From bbdd4f01e185865092a69d0b60ef0e6e5bdef9e7 Mon Sep 17 00:00:00 2001
From: Tom Short <tshort@epri.com>
Date: Tue, 6 May 2025 20:32:49 -0400
Subject: [PATCH] Add a transformer component based on
 https://github.com/fenjalien/cirCeTZ/pull/9/ by Thomas Berteau
 (https://github.com/thoams22).

---
 src/components.typ              |  1 +
 src/components/transformers.typ | 84 +++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 src/components/transformers.typ

diff --git a/src/components.typ b/src/components.typ
index 9dec4b6..54fa478 100644
--- a/src/components.typ
+++ b/src/components.typ
@@ -11,4 +11,5 @@
 #import "/src/components/resistive-bipoles.typ": *
 #import "/src/components/sources.typ": *
 #import "/src/components/terminal-shapes.typ": *
+#import "/src/components/transformers.typ": *
 #import "/src/components/transistors.typ": *
diff --git a/src/components/transformers.typ b/src/components/transformers.typ
new file mode 100644
index 0000000..3045e76
--- /dev/null
+++ b/src/components/transformers.typ
@@ -0,0 +1,84 @@
+#import "../component.typ": component
+#import "inductors.typ": inductor
+#import "../dependencies.typ": cetz
+
+#import cetz.draw: *
+
+#let transformers(
+  style,
+  ..inputs
+) = component(
+  "transformers",
+  (style) => {
+    let height = style.height
+    let height2 = style.height / 2
+    let height8 = style.height / 8
+
+    let width2 = style.width / 2
+    let width4 = style.width / 4
+    let width8 = style.width / 8
+
+    anchor("text", (
+      0,
+      height2
+    ))
+
+    anchor("A1", (-width2, height2))  
+    anchor("A2", (-width2, -height2))
+  
+    anchor("B1", (width2, height2))  
+    anchor("B2", (width2, -height2))
+
+    line("A1", (rel: (width4, 0)), stroke: style.stroke.thickness)
+    inductor((), (rel: (0, -height)), width: width2, name: "inductor1")
+    line((), "A2", stroke: style.stroke.thickness)
+
+    line("B1", (rel: (-width4, 0)), stroke: style.stroke.thickness)
+    inductor((), (rel: (0, -height)), width: width2, mirror: true, name: "inductor2")
+    line((), "B2", stroke: style.stroke.thickness)
+
+
+    anchor("inner dot A1", (-width8, height2 - height8))  
+    anchor("inner dot A2", (-width8, -height2 + height8))
+  
+    anchor("inner dot B1", (width8, height2 - height8))  
+    anchor("inner dot B2", (width8, -height2 + height8))
+
+    let idot = inputs.named().at("inner-dot", default: (:))
+
+    for i in idot {
+      assert(i in ("A1", "A2", "B1", "B2"),  message: "Dot must be A1 or A2 or B1 or B2")      
+      circle("inner dot " + i, radius: height / 40, fill: black)
+    }
+
+    anchor("outer dot A1", (-width4 - width8, height2 - height8))  
+    anchor("outer dot A2", (-width4 - width8, -height2 + height8))
+  
+    anchor("outer dot B1", (width4 + width8, height2 - height8))  
+    anchor("outer dot B2", (width4 + width8, -height2 + height8))
+
+    let odot = inputs.named().at("outer-dot", default: (:))
+
+    for i in odot {
+      assert(i in ("A1", "A2", "B1", "B2"),  message: "Dot must be A1 or A2 or B1 or B2")      
+      circle("outer dot " + i, radius: height / 40, fill: black)
+    }
+
+    let core = inputs.named().at("core", default: false) 
+
+    if core {
+      line((style.width / 24, height / 4), (rel :(0, -height2)), stroke: style.stroke.thickness)
+      line((-style.width / 24, height / 4), (rel :(0, -height2)), stroke: style.stroke.thickness)
+    }
+  },
+    (
+    stroke: auto,
+    thickness: auto,
+    scale: auto,
+    width: 1.2,
+    height: 1.5,
+  ),
+  ..inputs
+)
+
+#let transformer = transformers.with((style: auto))