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- //
- // Copyright 2005-2007 Adobe Systems Incorporated
- //
- // Distributed under the Boost Software License, Version 1.0
- // See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt
- //
- #include <boost/gil/image.hpp>
- #include <boost/gil/typedefs.hpp>
- #include <boost/gil/extension/io/jpeg.hpp>
- // Example for convolve_rows() and convolve_cols() in the numeric extension
- using namespace boost::gil;
- // Models a Unary Function
- template <typename P> // Models PixelValueConcept
- struct mandelbrot_fn
- {
- using point_t = boost::gil::point_t;
- using const_t = mandelbrot_fn;
- using value_type = P;
- using reference = value_type;
- using const_reference = value_type;
- using argument_type = point_t;
- using result_type = reference;
- static constexpr bool is_mutable =false;
- value_type _in_color,_out_color;
- point_t _img_size;
- static const int MAX_ITER=100; // max number of iterations
- mandelbrot_fn() {}
- mandelbrot_fn(const point_t& sz, const value_type& in_color, const value_type& out_color) : _in_color(in_color), _out_color(out_color), _img_size(sz) {}
- result_type operator()(const point_t& p) const {
- // normalize the coords to (-2..1, -1.5..1.5)
- // (actually make y -1.0..2 so it is asymmetric, so we can verify some view factory methods)
- double t=get_num_iter(point<double>(p.x/(double)_img_size.x*3-2, p.y/(double)_img_size.y*3-1.0f));//1.5f));
- t=pow(t,0.2);
- value_type ret;
- for (int k=0; k<num_channels<P>::value; ++k)
- ret[k]=(typename channel_type<P>::type)(_in_color[k]*t + _out_color[k]*(1-t));
- return ret;
- }
- private:
- double get_num_iter(const point<double>& p) const {
- point<double> Z(0,0);
- for (int i=0; i<MAX_ITER; ++i) {
- Z = point<double>(Z.x*Z.x - Z.y*Z.y + p.x, 2*Z.x*Z.y + p.y);
- if (Z.x*Z.x + Z.y*Z.y > 4)
- return i/(double)MAX_ITER;
- }
- return 0;
- }
- };
- int main()
- {
- using deref_t = mandelbrot_fn<rgb8_pixel_t>;
- using point_t = deref_t::point_t;
- using locator_t = virtual_2d_locator<deref_t,false>;
- using my_virt_view_t = image_view<locator_t>;
- boost::function_requires<PixelLocatorConcept<locator_t>>();
- gil_function_requires<StepIteratorConcept<locator_t::x_iterator>>();
- point_t dims(200,200);
- my_virt_view_t mandel(dims, locator_t(point_t(0,0), point_t(1,1), deref_t(dims, rgb8_pixel_t(255,0,255), rgb8_pixel_t(0,255,0))));
- write_view("out-mandelbrot.jpg",mandel, jpeg_tag{});
- return 0;
- }
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