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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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295 lines
6.3 KiB
ObjectPascal
295 lines
6.3 KiB
ObjectPascal
{mac_copy:spheres.bmp}
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//
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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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image1 ;
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{$DEFINE AGG_BGR24 }
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uses
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SysUtils ,
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agg_basics ,
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agg_platform_support ,
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agg_ctrl ,
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agg_slider_ctrl ,
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agg_rasterizer_scanline_aa ,
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agg_scanline ,
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agg_scanline_u ,
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agg_rendering_buffer ,
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agg_renderer_base ,
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agg_renderer_scanline ,
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agg_render_scanlines ,
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agg_ellipse ,
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agg_trans_affine ,
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agg_conv_transform ,
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agg_span_allocator ,
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agg_span_interpolator_linear ,
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agg_span_image_filter ,
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agg_span_image_filter_rgb ,
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agg_span_image_filter_rgba ,
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agg_span_image_filter_gray ,
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agg_image_filters ,
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file_utils_
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{$I pixel_formats.inc }
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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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the_application = object(platform_support )
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m_angle ,
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m_scale : 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 the_application.Construct;
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begin
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inherited Construct(format_ ,flip_y_ );
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m_angle.Construct(5 ,5 ,300 ,12 ,not flip_y_ );
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m_scale.Construct(5 ,5 + 15 ,300 ,12 + 15 ,not flip_y_ );
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add_ctrl(@m_angle );
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add_ctrl(@m_scale );
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m_angle.label_('Angle=%3.2f' );
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m_scale.label_('Scale=%3.2f' );
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m_angle.range_(-180.0 ,180.0 );
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m_angle.value_(0.0 );
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m_scale.range_(0.1 ,5.0 );
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m_scale.value_(1.0 );
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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_angle.Destruct;
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m_scale.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 ,pixf_pre : pixel_formats;
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rgba : aggclr;
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rb ,rb_pre : renderer_base;
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rs : renderer_scanline_aa_solid;
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pf : rasterizer_scanline_aa;
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sl : scanline_u8;
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sa : span_allocator;
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sg : span_image_filter_ptr;
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ri : renderer_scanline_aa;
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tr : conv_transform;
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fi : image_filter;
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filter : image_filter_base_ptr;
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interpolator : span_interpolator_linear;
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src_mtx ,img_mtx : trans_affine;
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tat : trans_affine_translation;
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tar : trans_affine_rotation;
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tas : trans_affine_scaling;
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ell : ellipse;
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r : double;
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begin
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sg :=NIL;
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filter:=NIL;
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// Initialize structures
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pixfmt (pixf ,rbuf_window );
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pixfmt_pre(pixf_pre ,rbuf_window );
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rb.Construct (@pixf );
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rb_pre.Construct(@pixf_pre );
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rs.Construct (@rb );
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rgba.ConstrDbl(1.0 ,1.0 ,1.0 );
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rb.clear (@rgba );
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pf.Construct;
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sl.Construct;
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// Calc
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src_mtx.Construct;
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tat.Construct(-_initial_width / 2 - 10 ,-_initial_height / 2 - 20 - 10 ); src_mtx.multiply(@tat );
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tar.Construct(m_angle._value * pi / 180.0 ); src_mtx.multiply(@tar );
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tas.Construct(m_scale._value ); src_mtx.multiply(@tas );
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tat.Construct(_initial_width / 2 ,_initial_height / 2 + 20 ); src_mtx.multiply(@tat );
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src_mtx.multiply(_trans_affine_resizing );
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img_mtx.Construct;
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tat.Construct(-_initial_width / 2 + 10 ,-_initial_height / 2 + 20 + 10 ); img_mtx.multiply(@tat );
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tar.Construct(m_angle._value * pi / 180.0 ); img_mtx.multiply(@tar );
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tas.Construct(m_scale._value ); img_mtx.multiply(@tas );
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tat.Construct(_initial_width / 2 ,_initial_height / 2 + 20 ); img_mtx.multiply(@tat );
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img_mtx.multiply(_trans_affine_resizing );
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img_mtx.invert;
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sa.Construct;
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interpolator.Construct(@img_mtx );
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rgba.ConstrPre(0 ,0.4 ,0 ,0.5 );
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// Version without filtering (nearest neighbor)
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{ sg:=new(
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span_image_filter_rgb_nn_ptr ,
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Construct(@sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,component_order ) );{}
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// Version with "hardcoded" bilinear filter
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sg:=new(
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span_image_filter_rgb_bilinear_ptr ,
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Construct(@sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,component_order ) );{}
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// Version with arbitrary filter
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{ filter:=new(image_filter_mitchell_ptr ,Construct );
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fi.Construct(filter );
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sg:=new(
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span_image_filter_rgb_ptr ,
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Construct(@sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,@fi ,component_order ) );{}
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// Render
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ri.Construct(@rb_pre ,sg );
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r:=_initial_width;
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if _initial_height - 60 < r then
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r:=_initial_height - 60;
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ell.Construct(
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_initial_width / 2.0 + 10 ,
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_initial_height / 2.0 + 20 + 10 ,
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r / 2.0 + 16.0 ,
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r / 2.0 + 16.0 ,200 );
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tr.Construct(@ell ,@src_mtx );
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pf.add_path (@tr );
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render_scanlines(@pf ,@sl ,@ri );
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// Render the controls
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render_ctrl(@pf ,@sl ,@rs ,@m_angle );
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render_ctrl(@pf ,@sl ,@rs ,@m_scale );
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// Free AGG resources
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pf.Destruct;
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sl.Destruct;
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sa.Destruct;
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if sg <> NIL then
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dispose(sg ,Destruct );
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if filter <> NIL then
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begin
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dispose(filter );
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fi.Destruct;
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end;
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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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'This is the first example with the new "reincarnation" of the image transformation '#13 +
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'algorithms. The example allows you to rotate and scale the image with respect to '#13 +
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'its center. Also, the image is scaled when resizing the window.'#13#13 +
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'How to play with:'#13#13 +
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'Try to recompile the source code with different image filtering methods.' +
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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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buf : array [0..255 ] of char;
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ext : string[10 ];
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img_name ,p ,n ,x : shortstring;
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BEGIN
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app.Construct(pix_format ,flip_y );
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app.caption_ ('Image Affine Transformations with filtering (F1-Help)' );
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img_name:='spheres';
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{$IFDEF WIN32 }
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if ParamCount > 0 then
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begin
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spread_name(ParamStr(1 ) ,p ,n ,x );
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img_name:=fold_name(p ,n ,'' );
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end;
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{$ENDIF }
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if not app.load_img(0 ,img_name ) then
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begin
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img_name:=img_name + #0;
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ext :=app._img_ext + #0;
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if img_name = 'spheres'#0 then
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begin
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sprintf(@buf[0 ] ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
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sprintf(@buf[StrLen(@buf ) ] ,'%s. '#13'Download http://www.antigrain.com/' ,ptrcomp(@ext[1 ] ) );
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sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@img_name[1 ] ) );
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sprintf(@buf[StrLen(@buf ) ] ,'%s'#13'or copy it from another directory if available.' ,ptrcomp(@ext[1 ] ) );
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end
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else
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begin
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sprintf(@buf[0 ] ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
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sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@ext[1 ] ) );
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end;
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app.message_(@buf[0 ] );
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end
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else
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if app.init(app.rbuf_img(0 )._width + 20 ,app.rbuf_img(0 )._height + 40 + 20 ,window_resize ) then
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app.run;
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app.Destruct;
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END. |