mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-04-27 19:53:42 +02:00
274 lines
6.9 KiB
ObjectPascal
274 lines
6.9 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
|
||
conv_contour_ ;
|
||
|
||
uses
|
||
agg_basics ,
|
||
agg_platform_support ,
|
||
|
||
agg_color ,
|
||
agg_pixfmt ,
|
||
agg_pixfmt_rgb ,
|
||
|
||
agg_ctrl ,
|
||
agg_rbox_ctrl ,
|
||
agg_cbox_ctrl ,
|
||
agg_slider_ctrl ,
|
||
|
||
agg_rendering_buffer ,
|
||
agg_renderer_base ,
|
||
agg_renderer_scanline ,
|
||
agg_rasterizer_scanline_aa ,
|
||
agg_scanline_p ,
|
||
agg_render_scanlines ,
|
||
|
||
agg_conv_stroke ,
|
||
agg_conv_transform ,
|
||
agg_conv_curve ,
|
||
agg_conv_contour ,
|
||
agg_path_storage ,
|
||
agg_trans_affine ,
|
||
agg_math_stroke ;
|
||
|
||
{$I agg_mode.inc }
|
||
|
||
const
|
||
flip_y = true;
|
||
|
||
type
|
||
the_application = object(platform_support )
|
||
m_close : rbox_ctrl;
|
||
m_width : slider_ctrl;
|
||
m_auto_detect : cbox_ctrl;
|
||
m_path : path_storage;
|
||
|
||
constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
|
||
destructor Destruct;
|
||
|
||
procedure compose_path;
|
||
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_ );
|
||
|
||
m_close.Construct (10.0 ,10.0 ,130.0 ,80.0 ,not flip_y_ );
|
||
m_width.Construct (130 + 10.0 ,10.0 + 4.0 ,130 + 300.0 ,10.0 + 8.0 + 4.0 ,not flip_y_ );
|
||
m_auto_detect.Construct(130 + 10.0 ,10.0 + 4.0 + 16.0 ,'Autodetect orientation if not defined' ,not flip_y_ );
|
||
m_path.Construct;
|
||
|
||
add_ctrl(@m_close );
|
||
|
||
m_close.add_item ('Close' );
|
||
m_close.add_item ('Close CW' );
|
||
m_close.add_item ('Close CCW' );
|
||
m_close.cur_item_(0 );
|
||
|
||
add_ctrl(@m_width );
|
||
|
||
m_width.range_(-100.0 ,100.0 );
|
||
m_width.value_(0.0 );
|
||
m_width.label_('Width=%1.2f' );
|
||
|
||
add_ctrl(@m_auto_detect );
|
||
|
||
end;
|
||
|
||
{ DESTRUCT }
|
||
destructor the_application.Destruct;
|
||
begin
|
||
inherited Destruct;
|
||
|
||
m_close.Destruct;
|
||
m_width.Destruct;
|
||
m_auto_detect.Destruct;
|
||
m_path.Destruct;
|
||
|
||
end;
|
||
|
||
{ COMPOSE_PATH }
|
||
procedure the_application.compose_path;
|
||
var
|
||
flag : unsigned;
|
||
|
||
begin
|
||
flag:=0;
|
||
|
||
if m_close._cur_item = 1 then
|
||
flag:=path_flags_cw;
|
||
|
||
if m_close._cur_item = 2 then
|
||
flag:=path_flags_ccw;
|
||
|
||
m_path.remove_all;
|
||
|
||
m_path.move_to(28.47 ,6.45 );
|
||
m_path.curve3 (21.58 ,1.12 ,19.82 ,0.29 );
|
||
m_path.curve3 (17.19 ,-0.93 ,14.21 ,-0.93 );
|
||
m_path.curve3 (9.57 ,-0.93 ,6.57 ,2.25 );
|
||
m_path.curve3 (3.56 ,5.42 ,3.56 ,10.60 );
|
||
m_path.curve3 (3.56 ,13.87 ,5.03 ,16.26 );
|
||
m_path.curve3 (7.03 ,19.58 ,11.99 ,22.51 );
|
||
m_path.curve3 (16.94 ,25.44 ,28.47 ,29.64 );
|
||
m_path.line_to(28.47 ,31.40 );
|
||
m_path.curve3 (28.47 ,38.09 ,26.34 ,40.58 );
|
||
m_path.curve3 (24.22 ,43.07 ,20.17 ,43.07 );
|
||
m_path.curve3 (17.09 ,43.07 ,15.28 ,41.41 );
|
||
m_path.curve3 (13.43 ,39.75 ,13.43 ,37.60 );
|
||
m_path.line_to(13.53 ,34.77 );
|
||
m_path.curve3 (13.53 ,32.52 ,12.38 ,31.30 );
|
||
m_path.curve3 (11.23 ,30.08 ,9.38 ,30.08 );
|
||
m_path.curve3 (7.57 ,30.08 ,6.42 ,31.35 );
|
||
m_path.curve3 (5.27 ,32.62 ,5.27 ,34.81 );
|
||
m_path.curve3 (5.27 ,39.01 ,9.57 ,42.53 );
|
||
m_path.curve3 (13.87 ,46.04 ,21.63 ,46.04 );
|
||
m_path.curve3 (27.59 ,46.04 ,31.40 ,44.04 );
|
||
m_path.curve3 (34.28 ,42.53 ,35.64 ,39.31 );
|
||
m_path.curve3 (36.52 ,37.21 ,36.52 ,30.71 );
|
||
m_path.line_to(36.52 ,15.53 );
|
||
m_path.curve3 (36.52 ,9.13 ,36.77 ,7.69 );
|
||
m_path.curve3 (37.01 ,6.25 ,37.57 ,5.76 );
|
||
m_path.curve3 (38.13 ,5.27 ,38.87 ,5.27 );
|
||
m_path.curve3 (39.65 ,5.27 ,40.23 ,5.62 );
|
||
m_path.curve3 (41.26 ,6.25 ,44.19 ,9.18 );
|
||
m_path.line_to(44.19 ,6.45 );
|
||
m_path.curve3 (38.72 ,-0.88 ,33.74 ,-0.88 );
|
||
m_path.curve3 (31.35 ,-0.88 ,29.93 ,0.78 );
|
||
m_path.curve3 (28.52 ,2.44 ,28.47 ,6.45 );
|
||
|
||
m_path.close_polygon(flag );
|
||
|
||
m_path.move_to(28.47 ,9.62 );
|
||
m_path.line_to(28.47 ,26.66 );
|
||
m_path.curve3 (21.09 ,23.73 ,18.95 ,22.51 );
|
||
m_path.curve3 (15.09 ,20.36 ,13.43 ,18.02 );
|
||
m_path.curve3 (11.77 ,15.67 ,11.77 ,12.89 );
|
||
m_path.curve3 (11.77 ,9.38 ,13.87 ,7.06 );
|
||
m_path.curve3 (15.97 ,4.74 ,18.70 ,4.74 );
|
||
m_path.curve3 (22.41 ,4.74 ,28.47 ,9.62 );
|
||
|
||
m_path.close_polygon(flag );
|
||
|
||
end;
|
||
|
||
{ ON_DRAW }
|
||
procedure the_application.on_draw;
|
||
var
|
||
pixf : pixel_formats;
|
||
renb : renderer_base;
|
||
ren : renderer_scanline_aa_solid;
|
||
rgba : aggclr;
|
||
|
||
ras : rasterizer_scanline_aa;
|
||
sl : scanline_p8;
|
||
|
||
mtx : trans_affine;
|
||
tas : trans_affine_scaling;
|
||
tat : trans_affine_translation;
|
||
|
||
trans : conv_transform;
|
||
curve : conv_curve;
|
||
|
||
contour : conv_contour;
|
||
|
||
begin
|
||
// Initialize structures
|
||
pixfmt_bgr24(pixf ,rbuf_window );
|
||
|
||
renb.Construct(@pixf );
|
||
ren.Construct (@renb );
|
||
rgba.ConstrDbl(1 ,1 ,1 );
|
||
renb.clear (@rgba );
|
||
|
||
ras.Construct;
|
||
sl.Construct;
|
||
|
||
// Render
|
||
mtx.Construct;
|
||
|
||
tas.Construct(4.0 );
|
||
mtx.multiply (@tas );
|
||
|
||
tat.Construct(150 ,100 );
|
||
mtx.multiply (@tat );
|
||
|
||
trans.Construct(@m_path ,@mtx );
|
||
curve.Construct(@trans );
|
||
|
||
contour.Construct(@curve );
|
||
|
||
contour.width_ (m_width._value );
|
||
//contour.line_join_ (miter_join );
|
||
//contour.inner_join_ (miter_join );
|
||
//contour.inner_miter_limit_ (4.0 );
|
||
contour.auto_detect_orientation_(m_auto_detect._status );
|
||
|
||
compose_path;
|
||
ras.add_path(@contour );
|
||
|
||
rgba.ConstrDbl(0 ,0 ,0 );
|
||
ren.color_ (@rgba );
|
||
|
||
render_scanlines(@ras ,@sl ,@ren );
|
||
|
||
// Render the controls
|
||
render_ctrl(@ras ,@sl ,@ren ,@m_close );
|
||
render_ctrl(@ras ,@sl ,@ren ,@m_width );
|
||
render_ctrl(@ras ,@sl ,@ren ,@m_auto_detect );
|
||
|
||
// Free AGG resources
|
||
ras.Destruct;
|
||
sl.Destruct;
|
||
|
||
curve.Destruct;
|
||
contour.Destruct;
|
||
|
||
end;
|
||
|
||
{ ON_KEY }
|
||
procedure the_application.on_key;
|
||
begin
|
||
if key = key_f1 then
|
||
message_(
|
||
'One of the converters in AGG is conv_contour. It allows you to extend or shrink '#13 +
|
||
'polygons. Initially, it was implemented to eliminate the "problem of adjacent edges"'#13 +
|
||
'in the SVG Viewer, but it can be very useful in many other applications, for example,'#13 +
|
||
'to change the font weight on the fly. The trick here is that the sign (dilation or '#13 +
|
||
'shrinking) depends on the vertex order - clockwise or counterclockwise. '#13 +
|
||
'In the conv_contour you can control the behavior. Sometimes you need to preserve '#13 +
|
||
'the dilation regardless of the initial orientation, sometimes it should depend '#13 +
|
||
'on the orientation. The glyph <20>a<EFBFBD> has a "hole" whose orientation differs from '#13 +
|
||
'the main contour. To change the "weight" correctly, you need to keep the orientation '#13 +
|
||
'as it is originally defined. If you turn "Autodetect orientation<6F>" on, the glyph will '#13 +
|
||
'be extended or shrinked incorrectly.'#13#13 +
|
||
'How to play with:'#13#13 +
|
||
'The radio buttons control the orientation flad assigned to all polygons.'#13 +
|
||
'"Close" doesn''t add the flag.'#13 +
|
||
'"Close CW" and "Close CCW" add "clockwise" or "counterclockwise" flag respectively.' +
|
||
#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. Contour Tool & Polygon Orientation (F1-Help)' );
|
||
|
||
if app.init(440 ,330 ,0 ) then
|
||
app.run;
|
||
|
||
app.Destruct;
|
||
|
||
END. |