fixed wrong capacitor symbol

(no comment...)

src/elements/electrical/capacitor.typ

@@ -2,8 +2,79 @@
 #import "../element.typ"
 #import "../ports.typ": add-port
 
-#let draw-shape(id, tl, tr, br, bl, fill, stroke) = {
-  let f = draw.rect(tl, br, name: id, stroke: stroke, fill: fill)
+#let draw-shape(
+  id, tl, tr, br, bl,
+  fill, stroke,
+  vertical: false,
+  gap: 0.2,
+  scales: (100%, 100%),
+  symbols: (none, none)
+) = {
+  let (x0, y0) = tl
+  let (x1, y1) = br
+
+  let w = x1 - x0
+  let h = y1 - y0
+
+  let (o0, s0) = if vertical {(y0, h)} else {(x0, w)}
+  let (o1, s1) = if vertical {(x0, w)} else {(y0, h)}
+  let m1 = o1 + s1 / 2
+
+  let pt(i, j) = if vertical {
+    (j, i)
+  } else {
+    (i, j)
+  }
+
+  let size0 = s1 * scales.first() / 100%
+  let size1 = s1 * scales.last() / 100%
+
+  if type(gap) == ratio {
+    gap = gap / 100%
+  } else {
+    gap = gap / calc.abs(s0)
+  }
+  let r0 = 0.5 - gap / 2
+  let r1 = 0.5 + gap / 2
+
+  // Coordinates in (main axis, secondary axis) format
+  let p0 = pt(o0, m1)
+  let p1 = pt(o0 + r0 * s0, m1)
+  let p2 = pt(o0 + r1 * s0, m1)
+  let p3 = pt(o0 + s0, m1)
+  
+  let p4 = pt(o0 + r0 * s0, m1 - size0 / 2)
+  let p5 = pt(o0 + r0 * s0, m1 + size0 / 2)
+  
+  let p6 = pt(o0 + r1 * s0, m1 - size1 / 2)
+  let p7 = pt(o0 + r1 * s0, m1 + size1 / 2)
+
+  let line = draw.line.with(stroke: stroke)
+  let f = draw.group(name: id, {
+    line(p0, p1)
+    line(p2, p3)
+    line(p4, p5)
+    line(p6, p7)
+
+    if symbols.first() != none {
+      draw.content(
+        p1,
+        symbols.first(),
+        anchor: if vertical {"south-west"} else {"south-east"},
+        padding: 2pt
+      )
+    }
+
+    if symbols.last() != none {
+      draw.content(
+        p2,
+        symbols.last(),
+        anchor: if vertical {"north-west"} else {"south-west"},
+        padding: 2pt
+      )
+    }
+  })
+
   return (f, tl, tr, br, bl)
 }
 
@@ -11,7 +82,14 @@
 ///
 /// #examples.capacitor
 /// For other parameters description, see #doc-ref("element.elmt")
-/// - vertical (bool): Whether the element is vertical or horizontal. If false, port 0 is placed on the west side and port 1 on the east. If true, they are on the north, respectively the south sides
+/// - vertical (bool): Whether the element is vertical or horizontal.
+///   - If false, port 0 is placed on the west side and port 1 on the east.\
+///   - If true, they are on the north, respectively the south sides
+/// - gap (number, ratio): The gap between both sides
+///   - if it is a number (int or float), it is interpreted as an absolute canvas-unit length
+///   - if it is a ratio, it is interpreted as proportional to the capacitor's length (width if horizontal, height if vertical)
+/// - scales (array): A pair of ratios, the sizes of the sides relative to the capacitor's height (width if vertical).
+/// - symbols (array): A pair of content or strings (or none values) to attach on the sides of the capacitor
 #let capacitor(
   x: none,
   y: none,
@@ -20,6 +98,9 @@
   name: none,
   name-anchor: "center",
   vertical: false,
+  gap: 0.2,
+  scales: (100%, 100%),
+  symbols: (none, none),
   fill: none,
   stroke: black + 1pt,
   id: "",
@@ -36,7 +117,12 @@
   )}
   
   element.elmt(
-    draw-shape: draw-shape.with(),
+    draw-shape: draw-shape.with(
+      vertical: vertical,
+      gap: gap,
+      scales: scales,
+      symbols: symbols
+    ),
     x: x,
     y: y,
     w: w,