2 * Copyright 2013 Sveriges Television AB http://casparcg.com/
4 * This file is part of CasparCG (www.casparcg.com).
6 * CasparCG is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * CasparCG is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
19 * Author: Helge Norberg, helge.norberg@svt.se.com
22 #include "image_algorithms.h"
27 namespace caspar { namespace image {
29 std::vector<std::pair<int, int>> get_line_points(int num_pixels, double angle_radians)
31 std::vector<std::pair<int, int>> line_points;
32 line_points.reserve(num_pixels);
34 double delta_x = std::cos(angle_radians);
35 double delta_y = -std::sin(angle_radians); // In memory is revered
36 double max_delta = std::max(std::abs(delta_x), std::abs(delta_y));
37 double amplification = 1.0 / max_delta;
38 delta_x *= amplification;
39 delta_y *= amplification;
41 for (int i = 1; i <= num_pixels; ++i)
42 line_points.push_back(std::make_pair(
43 static_cast<int>(std::floor(delta_x * static_cast<double>(i) + 0.5)),
44 static_cast<int>(std::floor(delta_y * static_cast<double>(i) + 0.5))));
46 return std::move(line_points);
49 }} //namespace caspar::image