Fix line-content intersection (#677)

* Fix #621

* Update ref images

CHANGES.md

@@ -20,6 +20,7 @@ package called `cetz-plot`.
 - The center anchor of `content()` with two coordinates got fixed when using
   negative cordinates.
 - Element names are now checked to not contain a "." character.
+- Fixed intersection bug for content with `anchor:` set.
 
 ## Draw
 - Added `floating` function for drawing elements without affecting bounding boxes.

src/draw/shapes.typ

@@ -515,7 +515,7 @@
     let (ta, tb) = util.apply-transform(ctx.transform, a, b)
 
     let pts = ()
-    for drawable in elem.at("drawables", default: ()) {
+    for drawable in elem.at("drawables", default: ()).filter(d => d.type == "path") {
       pts += intersection.line-path(ta, tb, drawable)
     }
     return if pts == () {

tests/content/intersection/test.typ

@@ -19,3 +19,31 @@
     })
   })
 })
+
+#test-case({
+  import draw: *
+
+  draw.content(name: "test1", frame: "rect", (0,0))[Test 1]
+  draw.content(name: "test2", frame: "rect", (-1,-1))[Test 2]
+  draw.line("test1", "test2")
+})
+
+#test-case({
+  let thide = hide
+  import draw: *
+
+  draw.content(name: "test1", (0,0))[Test 1]
+  draw.content((-1,-1))[#box(stroke: 1pt + red, thide[Test 2])]
+  draw.content(name: "test2", frame: "rect", anchor: "north-east", (-1,-1))[Test 2]
+  draw.line("test1", "test2")
+})
+
+#test-case({
+  let thide = hide
+  import draw: *
+
+  draw.content(name: "test1", (0,0))[Test 1]
+  draw.content((-1,-1))[#box(stroke: 1pt + red, thide[Test 2])]
+  draw.content(name: "test2", frame: "rect", anchor: "south", (-1,-1))[Test 2]
+  draw.line("test1", "test2")
+})