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0b24f4cdbf
* Added all missing examples, dodgy Jamfile still * Fixed attributions and Jamfile indent * One readme per example: synopsis, build and exec reqs * Cleaned up example/convolve2d.cpp * Added example target to root Jamfile Closes #436
53 lines
1.9 KiB
C++
53 lines
1.9 KiB
C++
//
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// Copyright 2020 Olzhas Zhumabek <anonymous.from.applecity@gmail.com>
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//
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <boost/gil.hpp>
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#include <boost/gil/extension/io/png.hpp>
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#include <limits>
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#include <vector>
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namespace gil = boost::gil;
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// Demonstrates the use of a rasterizer to generate an image of a line
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// The various rasterizers available are defined in include/boost/gil/rasterization/circle.hpp,
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// include/boost/gil/rasterization/ellipse.hpp and include/boost/gil/rasterization/line.hpp
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// The rasterizer used implements the Bresenham's line algorithm.
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// Multiple images are created, all of the same size, but with areas of different sizes passed to the rasterizer, resulting in different lines.
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// See also:
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// rasterizer_circle.cpp - Demonstrates the use of a rasterizer to generate an image of a circle
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// rasterizer_ellipse.cpp - Demonstrates the use of a rasterizer to generate an image of an ellipse
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const std::ptrdiff_t size = 256;
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void line_bresenham(std::ptrdiff_t width, std::ptrdiff_t height, const std::string& output_name)
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{
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const auto rasterizer = gil::bresenham_line_rasterizer{};
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std::vector<gil::point_t> line_points(rasterizer.point_count(width, height));
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gil::gray8_image_t image(size, size);
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auto view = gil::view(image);
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rasterizer({0, 0}, {width - 1, height - 1}, line_points.begin());
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for (const auto& point : line_points)
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{
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view(point) = std::numeric_limits<gil::uint8_t>::max();
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}
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gil::write_view(output_name, view, gil::png_tag{});
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}
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int main()
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{
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line_bresenham(256, 256, "line-bresenham-256-256.png");
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line_bresenham(256, 128, "line-bresenham-256-128.png");
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line_bresenham(256, 1, "line-bresenham-256-1.png");
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line_bresenham(1, 256, "line-bresenham-1-256.png");
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}
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