agg/inc/agg_renderer_primitives.h

   1 //----------------------------------------------------------------------------
   2 // Anti-Grain Geometry - Version 2.3
   3 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
   4 //
   5 // Permission to copy, use, modify, sell and distribute this software
   6 // is granted provided this copyright notice appears in all copies.
   7 // This software is provided "as is" without express or implied
   8 // warranty, and with no claim as to its suitability for any purpose.
   9 //
  10 //----------------------------------------------------------------------------
  11 // Contact: mcseem@antigrain.com
  12 //          mcseemagg@yahoo.com
  13 //          http://www.antigrain.com
  14 //----------------------------------------------------------------------------
  15 //
  16 // class renderer_primitives
  17 //
  18 //----------------------------------------------------------------------------
  19
  20 #ifndef AGG_RENDERER_PRIMITIVES_INCLUDED
  21 #define AGG_RENDERER_PRIMITIVES_INCLUDED
  22
  23 #include "agg_basics.h"
  24 #include "agg_renderer_base.h"
  25 #include "agg_dda_line.h"
  26 #include "agg_ellipse_bresenham.h"
  27
  28 namespace agg
  29 {
  30     //-----------------------------------------------------renderer_primitives
  31     template<class BaseRenderer> class renderer_primitives
  32     {
  33     public:
  34         typedef BaseRenderer base_ren_type;
  35         typedef typename base_ren_type::color_type color_type;
  36
  37         //--------------------------------------------------------------------
  38         renderer_primitives(base_ren_type& ren) :
  39             m_ren(&ren),
  40             m_fill_color(),
  41             m_line_color(),
  42             m_curr_x(0),
  43             m_curr_y(0)
  44         {
  45         }
  46
  47         //--------------------------------------------------------------------
  48         static int coord(double c)
  49         {
  50             return int(c * line_bresenham_interpolator::subpixel_size);
  51         }
  52
  53         //--------------------------------------------------------------------
  54         void fill_color(const color_type& c) { m_fill_color = c; }
  55         void line_color(const color_type& c) { m_line_color = c; }
  56         const color_type& fill_color() const { return m_fill_color; }
  57         const color_type& line_color() const { return m_line_color; }
  58
  59         //--------------------------------------------------------------------
  60         void rectangle(int x1, int y1, int x2, int y2)
  61         {
  62             m_ren->blend_hline(x1,   y1,   x2-1, m_line_color, cover_full);
  63             m_ren->blend_vline(x2,   y1,   y2-1, m_line_color, cover_full);
  64             m_ren->blend_hline(x1+1, y2,   x2,   m_line_color, cover_full);
  65             m_ren->blend_vline(x1,   y1+1, y2,   m_line_color, cover_full);
  66         }
  67
  68         //--------------------------------------------------------------------
  69         void solid_rectangle(int x1, int y1, int x2, int y2)
  70         {
  71             m_ren->blend_bar(x1, y1, x2, y2, m_fill_color, cover_full);
  72         }
  73
  74         //--------------------------------------------------------------------
  75         void outlined_rectangle(int x1, int y1, int x2, int y2)
  76         {
  77             rectangle(x1, y1, x2, y2);
  78             m_ren->blend_bar(x1+1, y1+1, x2-1, y2-1, m_fill_color, cover_full);
  79         }
  80
  81         //--------------------------------------------------------------------
  82         void ellipse(int x, int y, int rx, int ry)
  83         {
  84             ellipse_bresenham_interpolator ei(rx, ry);
  85             int dx = 0;
  86             int dy = -ry;
  87             do
  88             {
  89                 dx += ei.dx();
  90                 dy += ei.dy();
  91                 m_ren->blend_pixel(x + dx, y + dy, m_line_color, cover_full);
  92                 m_ren->blend_pixel(x + dx, y - dy, m_line_color, cover_full);
  93                 m_ren->blend_pixel(x - dx, y - dy, m_line_color, cover_full);
  94                 m_ren->blend_pixel(x - dx, y + dy, m_line_color, cover_full);
  95                 ++ei;
  96             }
  97             while(dy < 0);
  98         }
  99
 100         //--------------------------------------------------------------------
 101         void solid_ellipse(int x, int y, int rx, int ry)
 102         {
 103             ellipse_bresenham_interpolator ei(rx, ry);
 104             int dx = 0;
 105             int dy = -ry;
 106             int dy0 = dy;
 107             int dx0 = dx;
 108
 109             do
 110             {
 111                 dx += ei.dx();
 112                 dy += ei.dy();
 113
 114                 if(dy != dy0)
 115                 {
 116                     m_ren->blend_hline(x-dx0, y+dy0, x+dx0, m_fill_color, cover_full);
 117                     m_ren->blend_hline(x-dx0, y-dy0, x+dx0, m_fill_color, cover_full);
 118                 }
 119                 dx0 = dx;
 120                 dy0 = dy;
 121                 ++ei;
 122             }
 123             while(dy < 0);
 124             m_ren->blend_hline(x-dx0, y+dy0, x+dx0, m_fill_color, cover_full);
 125         }
 126
 127         //--------------------------------------------------------------------
 128         void outlined_ellipse(int x, int y, int rx, int ry)
 129         {
 130             ellipse_bresenham_interpolator ei(rx, ry);
 131             int dx = 0;
 132             int dy = -ry;
 133
 134             do
 135             {
 136                 dx += ei.dx();
 137                 dy += ei.dy();
 138
 139                 m_ren->blend_pixel(x + dx, y + dy, m_line_color, cover_full);
 140                 m_ren->blend_pixel(x + dx, y - dy, m_line_color, cover_full);
 141                 m_ren->blend_pixel(x - dx, y - dy, m_line_color, cover_full);
 142                 m_ren->blend_pixel(x - dx, y + dy, m_line_color, cover_full);
 143
 144                 if(ei.dy() && dx)
 145                 {
 146                    m_ren->blend_hline(x-dx+1, y+dy, x+dx-1, m_fill_color, cover_full);
 147                    m_ren->blend_hline(x-dx+1, y-dy, x+dx-1, m_fill_color, cover_full);
 148                 }
 149                 ++ei;
 150             }
 151             while(dy < 0);
 152         }
 153
 154         //--------------------------------------------------------------------
 155         void line(int x1, int y1, int x2, int y2, bool last=false)
 156         {
 157             line_bresenham_interpolator li(x1, y1, x2, y2);
 158
 159             unsigned len = li.len();
 160             if(len == 0)
 161             {
 162                 if(last)
 163                 {
 164                     m_ren->blend_pixel(li.line_lr(x1), li.line_lr(y1), m_line_color, cover_full);
 165                 }
 166                 return;
 167             }
 168
 169             if(last) ++len;
 170
 171             if(li.is_ver())
 172             {
 173                 do
 174                 {
 175                     m_ren->blend_pixel(li.x2(), li.y1(), m_line_color, cover_full);
 176                     li.vstep();
 177                 }
 178                 while(--len);
 179             }
 180             else
 181             {
 182                 do
 183                 {
 184                     m_ren->blend_pixel(li.x1(), li.y2(), m_line_color, cover_full);
 185                     li.hstep();
 186                 }
 187                 while(--len);
 188             }
 189         }
 190
 191         //--------------------------------------------------------------------
 192         void move_to(int x, int y)
 193         {
 194             m_curr_x = x;
 195             m_curr_y = y;
 196         }
 197
 198         //--------------------------------------------------------------------
 199         void line_to(int x, int y, bool last=false)
 200         {
 201             line(m_curr_x, m_curr_y, x, y, last);
 202             m_curr_x = x;
 203             m_curr_y = y;
 204         }
 205
 206         //--------------------------------------------------------------------
 207         const base_ren_type& ren() const { return *m_ren; }
 208         base_ren_type& ren() { return *m_ren; }
 209
 210         //--------------------------------------------------------------------
 211         const rendering_buffer& rbuf() const { return m_ren->rbuf(); }
 212         rendering_buffer& rbuf() { return m_ren->rbuf(); }
 213
 214     private:
 215         base_ren_type* m_ren;
 216         color_type m_fill_color;
 217         color_type m_line_color;
 218         int m_curr_x;
 219         int m_curr_y;
 220     };
 221
 222 }
 223
 224 #endif