_ctrl(@m_num_cb );
m_num_cb.range_ (2 ,10 );
//m_num_cb.num_steps_(8 );
m_num_cb.label_ ('N=%.2f' );
m_num_cb.no_transform;
end;
{ DESTRUCT }
destructor the_application.Destruct;
begin
inherited Destruct;
m_num_cb.Destruct;
end;
{ ON_DRAW }
procedure the_application.on_draw;
var
i : unsigned;
width_ ,height_ ,x ,y ,x1 ,y1 ,x2 ,y2 : int;
pf : pixel_formats;
r : renderer_mclip;
rs : renderer_scanline_aa_solid;
rgba ,
rgbb : aggclr;
mtx : trans_affine;
tat : trans_affine_translation;
tas : trans_affine_scaling;
tar : trans_affine_rotation;
taw : trans_affine_skewing;
trans : conv_transform;
m : renderer_markers;
w ,
n : double;
profile : line_profile_aa;
ren : renderer_outline_aa;
ras : rasterizer_outline_aa;
grm : trans_affine;
grf : gradient_circle;
grc : gradient_linear_color;
ell : ellipse;
sa : span_allocator;
sg : span_gradient;
rg : renderer_scanline_aa;
inter : span_interpolator_linear;
begin
width_ :=rbuf_window._width;
height_:=rbuf_window._height;
// Initialize structures
pixfmt(pf ,rbuf_window );
r.Construct (@pf );
rs.Construct(@r );
// Transform lion
mtx.Construct;
tat.Construct(-g_base_dx ,-g_base_dy );
mtx.multiply (@tat );
tas.Construct(g_scale ,g_scale );
mtx.multiply (@tas );
tar.Construct(g_angle + pi );
mtx.multiply (@tar );
taw.Construct(g_skew_x / 1000.0 ,g_skew_y / 1000.0 );
mtx.multiply (@taw );
tat.Construct(_width / 2 ,_height / 2 );
mtx.multiply (@tat );
rgba.ConstrDbl(1 ,1 ,1 );
r.clear (@rgba );
// Custom Clip Renderer Base
r.reset_clipping(false ); // Visibility: "false" means "no visible regions"
n:=m_num_cb._value;
x:=0;
while x < n do
begin
y:=0;
while y < n do
begin
x1:=trunc(width_ * x / n );
y1:=trunc(height_ * y / n );
x2:=trunc(width_ * (x + 1 ) / n );
y2:=trunc(height_ * (y + 1 ) / n );
r.add_clip_box(x1 + 5 ,y1 + 5 ,x2 - 5 ,y2 - 5 );
inc(y );
end;
inc(x );
end;{}
// Render the lion
trans.Construct (@g_path ,@mtx );
render_all_paths(@g_rasterizer ,@g_scanline ,@rs ,@trans ,@g_colors ,@g_path_idx ,g_npaths );{}
// The scanline rasterizer allows you to perform clipping to multiple
// regions "manually", like in the following code, but the "embedded" method
// shows much better performance.
{ for i:=0 to g_npaths - 1 do
begin
g_rasterizer.reset;
g_rasterizer.add_path(@trans ,g_path_idx[i ] );
rs.color_(@g_colors[i ] );
n:=m_num_cb._value;
x:=0;
while x < n do
begin
y:=0;
while y < n do
begin
x1:=trunc(width_ * x / n );
y1:=trunc(height_ * y / n );
x2:=trunc(width_ * (x + 1 ) / n );
y2:=trunc(height_ * (y + 1 ) / n );
// r should be of type renderer_base
r.clip_box_(x1 + 5 ,y1 + 5 ,x2 - 5 ,y2 - 5 );
render_scanlines(@g_rasterizer ,@g_scanline ,@rs );
inc(y );
end;
inc(x );
end;
end;{}
// Render random Bresenham lines and markers
m.Construct(@r );
for i:=0 to 49 do
begin
rgba.ConstrInt(
Random($7fff ) and $7F ,
Random($7fff ) and $7F ,
Random($7fff ) and $7F ,
(Random($7fff ) and $7F ) + $7F );
m.line_color_(@rgba );
rgba.ConstrInt(
Random($7fff ) and $7F ,
Random($7fff ) and $7F ,
Random($7fff ) and $7F ,
(Random($7fff ) and $7F ) + $7F );
m.fill_color_(@rgba );
m.line(
m.coord(Random($7fff ) mod width_ ) ,m.coord(Random($7fff ) mod height_ ) ,
m.coord(Random($7fff ) mod width_ ) ,m.coord(Random($7fff ) mod height_ ) );
m.marker(
Random($7fff ) mod width_ ,Random($7fff ) mod height_ ,Random($7fff ) mod 10 + 5 ,
marker_e(Random($7fff ) mod int(end_of_markers ) ) );
end;
// Render random anti-aliased lines
w:=5.0;
profile.Construct;
profile.width_(w );
ren.Construct (@r ,@profile );
ras.Construct (@ren );
ras.round_cap_(true );
for i:=0 to 49 do
begin
rgba.ConstrInt(
Random($7fff ) and $7F ,
Random($7fff ) and $7F ,
Random($7fff ) and $7F ,
(Random($7fff ) and $7F ) + $7F );
ren.color_(@rgba );
ras.move_to_d(Random($7fff ) mod width_ ,Random($7fff ) mod height_ );
ras.line_to_d(Random($7fff ) mod width_ ,Random($7fff ) mod height_ );
ras.render (false );
end;
// Render random circles with gradient
grm.Construct;
grf.Construct;
rgba.ConstrInt(0 ,0 ,0 );
rgbb.ConstrInt(0 ,0 ,0 );
grc.Construct (@rgba ,@rgbb );
ell.Construct;
sa.Construct;
inter.Construct(@grm );
sg.Construct(@sa ,@inter ,@grf ,@grc ,0 ,10 );
rg.Construct(@r ,@sg );
for i:=0 to 49 do
begin
x:=Random($7fff ) mod width_;
y:=Random($7fff ) mod height_;
w:=Random($7fff ) mod 10 + 5;
grm.reset;
tas.Construct(w / 10.0 );
grm.multiply (@tas );
tat.Construct(x ,y );
grm.multiply (@tat );
grm.invert;
rgba.ConstrInt(255 ,255 ,255 ,0 );
rgbb.ConstrInt(
Random($7fff ) and $7F ,
Random($7fff ) and $7F ,
Random($7fff ) and $7F ,255 );
grc.colors(@rgba ,@rgbb );
sg.color_function_(@grc );
ell.init(x ,y ,w ,w ,32 );
g_rasterizer.add_path(@ell );
render_scanlines (@g_rasterizer ,@g_scanline ,@rg );
end;
// Render the controls
r.reset_clipping(true ); // "true" means "all rendering buffer is visible".
render_ctrl(@g_rasterizer ,@g_scanline ,@rs ,@m_num_cb );
// Free AGG resources
profile.Destruct;
ras.Destruct;
sa.Destruct;
r.Destruct;
end;
{ TRANSFORM }
procedure the_application.transform;
begin
x:=x - width_ / 2;
y:=y - height_ / 2;
g_angle:=ArcTan2(y ,x );
g_scale:=Sqrt(y * y + x * x ) / 100.0;
end;
{ ON_MOUSE_MOVE }
procedure the_application.on_mouse_move;
begin
on_mouse_button_down(x ,y ,flags );
end;
{ ON_MOUSE_BUTTON_DOWN }
procedure the_application.on_mouse_button_down;
var
width_ ,height_ : int;
begin
if flags and mouse_left <> 0 then
begin
width_ :=rbuf_window._width;
height_:=rbuf_window._height;
transform(width_ ,height_ ,x ,y );
force_redraw;
end;
if flags and mouse_right <> 0 then
begin
g_skew_x:=x;
g_skew_y:=y;
force_redraw;
end;
end;
{ ON_KEY }
procedure the_application.on_key;
begin
if key = key_f1 then
message_(
'A testing example that demonstrates clipping to multiple rectangular regions. '#13 +
'It''s a low-level (pixel) clipping that can be useful to draw images clipped '#13 +
'to a complex region with orthogonal boundaries. It can be useful in some window '#13 +
'interfaces that use a custom mechanism to draw window content. The example '#13 +
'uses all possible rendering mechanisms.'#13#13 +
'How to play with:'#13#13 +
'Use the left mouse button to rotate and resize the lion.'#13 +
'Use the right mouse button to skew the lion.' +
#13#13'Note: F2 key saves current "screenshot" file in this demo''s directory. ' );
end;
VAR
app : the_application;
BEGIN
// Rendering
g_rasterizer.Construct;
g_scanline.Construct;
g_path.Construct;
g_npaths:=0;
g_x1:=0;
g_y1:=0;
g_x2:=0;
g_y2:=0;
g_base_dx:=0;
g_base_dy:=0;
g_angle:=0;
g_scale:=1.0;
g_skew_x:=0;
g_skew_y:=0;
g_nclick:=0;
// App
app.Construct(pix_format ,flip_y );
app.caption_ ('AGG Example. Clipping to multiple rectangle regions (F1-Help)' );
if app.init(512 ,400 ,window_resize ) then
app.run;
app.Destruct;
// Free
g_rasterizer.Destruct;
g_scanline.Destruct;
g_path.Destruct;
END.