mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-05-01 04:23:52 +02:00
324 lines
6.4 KiB
ObjectPascal
324 lines
6.4 KiB
ObjectPascal
//
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// AggPas 2.4 RM3 Demo application
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// Note: Press F1 key on run to see more info about this demo
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//
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// Paths: src;src\ctrl;src\svg;src\util;src\platform\win;expat-wrap
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//
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program
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trans_polar_ ;
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uses
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agg_basics ,
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agg_platform_support ,
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agg_color ,
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agg_pixfmt ,
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agg_pixfmt_rgb ,
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agg_ctrl ,
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agg_slider_ctrl ,
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agg_cbox_ctrl ,
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agg_renderer_base ,
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agg_renderer_scanline ,
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agg_rasterizer_scanline_aa ,
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agg_scanline_u ,
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agg_render_scanlines ,
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agg_conv_transform ,
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agg_conv_segmentator ,
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agg_vertex_source ,
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agg_trans_affine ;
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{$I agg_mode.inc }
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const
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flip_y = true;
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type
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transformed_control = object(ctrl )
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m_ctrl : ctrl_ptr;
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m_pipeline : vertex_source_ptr;
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constructor Construct(ctrl : ctrl_ptr; pl : vertex_source_ptr );
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function num_paths : unsigned; virtual;
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procedure rewind(path_id : unsigned ); virtual;
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function vertex(x ,y : double_ptr ) : unsigned; virtual;
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function _color(i : unsigned ) : aggclr_ptr; virtual;
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end;
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trans_polar_ptr = ^trans_polar;
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trans_polar = object(trans_affine )
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m_base_angle ,
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m_base_scale ,
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m_base_x ,
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m_base_y ,
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m_translation_x ,
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m_translation_y ,
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m_spiral : double;
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constructor Construct;
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procedure base_scale (v : double );
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procedure full_circle(v : double );
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procedure base_offset(dx ,dy : double );
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procedure translation(dx ,dy : double );
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procedure spiral (v : double );
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end;
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the_application = object(platform_support )
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m_slider1 ,
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m_slider_spiral ,
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m_slider_base_y : slider_ctrl;
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constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
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destructor Destruct;
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procedure on_draw; virtual;
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procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
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end;
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{ CONSTRUCT }
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constructor transformed_control.Construct;
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begin
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m_ctrl :=ctrl;
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m_pipeline:=pl;
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end;
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{ NUM_PATHS }
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function transformed_control.num_paths;
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begin
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result:=m_ctrl.num_paths;
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end;
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{ REWIND }
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procedure transformed_control.rewind;
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begin
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m_pipeline.rewind(path_id );
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end;
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{ VERTEX }
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function transformed_control.vertex;
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begin
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result:=m_pipeline.vertex(x ,y );
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end;
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{ _COLOR }
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function transformed_control._color;
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begin
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result:=m_ctrl._color(i );
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end;
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{ trans_polar_transform }
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procedure trans_polar_transform(this : trans_polar_ptr; x ,y : double_ptr );
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var
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x1 ,y1 : double;
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begin
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x1:=(x^ + this.m_base_x ) * this.m_base_angle;
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y1:=(y^ + this.m_base_y ) * this.m_base_scale + (x^ * this.m_spiral );
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x^:=Cos(x1 ) * y1 + this.m_translation_x;
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y^:=Sin(x1 ) * y1 + this.m_translation_y;
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end;
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{ CONSTRUCT }
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constructor trans_polar.Construct;
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begin
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inherited Construct;
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m_base_angle:=1.0;
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m_base_scale:=1.0;
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m_base_x:=0.0;
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m_base_y:=0.0;
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m_translation_x:=0.0;
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m_translation_y:=0.0;
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m_spiral:=0.0;
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transform:=@trans_polar_transform;
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end;
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{ BASE_SCALE }
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procedure trans_polar.base_scale;
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begin
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m_base_scale:=v;
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end;
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{ FULL_CIRCLE }
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procedure trans_polar.full_circle;
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begin
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m_base_angle:=2.0 * pi / v;
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end;
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{ BASE_OFFSET }
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procedure trans_polar.base_offset;
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begin
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m_base_x:=dx;
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m_base_y:=dy;
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end;
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{ TRANSLATION }
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procedure trans_polar.translation;
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begin
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m_translation_x:=dx;
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m_translation_y:=dy;
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end;
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{ SPIRAL }
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procedure trans_polar.spiral;
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begin
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m_spiral:=v;
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end;
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{ CONSTRUCT }
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constructor the_application.Construct;
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begin
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inherited Construct(format_ ,flip_y_ );
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m_slider1.Construct (10 ,10 ,600 - 10 ,17 ,not flip_y_ );
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m_slider_spiral.Construct(10 ,10 + 20 ,600 - 10 ,17 + 20 ,not flip_y_ );
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m_slider_base_y.Construct(10 ,10 + 40 ,600 - 10 ,17 + 40 ,not flip_y_ );
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add_ctrl(@m_slider1 );
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m_slider1.range_ (0.0 ,100.0 );
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m_slider1.num_steps_(5 );
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m_slider1.value_ (32.0);
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m_slider1.label_ ('Some Value=%1.0f' );
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add_ctrl(@m_slider_spiral );
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m_slider_spiral.label_('Spiral=%.3f' );
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m_slider_spiral.range_(-0.1 ,0.1 );
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m_slider_spiral.value_(0.0 );
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add_ctrl(@m_slider_base_y );
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m_slider_base_y.label_('Base Y=%.3f' );
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m_slider_base_y.range_(50.0 ,200.0 );
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m_slider_base_y.value_(120.0 );
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end;
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{ DESTRUCT }
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destructor the_application.Destruct;
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begin
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inherited Destruct;
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m_slider1.Destruct;
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m_slider_spiral.Destruct;
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m_slider_base_y.Destruct;
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end;
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{ ON_DRAW }
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procedure the_application.on_draw;
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var
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pixf : pixel_formats;
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rb : renderer_base;
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ren : renderer_scanline_aa_solid;
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ras : rasterizer_scanline_aa;
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sl : scanline_u8;
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rgba : aggclr;
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trans : trans_polar;
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segm : conv_segmentator;
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pipeline : conv_transform;
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ctrl : transformed_control;
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begin
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// Initialize structures
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pixfmt_bgr24(pixf ,rbuf_window );
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rb.Construct (@pixf );
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ren.Construct(@rb );
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rgba.ConstrDbl(1 ,1 ,1 );
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rb.clear (@rgba );
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ras.Construct;
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sl.Construct;
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// Render the controls
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render_ctrl(@ras ,@sl ,@ren ,@m_slider1 );
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render_ctrl(@ras ,@sl ,@ren ,@m_slider_spiral );
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render_ctrl(@ras ,@sl ,@ren ,@m_slider_base_y );
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// Render
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trans.Construct;
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trans.full_circle(-600 );
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trans.base_scale (-1.0 );
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trans.base_offset(0.0 ,m_slider_base_y._value );
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trans.translation(_width / 2.0 ,_height / 2.0 + 30.0 );
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trans.spiral (-m_slider_spiral._value );
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segm.Construct (@m_slider1 );
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pipeline.Construct(@segm ,@trans );
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ctrl.Construct (@m_slider1 ,@pipeline );
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render_ctrl(@ras ,@sl ,@ren ,@ctrl );
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// Free AGG resources
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ras.Destruct;
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sl.Destruct;
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end;
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{ ON_KEY }
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procedure the_application.on_key;
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begin
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if key = key_f1 then
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message_(
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'Another example of non-linear transformations requested by one of my friends. '#13 +
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'Here we render a standard AGG control in its original form (the slider in the '#13 +
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'bottom) and after the transformation. The transformer itself is not a part of '#13 +
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'AGG and just demonstrates how to write custom transformers (class trans_polar).'#13 +
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'Note that because the transformer is non-linear, we need to use conv_segmentator '#13 +
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'first. Don''t worry much about the transformed_control class, it''s just an adaptor '#13 +
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'used to render the controls with additional transformations.'#13#13 +
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'How to play with:'#13#13 +
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'Try to drag the value of the slider at the bottom and watch how it''s being '#13 +
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'synchronized in the polar coordinates. Also change two other parameters '#13 +
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'(Spiral and Base Y) and the size of the window.' +
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#13#13'Note: F2 key saves current "screenshot" file in this demo''s directory. ' );
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end;
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VAR
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app : the_application;
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BEGIN
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app.Construct(pix_format_bgr24 ,flip_y );
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app.caption_ ('AGG Example. Polar Transformer (F1-Help)' );
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if app.init(600 ,400 ,window_resize ) then
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app.run;
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app.Destruct;
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END. |