include/sge/gui/canvas.hpp

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#ifndef SGE_GUI_CANVAS_HPP_INCLUDED
#define SGE_GUI_CANVAS_HPP_INCLUDED

#include "types.hpp"
#include "../export.hpp"
#include "../renderer/texture.hpp"
#include "../font/types.hpp"
#include "../font/fwd.hpp"
#include "../font/font.hpp"

#include <boost/scoped_ptr.hpp>

#include <vector>

namespace sge
{
namespace gui
{
namespace rect_type
{
enum type { outline,filled };
}

// TODO: canvas has to accept three parameters: invalid_rect, widget_rect and the view. 
// widget_rect and invalid_rect have to be absolute rects. the drawing functions get coordinates 
// (relative to the widget's local area) and have to translate those local
// coordinates to coordinates which are relative to the invalid area's origin
class canvas
{
    public:
    typedef renderer::image_view view_type;
    typedef renderer::const_image_view const_view_type;
    typedef renderer::color color_type;
    typedef std::vector<point> point_container;

    SGE_SYMBOL canvas(view_type const &,rect const &widget_rect,rect const &invalid_rect);
    SGE_SYMBOL dim const widget_size();
    rect const widget_area() const { return widget_; }
    rect const invalid_area() const { return invalid_; }
    point const widget_pos() const { return point(widget_area().left(),widget_area().top()); }
    SGE_SYMBOL void draw_rect(rect const &,color_type,rect_type::type);
    SGE_SYMBOL void draw_text(
        string const &,
        point const &,
        dim const &max_size,
        font::align_h::type,
        font::align_v::type,
        font::flag_t = font::flags::default_);
    SGE_SYMBOL void draw_line(point const &,point const &,color_type);
    SGE_SYMBOL void draw_line_strip(point_container const &,color_type,bool loop = true);
    SGE_SYMBOL void reset_font(font::metrics_ptr,color_type fg,color_type bg);
    SGE_SYMBOL void draw_pixel(point const &,color_type);
    view_type view() { return texture_; }
    view_type view() const { return texture_; }
    private:
    view_type const texture_;
    rect const widget_;
    rect const invalid_;
    font::drawer_ptr const drawer;
    font::metrics_ptr metrics;
    font::font_ptr font;

    view_type sub_view(rect const &);
    
    friend class font_drawer_canvas;
    void blit_font(
        point const &,
        font::const_image_view const &,
        color_type fg,
        color_type bg);
};
}
}

#endif

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