find_arc_centre given vectors

2 files changed, 6 insertions, 0 deletions

diff --git a/utility/maths.cpp b/utility/maths.cpp
index bda6ea6..866097a 100644
--- a/utility/maths.cpp
+++ b/utility/maths.cpp
@@ -69,7 +69,12 @@ find_arc_centre(glm::vec2 as, float entrys, glm::vec2 bs, float entrye)
 	const auto perpe = entrye - half_pi;
 	const glm::vec2 ad {std::sin(perps), std::cos(perps)};
 	const glm::vec2 bd {std::sin(perpe), std::cos(perpe)};
+	return find_arc_centre(as, ad, bs, bd);
+}
 
+std::pair<glm::vec2, bool>
+find_arc_centre(glm::vec2 as, glm::vec2 ad, glm::vec2 bs, glm::vec2 bd)
+{
 	const auto det = bd.x * ad.y - bd.y * ad.x;
 	if (det != 0) { // near parallel line will yield noisy results
 		const auto d = bs - as;
diff --git a/utility/maths.h b/utility/maths.h
index 47b95a3..2ce5d94 100644
--- a/utility/maths.h
+++ b/utility/maths.h
@@ -54,5 +54,6 @@ arc_length(const Arc & arc)
 float normalize(float ang);
 
 std::pair<glm::vec2, bool> find_arc_centre(glm::vec2 start, float entrys, glm::vec2 end, float entrye);
+std::pair<glm::vec2, bool> find_arc_centre(glm::vec2 start, glm::vec2 ad, glm::vec2 end, glm::vec2 bd);
 
 #endif