Copy of wagyu-0.2.0 (b3fa127)

2026-10-05 18:05:42 +02:00 · 2016-12-07 14:14:56 -08:00
parent c0d5171f1d
commit 22cb5186d7
23 changed files with 6503 additions and 0 deletions
@@ -0,0 +1,83 @@
+#pragma once
+
+#include <cmath>
+
+#include <mapbox/geometry/point.hpp>
+#include <mapbox/geometry/polygon.hpp>
+#include <mapbox/geometry/wagyu/point.hpp>
+
+namespace mapbox {
+namespace geometry {
+namespace wagyu {
+
+template <typename T>
+double area(mapbox::geometry::linear_ring<T> const& poly) {
+    std::size_t size = poly.size();
+    if (size < 3) {
+        return 0.0;
+    }
+
+    double a = 0.0;
+    auto itr = poly.begin();
+    auto itr_prev = poly.end();
+    --itr_prev;
+    a += static_cast<double>(itr_prev->x + itr->x) * static_cast<double>(itr_prev->y - itr->y);
+    ++itr;
+    itr_prev = poly.begin();
+    for (; itr != poly.end(); ++itr, ++itr_prev) {
+        a += static_cast<double>(itr_prev->x + itr->x) * static_cast<double>(itr_prev->y - itr->y);
+    }
+    return -a * 0.5;
+}
+
+inline bool value_is_zero(double val) {
+    return std::fabs(val) < std::numeric_limits<double>::epsilon();
+}
+
+inline bool values_are_equal(double x, double y) {
+    return value_is_zero(x - y);
+}
+
+inline bool values_near_equal(double x, double y) {
+    return std::fabs(x - y) < (5.0 * std::numeric_limits<double>::epsilon());
+}
+
+inline bool greater_than_or_equal(double x, double y) {
+    return x > y || values_are_equal(x, y);
+}
+
+inline bool less_than_or_equal(double x, double y) {
+    return x < y || values_are_equal(x, y);
+}
+
+template <typename T>
+bool slopes_equal(mapbox::geometry::point<T> const& pt1,
+                  mapbox::geometry::point<T> const& pt2,
+                  mapbox::geometry::point<T> const& pt3) {
+    return (pt1.y - pt2.y) * (pt2.x - pt3.x) == (pt1.x - pt2.x) * (pt2.y - pt3.y);
+}
+
+template <typename T>
+bool slopes_equal(mapbox::geometry::wagyu::point<T> const& pt1,
+                  mapbox::geometry::wagyu::point<T> const& pt2,
+                  mapbox::geometry::point<T> const& pt3) {
+    return (pt1.y - pt2.y) * (pt2.x - pt3.x) == (pt1.x - pt2.x) * (pt2.y - pt3.y);
+}
+
+template <typename T>
+bool slopes_equal(mapbox::geometry::wagyu::point<T> const& pt1,
+                  mapbox::geometry::wagyu::point<T> const& pt2,
+                  mapbox::geometry::wagyu::point<T> const& pt3) {
+    return (pt1.y - pt2.y) * (pt2.x - pt3.x) == (pt1.x - pt2.x) * (pt2.y - pt3.y);
+}
+
+template <typename T>
+bool slopes_equal(mapbox::geometry::point<T> const& pt1,
+                  mapbox::geometry::point<T> const& pt2,
+                  mapbox::geometry::point<T> const& pt3,
+                  mapbox::geometry::point<T> const& pt4) {
+    return (pt1.y - pt2.y) * (pt3.x - pt4.x) == (pt1.x - pt2.x) * (pt3.y - pt4.y);
+}
+}
+}
+}