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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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171 lines
3.2 KiB
ObjectPascal
171 lines
3.2 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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component_rendering ;
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uses
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agg_basics ,
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agg_platform_support ,
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agg_slider_ctrl ,
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agg_color ,
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agg_pixfmt ,
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agg_pixfmt_gray ,
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agg_pixfmt_rgb ,
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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_p ,
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agg_render_scanlines ,
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agg_ctrl ,
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agg_ellipse ;
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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_alpha : slider_ctrl_ptr;
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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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new(m_alpha ,Construct(5 ,5 ,320 - 5 ,10 + 5 ,not flip_y ) );
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m_alpha.label_('Alpha=%1.0f' );
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m_alpha.range_(0 ,255 );
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m_alpha.value_(255 );
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add_ctrl(m_alpha );
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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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dispose(m_alpha ,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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pf ,
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pfr ,
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pfg ,
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pfb : pixel_formats;
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rbase ,
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rbr ,
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rbg ,
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rbb : renderer_base;
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r ,
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rr ,
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rg ,
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rb : renderer_scanline_aa_solid;
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ras : rasterizer_scanline_aa;
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sl : scanline_p8;
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rgba ,
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gray : aggclr;
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er ,
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eg ,
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eb : ellipse;
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begin
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// Initialize structures
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pixfmt_bgr24 (pf ,rbuf_window );
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pixfmt_gray8_bgr24r(pfr ,rbuf_window );
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pixfmt_gray8_bgr24g(pfg ,rbuf_window );
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pixfmt_gray8_bgr24b(pfb ,rbuf_window );
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rbase.Construct(@pf );
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rbr.Construct (@pfr );
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rbg.Construct (@pfg );
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rbb.Construct (@pfb );
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r.Construct (@rbase );
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rr.Construct(@rbr );
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rg.Construct(@rbg );
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rb.Construct(@rbb );
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ras.Construct;
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sl.Construct;
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// Setup colors & background
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rgba.ConstrDbl(1 ,1 ,1 );
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gray.ConstrInt(0 ,trunc(m_alpha._value ) );
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rbase.clear(@rgba );
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// Draw ellipses
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er.Construct (_width / 2 - 0.87 * 50 ,_height / 2 - 0.5 * 50 ,100 ,100 ,100 );
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rr.color_ (@gray );
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ras.add_path (@er );
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render_scanlines(@ras ,@sl ,@rr );
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eg.Construct (_width / 2 + 0.87 * 50 ,_height / 2 - 0.5 * 50 ,100 ,100 ,100 );
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rg.color_ (@gray );
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ras.add_path (@eg);
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render_scanlines(@ras ,@sl ,@rg );
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eb.Construct (_width / 2 ,_height / 2 + 50 ,100 ,100 ,100 );
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rb.color_ (@gray );
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ras.add_path (@eb );
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render_scanlines(@ras ,@sl ,@rb );
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// Render control
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render_ctrl(@ras ,@sl ,@r ,m_alpha );
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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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'AGG has a gray-scale renderer that can use any 8-bit color channel '#13 +
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'of an RGB or RGBA frame buffer. Most likely it will be used to draw '#13 +
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'gray-scale images directly in the alpha-channel.' +
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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. Component Rendering (F1-Help)' );
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if app.init(320 ,320 ,0 ) then
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app.run;
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app.Destruct;
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END. |