mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-11-04 10:19:52 +01:00
635 lines
14 KiB
ObjectPascal
635 lines
14 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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image_transforms ;
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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_color ,
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agg_pixfmt ,
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agg_pixfmt_rgba ,
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agg_ctrl ,
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agg_cbox_ctrl ,
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agg_rbox_ctrl ,
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agg_slider_ctrl ,
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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_rasterizer_scanline_aa ,
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agg_scanline ,
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agg_scanline_u ,
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agg_render_scanlines ,
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agg_ellipse ,
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agg_path_storage ,
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agg_trans_affine ,
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agg_conv_transform ,
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agg_conv_stroke ,
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agg_image_filters ,
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agg_span_allocator ,
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agg_span_image_filter ,
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agg_span_image_filter_rgba ,
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agg_span_interpolator_linear ,
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file_utils_ ;
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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_polygon_angle ,
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m_polygon_scale ,
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m_image_angle ,
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m_image_scale : slider_ctrl;
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m_rotate_polygon ,
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m_rotate_image : cbox_ctrl;
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m_example : rbox_ctrl;
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m_image_center_x ,
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m_image_center_y ,
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m_polygon_cx ,
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m_polygon_cy ,
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m_image_cx ,
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m_image_cy ,
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m_dx ,
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m_dy : double;
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m_flag : int;
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constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
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destructor Destruct;
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procedure create_star(ps : path_storage_ptr );
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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_ctrl_change; virtual;
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procedure on_idle; 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_polygon_angle.Construct (5 ,5 ,145 ,11 ,not flip_y_ );
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m_polygon_scale.Construct (5 ,5 + 14 ,145 ,12 + 14 ,not flip_y_ );
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m_image_angle.Construct (155 ,5 ,300 ,12 ,not flip_y_ );
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m_image_scale.Construct (155 ,5 + 14 ,300 ,12 + 14 ,not flip_y_ );
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m_rotate_polygon.Construct(5 ,5 + 14 + 14 ,'Rotate Polygon' ,not flip_y_ );
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m_rotate_image.Construct (5 ,5 + 14 + 14 + 14 ,'Rotate Image' ,not flip_y_ );
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m_example.Construct (-3.0 ,14 + 14 + 14 + 14 ,-3.0 ,14 + 14 + 14 + 14 ,not flip_y_ );
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m_flag:=0;
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add_ctrl(@m_polygon_angle );
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add_ctrl(@m_polygon_scale );
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add_ctrl(@m_image_angle );
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add_ctrl(@m_image_scale );
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add_ctrl(@m_rotate_polygon );
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add_ctrl(@m_rotate_image );
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add_ctrl(@m_example );
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m_polygon_angle.label_('Polygon Angle=%3.2f' );
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m_polygon_scale.label_('Polygon Scale=%3.2f' );
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m_polygon_angle.range_(-180.0 ,180.0 );
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m_polygon_scale.range_(0.1 ,5.0 );
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m_polygon_scale.value_(1.0 );
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m_image_angle.label_('Image Angle=%3.2f' );
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m_image_scale.label_('Image Scale=%3.2f' );
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m_image_angle.range_(-180.0, 180.0);
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m_image_scale.range_(0.1 ,5.0 );
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m_image_scale.value_(1.0 );
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m_example.add_item ('0' );
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m_example.add_item ('1' );
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m_example.add_item ('2' );
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m_example.add_item ('3' );
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m_example.add_item ('4' );
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m_example.add_item ('5' );
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m_example.add_item ('6' );
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m_example.cur_item_(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_polygon_angle.Destruct;
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m_polygon_scale.Destruct;
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m_image_angle.Destruct;
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m_image_scale.Destruct;
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m_rotate_polygon.Destruct;
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m_rotate_image.Destruct;
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m_example.Destruct;
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end;
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{ CREATE_STAR }
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procedure the_application.create_star;
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var
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r ,r1 ,r2 ,a ,dx ,dy : double;
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nr ,i : unsigned;
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begin
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r:=_initial_width;
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if _initial_height < r then
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r:=_initial_height;
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r1:=r / 3 - 8.0;
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r2:=r1 / 1.45;
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nr:=14;
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for i:=0 to nr - 1 do
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begin
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a :=pi * 2.0 * i / nr - pi / 2.0;
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dx:=Cos(a );
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dy:=Sin(a );
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if i and 1 <> 0 then
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ps.line_to(m_polygon_cx + dx * r1 ,m_polygon_cy + dy * r1 )
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else
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if i <> 0 then
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ps.line_to(m_polygon_cx + dx * r2 ,m_polygon_cy + dy * r2 )
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else
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ps.move_to(m_polygon_cx + dx * r2 ,m_polygon_cy + dy * r2 );
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end;
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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_image_center_x:=_initial_width / 2.0;
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m_image_center_y:=_initial_height / 2.0;
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m_polygon_cx:=_initial_width / 2.0;
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m_image_cx :=m_polygon_cx;
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m_polygon_cy:=_initial_height / 2.0;
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m_image_cy :=m_polygon_cy;
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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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rs : renderer_scanline_aa_solid;
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pf : rasterizer_scanline_aa;
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sl : scanline_u8;
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ps : path_storage;
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tr : conv_transform;
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e1 ,
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e2 : ellipse;
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c1 : conv_stroke;
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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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fi : image_filter_base_ptr;
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filter : image_filter_ptr;
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interpolator : span_interpolator_linear;
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image_mtx ,polygon_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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begin
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sg:=NIL;
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fi:=NIL;
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filter:=NIL;
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// Initialize structures
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pixfmt_bgra32(pixf ,rbuf_window );
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rb.Construct(@pixf );
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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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image_mtx.Construct;
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polygon_mtx.Construct;
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tat.Construct(-m_polygon_cx ,-m_polygon_cy ); polygon_mtx.multiply(@tat );
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tar.Construct(m_polygon_angle._value * pi / 180.0 ); polygon_mtx.multiply(@tar );
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tas.Construct(m_polygon_scale._value ); polygon_mtx.multiply(@tas );
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tat.construct(m_polygon_cx ,m_polygon_cy ); polygon_mtx.multiply(@tat );
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case m_example._cur_item of
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// --------------(Example 1)
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1 :
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begin
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tat.Construct(-m_image_center_x ,-m_image_center_y ); image_mtx.multiply(@tat );
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tar.Construct(m_polygon_angle._value * pi / 180.0 ); image_mtx.multiply(@tar );
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tas.Construct(m_polygon_scale._value ); image_mtx.multiply(@tas );
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tat.Construct(m_polygon_cx ,m_polygon_cy ); image_mtx.multiply(@tat );
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image_mtx.invert;
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end;
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// --------------(Example 2)
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2 :
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begin
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tat.Construct(-m_image_center_x ,-m_image_center_y ); image_mtx.multiply(@tat );
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tar.Construct(m_image_angle._value * pi / 180.0 ); image_mtx.multiply(@tar );
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tas.Construct(m_image_scale._value ); image_mtx.multiply(@tas );
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tat.Construct(m_image_cx ,m_image_cy ); image_mtx.multiply(@tat );
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image_mtx.invert;
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end;
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// --------------(Example 3)
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3 :
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begin
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tat.Construct(-m_image_center_x ,-m_image_center_y ); image_mtx.multiply(@tat );
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tar.Construct(m_image_angle._value * pi / 180.0 ); image_mtx.multiply(@tar );
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tas.Construct(m_image_scale._value ); image_mtx.multiply(@tas );
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tat.Construct(m_polygon_cx ,m_polygon_cy ); image_mtx.multiply(@tat );
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image_mtx.invert;
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end;
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// --------------(Example 4)
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4 :
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begin
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tat.Construct(-m_image_cx ,-m_image_cy ); image_mtx.multiply(@tat );
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tar.Construct(m_polygon_angle._value * pi / 180.0 ); image_mtx.multiply(@tar );
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tas.Construct(m_polygon_scale._value ); image_mtx.multiply(@tas );
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tat.Construct(m_polygon_cx ,m_polygon_cy ); image_mtx.multiply(@tat );
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image_mtx.invert;
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end;
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// --------------(Example 5)
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5 :
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begin
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tat.Construct(-m_image_center_x ,-m_image_center_y ); image_mtx.multiply(@tat );
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tar.Construct(m_image_angle._value * pi / 180.0 ); image_mtx.multiply(@tar );
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tar.Construct(m_polygon_angle._value * pi / 180.0 ); image_mtx.multiply(@tar );
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tas.Construct(m_image_scale._value ); image_mtx.multiply(@tas );
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tas.Construct(m_polygon_scale._value ); image_mtx.multiply(@tas );
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tat.Construct(m_image_cx ,m_image_cy ); image_mtx.multiply(@tat );
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image_mtx.invert;
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end;
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// --------------(Example 6)
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6 :
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begin
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tat.Construct(-m_image_cx ,-m_image_cy ); image_mtx.multiply(@tat );
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tar.Construct(m_image_angle._value * pi / 180.0 ); image_mtx.multiply(@tar );
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tas.Construct(m_image_scale._value ); image_mtx.multiply(@tas );
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tat.Construct(m_image_cx ,m_image_cy ); image_mtx.multiply(@tat );
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image_mtx.invert;
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end;
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// --------------(Example 0, Identity matrix)
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else
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NoP;
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end;
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interpolator.Construct(@image_mtx );
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sa.Construct;
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rgba.ConstrDbl(1 ,1 ,1 ,0 );
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// nearest neighbor
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{ sg:=new(
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span_image_filter_rgba_nn_ptr ,
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Construct(
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@sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,bgra_order ) );{}
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// "hardcoded" bilinear filter
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sg:=new(
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span_image_filter_rgba_bilinear_ptr ,
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Construct(
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@sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,bgra_order ) );{}
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// arbitrary filter
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{ fi :=new(image_filter_spline36_ptr ,Construct );
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filter:=new(image_filter_ptr ,Construct(fi ) );
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sg:=new(
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span_image_filter_rgba_ptr ,
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Construct(
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@sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,filter ,bgra_order ) );{}
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// Render
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ri.Construct(@rb ,sg );
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pf.Construct;
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sl.Construct;
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ps.Construct;
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create_star(@ps );
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tr.Construct(@ps ,@polygon_mtx );
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pf.add_path (@tr );
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render_scanlines(@pf ,@sl ,@ri );
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e1.Construct(m_image_cx ,m_image_cy ,5 ,5 ,20 );
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e2.Construct(m_image_cx ,m_image_cy ,2 ,2 ,20 );
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c1.Construct(@e1 );
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rgba.ConstrDbl (0.7 ,0.8 ,0 );
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rs.color_ (@rgba );
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pf.add_path (@e1);
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render_scanlines(@pf ,@sl ,@rs );
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rgba.ConstrDbl (0 ,0 ,0 );
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rs.color_ (@rgba );
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pf.add_path (@c1 );
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render_scanlines(@pf ,@sl ,@rs );
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pf.add_path (@e2 );
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render_scanlines(@pf ,@sl ,@rs );
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// Render the controls
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render_ctrl(@pf ,@sl ,@rs ,@m_polygon_angle );
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render_ctrl(@pf ,@sl ,@rs ,@m_polygon_scale );
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render_ctrl(@pf ,@sl ,@rs ,@m_image_angle );
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render_ctrl(@pf ,@sl ,@rs ,@m_image_scale );
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render_ctrl(@pf ,@sl ,@rs ,@m_rotate_polygon );
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render_ctrl(@pf ,@sl ,@rs ,@m_rotate_image );
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render_ctrl(@pf ,@sl ,@rs ,@m_example );
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// Free AGG resources
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pf.Destruct;
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sl.Destruct;
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ps.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 fi <> NIL then
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dispose(fi );
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if filter <> NIL then
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dispose(filter ,Destruct );
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c1.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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begin
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if m_flag = 1 then
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begin
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m_image_cx:=x - m_dx;
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m_image_cy:=y - m_dy;
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force_redraw;
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end;
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if m_flag = 2 then
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begin
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m_polygon_cx:=x - m_dx;
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m_polygon_cy:=y - m_dy;
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force_redraw;
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end;
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end
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else
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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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var
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pf : rasterizer_scanline_aa;
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ps : path_storage;
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tr : conv_transform;
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polygon_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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begin
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if flags and mouse_left <> 0 then
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if Sqrt(
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(x - m_image_cx ) * (x - m_image_cx ) +
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(y - m_image_cy ) * (y - m_image_cy ) ) < 5.0 then
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begin
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m_dx:=x - m_image_cx;
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m_dy:=y - m_image_cy;
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m_flag:=1;
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end
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else
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begin
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pf.Construct;
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polygon_mtx.Construct;
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tat.Construct(-m_polygon_cx ,-m_polygon_cy ); polygon_mtx.multiply(@tat );
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tar.Construct(m_polygon_angle._value * pi / 180.0 ); polygon_mtx.multiply(@tar );
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tas.Construct(m_polygon_scale._value ,m_polygon_scale._value ); polygon_mtx.multiply(@tas );
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tat.Construct(m_polygon_cx ,m_polygon_cy ); polygon_mtx.multiply(@tat );
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ps.Construct;
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create_star(@ps );
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tr.Construct(@ps ,@polygon_mtx );
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pf.add_path (@tr );
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if pf.hit_test(x ,y ) then
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begin
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m_dx:=x - m_polygon_cx;
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m_dy:=y - m_polygon_cy;
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m_flag:=2;
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end;
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pf.Destruct;
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ps.Destruct;
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end;
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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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m_flag:=0;
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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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begin
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if m_rotate_polygon._status or
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m_rotate_image._status then
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wait_mode_(false )
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else
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wait_mode_(true );
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force_redraw;
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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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redraw : boolean;
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begin
|
|
redraw:=false;
|
|
|
|
if m_rotate_polygon._status then
|
|
begin
|
|
m_polygon_angle.value_(m_polygon_angle._value + 0.5 );
|
|
|
|
if m_polygon_angle._value >= 180.0 then
|
|
m_polygon_angle.value_(m_polygon_angle._value - 360.0 );
|
|
|
|
redraw:=true;
|
|
|
|
end;
|
|
|
|
if m_rotate_image._status then
|
|
begin
|
|
m_image_angle.value_(m_image_angle._value + 0.5 );
|
|
|
|
if m_image_angle._value >= 180.0 then
|
|
m_image_angle.value_(m_image_angle._value - 360.0 );
|
|
|
|
redraw:=true;
|
|
|
|
end;
|
|
|
|
if redraw then
|
|
force_redraw;
|
|
|
|
end;
|
|
|
|
{ ON_KEY }
|
|
procedure the_application.on_key;
|
|
begin
|
|
if key = key_f1 then
|
|
message_(
|
|
'Affine transformations of the images. The examples demonstrates how to construct '#13 +
|
|
'the affine transformer matrix for different cases. '#13 +
|
|
'See the "image_transforms.txt" file for details. '#13 +
|
|
'Now there are methods in trans_affine that allow you to construct transformations '#13 +
|
|
'from an arbitrary parallelogram to another parallelogram. It''s very convenient and easy.'#13#13 +
|
|
'How to play with:'#13#13 +
|
|
'Use the left mouse button change the centre of rotation or move the polygon shape.' +
|
|
#13#13'Note: F2 key saves current "screenshot" file in this demo''s directory. ' );
|
|
|
|
end;
|
|
|
|
VAR
|
|
app : the_application;
|
|
buf : array [0..255 ] of char;
|
|
ext : string[10 ];
|
|
|
|
img_name ,p ,n ,x : shortstring;
|
|
|
|
BEGIN
|
|
app.Construct(pix_format_bgra32 ,flip_y );
|
|
app.caption_ ('Image Affine Transformations with filtering (F1-Help)' );
|
|
|
|
img_name:='spheres';
|
|
|
|
{$IFDEF WIN32 }
|
|
if ParamCount > 0 then
|
|
begin
|
|
spread_name(ParamStr(1 ) ,p ,n ,x );
|
|
|
|
img_name:=fold_name(p ,n ,'' );
|
|
|
|
end;
|
|
|
|
{$ENDIF }
|
|
|
|
if not app.load_img(0 ,img_name ) then
|
|
begin
|
|
img_name:=img_name + #0;
|
|
ext :=app._img_ext + #0;
|
|
|
|
if img_name = 'spheres'#0 then
|
|
begin
|
|
sprintf(@buf[0 ] ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
|
|
sprintf(@buf[StrLen(@buf ) ] ,'%s. '#13'Download http://www.antigrain.com/' ,ptrcomp(@ext[1 ] ) );
|
|
sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@img_name[1 ] ) );
|
|
sprintf(@buf[StrLen(@buf ) ] ,'%s'#13'or copy it from another directory if available.' ,ptrcomp(@ext[1 ] ) );
|
|
|
|
end
|
|
else
|
|
begin
|
|
sprintf(@buf[0 ] ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
|
|
sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@ext[1 ] ) );
|
|
|
|
end;
|
|
|
|
app.message_(@buf[0 ] );
|
|
|
|
end
|
|
else
|
|
if app.init(app.rbuf_img(0 )._width ,app.rbuf_img(0 )._height ,0 ) then
|
|
app.run;
|
|
|
|
app.Destruct;
|
|
|
|
END. |