From 80c44f3436c04089c3b31d5c3cd9f1dd6796f2be Mon Sep 17 00:00:00 2001
From: Max Cahill <1bardesign@gmail.com>
Date: Thu, 13 May 2021 12:24:45 +1000
Subject: [PATCH] [added] `intersect.line_circle_overlap` for checking boolean
 overlap circles vs lines

---
 intersect.lua | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/intersect.lua b/intersect.lua
index 73fbff3..aff416a 100644
--- a/intersect.lua
+++ b/intersect.lua
@@ -85,11 +85,13 @@ function intersect.nearest_point_on_line(a_start, a_end, b_pos, into)
 	return into
 end
 
+--internal
 --vector from line seg to point
 function intersect._line_to_point(a_start, a_end, b_pos, into)
 	return intersect.nearest_point_on_line(a_start, a_end, b_pos, into):vsubi(b_pos)
 end
 
+--internal
 --line displacement vector from separation vector
 function intersect._line_displacement_to_sep(a_start, a_end, separation, total_rad)
 	local distance = separation:normalisei_len()
@@ -106,6 +108,14 @@ function intersect._line_displacement_to_sep(a_start, a_end, separation, total_r
 	return false
 end
 
+--overlap a line segment with a circle
+function intersect.line_circle_overlap(a_start, a_end, a_rad, b_pos, b_rad)
+	local nearest = intersect._line_to_point(a_start, a_end, b_pos, vec2:pooled())
+	local overlapped = intersect.circle_point_overlap(b_pos, a_rad + b_rad, nearest)
+	nearest:release()
+	return overlapped
+end
+
 --collide a line segment with a circle
 function intersect.line_circle_collide(a_start, a_end, a_rad, b_pos, b_rad, into)
 	into = intersect._line_to_point(a_start, a_end, b_pos, into)