mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-11-04 07:59:43 +01:00
438 lines
9.2 KiB
ObjectPascal
438 lines
9.2 KiB
ObjectPascal
{mac_copy:agg.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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pattern_perspective ;
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uses
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Math ,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_rgb ,
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agg_ctrl ,
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agg_rbox_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_path_storage ,
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agg_conv_transform ,
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agg_trans_affine ,
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agg_trans_bilinear ,
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agg_trans_perspective ,
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agg_span_pattern ,
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agg_span_allocator ,
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agg_image_filters ,
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agg_span_interpolator_linear ,
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agg_span_interpolator_trans ,
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agg_span_image_filter ,
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agg_span_pattern_filter_rgb ,
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interactive_polygon_ ,
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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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var
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g_x1 ,
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g_y1 ,
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g_x2 ,
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g_y2 : double;
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g_rasterizer : rasterizer_scanline_aa;
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g_scanline : scanline_u8;
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type
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the_application = object(platform_support )
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m_quad : interactive_polygon;
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m_trans_type : rbox_ctrl;
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m_test_flag : boolean;
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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_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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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_quad.Construct (4 ,5.0 );
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m_trans_type.Construct(460 ,5.0 ,420 + 170.0 ,60.0 ,not flip_y_ );
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m_test_flag:=false;
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m_trans_type.text_size_ (8 );
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m_trans_type.text_thickness_(1 );
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m_trans_type.add_item ('Affine' );
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m_trans_type.add_item ('Bilinear' );
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m_trans_type.add_item ('Perspective' );
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m_trans_type.cur_item_(2 );
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add_ctrl(@m_trans_type );
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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_quad.Destruct;
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m_trans_type.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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var
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trans_x1 ,trans_y1 ,trans_x2 ,trans_y2 ,dx ,dy : double;
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begin
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g_x1:=-150;
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g_y1:=-150;
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g_x2:=150;
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g_y2:=150;
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trans_x1:=-200;
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trans_y1:=-200;
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trans_x2:=200;
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trans_y2:=200;
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dx:=_width / 2.0 - (trans_x2 + trans_x1 ) / 2.0;
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dy:=_height / 2.0 - (trans_y2 + trans_y1 ) / 2.0;
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m_quad.xn_ptr(0 )^:=Floor(trans_x1 + dx );
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m_quad.yn_ptr(0 )^:=Floor(trans_y1 + dy );
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m_quad.xn_ptr(1 )^:=Floor(trans_x2 + dx );// - 150;
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m_quad.yn_ptr(1 )^:=Floor(trans_y1 + dy );// + 150;
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m_quad.xn_ptr(2 )^:=Floor(trans_x2 + dx );
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m_quad.yn_ptr(2 )^:=Floor(trans_y2 + dy );
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m_quad.xn_ptr(3 )^:=Floor(trans_x1 + dx );
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m_quad.yn_ptr(3 )^:=Floor(trans_y2 + dy );
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end;
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{ ON_DRAW }
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procedure the_application.on_draw;
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const
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subdiv_shift = 2;
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var
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pixf ,pixf_pre : pixel_formats;
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rb ,rb_pre : renderer_base;
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rgba : aggclr;
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r : renderer_scanline_aa_solid;
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sa : span_allocator;
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fi : image_filter_hanning;
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sg : span_image_filter_ptr;
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ri : renderer_scanline_aa;
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wx ,
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wy : wrap_mode_reflect_auto_pow2;
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interpolator : span_interpolator_linear;
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interpsubdiv : span_interpolator_linear_subdiv;
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filter : image_filter;
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tr : trans_affine;
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trb : trans_bilinear;
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trp : trans_perspective23;
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begin
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sg:=NIL;
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// Initialize structures
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pixfmt_bgr24 (pixf ,rbuf_window );
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pixfmt_bgr24_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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r.Construct(@rb );
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if not m_test_flag then
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begin
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rgba.ConstrDbl(1 ,1 ,1 );
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rb.clear (@rgba );
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end;
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if m_trans_type._cur_item = 0 then
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begin
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// For the affine parallelogram transformations we
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// calculate the 4-th (implicit) point of the parallelogram
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m_quad.xn_ptr(3 )^:=m_quad.xn(0 ) + (m_quad.xn(2 ) - m_quad.xn(1 ) );
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m_quad.yn_ptr(3 )^:=m_quad.yn(0 ) + (m_quad.yn(2 ) - m_quad.yn(1 ) );
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end;
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if not m_test_flag then
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begin
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// Render the "quad" tool
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g_rasterizer.add_path(@m_quad );
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rgba.ConstrDbl (0 ,0.3 ,0.5 ,0.6 );
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r.color_ (@rgba );
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render_scanlines(@g_rasterizer ,@g_scanline ,@r );
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// Render the controls
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render_ctrl(@g_rasterizer ,@g_scanline ,@r ,@m_trans_type );
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end;
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// Prepare the polygon to rasterize. Here we need to fill
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// the destination (transformed) polygon.
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g_rasterizer.clip_box(0 ,0 ,_width ,_height );
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g_rasterizer.reset;
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g_rasterizer.move_to_d(m_quad.xn(0 ) ,m_quad.yn(0 ) );
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g_rasterizer.line_to_d(m_quad.xn(1 ) ,m_quad.yn(1 ) );
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g_rasterizer.line_to_d(m_quad.xn(2 ) ,m_quad.yn(2 ) );
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g_rasterizer.line_to_d(m_quad.xn(3 ) ,m_quad.yn(3 ) );
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sa.Construct;
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fi.Construct;
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filter.Construct(@fi );
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// Render
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wx.Construct;
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wy.Construct;
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case m_trans_type._cur_item of
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0 :
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begin
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// Note that we consruct an affine matrix that transforms
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// a parallelogram to a rectangle, i.e., it's inverted.
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// It's actually the same as:
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// tr(g_x1, g_y1, g_x2, g_y2, m_triangle.polygon());
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// tr.invert();
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tr.Construct(parallelo_ptr(m_quad.polygon ) ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
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// Also note that we can use the linear interpolator instead of
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// arbitrary span_interpolator_trans. It works much faster,
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// but the transformations must be linear and parellel.
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interpolator.Construct(@tr );
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sg:=new(
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span_pattern_filter_rgb_2x2_ptr ,
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Construct(
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@sa ,rbuf_img(0 ) ,@interpolator ,@filter ,@wx ,@wy ,bgr_order ) );
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ri.Construct (@rb_pre ,sg );
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render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
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end;
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1 :
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begin
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trb.Construct(m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
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if trb.is_valid then
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begin
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interpolator.Construct(@trb );
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sg:=new(
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span_pattern_filter_rgb_2x2_ptr ,
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Construct(
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@sa ,rbuf_img(0 ) ,@interpolator ,@filter ,@wx ,@wy ,bgr_order ) );
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ri.Construct (@rb_pre ,sg );
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render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
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end;
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end;
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2 :
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begin
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trp.Construct(m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
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if trp.is_valid then
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begin
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interpsubdiv.Construct(@trp );
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sg:=new(
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span_pattern_filter_rgb_2x2_ptr ,
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Construct(
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@sa ,rbuf_img(0 ) ,@interpsubdiv ,@filter ,@wx ,@wy ,bgr_order ) );
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ri.Construct (@rb_pre ,sg );
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render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
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end;
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end;
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end;
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// Free AGG resources
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sa.Destruct;
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filter.Destruct;
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if sg <> NIL then
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dispose(sg ,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_quad.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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var
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buf : array[0..99 ] of char;
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begin
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if flags and mouse_left <> 0 then
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if m_quad.on_mouse_button_down(x ,y ) then
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force_redraw
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else
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begin
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start_timer;
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m_test_flag:=true;
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on_draw;
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on_draw;
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on_draw;
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on_draw;
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sprintf(@buf[0 ] ,'time=%.3f' ,elapsed_time );
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m_test_flag:=false;
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force_redraw;
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message_(@buf[0 ] );
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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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if m_quad.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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'Pattern perspective transformations. Essentially it''s the same as Demo '#13 +
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'"image_perspective", but working with a repeating pattern. Can be used '#13 +
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'for texturing.'#13#13 +
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'How to play with:'#13#13 +
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'Use the left mouse button to move and distort the pattern.'#13 +
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'Click the left mouse outside the pattern to run the performance test.' +
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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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g_x1:=0;
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g_y1:=0;
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g_x2:=0;
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g_y2:=0;
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g_rasterizer.Construct;
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g_scanline.Construct;
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app.Construct(pix_format_bgr24 ,flip_y );
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app.caption_ ('AGG Example. Pattern Perspective Transformations (F1-Help)' );
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img_name:='agg';
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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' 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. 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(600 ,600 ,window_resize ) then
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app.run;
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app.Destruct;
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g_rasterizer.Destruct;
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g_scanline.Destruct;
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END. |