shapes: Transform content angle coordinate

Fixes #1032

Author: johannes-wolf

CHANGES.md

@@ -22,6 +22,8 @@
 - New `perspective` element for perspective division.
   There is a known issue with intersections of perspective elements
   outsides the `perspective` environment! (#1033)
+- Fixed a bug when passing a coordinate to the `angle:` argument of
+  `content` and a transformation matrix ≠ id.
 
 # 0.4.2
 - The `tree` element now has a `anchor:` argument to position the tree (#929)

src/draw/shapes.typ

@@ -1125,9 +1125,8 @@
     }
 
     let angle = if type(angle) != std.angle {
-      let c
-      (ctx, c) = coordinate.resolve(ctx, angle)
-      vector.angle2(a, c)
+      let (_, c) = coordinate.resolve(ctx, angle)
+      vector.angle2(a, util.apply-transform(ctx.transform, c))
     } else {
       angle
     }

tests/content/rotation/ref/1.png

@@ -19,3 +19,13 @@
     content((0,0), [Content], angle: pt)
   })
 }
+
+// Rotate to coordinate with transformation != id (#1032)
+#test-case({
+  import draw: *
+
+  line((0, 0), (1, 0), name: "a")
+  rotate(90deg)
+  line((0, 0), (1, 0), name: "b")
+  content((0,0), [Content], angle: "a.end")
+})