diff options
Diffstat (limited to 'include/mbgl/util/unitbezier.hpp')
| -rw-r--r-- | include/mbgl/util/unitbezier.hpp | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/include/mbgl/util/unitbezier.hpp b/include/mbgl/util/unitbezier.hpp index 3a4994917b..92f23d6718 100644 --- a/include/mbgl/util/unitbezier.hpp +++ b/include/mbgl/util/unitbezier.hpp @@ -26,6 +26,7 @@ #pragma once #include <cmath> +#include <tuple> namespace mbgl { namespace util { @@ -34,11 +35,11 @@ struct UnitBezier { // Calculate the polynomial coefficients, implicit first and last control points are (0,0) and (1,1). constexpr UnitBezier(double p1x, double p1y, double p2x, double p2y) : cx(3.0 * p1x) - , bx(3.0 * (p2x - p1x) - cx) - , ax(1.0 - cx - bx) + , bx(3.0 * (p2x - p1x) - (3.0 * p1x)) + , ax(1.0 - (3.0 * p1x) - (3.0 * (p2x - p1x) - (3.0 * p1x))) , cy(3.0 * p1y) - , by(3.0 * (p2y - p1y) - cy) - , ay(1.0 - cy - by) { + , by(3.0 * (p2y - p1y) - (3.0 * p1y)) + , ay(1.0 - (3.0 * p1y) - (3.0 * (p2y - p1y) - (3.0 * p1y))) { } double sampleCurveX(double t) const { @@ -102,6 +103,11 @@ struct UnitBezier { double solve(double x, double epsilon) const { return sampleCurveY(solveCurveX(x, epsilon)); } + + bool operator==(const UnitBezier& rhs) const { + return std::tie(cx, bx, ax, cy, by, ay) == + std::tie(rhs.cx, rhs.bx, rhs.ax, rhs.cy, rhs.by, rhs.ay); + } private: const double cx; |