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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
bspline ;
{DEFINE AGG_GRAY8 }
{$DEFINE AGG_BGR24 }
{DEFINE AGG_RGB24 }
{DEFINE AGG_BGRA32 }
{DEFINE AGG_RGBA32 }
{DEFINE AGG_ARGB32 }
{DEFINE AGG_ABGR32 }
{DEFINE AGG_RGB565 }
{DEFINE AGG_RGB555 }
uses
agg_basics ,
agg_platform_support ,
agg_ctrl ,
agg_slider_ctrl ,
agg_cbox_ctrl ,
agg_rasterizer_scanline_aa ,
agg_scanline ,
agg_scanline_p ,
agg_renderer_base ,
agg_renderer_scanline ,
agg_render_scanlines ,
agg_conv_bspline ,
agg_conv_stroke ,
interactive_polygon_
{$I pixel_formats.inc }
{$I agg_mode.inc }
const
flip_y = true;
type
the_application = object(platform_support )
m_poly : interactive_polygon;
m_num_points : slider_ctrl;
m_close : cbox_ctrl;
m_flip : int;
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_key(x ,y : int; key ,flags : unsigned ); virtual;
end;
{ CONSTRUCT }
constructor the_application.Construct;
begin
inherited Construct(format_ ,flip_y_ );
m_poly.Construct(6 ,5.0 );
m_num_points.Construct(5.0 ,5.0 ,340.0 ,12.0 ,not flip_y_ );
m_close.Construct (350 ,5.0 ,'Close' ,not flip_y_ );
m_flip:=0;
add_ctrl(@m_close );
m_num_points.range_(1.0 ,40.0 );
m_num_points.value_(20.0 );
m_num_points.label_('Number of intermediate Points = %.3f' );
add_ctrl(@m_num_points );
end;
{ DESTRUCT }
destructor the_application.Destruct;
begin
inherited Destruct;
m_num_points.Destruct;
m_close.Destruct;
m_poly.Destruct;
end;
{ ON_INIT }
procedure the_application.on_init;
begin
if m_flip <> 0 then
begin
m_poly.xn_ptr(0 )^:=100;
m_poly.yn_ptr(0 )^:=_height - 100;
m_poly.xn_ptr(1 )^:=_width - 100;
m_poly.yn_ptr(1 )^:=_height - 100;
m_poly.xn_ptr(2 )^:=_width - 100;
m_poly.yn_ptr(2 )^:=100;
m_poly.xn_ptr(3 )^:=100;
m_poly.yn_ptr(3 )^:=100;
end
else
begin
m_poly.xn_ptr(0 )^:=100;
m_poly.yn_ptr(0 )^:=100;
m_poly.xn_ptr(1 )^:=_width - 100;
m_poly.yn_ptr(1 )^:=100;
m_poly.xn_ptr(2 )^:=_width - 100;
m_poly.yn_ptr(2 )^:=_height - 100;
m_poly.xn_ptr(3 )^:=100;
m_poly.yn_ptr(3 )^:=_height - 100;
end;
m_poly.xn_ptr(4 )^:=_width / 2;
m_poly.yn_ptr(4 )^:=_height / 2;
m_poly.xn_ptr(5 )^:=_width / 2;
m_poly.yn_ptr(5 )^:=_height / 3;
end;
{ ON_DRAW }
procedure the_application.on_draw;
var
pixf : pixel_formats;
rb : renderer_base;
r : renderer_scanline_aa_solid;
sl : scanline_p8;
ras : rasterizer_scanline_aa;
rgba : aggclr;
path : simple_polygon_vertex_source;
bspline : conv_bspline;
stroke : conv_stroke;
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;
// Draw
path.Construct(m_poly.polygon ,m_poly.num_points ,false ,m_close._status );
bspline.Construct (@path );
bspline.interpolation_step_(1.0 / m_num_points._value );
stroke.Construct(@bspline );
stroke.width_ (2.0 );
rgba.ConstrDbl(0 ,0 ,0 );
r.color_ (@rgba );
ras.add_path(@stroke );
render_scanlines(@ras ,@sl ,@r );
// Render the "poly" tool
rgba.ConstrDbl(0 ,0.3 ,0.5 ,0.6 );
r.color_ (@rgba );
ras.add_path(@m_poly );
render_scanlines(@ras ,@sl ,@r );
// Render the controls
render_ctrl(@ras ,@sl ,@r ,@m_close );
render_ctrl(@ras ,@sl ,@r ,@m_num_points );
// Free AGG resources
ras.Destruct;
sl.Destruct;
stroke.Destruct;
bspline.Destruct;
path.Destruct;
end;
{ ON_MOUSE_MOVE }
procedure the_application.on_mouse_move;
begin
if flags and mouse_left <> 0 then
if m_poly.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_poly.on_mouse_button_down(x ,y ) then
force_redraw;
end;
{ ON_MOUSE_BUTTON_UP }
procedure the_application.on_mouse_button_up;
begin
if m_poly.on_mouse_button_up(x ,y ) then
force_redraw;
end;
{ ON_KEY }
procedure the_application.on_key;
begin
if key = unsigned(' ' ) then
begin
m_flip:=m_flip xor 1;
on_init;
force_redraw;
end;
if key = key_f1 then
message_(
'Demostration of a very simple class of Bi-cubic Spline interpolation.'#13 +
'The class supports extrapolation which is a simple linear function. '#13#13 +
'How to play with:'#13#13 +
'Use the mouse to change curve''s shape.'#13 +
'Press the spacebar to flip the curve. ' +
#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. BSpline Interpolator(F1-Help)' );
if app.init(600 ,600 ,window_resize ) then
app.run;
app.Destruct;
END.
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