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

324 lines
6.4 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
trans_polar_ ;
uses
agg_basics ,
agg_platform_support ,
agg_color ,
agg_pixfmt ,
agg_pixfmt_rgb ,
agg_ctrl ,
agg_slider_ctrl ,
agg_cbox_ctrl ,
agg_renderer_base ,
agg_renderer_scanline ,
agg_rasterizer_scanline_aa ,
agg_scanline_u ,
agg_render_scanlines ,
agg_conv_transform ,
agg_conv_segmentator ,
agg_vertex_source ,
agg_trans_affine ;
{$I agg_mode.inc }
const
flip_y = true;
type
transformed_control = object(ctrl )
m_ctrl : ctrl_ptr;
m_pipeline : vertex_source_ptr;
constructor Construct(ctrl : ctrl_ptr; pl : vertex_source_ptr );
function num_paths : unsigned; virtual;
procedure rewind(path_id : unsigned ); virtual;
function vertex(x ,y : double_ptr ) : unsigned; virtual;
function _color(i : unsigned ) : aggclr_ptr; virtual;
end;
trans_polar_ptr = ^trans_polar;
trans_polar = object(trans_affine )
m_base_angle ,
m_base_scale ,
m_base_x ,
m_base_y ,
m_translation_x ,
m_translation_y ,
m_spiral : double;
constructor Construct;
procedure base_scale (v : double );
procedure full_circle(v : double );
procedure base_offset(dx ,dy : double );
procedure translation(dx ,dy : double );
procedure spiral (v : double );
end;
the_application = object(platform_support )
m_slider1 ,
m_slider_spiral ,
m_slider_base_y : slider_ctrl;
constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
destructor Destruct;
procedure on_draw; virtual;
procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
end;
{ CONSTRUCT }
constructor transformed_control.Construct;
begin
m_ctrl :=ctrl;
m_pipeline:=pl;
end;
{ NUM_PATHS }
function transformed_control.num_paths;
begin
result:=m_ctrl.num_paths;
end;
{ REWIND }
procedure transformed_control.rewind;
begin
m_pipeline.rewind(path_id );
end;
{ VERTEX }
function transformed_control.vertex;
begin
result:=m_pipeline.vertex(x ,y );
end;
{ _COLOR }
function transformed_control._color;
begin
result:=m_ctrl._color(i );
end;
{ trans_polar_transform }
procedure trans_polar_transform(this : trans_polar_ptr; x ,y : double_ptr );
var
x1 ,y1 : double;
begin
x1:=(x^ + this.m_base_x ) * this.m_base_angle;
y1:=(y^ + this.m_base_y ) * this.m_base_scale + (x^ * this.m_spiral );
x^:=Cos(x1 ) * y1 + this.m_translation_x;
y^:=Sin(x1 ) * y1 + this.m_translation_y;
end;
{ CONSTRUCT }
constructor trans_polar.Construct;
begin
inherited Construct;
m_base_angle:=1.0;
m_base_scale:=1.0;
m_base_x:=0.0;
m_base_y:=0.0;
m_translation_x:=0.0;
m_translation_y:=0.0;
m_spiral:=0.0;
transform:=@trans_polar_transform;
end;
{ BASE_SCALE }
procedure trans_polar.base_scale;
begin
m_base_scale:=v;
end;
{ FULL_CIRCLE }
procedure trans_polar.full_circle;
begin
m_base_angle:=2.0 * pi / v;
end;
{ BASE_OFFSET }
procedure trans_polar.base_offset;
begin
m_base_x:=dx;
m_base_y:=dy;
end;
{ TRANSLATION }
procedure trans_polar.translation;
begin
m_translation_x:=dx;
m_translation_y:=dy;
end;
{ SPIRAL }
procedure trans_polar.spiral;
begin
m_spiral:=v;
end;
{ CONSTRUCT }
constructor the_application.Construct;
begin
inherited Construct(format_ ,flip_y_ );
m_slider1.Construct (10 ,10 ,600 - 10 ,17 ,not flip_y_ );
m_slider_spiral.Construct(10 ,10 + 20 ,600 - 10 ,17 + 20 ,not flip_y_ );
m_slider_base_y.Construct(10 ,10 + 40 ,600 - 10 ,17 + 40 ,not flip_y_ );
add_ctrl(@m_slider1 );
m_slider1.range_ (0.0 ,100.0 );
m_slider1.num_steps_(5 );
m_slider1.value_ (32.0);
m_slider1.label_ ('Some Value=%1.0f' );
add_ctrl(@m_slider_spiral );
m_slider_spiral.label_('Spiral=%.3f' );
m_slider_spiral.range_(-0.1 ,0.1 );
m_slider_spiral.value_(0.0 );
add_ctrl(@m_slider_base_y );
m_slider_base_y.label_('Base Y=%.3f' );
m_slider_base_y.range_(50.0 ,200.0 );
m_slider_base_y.value_(120.0 );
end;
{ DESTRUCT }
destructor the_application.Destruct;
begin
inherited Destruct;
m_slider1.Destruct;
m_slider_spiral.Destruct;
m_slider_base_y.Destruct;
end;
{ ON_DRAW }
procedure the_application.on_draw;
var
pixf : pixel_formats;
rb : renderer_base;
ren : renderer_scanline_aa_solid;
ras : rasterizer_scanline_aa;
sl : scanline_u8;
rgba : aggclr;
trans : trans_polar;
segm : conv_segmentator;
pipeline : conv_transform;
ctrl : transformed_control;
begin
// Initialize structures
pixfmt_bgr24(pixf ,rbuf_window );
rb.Construct (@pixf );
ren.Construct(@rb );
rgba.ConstrDbl(1 ,1 ,1 );
rb.clear (@rgba );
ras.Construct;
sl.Construct;
// Render the controls
render_ctrl(@ras ,@sl ,@ren ,@m_slider1 );
render_ctrl(@ras ,@sl ,@ren ,@m_slider_spiral );
render_ctrl(@ras ,@sl ,@ren ,@m_slider_base_y );
// Render
trans.Construct;
trans.full_circle(-600 );
trans.base_scale (-1.0 );
trans.base_offset(0.0 ,m_slider_base_y._value );
trans.translation(_width / 2.0 ,_height / 2.0 + 30.0 );
trans.spiral (-m_slider_spiral._value );
segm.Construct (@m_slider1 );
pipeline.Construct(@segm ,@trans );
ctrl.Construct (@m_slider1 ,@pipeline );
render_ctrl(@ras ,@sl ,@ren ,@ctrl );
// Free AGG resources
ras.Destruct;
sl.Destruct;
end;
{ ON_KEY }
procedure the_application.on_key;
begin
if key = key_f1 then
message_(
'Another example of non-linear transformations requested by one of my friends. '#13 +
'Here we render a standard AGG control in its original form (the slider in the '#13 +
'bottom) and after the transformation. The transformer itself is not a part of '#13 +
'AGG and just demonstrates how to write custom transformers (class trans_polar).'#13 +
'Note that because the transformer is non-linear, we need to use conv_segmentator '#13 +
'first. Don''t worry much about the transformed_control class, it''s just an adaptor '#13 +
'used to render the controls with additional transformations.'#13#13 +
'How to play with:'#13#13 +
'Try to drag the value of the slider at the bottom and watch how it''s being '#13 +
'synchronized in the polar coordinates. Also change two other parameters '#13 +
'(Spiral and Base Y) and the size of the window.' +
#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. Polar Transformer (F1-Help)' );
if app.init(600 ,400 ,window_resize ) then
app.run;
app.Destruct;
END.