diff --git a/gallery/target_api.pdf b/gallery/target_api.pdf
new file mode 100644
index 0000000..e56479d
Binary files /dev/null and b/gallery/target_api.pdf differ
diff --git a/gallery/target_api.typ b/gallery/target_api.typ
new file mode 100644
index 0000000..991caf9
--- /dev/null
+++ b/gallery/target_api.typ
@@ -0,0 +1,297 @@
+#import "../src/lib.typ": *
+#import "@preview/cetz:0.3.4": draw
+#circuit({
+  element.block(
+    size: (1.5, 2.2),
+    id: "PCBuf",
+    fill: util.colors.orange,
+    ports: (
+      west: "PCNext",
+      north: (id: "CLK", clock: true),
+      east: "PC",
+      south: (("EN", "EN"),)
+    ),
+    debug: (ports: true)
+  )
+
+  element.block(
+    size: (1, 2),
+    ports: (
+      west: (("a", "A"), "e"),
+      north: "b",
+      east: "c",
+      south: "d"
+    ),
+    pos: (
+      (offset: -1, from: "PCBuf.south"),
+      2,//(align: "e", with: "PCBuf.EN"),
+    )
+  )
+  
+  /*
+  wire.stub("PCBuf.CLK", name: "CLK")
+  wire.stub("PCBuf.EN", name: "PCWrite")
+  
+  element.multiplexer(
+    pos: (
+      3, (align: "in0", with: "PCBuf.PC")
+    ),
+    size: (1, 2),
+    id: "AdrSrc-MP",
+    fill: util.colors.orange,
+    entries: 2
+  )
+  wire.wire(
+    "PCBuf.PC",
+    "AdrSrc-MP.in0",
+    id: "wPCBuf-InstDataMgr",
+    name: "PC",
+    bus: true
+  )
+  wire.stub("AdrSrc-MP.north", name: "AdrSrc")
+  
+  element.block(
+    pos: (
+      6, (align: "A", with: "AdrSrc-MP.out")
+    ),
+    size: (3, 4),
+    id: "InstDataMgr",
+    fill: util.colors.yellow,
+    ports: (
+      west: (
+        ("A", "A"),
+        ("WD", "WD")
+      ),
+      north: (
+        (id: "CLK", clock: true),
+        (id: "WE", name: "WE", vertical: true),
+        (id: "IRWrite", name: "IRWrite", vertical: true)
+      ),
+      east: (
+        ("Instr", "Instr."),
+        ("RD", "RD")
+      )
+    ),
+    ports-margins: (
+      west: (30%, 0%),
+      east: (40%, 0%)
+    )
+  )
+  wire.wire(
+    "AdrSrc-MP.out",
+    "InstDataMgr.A",
+    id: "wAdrSrcMP-InstDataMgr",
+    name: (none, "Adr"),
+    bus: true
+  )
+  
+  wire.stub("InstDataMgr.CLK", name: "CLK")
+  wire.stub("InstDataMgr.WE")
+  wire.stub("InstDataMgr.IRWrite")
+  wire.stub("InstDataMgr.WD")
+
+  element.block(
+    pos: (
+      15, (align: "WD3", with: "InstDataMgr.RD")
+    ),
+    size: (3, 4),
+    id: "RegFile",
+    fill: util.colors.pink,
+    ports: (
+      west: (
+        ("A1", "A1"),
+        ("A2", "A2"),
+        ("A3", "A3"),
+        ("WD3", "WD3"),
+      ),
+      north: (
+        (id: "CLK", clock: true),
+        (id: "WE3", name: "WE3", vertical: true)
+      ),
+      east: (
+        ("RD1", "RD1"),
+        ("RD2", "RD2"),
+      )
+    ),
+    ports-margins: (
+      east: (20%, 20%)
+    )
+  )
+  wire.stub("RegFile.CLK", name: "CLK")
+  wire.stub("RegFile.WE3", name: "Regwrite", name-offset: 0.6)
+  wire.stub("RegFile.A2")
+  wire.stub("RegFile.RD2")
+
+  element.extender(
+    pos: (15, -3.5),
+    size: (3, 1),
+    id: "Extender",
+    fill: util.colors.green
+  )
+  wire.wire(
+    "Extender.north",
+    (18, -2),
+    id: "wExtender-ImmSrc",
+    style: "zigzag",
+    zigzag-ratio: 0%,
+    name: (none, "ImmSrc"),
+    bus: true
+  )
+
+  let mid = ("InstDataMgr.east", 50%, "RegFile.west")
+  wire.wire(
+    "InstDataMgr.Instr",
+    (vertical: (), horizontal: mid),
+    id: "wInstDataMgr-Bus"
+    name: ("Instr", none),
+    bus: true
+  )
+  wire.wire(
+    (v => (v.at(0), -3.5), mid),
+    (horizontal: (), vertical: (0, 3.5)),
+    id: "wBus",
+    bus: true
+  )
+  wire.wire(
+    "RegFile.A1",
+    (horizontal: mid, vertical: ()),
+    id: "wBus-RegFile-A1"
+    name: (none, "RS1"),
+    slice: (19, 15),
+    reverse: true,
+    bus: true
+  )
+  wire.wire(
+    "RegFile.A3",
+    (horizontal: mid, vertical: ()),
+    id: "wBus-RegFile-A3"
+    name: (none, "RD"),
+    slice: (11, 7),
+    reverse: true,
+    bus: true
+  )
+  wire.wire(
+    "Extender.in",
+    (horizontal: mid, vertical: ()),
+    id: "wBus-Extender"
+    slice: (31, 7),
+    reverse: true,
+    bus: true
+  )
+
+  element.alu(
+    pos: (
+      22, (align: "in1", with: "RegFile.RD1")
+    ),
+    size: (1, 2),
+    id: "ALU",
+    fill: util.colors.purple
+  )
+  wire.wire(
+    "RegFile.RD1",
+    "ALU.in1",
+    id: "wRegFile-ALU"
+    name: ("A", "SrcA"),
+    bus: true
+  )
+
+  element.block(
+    pos: (
+      26, (align: "in", with: "ALU.out")
+    ),
+    size: (1.5, 2),
+    id: "OutBuf",
+    fill: util.colors.orange,
+    ports: (
+      west: "in",
+      north: (id: "CLK", clock: true),
+      east: "out"
+    )
+  )
+  wire.stub("OutBuf.CLK", name: "CLK")
+  wire.wire(
+    "ALU.out",
+    "OutBuf.in",
+    id: "wALU-OutBuf"
+    name: "ALUResult",
+    bus: true
+  )
+
+  element.multiplexer(
+    pos: (
+      30, (align: "in0", with: "OutBuf.out")
+    ),
+    size: (1, 2.5),
+    id: "Res-MP",
+    fill: util.colors.orange,
+    entries: 3
+  )
+  wire.stub("Res-MP.north", name: "ResultSrc")
+  wire.stub("Res-MP.in2")
+  wire.wire(
+    "OutBuf.out",
+    "Res-MP.in0",
+    id: "wOutBuf-ResMP"
+    name: "ALUOut",
+    bus: true
+  )
+
+  wire.wire(
+    "Extender.out",
+    "ALU.in2",
+    id: "wExt-ALU"
+    name: ("ImmExt", "SrcB"),
+    bus: true,
+    style: "zigzag",
+    zigzag-ratio: 60%
+  )
+
+  wire.wire(
+    "InstDataMgr.RD",
+    "Res-MP.in1",
+    id: "wInstDataMgr-ResMP"
+    style: "dodge",
+    dodge-y: -4,
+    dodge-sides: ("east", "west"),
+    name: ("Data", none),
+    bus: true
+  )
+
+  wire.wire(
+    "Res-MP.out",
+    "AdrSrc-MP.in1",
+    id: "wResMP-AdrSrc"
+    style: "dodge",
+    dodge-y: -5,
+    dodge-sides: ("east", "west"),
+    dodge-margins: (0.5, 1),
+    bus: true
+  )
+
+  wire.wire(
+    "Res-MP.out",
+    "RegFile.WD3",
+    id: "wResMP-RegFile"
+    style: "dodge",
+    dodge-y: -5,
+    dodge-sides: ("east", "west"),
+    dodge-margins: (0.5, 1),
+    bus: true
+  )
+
+  wire.wire(
+    "Res-MP.out",
+    "PCBuf.PCNext",
+    id: "wResMP-PCBuf"
+    style: "dodge",
+    dodge-y: -5,
+    dodge-sides: ("east", "west"),
+    dodge-margins: (0.5, 1.5),
+    name: (none, "PCNext"),
+    bus: true
+  )
+
+  wire.intersection("wResMP-RegFile.dodge-end", radius: .2)
+  wire.intersection("wResMP-AdrSrc.dodge-end", radius: .2)
+  */
+})
\ No newline at end of file
diff --git a/src/circuit.typ b/src/circuit.typ
index 7a701c7..bdf6184 100644
--- a/src/circuit.typ
+++ b/src/circuit.typ
@@ -9,6 +9,38 @@
 /// - length (length, ratio): Optional base unit
 /// -> none
 #let circuit(body, length: 2em) = {
-  set text(font: "Source Sans 3")
-  canvas(length: length, body)
+  let next-id = 0
+  let elements = (:)
+
+  for element in body {
+    let internal = type(element) == dictionary and "id" in element
+    let eid = if internal {element.id} else {none}
+    if eid == none {
+      while str(next-id) in elements {
+        next-id += 1
+      }
+      eid = str(next-id)
+      if internal {
+        element.id = eid
+      }
+      next-id += 1
+    }
+    elements.insert(eid, element)
+  }
+
+  for element in elements.values() {
+    if type(element) == dictionary and "pre-process" in element {
+      elements = (element.pre-process)(elements, element)
+    }
+  }
+
+  canvas(length: length, {
+    for element in elements.values() {
+      if type(element) == dictionary and "draw" in element {
+        (element.draw)(element)
+      } else {
+        (element,)
+      }
+    }
+  })
 }
\ No newline at end of file
diff --git a/src/elements/block.typ b/src/elements/block.typ
index 84623fe..58a1b6f 100644
--- a/src/elements/block.typ
+++ b/src/elements/block.typ
@@ -1,16 +1,15 @@
 #import "@preview/cetz:0.3.2": draw
 #import "element.typ"
 
-#let draw-shape(id, tl, tr, br, bl, fill, stroke) = {
+#let draw-shape(elmt, bounds) = {
   let f = draw.rect(
     radius: 0.5em,
     inset: 0.5em,
-    fill: fill,
-    stroke: stroke,
-    name: id,
-    bl, tr
+    fill: elmt.fill,
+    stroke: elmt.stroke,
+    bounds.bl, bounds.tr
   )
-  return (f, tl, tr, br, bl)
+  return (f, bounds)
 }
 
 /// Draws a block element
@@ -18,32 +17,8 @@
 /// #examples.block
 /// For parameters description, see #doc-ref("element.elmt")
 #let block(
-  x: none,
-  y: none,
-  w: none,
-  h: none,
-  name: none,
-  name-anchor: "center",
-  ports: (),
-  ports-margins: (),
-  fill: none,
-  stroke: black + 1pt,
-  id: "",
-  debug: (
-    ports: false
-  )
+  ..args
 ) = element.elmt(
   draw-shape: draw-shape,
-  x: x,
-  y: y,
-  w: w,
-  h: h,
-  name: name,
-  name-anchor: name-anchor,
-  ports: ports,
-  ports-margins: ports-margins,
-  fill: fill,
-  stroke: stroke,
-  id: id,
-  debug: debug
+  ..args
 )
\ No newline at end of file
diff --git a/src/elements/element.typ b/src/elements/element.typ
index 635fc0b..2dc0bb6 100644
--- a/src/elements/element.typ
+++ b/src/elements/element.typ
@@ -1,4 +1,4 @@
-#import "@preview/cetz:0.3.2": draw, coordinate
+#import "@preview/cetz:0.3.2": draw, coordinate, matrix, vector
 #import "ports.typ": add-ports, add-port
 #import "../util.typ"
 
@@ -13,10 +13,163 @@
   panic("Could not find port with id " + str(id))
 }
 
-#let default-draw-shape(id, tl, tr, br, bl, fill, stroke) = {
-  return ({}, tl, tr, br, bl)
+#let local-to-global(origin, u, v, points) = {
+  return points-real = points.map(p => {
+    let (pu, pv) = p
+    return vector.add(
+      origin,
+      vector.add(
+        vector.scale(u, pu),
+        vector.scale(v, pv)
+      )
+    )
+  })
 }
 
+#let default-draw-shape(elmt, bounds) = {
+  return ({}, bounds)
+}
+
+#let default-pre-process(elements, element) = {
+  return elements
+}
+
+#let resolve-offset(ctx, offset, from, axis) = {
+  let (ctx, pos) = coordinate.resolve(
+    ctx,
+    (rel: offset, to: from)
+  )
+  return pos.at(axis)
+}
+
+#let resolve-align(ctx, elmt, align, with, axis) = {
+  let (align-side, i) = find-port(elmt.ports, align)
+  let margins = (0%, 0%)
+  if align-side in elmt.ports-margins {
+    margins = elmt.ports-margins.at(align-side)
+  }
+
+  let parallel-sides = (
+    ("north", "south"),
+    ("west", "east")
+  ).at(axis)
+
+  let ortho-sides = (
+    ("west", "east"),
+    ("north", "south")
+  ).at(axis)
+
+  let dl
+  let start-margin
+  let len = elmt.size.at(axis)
+  if align-side in parallel-sides {
+    let used-pct = 100% - margins.at(0) - margins.at(1)
+    let used-len = len * used-pct / 100%
+    start-margin = len * margins.at(0) / 100%
+    
+    dl = used-len * (i + 1) / (elmt.ports.at(align-side).len() + 1)
+
+    if not elmt.auto-ports {
+      start-margin = 0
+      dl = elmt.ports-pos.at(with)(len)
+    }
+  } else if align-side == ortho-sides.first() {
+    dl = 0
+    start-margin = 0
+  } else {
+    dl = len
+    start-margin = 0
+  }
+
+  if axis == 1 {
+    dl = len - dl
+  }
+  
+  let (ctx, with-pos) = coordinate.resolve(ctx, with)
+  return with-pos.at(axis) - dl + start-margin
+}
+
+#let resolve-coordinate(ctx, elmt, coord, axis) = {
+  if type(coord) == dictionary {
+    let offset = coord.at("offset", default: none)
+    let from = coord.at("from", default: none)
+    let align = coord.at("align", default: none)
+    let with = coord.at("with", default: none)
+
+    if none not in (offset, from) {
+      if type(offset) != array {
+        let a = (0, 0)
+        a.at(axis) = offset
+        offset = a
+      }
+      return resolve-offset(ctx, offset, from, axis)
+      
+    } else if none not in (align, with) {
+      return resolve-align(ctx, elmt, align, with, axis)
+    } else {
+      panic("Dictionnary must either provide both 'offset' and 'from', or 'align' and 'with'")
+    }
+  }
+  if type(coord) not in (int, float, length) {
+    panic("Invalid " + "xy".at(axis) + " coordinate: " + repr(coord))
+  }
+  return coord
+}
+
+#let make-bounds(x, y, w, h) = {
+  let w2 = w / 2
+  let h2 = h / 2
+  
+  return (
+    bl: (x, y),
+    tl: (x, y + h),
+    tr: (x + w, y + h),
+    br: (x + w, y),
+    center: (x + w2, y + h2),
+    b: (x + w2, y),
+    t: (x + w2, y + h),
+    l: (x, y + h2),
+    r: (x + w, y + h2),
+  )
+}
+
+#let render(draw-shape, elmt) = draw.group(name: elmt.id, ctx => {
+  let width = elmt.size.first()
+  let height = elmt.size.last()
+
+  let x = elmt.pos.first()
+  let y = elmt.pos.last()
+
+  x = resolve-coordinate(ctx, elmt, x, 0)
+  y = resolve-coordinate(ctx, elmt, y, 1)
+
+  let bounds = make-bounds(x, y, width, height)
+
+  // Workaround because CeTZ needs to have all draw functions in the body
+  let func = {}
+  (func, bounds) = draw-shape(elmt, bounds)
+  func
+
+  if elmt.name != none {
+    draw.content(
+      (name: elmt.id, anchor: elmt.name-anchor),
+      anchor: if elmt.name-anchor in util.valid-anchors {elmt.name-anchor} else {"center"},
+      padding: 0.5em,
+      align(center)[*#elmt.name*]
+    )
+  }
+
+  if elmt.auto-ports {
+    add-ports(
+      elmt.id,
+      bounds,
+      elmt.ports,
+      elmt.ports-margins,
+      debug: elmt.debug.ports
+    )
+  }
+})
+
 /// Draws an element
 /// - draw-shape (function): Draw function
 /// - x (number, dictionary): The x position (bottom-left corner).
@@ -46,10 +199,9 @@
 ///     - `ports`: if true, shows dots on all ports of the element
 #let elmt(
   draw-shape: default-draw-shape,
-  x: none,
-  y: none,
-  w: none,
-  h: none,
+  pre-process: default-pre-process,
+  pos: (0, 0),
+  size: (1, 1),
   name: none,
   name-anchor: "center",
   ports: (:),
@@ -62,84 +214,42 @@
   debug: (
     ports: false
   )
-) = draw.get-ctx(ctx => {
-  let width = w
-  let height = h
-
-  let x = x
-  let y = y
-  if x == none { panic("Parameter x must be set") }
-  if y == none { panic("Parameter y must be set") }
-  if w == none { panic("Parameter w must be set") }
-  if h == none { panic("Parameter h must be set") }
-
-  if (type(x) == dictionary) {
-    let offset = x.rel
-    let to = x.to
-    let (ctx, to-pos) = coordinate.resolve(ctx, (rel: (offset, 0), to: to))
-    x = to-pos.at(0)
-  }
-  
-  if (type(y) == dictionary) {
-    let from = y.from
-    let to = y.to
-    let (to-side, i) = find-port(ports, to)
-    let margins = (0%, 0%)
-    if to-side in ports-margins {
-      margins = ports-margins.at(to-side)
+) = {
+  for (key, side-ports) in ports.pairs() {
+    if type(side-ports) == str {
+      side-ports = ((id: side-ports),)
+    } else if type(side-ports) == dictionary {
+      side-ports = (side-ports,)
     }
 
-    let dy
-    let top-margin
-    if to-side in ("east", "west") {
-      let used-pct = 100% - margins.at(0) - margins.at(1)
-      let used-height = height * used-pct / 100%
-      top-margin = height * margins.at(0) / 100%
-      
-      dy = used-height * (i + 1) / (ports.at(to-side).len() + 1)
-
-      if not auto-ports {
-        top-margin = 0
-        dy = ports-y.at(to)(height)
+    for (i, port) in side-ports.enumerate() {
+      if type(port) == array {
+        side-ports.at(i) = (
+          id: port.at(0, default: ""),
+          name: port.at(1, default: "")
+        )
+      } else if type(port) == str {
+        side-ports.at(i) = (id: port)
       }
-    } else if to-side == "north" {
-      dy = 0
-      top-margin = 0
-    } else if to-side == "south" {
-      dy = height
-      top-margin = 0
     }
-    
-    let (ctx, from-pos) = coordinate.resolve(ctx, from)
-    y = from-pos.at(1) + dy - height + top-margin
+    ports.at(key) = side-ports
   }
 
-  let tl = (x, y + height)
-  let tr = (x + width, y + height)
-  let br = (x + width, y)
-  let bl = (x, y)
 
-  // Workaround because CeTZ needs to have all draw functions in the body
-  let func = {}
-  (func, tl, tr, br, bl) = draw-shape(id, tl, tr, br, bl, fill, stroke)
-  func
-
-  if (name != none) {
-    draw.content(
-      (name: id, anchor: name-anchor),
-      anchor: if name-anchor in util.valid-anchors {name-anchor} else {"center"},
-      padding: 0.5em,
-      align(center)[*#name*]
-    )
-  }
-
-  if auto-ports {
-    add-ports(
-      id,
-      tl, tr, br, bl,
-      ports,
-      ports-margins,
-      debug: debug.ports
-    )
-  }
-})
\ No newline at end of file
+  return ((
+    id: id,
+    draw: render.with(draw-shape),
+    pre-process: pre-process,
+    pos: pos,
+    size: size,
+    name: name,
+    name-anchor: name-anchor,
+    ports: ports,
+    ports-margins: ports-margins,
+    fill: fill,
+    stroke: stroke,
+    auto-ports: auto-ports,
+    ports-y: ports-y,
+    debug: debug
+  ),)
+}
diff --git a/src/elements/ports.typ b/src/elements/ports.typ
index 951fa4a..66d1f0c 100644
--- a/src/elements/ports.typ
+++ b/src/elements/ports.typ
@@ -34,12 +34,10 @@
     angle: if name-rotate {90deg} else {0deg},
     name
   )
-  let id = elmt-id + "-port-" + port.at("id")
 
   if debug {
     draw.circle(
       pos,
-      name: id,
       radius: .1,
       stroke: none,
       fill: red
@@ -49,24 +47,24 @@
     draw.hide(draw.circle(
       pos,
       radius: 0,
-      stroke: none,
-      name: id
+      stroke: none
     ))
   }
+  draw.anchor(port.id, pos)
 }
 
 #let add-ports(
   elmt-id,
-  tl, tr, br, bl,
+  bounds,
   ports,
   ports-margins,
   debug: false
 ) = {
   let sides = (
-    "north": (tl, tr),
-    "east": (tr, br),
-    "south": (bl, br),
-    "west": (tl, bl)
+    "north": (bounds.tl, bounds.tr),
+    "east": (bounds.tr, bounds.br),
+    "south": (bounds.bl, bounds.br),
+    "west": (bounds.tl, bounds.bl)
   )
 
   if type(ports) != dictionary {