agg_basics.h

windows ce 下的画各种b样条曲线

        T x1, y1, x2, y2;

        rect_base() {}
        rect_base(T x1_, T y1_, T x2_, T y2_) :
            x1(x1_), y1(y1_), x2(x2_), y2(y2_) {}

        void init(T x1_, T y1_, T x2_, T y2_) 
        {
            x1 = x1_; y1 = y1_; x2 = x2_; y2 = y2_; 
        }

        const self_type& normalize()
        {
            T t;
            if(x1 > x2) { t = x1; x1 = x2; x2 = t; }
            if(y1 > y2) { t = y1; y1 = y2; y2 = t; }
            return *this;
        }

        bool clip(const self_type& r)
        {
            if(x2 > r.x2) x2 = r.x2;
            if(y2 > r.y2) y2 = r.y2;
            if(x1 < r.x1) x1 = r.x1;
            if(y1 < r.y1) y1 = r.y1;
            return x1 <= x2 && y1 <= y2;
        }

        bool is_valid() const
        {
            return x1 <= x2 && y1 <= y2;
        }

        bool hit_test(T x, T y) const
        {
            return (x >= x1 && x <= x2 && y >= y1 && y <= y2);
        }
    };

    //-----------------------------------------------------intersect_rectangles
    template<class Rect> 
    inline Rect intersect_rectangles(const Rect& r1, const Rect& r2)
    {
        Rect r = r1;

        // First process x2,y2 because the other order 
        // results in Internal Compiler Error under 
        // Microsoft Visual C++ .NET 2003 69462-335-0000007-18038 in 
        // case of "Maximize Speed" optimization option.
        //-----------------
        if(r.x2 > r2.x2) r.x2 = r2.x2; 
        if(r.y2 > r2.y2) r.y2 = r2.y2;
        if(r.x1 < r2.x1) r.x1 = r2.x1;
        if(r.y1 < r2.y1) r.y1 = r2.y1;
        return r;
    }


    //---------------------------------------------------------unite_rectangles
    template<class Rect> 
    inline Rect unite_rectangles(const Rect& r1, const Rect& r2)
    {
        Rect r = r1;
        if(r.x2 < r2.x2) r.x2 = r2.x2;
        if(r.y2 < r2.y2) r.y2 = r2.y2;
        if(r.x1 > r2.x1) r.x1 = r2.x1;
        if(r.y1 > r2.y1) r.y1 = r2.y1;
        return r;
    }

    typedef rect_base<int>    rect_i; //----rect_i
    typedef rect_base<float>  rect_f; //----rect_f
    typedef rect_base<double> rect_d; //----rect_d

    //---------------------------------------------------------path_commands_e
    enum path_commands_e
    {
        path_cmd_stop     = 0,        //----path_cmd_stop    
        path_cmd_move_to  = 1,        //----path_cmd_move_to 
        path_cmd_line_to  = 2,        //----path_cmd_line_to 
        path_cmd_curve3   = 3,        //----path_cmd_curve3  
        path_cmd_curve4   = 4,        //----path_cmd_curve4  
        path_cmd_curveN   = 5,        //----path_cmd_curveN
        path_cmd_catrom   = 6,        //----path_cmd_catrom
        path_cmd_ubspline = 7,        //----path_cmd_ubspline
        path_cmd_end_poly = 0x0F,     //----path_cmd_end_poly
        path_cmd_mask     = 0x0F      //----path_cmd_mask    
    };

    //------------------------------------------------------------path_flags_e
    enum path_flags_e
    {
        path_flags_none  = 0,         //----path_flags_none 
        path_flags_ccw   = 0x10,      //----path_flags_ccw  
        path_flags_cw    = 0x20,      //----path_flags_cw   
        path_flags_close = 0x40,      //----path_flags_close
        path_flags_mask  = 0xF0       //----path_flags_mask 
    };

    //---------------------------------------------------------------is_vertex
    inline bool is_vertex(unsigned c)
    {
        return c >= path_cmd_move_to && c < path_cmd_end_poly;
    }

    //--------------------------------------------------------------is_drawing
    inline bool is_drawing(unsigned c)
    {
        return c >= path_cmd_line_to && c < path_cmd_end_poly;
    }

    //-----------------------------------------------------------------is_stop
    inline bool is_stop(unsigned c)
    { 
        return c == path_cmd_stop;
    }

    //--------------------------------------------------------------is_move_to
    inline bool is_move_to(unsigned c)
    {
        return c == path_cmd_move_to;
    }

    //--------------------------------------------------------------is_line_to
    inline bool is_line_to(unsigned c)
    {
        return c == path_cmd_line_to;
    }

    //----------------------------------------------------------------is_curve
    inline bool is_curve(unsigned c)
    {
        return c == path_cmd_curve3 || c == path_cmd_curve4;
    }

    //---------------------------------------------------------------is_curve3
    inline bool is_curve3(unsigned c)
    {
        return c == path_cmd_curve3;
    }

    //---------------------------------------------------------------is_curve4
    inline bool is_curve4(unsigned c)
    {
        return c == path_cmd_curve4;
    }

    //-------------------------------------------------------------is_end_poly
    inline bool is_end_poly(unsigned c)
    {
        return (c & path_cmd_mask) == path_cmd_end_poly;
    }

    //----------------------------------------------------------------is_close
    inline bool is_close(unsigned c)
    {
        return (c & ~(path_flags_cw | path_flags_ccw)) ==
               (path_cmd_end_poly | path_flags_close); 
    }

    //------------------------------------------------------------is_next_poly
    inline bool is_next_poly(unsigned c)
    {
        return is_stop(c) || is_move_to(c) || is_end_poly(c);
    }

    //-------------------------------------------------------------------is_cw
    inline bool is_cw(unsigned c)
    {
        return (c & path_flags_cw) != 0;
    }

    //------------------------------------------------------------------is_ccw
    inline bool is_ccw(unsigned c)
    {
        return (c & path_flags_ccw) != 0;
    }

    //-------------------------------------------------------------is_oriented
    inline bool is_oriented(unsigned c)
    {
        return (c & (path_flags_cw | path_flags_ccw)) != 0; 
    }

    //---------------------------------------------------------------is_closed
    inline bool is_closed(unsigned c)
    {
        return (c & path_flags_close) != 0; 
    }

    //----------------------------------------------------------get_close_flag
    inline unsigned get_close_flag(unsigned c)
    {
        return c & path_flags_close; 
    }

    //-------------------------------------------------------clear_orientation
    inline unsigned clear_orientation(unsigned c)
    {
        return c & ~(path_flags_cw | path_flags_ccw);
    }

    //---------------------------------------------------------get_orientation
    inline unsigned get_orientation(unsigned c)
    {
        return c & (path_flags_cw | path_flags_ccw);
    }

    //---------------------------------------------------------set_orientation
    inline unsigned set_orientation(unsigned c, unsigned o)
    {
        return clear_orientation(c) | o;
    }

    //--------------------------------------------------------------point_base
    template<class T> struct point_base
    {
        typedef T value_type;
        T x,y;
        point_base() {}
        point_base(T x_, T y_) : x(x_), y(y_) {}
    };
    typedef point_base<int>    point_i; //-----point_i
    typedef point_base<float>  point_f; //-----point_f
    typedef point_base<double> point_d; //-----point_d

    //-------------------------------------------------------------vertex_base
    template<class T> struct vertex_base
    {
        typedef T value_type;
        T x,y;
        unsigned cmd;
        vertex_base() {}
        vertex_base(T x_, T y_, unsigned cmd_) : x(x_), y(y_), cmd(cmd_) {}
    };
    typedef vertex_base<int>    vertex_i; //-----vertex_i
    typedef vertex_base<float>  vertex_f; //-----vertex_f
    typedef vertex_base<double> vertex_d; //-----vertex_d

    //----------------------------------------------------------------row_info
    template<class T> struct row_info
    {
        int x1, x2;
        T* ptr;
        row_info() {}
        row_info(int x1_, int x2_, T* ptr_) : x1(x1_), x2(x2_), ptr(ptr_) {}
    };

    //----------------------------------------------------------const_row_info
    template<class T> struct const_row_info
    {
        int x1, x2;
        const T* ptr;
        const_row_info() {}
        const_row_info(int x1_, int x2_, const T* ptr_) : 
            x1(x1_), x2(x2_), ptr(ptr_) {}
    };

    //------------------------------------------------------------is_equal_eps
    template<class T> inline bool is_equal_eps(T v1, T v2, T epsilon)
    {
        return fabs(v1 - v2) <= double(epsilon);
    }

}


#endif