background_wnd/painters/gradient_painter.hpp

// gradient_painter.hpp

// Copyright (C) 2004 Steven Weiß (steven11@gmx.de)
//
// Permission to copy, use, sell and distribute this software is granted
// provided this copyright notice appears in all copies.
// Permission to modify the code and to distribute modified code is granted
// provided this copyright notice appears in all copies, and a notice
// that the code was modified is included with the copyright notice.
//
// This software is provided "as is" without express or implied warranty,
// and with no claim as to its suitability for any purpose.


#pragma once
#include <background_wnd/painter_base.hpp>


namespace win32 { namespace gui {

class gradient_painter : public painter_base
{
public:
     typedef std::pair<COLORREF, COLORREF> GradientColors;       // first: start color, second: end color
     typedef const GradientColors& param0;   
     typedef unsigned param1;

     // c'tor
     gradient_painter(const GradientColors& colors, unsigned angle = 0);   

     // virtual functions of painter_base
     gradient_painter* clone() const;
     void draw(HDC hDC, int cx, int cy);     
     bool is_opaque(int cx, int cy) const;
          
     // own functions
     void gradient_colors(const GradientColors& colors);
     GradientColors gradient_colors() const;
     void angle(unsigned angle);
     unsigned angle() const;
     static GradientColors make_gradient_colors(COLORREF crStart, COLORREF crEnd);   

private:
     void draw_linear(HDC hDC, int cx, int cy, int r1, int g1, int b1, int r2, int g2, int b2);

     GradientColors  colors_;
     unsigned       angle_;
};

} }  // namespace win32::gui

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