agg_renderer_markers.h

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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software 
// is granted provided this copyright notice appears in all copies. 
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: [e-mail]
//          [e-mail]
//          http://www.antigrain.com
//----------------------------------------------------------------------------
//
// class renderer_markers
//
//----------------------------------------------------------------------------

#ifndef AGG_RENDERER_MARKERS_INCLUDED
#define AGG_RENDERER_MARKERS_INCLUDED

#include "agg_basics.h"
#include "agg_renderer_primitives.h"

namespace agg
{

    //---------------------------------------------------------------marker_e
    enum marker_e
    {
        marker_square,
        marker_diamond,
        marker_circle,
        marker_crossed_circle,
        marker_semiellipse_left,
        marker_semiellipse_right,
        marker_semiellipse_up,
        marker_semiellipse_down,
        marker_triangle_left,
        marker_triangle_right,
        marker_triangle_up,
        marker_triangle_down,
        marker_four_rays,
        marker_cross,
        marker_x,
        marker_dash,
        marker_dot,
        marker_pixel,
        
        end_of_markers
    };



    //--------------------------------------------------------renderer_markers
    template<class BaseRenderer> class renderer_markers :
    public renderer_primitives<BaseRenderer>
    {
    public:
        typedef renderer_primitives<BaseRenderer> base_type;
        typedef BaseRenderer base_ren_type;
        typedef typename base_ren_type::color_type color_type;

        //--------------------------------------------------------------------
        renderer_markers(base_ren_type& rbuf) :
            base_type(rbuf)
        {}

        //--------------------------------------------------------------------
        bool visible(int x, int y, int r) const
        {
            rect_i rc(x-r, y-r, x+y, y+r);
            return rc.clip(base_type::ren().bounding_clip_box());  
        }

        //--------------------------------------------------------------------
        void square(int x, int y, int r)
        {
            if(visible(x, y, r)) 
            {  
                if(r) base_type::outlined_rectangle(x-r, y-r, x+r, y+r);
                else  base_type::ren().blend_pixel(x, y, base_type::fill_color(), cover_full);
            }
        }

        //--------------------------------------------------------------------
        void diamond(int x, int y, int r)
        {
            if(visible(x, y, r))
            {
                if(r)
                {
                    int dy = -r;
                    int dx = 0;
                    do
                    {
                        base_type::ren().blend_pixel(x - dx, y + dy, base_type::line_color(), cover_full);
                        base_type::ren().blend_pixel(x + dx, y + dy, base_type::line_color(), cover_full);
                        base_type::ren().blend_pixel(x - dx, y - dy, base_type::line_color(), cover_full);
                        base_type::ren().blend_pixel(x + dx, y - dy, base_type::line_color(), cover_full);
                        
                        if(dx)
                        {
                            base_type::ren().blend_hline(x-dx+1, y+dy, x+dx-1, base_type::fill_color(), cover_full);
                            base_type::ren().blend_hline(x-dx+1, y-dy, x+dx-1, base_type::fill_color(), cover_full);
                        }
                        ++dy;
                        ++dx;
                    }
                    while(dy <= 0);
                }
                else
                {
                    base_type::ren().blend_pixel(x, y, base_type::fill_color(), cover_full);
                }
            }
        }

        //--------------------------------------------------------------------
        void circle(int x, int y, int r)
        {
            if(visible(x, y, r))
            {
                if(r) base_type::outlined_ellipse(x, y, r, r);
                else  base_type::ren().blend_pixel(x, y, base_type::fill_color(), cover_full);
            }
        }



        //--------------------------------------------------------------------
        void crossed_circle(int x, int y, int r)
        {
            if(visible(x, y, r))
            {
                if(r)
                {
                    base_type::outlined_ellipse(x, y, r, r);
                    int r6 = r + (r >> 1);
                    if(r <= 2) r6++;
                    r >>= 1;
                    base_type::ren().blend_hline(x-r6, y, x-r,  base_type::line_color(), cover_full);
                    base_type::ren().blend_hline(x+r,  y, x+r6, base_type::line_color(), cover_full);
                    base_type::ren().blend_vline(x, y-r6, y-r,  base_type::line_color(), cover_full);
                    base_type::ren().blend_vline(x, y+r,  y+r6, base_type::line_color(), cover_full);
                }
                else
                {
                    base_type::ren().blend_pixel(x, y, base_type::fill_color(), cover_full);
                }
            }
        }


        //------------------------------------------------------------------------
        void semiellipse_left(int x, int y, int r)
        {
            if(visible(x, y, r))
            {
                if(r)
                {
                    int r8 = r * 4 / 5;
                    int dy = -r;
                    int dx = 0;
                    ellipse_bresenham_interpolator ei(r * 3 / 5, r+r8);
                    do
                    {
                        dx += ei.dx();
                        dy += ei.dy();
                        
                        base_type::ren().blend_pixel(x + dy, y + dx, base_type::line_color(), cover_full);
                        base_type::ren().blend_pixel(x + dy, y - dx, base_type::line_color(), cover_full);
                        
                        if(ei.dy() && dx)
                        {
                            base_type::ren().blend_vline(x+dy, y-dx+1, y+dx-1, base_type::fill_color(), cover_full);
                        }
                        ++ei;
                    }
                    while(dy < r8);
                    base_type::ren().blend_vline(x+dy, y-dx, y+dx, base_type::line_color(), cover_full);
                }
                else
                {
                    base_type::ren().blend_pixel(x, y, base_type::fill_color(), cover_full);
                }
            }
        }


        //--------------------------------------------------------------------
        void semiellipse_right(int x, int y, int r)
        {
            if(visible(x, y, r))
            {
                if(r)
                {
                    int r8 = r * 4 / 5;
                    int dy = -r;
                    int dx = 0;
                    ellipse_bresenham_interpolator ei(r * 3 / 5, r+r8);
                    do
                    {
                        dx += ei.dx();
                        dy += ei.dy();
                        
                        base_type::ren().blend_pixel(x - dy, y + dx, base_type::line_color(), cover_full);
                        base_type::ren().blend_pixel(x - dy, y - dx, base_type::line_color(), cover_full);
                        
                        if(ei.dy() && dx)
                        {
                            base_type::ren().blend_vline(x-dy, y-dx+1, y+dx-1, base_type::fill_color(), cover_full);
                        }
                        ++ei;
                    }
                    while(dy < r8);
                    base_type::ren().blend_vline(x-dy, y-dx, y+dx, base_type::line_color(), cover_full);
                }
                else
                {
                    base_type::ren().blend_pixel(x, y, base_type::fill_color(), cover_full);
                }
            }
        }


        //--------------------------------------------------------------------
        void semiellipse_up(int x, int y, int r)
        {
            if(visible(x, y, r))
            {
                if(r)
                {
                    int r8 = r * 4 / 5;
                    int dy = -r;