text: #include <math.h>
  #include <stdio.h>
  #include <time.h>
  #include "agg_basics.h"
  #include "agg_rendering_buffer.h"
  #include "agg_conv_transform.h"
  #include "agg_conv_stroke.h"
  #include "agg_conv_clip_polyline.h"
  #include "agg_scanline_p.h"
  #include "agg_renderer_scanline.h"
  #include "agg_rasterizer_outline_aa.h"
  #include "agg_rasterizer_scanline_aa.h"
  #include "agg_pattern_filters_rgba.h"
  #include "agg_renderer_outline_aa.h"
  #include "agg_renderer_outline_image.h"
  #include "agg_pixfmt_rgb.h"
  #include "ctrl/agg_slider_ctrl.h"
  #include "ctrl/agg_bezier_ctrl.h"
  #include "platform/agg_platform_support.h"
  
  //#define AGG_BGRA32
  #define AGG_BGR24
  //#define AGG_RGBA32
  //#define AGG_BGRA128
  #include "pixel_formats.h"
  
  enum flip_y_e { flip_y = true };
  
  
  static agg::int8u brightness_to_alpha[256 * 3] = 
  {
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 254, 254, 254, 254, 254, 254, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
      254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 253, 253, 
      253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 252, 
      252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 251, 251, 251, 251, 251, 
      251, 251, 251, 251, 250, 250, 250, 250, 250, 250, 250, 250, 249, 249, 249, 249, 
      249, 249, 249, 248, 248, 248, 248, 248, 248, 248, 247, 247, 247, 247, 247, 246, 
      246, 246, 246, 246, 246, 245, 245, 245, 245, 245, 244, 244, 244, 244, 243, 243, 
      243, 243, 243, 242, 242, 242, 242, 241, 241, 241, 241, 240, 240, 240, 239, 239, 
      239, 239, 238, 238, 238, 238, 237, 237, 237, 236, 236, 236, 235, 235, 235, 234, 
      234, 234, 233, 233, 233, 232, 232, 232, 231, 231, 230, 230, 230, 229, 229, 229, 
      228, 228, 227, 227, 227, 226, 226, 225, 225, 224, 224, 224, 223, 223, 222, 222, 
      221, 221, 220, 220, 219, 219, 219, 218, 218, 217, 217, 216, 216, 215, 214, 214, 
      213, 213, 212, 212, 211, 211, 210, 210, 209, 209, 208, 207, 207, 206, 206, 205, 
      204, 204, 203, 203, 202, 201, 201, 200, 200, 199, 198, 198, 197, 196, 196, 195, 
      194, 194, 193, 192, 192, 191, 190, 190, 189, 188, 188, 187, 186, 186, 185, 184, 
      183, 183, 182, 181, 180, 180, 179, 178, 177, 177, 176, 175, 174, 174, 173, 172, 
      171, 171, 170, 169, 168, 167, 166, 166, 165, 164, 163, 162, 162, 161, 160, 159, 
      158, 157, 156, 156, 155, 154, 153, 152, 151, 150, 149, 148, 148, 147, 146, 145, 
      144, 143, 142, 141, 140, 139, 138, 137, 136, 135, 134, 133, 132, 131, 130, 129, 
      128, 128, 127, 125, 124, 123, 122, 121, 120, 119, 118, 117, 116, 115, 114, 113, 
      112, 111, 110, 109, 108, 107, 106, 105, 104, 102, 101, 100,  99,  98,  97,  96,  
       95,  94,  93,  91,  90,  89,  88,  87,  86,  85,  84,  82,  81,  80,  79,  78, 
       77,  75,  74,  73,  72,  71,  70,  69,  67,  66,  65,  64,  63,  61,  60,  59, 
       58,  57,  56,  54,  53,  52,  51,  50,  48,  47,  46,  45,  44,  42,  41,  40, 
       39,  37,  36,  35,  34,  33,  31,  30,  29,  28,  27,  25,  24,  23,  22,  20, 
       19,  18,  17,  15,  14,  13,  12,  11,   9,   8,   7,   6,   4,   3,   2,   1
  };
  
  
  class pattern_src_brightness_to_alpha
  {
  public:
      pattern_src_brightness_to_alpha(agg::rendering_buffer& rb) : 
          m_rb(&rb), m_pf(*m_rb) {}
  
      unsigned width()  const { return m_pf.width();  }
      unsigned height() const { return m_pf.height(); }
      color_type pixel(int x, int y) const
      {
          color_type c = m_pf.pixel(x, y);
          // It's a bit of a hack, but we can treat the 8-bit alpha value as a cover.
          color_type::calc_type sum = c.r + c.g + c.b;
          int i = int(sum * sizeof(brightness_to_alpha) / (3 * color_type::full_value()));
          agg::cover_type cover = brightness_to_alpha[i];
          c.a = color_type::mult_cover(color_type::full_value(), cover);
          return c;
      }
  
  private:
      agg::rendering_buffer* m_rb;
      pixfmt m_pf;
  };
  
  
  class the_application : public agg::platform_support
  {
      agg::srgba8 m_ctrl_color;
      agg::bezier_ctrl<color_type> m_curve1;
      agg::bezier_ctrl<color_type> m_curve2;
      agg::bezier_ctrl<color_type> m_curve3;
      agg::bezier_ctrl<color_type> m_curve4;
      agg::bezier_ctrl<color_type> m_curve5;
      agg::bezier_ctrl<color_type> m_curve6;
      agg::bezier_ctrl<color_type> m_curve7;
      agg::bezier_ctrl<color_type> m_curve8;
      agg::bezier_ctrl<color_type> m_curve9;
      agg::slider_ctrl<color_type> m_scale_x;
      agg::slider_ctrl<color_type> m_start_x;
  
  public:
      typedef agg::renderer_base<pixfmt> renderer_base;
      typedef agg::renderer_scanline_aa_solid<renderer_base> renderer_scanline;
      typedef agg::rasterizer_scanline_aa<> rasterizer_scanline;
      typedef agg::scanline_p8 scanline;
  
  
      the_application(agg::pix_format_e format, bool flip_y) :
          agg::platform_support(format, flip_y),
          m_ctrl_color(agg::rgba(0, 0.3, 0.5, 0.3)),
          m_scale_x(5.0,   5.0, 240.0, 12.0, !flip_y),
          m_start_x(250.0, 5.0, 495.0, 12.0, !flip_y)
      {
          m_curve1.line_color(m_ctrl_color);
          m_curve2.line_color(m_ctrl_color);
          m_curve3.line_color(m_ctrl_color);
          m_curve4.line_color(m_ctrl_color);
          m_curve5.line_color(m_ctrl_color);
          m_curve6.line_color(m_ctrl_color);
          m_curve7.line_color(m_ctrl_color);
          m_curve8.line_color(m_ctrl_color);
          m_curve9.line_color(m_ctrl_color);
  
          m_curve1.curve(64, 19, 14, 126, 118, 266, 19, 265);
          m_curve2.curve(112, 113, 178, 32, 200, 132, 125, 438);
          m_curve3.curve(401, 24, 326, 149, 285, 11, 177, 77);
          m_curve4.curve(188, 427, 129, 295, 19, 283, 25, 410);
          m_curve5.curve(451, 346, 302, 218, 265, 441, 459, 400);
          m_curve6.curve(454, 198, 14, 13, 220, 291, 483, 283);
          m_curve7.curve(301, 398, 355, 231, 209, 211, 170, 353);
          m_curve8.curve(484, 101, 222, 33, 486, 435, 487, 138);
          m_curve9.curve(143, 147, 11, 45, 83, 427, 132, 197);
  
          add_ctrl(m_curve1);
          add_ctrl(m_curve2);
          add_ctrl(m_curve3);
          add_ctrl(m_curve4);
          add_ctrl(m_curve5);
          add_ctrl(m_curve6);
          add_ctrl(m_curve7);
          add_ctrl(m_curve8);
          add_ctrl(m_curve9);
  
          m_curve1.no_transform();
          m_curve2.no_transform();
          m_curve3.no_transform();
          m_curve4.no_transform();
          m_curve5.no_transform();
          m_curve6.no_transform();
          m_curve7.no_transform();
          m_curve8.no_transform();
          m_curve9.no_transform();
  
          m_scale_x.label("Scale X=%.2f");
          m_scale_x.range(0.2, 3.0);
          m_scale_x.value(1.0);
          m_scale_x.no_transform();
          add_ctrl(m_scale_x);
  
          m_start_x.label("Start X=%.2f");
          m_start_x.range(0.0, 10.0);
          m_start_x.value(0.0);
          m_start_x.no_transform();
          add_ctrl(m_start_x);
      }
  
  
      template<class Pattern, 
               class Rasterizer, 
               class Renderer, 
               class PatternSource, 
               class VertexSource>
      void draw_curve(Pattern& patt, 
                      Rasterizer& ras, 
                      Renderer& ren, 
                      PatternSource& src, 
                      VertexSource& vs)
      {
          patt.create(src);
          ren.scale_x(m_scale_x.value());
          ren.start_x(m_start_x.value());
          ras.add_path(vs);
      }
  
  
      virtual void on_draw()
      {
          pixfmt pf(rbuf_window());
          renderer_base ren_base(pf);
          ren_base.clear(agg::rgba(1.0, 1.0, 0.95));
          renderer_scanline ren(ren_base);
  
          rasterizer_scanline ras;
          scanline sl;
  
          // Pattern source. Must have an interface:
          // width() const
          // height() const
          // pixel(int x, int y) const
          // Any agg::renderer_base<> or derived
          // is good for the use as a source.
          //-----------------------------------
          pattern_src_brightness_to_alpha p1(rbuf_img(0));
          pattern_src_brightness_to_alpha p2(rbuf_img(1));
          pattern_src_brightness_to_alpha p3(rbuf_img(2));
          pattern_src_brightness_to_alpha p4(rbuf_img(3));
          pattern_src_brightness_to_alpha p5(rbuf_img(4));
          pattern_src_brightness_to_alpha p6(rbuf_img(5));
          pattern_src_brightness_to_alpha p7(rbuf_img(6));
          pattern_src_brightness_to_alpha p8(rbuf_img(7));
          pattern_src_brightness_to_alpha p9(rbuf_img(8));
  
          agg::pattern_filter_bilinear_rgba<color_type> fltr;           // Filtering functor
  
          // agg::line_image_pattern is the main container for the patterns. It creates
          // a copy of the patterns extended according to the needs of the filter.
          // agg::line_image_pattern can operate with arbitrary image width, but if the 
          // width of the pattern is power of 2, it's better to use the modified
          // version agg::line_image_pattern_pow2 because it works about 15-25 percent
          // faster than agg::line_image_pattern (because of using simple masking instead 
          // of expensive '%' operation). 
          typedef agg::line_image_pattern<agg::pattern_filter_bilinear_rgba<color_type> > pattern_type;
          typedef agg::renderer_base<pixfmt> base_ren_type;
          typedef agg::renderer_outline_image<base_ren_type, pattern_type> renderer_type;
          typedef agg::rasterizer_outline_aa<renderer_type>                rasterizer_type;
  
          //-- Create with specifying the source
          //pattern_type patt(fltr, src);   
  
          //-- Create uninitialized and set the source
          pattern_type patt(fltr);        
          renderer_type ren_img(ren_base, patt);
          rasterizer_type ras_img(ren_img);
  
          draw_curve(patt, ras_img, ren_img, p1, m_curve1.curve());
          draw_curve(patt, ras_img, ren_img, p2, m_curve2.curve());
          draw_curve(patt, ras_img, ren_img, p3, m_curve3.curve());
          draw_curve(patt, ras_img, ren_img, p4, m_curve4.curve());
          draw_curve(patt, ras_img, ren_img, p5, m_curve5.curve());
          draw_curve(patt, ras_img, ren_img, p6, m_curve6.curve());
          draw_curve(patt, ras_img, ren_img, p7, m_curve7.curve());
          draw_curve(patt, ras_img, ren_img, p8, m_curve8.curve());
          draw_curve(patt, ras_img, ren_img, p9, m_curve9.curve());
  
          agg::render_ctrl(ras, sl, ren_base, m_curve1);
          agg::render_ctrl(ras, sl, ren_base, m_curve2);
          agg::render_ctrl(ras, sl, ren_base, m_curve3);
          agg::render_ctrl(ras, sl, ren_base, m_curve4);
          agg::render_ctrl(ras, sl, ren_base, m_curve5);
          agg::render_ctrl(ras, sl, ren_base, m_curve6);
          agg::render_ctrl(ras, sl, ren_base, m_curve7);
          agg::render_ctrl(ras, sl, ren_base, m_curve8);
          agg::render_ctrl(ras, sl, ren_base, m_curve9);
  
          agg::render_ctrl(ras, sl, ren_base, m_scale_x);
          agg::render_ctrl(ras, sl, ren_base, m_start_x);
      }
  
  
      virtual void on_key(int x, int y, unsigned key, unsigned flags)
      {
          if(key == ' ')
          {
              FILE* fd = fopen(full_file_name("coord"), "w");
              fprintf(fd, "%.0f, %.0f, %.0f, %.0f, %.0f, %.0f, %.0f, %.0f", 
                           m_curve1.x1(), m_curve1.y1(), 
                           m_curve1.x2(), m_curve1.y2(), 
                           m_curve1.x3(), m_curve1.y3(), 
                           m_curve1.x4(), m_curve1.y4());
              fclose(fd);
          }
      }
  
      virtual void on_ctrl_change()
      {
      }
  };
  
  
  int agg_main(int argc, char* argv[])
  {
      the_application app(pix_format, flip_y);
      app.caption("AGG Example. Drawing Lines with Image Patterns");
  
      if(!app.load_img(0, "1") ||
         !app.load_img(1, "2") ||
         !app.load_img(2, "3") ||
         !app.load_img(3, "4") ||
         !app.load_img(4, "5") ||
         !app.load_img(5, "6") ||
         !app.load_img(6, "7") ||
         !app.load_img(7, "8") ||
         !app.load_img(8, "9"))
      {
          char buf[256];
          sprintf(buf, "There must be files 1%s...9%s\n"
                       "Download and unzip:\n"
                       "http://www.antigrain.com/line_patterns.bmp.zip\n"
                       "or\n"
                       "http://www.antigrain.com/line_patterns.ppm.tar.gz\n", 
                       app.img_ext(), app.img_ext());
          app.message(buf);
          return 1;
      }
  
      if(app.init(500, 450, agg::window_resize))
      {
          return app.run();
      }
  
      return 1;
  }
  
  
  