mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-11-04 10:19:52 +01:00
454 lines
9.0 KiB
ObjectPascal
454 lines
9.0 KiB
ObjectPascal
{target:win}
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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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trans_curve1 ;
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{DEFINE AGG_GRAY8 }
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{$DEFINE AGG_BGR24 }
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{DEFINE AGG_RGB24 }
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{DEFINE AGG_BGRA32 }
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{DEFINE AGG_RGBA32 }
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{DEFINE AGG_ARGB32 }
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{DEFINE AGG_ABGR32 }
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{DEFINE AGG_RGB565 }
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{DEFINE AGG_RGB555 }
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uses
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Windows ,
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agg_basics ,
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agg_platform_support ,
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agg_ctrl ,
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agg_cbox_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_p ,
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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_conv_curve ,
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agg_conv_transform ,
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agg_conv_bspline ,
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agg_conv_segmentator ,
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agg_conv_stroke ,
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agg_font_win32_tt ,
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agg_font_cache_manager ,
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agg_trans_single_path ,
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interactive_polygon_
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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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text_ : PChar =
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'Anti-Grain Geometry is designed as a set of loosely coupled ' +
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'algorithms and class templates united with a common idea, ' +
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'so that all the components can be easily combined. Also, ' +
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'the template based design allows you to replace any part of ' +
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'the library without the necessity to modify a single byte in ' +
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'the existing code. ';
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type
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the_application = object(platform_support )
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m_feng : font_engine_win32_tt_int16;
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m_fman : font_cache_manager;
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m_poly : interactive_polygon;
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m_num_points : slider_ctrl;
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m_close ,
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m_preserve_x_scale ,
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m_fixed_len ,
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m_animate : cbox_ctrl;
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m_dx ,
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m_dy : array[0..5 ] of double;
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m_prev_animate : boolean;
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constructor Construct(dc : HDC; format_ : pix_format_e; flip_y_ : boolean );
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destructor Destruct;
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procedure on_init; virtual;
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procedure on_draw; virtual;
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procedure on_mouse_move (x ,y : int; flags : unsigned ); virtual;
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procedure on_mouse_button_down(x ,y : int; flags : unsigned ); virtual;
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procedure on_mouse_button_up (x ,y : int; flags : unsigned ); virtual;
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procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
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procedure on_ctrl_change; virtual;
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procedure move_point(x ,y ,dx ,dy : double_ptr );
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procedure on_idle; 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_feng.Construct(dc );
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m_fman.Construct(@m_feng );
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m_poly.Construct(6 ,5.0 );
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m_num_points.Construct (5.0 ,5.0 ,340.0 ,12.0 ,not flip_y_ );
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m_close.Construct (350 ,5.0 ,'Close' ,not flip_y_ );
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m_preserve_x_scale.Construct(460 ,5.0 ,'Preserve X scale' ,not flip_y_ );
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m_fixed_len.Construct (350 ,25.0 ,'Fixed Length' ,not flip_y_ );
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m_animate.Construct (460 ,25.0 ,'Animate' ,not flip_y_ );
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m_prev_animate:=false;
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add_ctrl(@m_close );
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add_ctrl(@m_preserve_x_scale );
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add_ctrl(@m_fixed_len );
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add_ctrl(@m_animate );
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m_preserve_x_scale.status_(true );
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m_fixed_len.status_ (true );
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m_num_points.range_(10.0 ,400.0 );
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m_num_points.value_(200.0 );
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m_num_points.label_('Number of intermediate Points = %.3f' );
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add_ctrl(@m_num_points );
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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_poly.Destruct;
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m_num_points.Destruct;
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m_close.Destruct;
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m_preserve_x_scale.Destruct;
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m_fixed_len.Destruct;
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m_animate.Destruct;
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m_feng.Destruct;
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m_fman.Destruct;
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end;
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{ ON_INIT }
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procedure the_application.on_init;
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begin
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m_poly.xn_ptr(0 )^:=50;
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m_poly.yn_ptr(0 )^:=50;
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m_poly.xn_ptr(1 )^:=150 + 20;
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m_poly.yn_ptr(1 )^:=150 - 20;
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m_poly.xn_ptr(2 )^:=250 - 20;
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m_poly.yn_ptr(2 )^:=250 + 20;
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m_poly.xn_ptr(3 )^:=350 + 20;
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m_poly.yn_ptr(3 )^:=350 - 20;
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m_poly.xn_ptr(4 )^:=450 - 20;
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m_poly.yn_ptr(4 )^:=450 + 20;
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m_poly.xn_ptr(5 )^:=550;
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m_poly.yn_ptr(5 )^:=550;
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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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rgba : aggclr;
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rb : renderer_base;
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r : renderer_scanline_aa_solid;
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sl : scanline_p8;
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ras : rasterizer_scanline_aa;
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path : simple_polygon_vertex_source;
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bspline : conv_bspline;
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tcurve : trans_single_path;
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fcurves : conv_curve;
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fsegm : conv_segmentator;
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ftrans : conv_transform;
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x ,y : double;
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p : int8u_ptr;
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glyph : glyph_cache_ptr;
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stroke : conv_stroke;
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begin
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// Initialize structures
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pixfmt(pixf ,rbuf_window );
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rb.Construct(@pixf );
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r.Construct (@rb );
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rgba.ConstrDbl(1 ,1 ,1 );
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rb.clear (@rgba );
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sl.Construct;
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ras.Construct;
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m_poly.close_(m_close._status );
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// Render the text
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path.Construct (m_poly.polygon ,m_poly.num_points ,false ,m_close._status );
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bspline.Construct(@path );
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bspline.interpolation_step_(1.0 / m_num_points._value );
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tcurve.Construct;
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tcurve.add_path (@bspline );
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tcurve.preserve_x_scale_(m_preserve_x_scale._status );
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if m_fixed_len._status then
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tcurve.base_length_(1120 );
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fcurves.Construct(m_fman.path_adaptor );
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fsegm.Construct (@fcurves );
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ftrans.Construct (@fsegm ,@tcurve );
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fsegm.approximation_scale_ (3.0 );
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fcurves.approximation_scale_(2.0 );
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m_feng.height_(40.0 );
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//m_feng.italic_(true );
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if m_feng.create_font('Times New Roman' ,glyph_ren_outline ) then
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begin
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x:=0.0;
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y:=3.0;
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p:=@text_[0 ];
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while p^ <> 0 do
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begin
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glyph:=m_fman.glyph(p^ );
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if glyph <> NIL then
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begin
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if x > tcurve.total_length then
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break;
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m_fman.add_kerning (@x ,@y );
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m_fman.init_embedded_adaptors(glyph ,x ,y );
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if glyph.data_type = glyph_data_outline then
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begin
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ras.reset;
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ras.add_path(@ftrans );
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rgba.ConstrInt(0 ,0 ,0 );
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r.color_ (@rgba );
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render_scanlines(@ras ,@sl ,@r );
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end;
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// increment pen position
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x:=x + glyph.advance_x;
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y:=y + glyph.advance_y;
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end;
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inc(ptrcomp(p ) ,sizeof(int8u ) );
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end;
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end;
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// Render the path curve
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stroke.Construct(@bspline );
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stroke.width_ (2.0 );
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rgba.ConstrInt(170 ,50 ,20 ,100 );
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r.color_ (@rgba );
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ras.add_path (@stroke );
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render_scanlines(@ras ,@sl ,@r );
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// Render the "poly" tool
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rgba.ConstrDbl(0 ,0.3 ,0.5 ,0.3 );
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r.color_ (@rgba );
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ras.add_path (@m_poly );
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render_scanlines(@ras ,@sl ,@r );
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// Render the controls
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render_ctrl(@ras ,@sl ,@r ,@m_close );
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render_ctrl(@ras ,@sl ,@r ,@m_preserve_x_scale );
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render_ctrl(@ras ,@sl ,@r ,@m_fixed_len );
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render_ctrl(@ras ,@sl ,@r ,@m_animate );
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render_ctrl(@ras ,@sl ,@r ,@m_num_points );
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// Free AGG resources
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sl.Destruct;
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ras.Destruct;
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bspline.Destruct;
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tcurve.Destruct;
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fcurves.Destruct;
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fsegm.Destruct;
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stroke.Destruct;
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end;
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{ ON_MOUSE_MOVE }
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procedure the_application.on_mouse_move;
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begin
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if flags and mouse_left <> 0 then
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if m_poly.on_mouse_move(x ,y ) then
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force_redraw;
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if flags and mouse_left = 0 then
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on_mouse_button_up(x ,y ,flags );
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end;
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{ ON_MOUSE_BUTTON_DOWN }
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procedure the_application.on_mouse_button_down;
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begin
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if flags and mouse_left <> 0 then
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if m_poly.on_mouse_button_down(x ,y ) then
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force_redraw;
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end;
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{ ON_MOUSE_BUTTON_UP }
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procedure the_application.on_mouse_button_up;
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begin
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if m_poly.on_mouse_button_up(x ,y ) then
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force_redraw;
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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 a "kinda-cool-stuff" demo that performs non-linear transformations and '#13 +
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'draws vector text along a curve. Note that it''s not just calculating of the glyph '#13 +
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'angles and positions, they are transformed as if they were elastic. The curve is '#13 +
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'calculated as a bicubic spline. The option "Preserve X scale" makes the converter '#13 +
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'distribute all the points uniformly along the curve. If it''s unchechked, the scale '#13 +
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'will be proportional to the distance between the control points.' +
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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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{ ON_CTRL_CHANGE }
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procedure the_application.on_ctrl_change;
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var
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i : int;
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begin
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if m_animate._status <> m_prev_animate then
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begin
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if m_animate._status then
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begin
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on_init;
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for i:=0 to 5 do
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begin
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m_dx[i ]:=((Random($7fff ) mod 1000 ) - 500 ) * 0.01;
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m_dy[i ]:=((Random($7fff ) mod 1000 ) - 500 ) * 0.01;
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end;
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wait_mode_(false );
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end
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else
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wait_mode_(true );
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m_prev_animate:=m_animate._status;
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end;
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end;
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{ MOVE_POINT }
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procedure the_application.move_point;
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begin
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if x^ < 0.0 then
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begin
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x^ :=0.0;
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dx^:=-dx^;
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end;
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if x^ > _width then
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begin
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x^ :=_width;
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dx^:=-dx^;
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end;
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if y^ < 0.0 then
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begin
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y^ :=0.0;
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dy^:=-dy^;
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end;
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if y^ > _height then
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begin
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y^ :=_height;
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dy^:=-dy^;
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end;
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x^:=x^ + dx^;
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y^:=y^ + dy^;
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end;
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{ ON_IDLE }
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procedure the_application.on_idle;
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var
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i : int;
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begin
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for i:=0 to 5 do
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move_point(m_poly.xn_ptr(i ) ,m_poly.yn_ptr(i ) ,@m_dx[i ] ,@m_dy[i ] );
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force_redraw;
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end;
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VAR
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app : the_application;
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dc : HDC;
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BEGIN
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dc:=GetDC(0 );
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app.Construct(dc ,pix_format ,flip_y );
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app.caption_ ('AGG Example. Non-linear "Along-A-Curve" Transformer - Win32 (F1-Help)' );
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if app.init(600 ,600 ,window_resize ) then
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app.run;
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app.Destruct;
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ReleaseDC(0 ,dc );
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END. |