diff options
Diffstat (limited to 'example.cc')
| -rw-r--r-- | example.cc | 45 |
1 files changed, 25 insertions, 20 deletions
@@ -3,44 +3,49 @@ #include <cmath> #include <algorithm> -template <int p> -double minkowski_metric(int refX, int refY, int x, int y) { - return std::pow( - std::pow(std::abs(refX - x), p) + std::pow(std::abs(refY - y), p), - 1.0/p - ); +int minkowski_metric(double p, int refX, int refY, int x, int y) { + return static_cast<int>(std::nearbyint( + std::pow( + std::pow(std::abs(refX - x), p) + std::pow(std::abs(refY - y), p), + 1.0 / p + ) + )); } -double euclidean_metric(int refX, int refY, int x, int y) { - return minkowski_metric<2>(refX, refY, x, y); +int euclidean_metric(int refX, int refY, int x, int y) { + return minkowski_metric(2, refX, refY, x, y); } int manhattan_metric(int refX, int refY, int x, int y) { - return minkowski_metric<1>(refX, refY, x, y); + return minkowski_metric(1, refX, refY, x, y); } int main(int, char*[]) { using refpos = std::tuple<int, int, imgen::color>; - std::array<refpos, 5> ref{ - refpos(100, 50, imgen::color(255, 0, 0 )), - refpos(490, 300, imgen::color(0, 255, 0 )), - refpos(250, 250, imgen::color(0, 0, 255)), - refpos(400, 20, imgen::color(100, 10, 100)), - refpos(60, 400, imgen::color(20, 60, 300)) + std::array<refpos, 9> ref{ + refpos( 0, 0, imgen::color(255, 0, 0 )), + refpos( 100, 100, imgen::color(0, 255, 0 )), + refpos(-100, 100, imgen::color(0, 0, 255 )), + refpos( 100, -100, imgen::color(255, 255, 0 )), + refpos(-100, -100, imgen::color(0, 255, 255 )), + refpos( 200, 200, imgen::color(255, 0, 0 )), + refpos(-200, 200, imgen::color(0, 255, 0 )), + refpos( 200, -200, imgen::color(0, 255, 255 )), + refpos(-200, -200, imgen::color(255, 255, 0 )) }; imgen::write_ppm( "test.ppm", - 500, - 500, - [&ref](std::size_t x, std::size_t y) -> imgen::color { + 512, + 512, + [&ref](std::ptrdiff_t x, std::ptrdiff_t y) -> imgen::color { const refpos& nearest = *std::min_element( ref.begin(), ref.end(), [x, y](const refpos& a, const refpos& b) -> bool { - return minkowski_metric<5>(std::get<0>(a), std::get<1>(a), x, y) - < minkowski_metric<5>(std::get<0>(b), std::get<1>(b), x, y); + return euclidean_metric(std::get<0>(a), std::get<1>(a), x, y) + < euclidean_metric(std::get<0>(b), std::get<1>(b), x, y); } ); |