mapnik/include/polygon_symbolizer.hpp

/* This file is part of Mapnik (c++ mapping toolkit)
 * Copyright (C) 2005 Artem Pavlenko
 *
 * Mapnik is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

//$Id: polygon_symbolizer.hpp 39 2005-04-10 20:39:53Z pavlenko $

#ifndef POLYGON_SYMBOLIZER_HPP
#define POLYGON_SYMBOLIZER_HPP

#include "symbolizer.hpp"
#include "image_reader.hpp"
#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_scanline_p.h"
#include "agg_scanline_u.h"
#include "agg_renderer_scanline.h"
#include "agg_pixfmt_rgba.h"
#include "agg_path_storage.h"
#include "agg_span_allocator.h"
#include "agg_span_pattern_rgba.h"
#include "agg_image_accessors.h"

namespace mapnik 
{
    struct polygon_symbolizer : public symbolizer
    {
    private:
	Color fill_;
    public:
	polygon_symbolizer(const Color& fill)
	    : symbolizer(),
	      fill_(fill) {}
	
	virtual ~polygon_symbolizer() {}

	void render(geometry_type& geom,Image32& image) const 
	{
	    typedef agg::renderer_base<agg::pixfmt_rgba32> ren_base;    
	    typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
	    agg::row_ptr_cache<agg::int8u> buf(image.raw_data(),image.width(),image.height(),
					       image.width()*4);
	    agg::pixfmt_rgba32 pixf(buf);
	    ren_base renb(pixf);	    
	    
	    unsigned r=fill_.red();
	    unsigned g=fill_.green();
	    unsigned b=fill_.blue();
	    unsigned a=fill_.alpha();
	    renderer ren(renb);
	    
	    agg::rasterizer_scanline_aa<> ras;
	    agg::scanline_u8 sl;
	    ras.clip_box(0,0,image.width(),image.height());
	    ras.add_path(geom);
	    ren.color(agg::rgba8(r, g, b, a));
	    agg::render_scanlines(ras, sl, ren);
	}
	
    private:
	polygon_symbolizer(const polygon_symbolizer&);
	polygon_symbolizer& operator=(const polygon_symbolizer&);	
    };
    
    struct pattern_symbolizer : public symbolizer
    {
    private:
	ImageData32 pattern_;
    public:
	pattern_symbolizer(std::string const& file,
			 std::string const& type,
			 unsigned width,unsigned height) 
	    : symbolizer(),
	      pattern_(width,height)
	{
	    try 
	    {
		std::auto_ptr<ImageReader> reader(get_image_reader(type,file));
		reader->read(0,0,pattern_);		
	    } 
	    catch (...) 
	    {
		std::cerr<<"exception caught..."<<std::endl;
	    }
	}

	virtual ~pattern_symbolizer() {}

	void render(geometry_type& geom,Image32& image) const
	{
	    typedef agg::renderer_base<agg::pixfmt_rgba32> ren_base; 
	    agg::row_ptr_cache<agg::int8u> buf(image.raw_data(),image.width(),image.height(),
					       image.width()*4);
	    agg::pixfmt_rgba32 pixf(buf);
	    ren_base renb(pixf);
 
	    unsigned w=pattern_.width();
	    unsigned h=pattern_.height();
	    agg::row_ptr_cache<agg::int8u> pattern_rbuf((agg::int8u*)pattern_.getBytes(),w,h,w*4);  

	    typedef agg::wrap_mode_repeat wrap_x_type;
	    typedef agg::wrap_mode_repeat wrap_y_type;
	    typedef agg::image_accessor_wrap<agg::pixfmt_rgba32, 
		wrap_x_type,
		wrap_y_type> img_source_type;

	    typedef agg::span_pattern_rgba<img_source_type> span_gen_type;
	    
	    typedef agg::renderer_scanline_aa<ren_base, 
		agg::span_allocator<agg::rgba8>,
		span_gen_type> renderer_type;  
	    
	    double x0,y0;
	    geom.vertex(&x0,&y0);
	    geom.rewind(0);

	    unsigned offset_x = unsigned(image.width() - x0);
	    unsigned offset_y = unsigned(image.height() - y0);
	    
	    agg::span_allocator<agg::rgba8> sa;
	    img_source_type img_src(pattern_rbuf);
	    span_gen_type sg(img_src, offset_x, offset_y);
	    renderer_type rp(renb,sa, sg);

	    agg::rasterizer_scanline_aa<> ras;
	    agg::scanline_u8 sl;
	    ras.clip_box(0,0,image.width(),image.height());
	    ras.add_path(geom);
	    agg::render_scanlines(ras, sl, rp);   
	}
	
    private:
	pattern_symbolizer(const pattern_symbolizer&);
	pattern_symbolizer& operator=(const pattern_symbolizer&);	
    };
    
}

#endif // POLYGON_SYMBOLIZER_HPP