Fix vector.angle2 argument order

cetz-package · Nov 22, 2023 · fb54cf2 · fb54cf2
1 parent 37371a9
commit fb54cf2
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Showing 2 changed files with 4 additions and 3 deletions.
diff --git a/src/lib/angle.typ b/src/lib/angle.typ
@@ -54,9 +54,9 @@
     message: "Angle z coordinates of all three points must be equal")
 
   let (s, e, ss) = {
-    let s = vector.angle2(origin, a) * -1
+    let s = vector.angle2(origin, a)
     if s < 0deg { s += 360deg }
-    let e = vector.angle2(origin, b) * -1
+    let e = vector.angle2(origin, b)
     if e < 0deg { e += 360deg }
 
     if s > e {

diff --git a/src/vector.typ b/src/vector.typ
@@ -89,7 +89,8 @@
 
 /// Calculate angle between two points and the x-axis in 2d space
 #let angle2(a, b) = {
-  return calc.atan2(a.at(1) - b.at(1), a.at(0) - b.at(0)) + 90deg
+  // Typst's atan2 is (x, y) order, not (y, x)
+  return calc.atan2(b.at(0) - a.at(0), b.at(1) - a.at(1))
 }
 
 /// Calculate angle between three points