generate figure 1 (db-25 backplane connector) using cetz

2 files changed, 124 insertions, 1056 deletions

diff --git a/electrical-specifications.typ b/electrical-specifications.typ
index 320ec1e..2a9ec15 100644
--- a/electrical-specifications.typ
+++ b/electrical-specifications.typ
@@ -1,4 +1,5 @@
 #import "lib/unify.typ": qty, qtyrange
+#import "@preview/cetz:0.5.2"
 
 = Electrical specifications <electrical-specifications>
 
@@ -573,9 +574,129 @@ the cassette to the power distribution board. D-sub connectors are ubiquitous,
 sturdy and shielded.
 
 #figure(
-  image("pictures/db-25-backplane-connector.svg"),
-  caption: [DB-25 backplane connector],
-) <figure-backplane-connector>
+  cetz.canvas({
+    import cetz.draw: *
+
+    let dx = 1.0
+    let top-y = 0.55
+    let bot-y = -0.55
+
+    // Outer mounting flange / metal ears
+    rect(
+      (-2.0, -1.4),
+      (14.0, 1.4),
+      rx: 0.2,
+      fill: luma(245),
+      stroke: 1pt + luma(100),
+    )
+
+    // Left and right chassis mounting screw holes
+    circle((-1.3, 0), radius: 0.35, fill: luma(220), stroke: 1pt + luma(120))
+    circle((-1.3, 0), radius: 0.20, fill: white, stroke: 0.8pt + luma(100))
+    circle((13.3, 0), radius: 0.35, fill: luma(220), stroke: 1pt + luma(120))
+    circle((13.3, 0), radius: 0.20, fill: white, stroke: 0.8pt + luma(100))
+
+    // D-Sub trapezoidal shroud outline
+    line(
+      (-0.7, 1.15),
+      (12.7, 1.15),
+      (12.2, -1.15),
+      (-0.2, -1.15),
+      close: true,
+      fill: luma(230),
+      stroke: 1.5pt + black,
+    )
+
+    // Shell Earth ground connection reference
+    line((-0.45, -1.15), (-0.45, -2.0), stroke: (
+      paint: luma(120),
+      thickness: 0.7pt,
+      dash: "dashed",
+    ))
+    content(
+      (-0.45, -2.05),
+      text(size: 7.5pt, weight: "bold")[Shell: Chassis Earth],
+      angle: -50deg,
+      anchor: "north-west",
+    )
+
+    // Top row pins (Pins 1 to 13)
+    let top-pins = (
+      ("1", [$plus qty(15.00, "V")$]),
+      ("2", [$plus qty(15.00, "V")$]),
+      ("3", [$qty(-15.00, "V")$]),
+      ("4", [$qty(-15.00, "V")$]),
+      ("5", [AGND]),
+      ("6", [AGND]),
+      ("7", [AGND]),
+      ("8", [$plus qty(10.0000, "V")$ Force]),
+      ("9", [$plus qty(10.0000, "V")$ Sense]),
+      ("10", [$qty(-10.0000, "V")$ Force]),
+      ("11", [$qty(-10.0000, "V")$ Sense]),
+      ("12", [AGND]),
+      ("13", [AGND]),
+    )
+
+    // Bottom row pins (Pins 14 to 25)
+    let bot-pins = (
+      ("14", [AGND]),
+      ("15", [AGND]),
+      ("16", [AGND]),
+      ("17", [DGND]),
+      ("18", [DGND]),
+      ("19", [$plus qty(5.0, "VD")$]),
+      ("20", [$qty(-5.0, "VD")$]),
+      ("21", [Stagger]),
+      ("22", [_Reserved_]),
+      ("23", [_Reserved_]),
+      ("24", [_Reserved_]),
+      ("25", [Chassis Earth]),
+    )
+
+    // Draw Top Pins (1-13)
+    for (i, p) in top-pins.enumerate() {
+      let x = i * dx
+      let p-num = p.at(0)
+      let p-sig = p.at(1)
+
+      circle((x, top-y), radius: 0.26, fill: white, stroke: 1pt + black)
+      content((x, top-y), text(size: 7pt, weight: "bold")[#p-num])
+
+      line((x, top-y + 0.26), (x, 1.8), stroke: (
+        paint: luma(120),
+        thickness: 0.6pt,
+      ))
+      content(
+        (x, 1.85),
+        text(size: 7.5pt)[#p-sig],
+        angle: 50deg,
+        anchor: "south-west",
+      )
+    }
+
+    // Draw Bottom Pins (14-25)
+    for (j, p) in bot-pins.enumerate() {
+      let x = (j + 0.5) * dx
+      let p-num = p.at(0)
+      let p-sig = p.at(1)
+
+      circle((x, bot-y), radius: 0.26, fill: white, stroke: 1pt + black)
+      content((x, bot-y), text(size: 7pt, weight: "bold")[#p-num])
+
+      line((x, bot-y - 0.26), (x, -1.8), stroke: (
+        paint: luma(120),
+        thickness: 0.6pt,
+      ))
+      content(
+        (x, -1.85),
+        text(size: 7.5pt)[#p-sig],
+        angle: -50deg,
+        anchor: "north-west",
+      )
+    }
+  }),
+  caption: [DB-25 backplane connector physical pinout and signal allocation diagram.],
+) <figure-backplane-connector-diagram>
 
 #figure(
   table(
diff --git a/pictures/db-25-backplane-connector.svg b/pictures/db-25-backplane-connector.svg
deleted file mode 100644
index 68f1bc0..0000000
--- a/pictures/db-25-backplane-connector.svg
+++ /dev/null
@@ -1,1053 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   width="864.19604"
-   height="307.85416"
-   style="font-family:serif"
-   version="1.1"
-   id="svg63"
-   inkscape:version="1.4.4 (dcaf3e7d9e, 2026-05-05)"
-   sodipodi:docname="db-25-backplane-connector.svg"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-   xmlns:cc="http://creativecommons.org/ns#">
-  <defs
-     id="defs1" />
-  <sodipodi:namedview
-     id="namedview1"
-     pagecolor="#ffffff"
-     bordercolor="#000000"
-     borderopacity="0.25"
-     inkscape:showpageshadow="2"
-     inkscape:pageopacity="0.0"
-     inkscape:pagecheckerboard="0"
-     inkscape:deskcolor="#d1d1d1"
-     inkscape:zoom="4.6233333"
-     inkscape:cx="123.17952"
-     inkscape:cy="-4.9747657"
-     inkscape:window-width="1920"
-     inkscape:window-height="1011"
-     inkscape:window-x="0"
-     inkscape:window-y="0"
-     inkscape:window-maximized="1"
-     inkscape:current-layer="svg63" />
-  <!-- Title -->
-  <!-- Connector Base / Outer Flange -->
-  <rect
-     x="83.19603"
-     y="100.04389"
-     width="780"
-     height="120"
-     rx="20"
-     fill="#ffffff"
-     stroke="#000000"
-     stroke-width="2"
-     id="rect8" />
-  <!-- Screw Mounting Holes -->
-  <circle
-     cx="118.19603"
-     cy="160.0439"
-     r="14"
-     fill="#ffffff"
-     stroke="#000000"
-     stroke-width="2"
-     id="circle8" />
-  <circle
-     cx="118.19603"
-     cy="160.0439"
-     r="8"
-     fill="#000000"
-     id="circle9" />
-  <circle
-     cx="828.19604"
-     cy="160.0439"
-     r="14"
-     fill="#ffffff"
-     stroke="#000000"
-     stroke-width="2"
-     id="circle10" />
-  <circle
-     cx="828.19604"
-     cy="160.0439"
-     r="8"
-     fill="#000000"
-     id="circle11" />
-  <!-- D-Sub Trapezoidal Shroud -->
-  <path
-     d="m 173.19603,115.04389 h 600 q 15,0 10,15 l -20,60 q -5,15 -20,15 h -540 q -15,0 -20,-15 l -20,-60 q -5,-15 10,-15 z"
-     fill="#ffffff"
-     stroke="#000000"
-     stroke-width="2"
-     id="path11" />
-  <!-- Shell Ground Callout -->
-  <path
-     d="m 163.19603,160.04389 -70,90 h -50"
-     fill="none"
-     stroke="#000000"
-     stroke-width="1.5"
-     stroke-dasharray="4, 4"
-     id="path12" />
-  <text
-     x="35.19603"
-     y="254.0439"
-     text-anchor="middle"
-     fill="#000000"
-     font-size="12px"
-     font-weight="600"
-     id="text12">Shell: Earth</text>
-  <!-- ================= PINS & LEADERS ================= -->
-  <!-- Top Row: Pins 1 to 13 -->
-  <!-- Pin 1 -->
-  <g
-     transform="translate(193.19603,138.04389)"
-     id="g14">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
-       y2="-58"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="line12" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text13">+15.00 V</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle13" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text14">1</text>
-  </g>
-  <!-- Pin 2 -->
-  <g
-     transform="translate(239.79603,138.04389)"
-     id="g16">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
-       y2="-58"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="line14" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text15">+15.00 V</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle15" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text16">2</text>
-  </g>
-  <!-- Pin 3 -->
-  <g
-     transform="translate(286.49603,138.04389)"
-     id="g18">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
-       y2="-58"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="line16" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text17">-15.00 V</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle17" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text18">3</text>
-  </g>
-  <!-- Pin 4 -->
-  <g
-     transform="translate(333.19603,138.04389)"
-     id="g20">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
-       y2="-58"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="line18" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text19">-15.00 V</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle19" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text20">4</text>
-  </g>
-  <!-- Pin 5 -->
-  <g
-     transform="translate(379.79603,138.04389)"
-     id="g22">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
-       y2="-58"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="line20" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text21">AGND</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle21" />
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-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text22">5</text>
-  </g>
-  <!-- Pin 6 -->
-  <g
-     transform="translate(426.49603,138.04389)"
-     id="g24">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
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-       stroke="#000000"
-       stroke-width="1.5"
-       id="line22" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text23">AGND</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle23" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text24">6</text>
-  </g>
-  <!-- Pin 7 -->
-  <g
-     transform="translate(473.19603,138.04389)"
-     id="g26">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
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-       stroke="#000000"
-       stroke-width="1.5"
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-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text25">AGND</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle25" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text26">7</text>
-  </g>
-  <!-- Pin 8 -->
-  <g
-     transform="translate(519.79603,138.04389)"
-     id="g28">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
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-       stroke="#000000"
-       stroke-width="1.5"
-       id="line26" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text27">+10.0000 V Force</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle27" />
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-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text28">8</text>
-  </g>
-  <!-- Pin 9 -->
-  <g
-     transform="translate(566.49603,138.04389)"
-     id="g30">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
-       y2="-58"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="line28" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text29">+10.0000 V Sense</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle29" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text30">9</text>
-  </g>
-  <!-- Pin 10 -->
-  <g
-     transform="translate(613.19603,138.04389)"
-     id="g32">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
-       y2="-58"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="line30" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text31">-10.0000 V Force</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle31" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text32">10</text>
-  </g>
-  <!-- Pin 11 -->
-  <g
-     transform="translate(659.79603,138.04389)"
-     id="g34">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
-       y2="-58"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="line32" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text33">-10.0000 V Sense</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle33" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text34">11</text>
-  </g>
-  <!-- Pin 12 -->
-  <g
-     transform="translate(706.49603,138.04389)"
-     id="g36">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
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-       stroke="#000000"
-       stroke-width="1.5"
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-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text35">AGND</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle35" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text36">12</text>
-  </g>
-  <!-- Pin 13 -->
-  <g
-     transform="translate(753.19603,138.04389)"
-     id="g38">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
-       y2="-58"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="line36" />
-    <text
-       x="-5"
-       y="-63"
-       transform="rotate(-45,-5,-63)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text37">AGND</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle37" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text38">13</text>
-  </g>
-  <!-- Bottom Row: Pins 14 to 25 -->
-  <!-- Pin 14 -->
-  <g
-     transform="translate(216.49603,182.04389)"
-     id="g40">
-    <line
-       x1="0"
-       y1="0"
-       x2="0"
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-       stroke="#000000"
-       stroke-width="1.5"
-       id="line38" />
-    <text
-       x="-5"
-       y="68"
-       transform="rotate(45,-5,68)"
-       fill="#000000"
-       font-size="12px"
-       font-weight="600"
-       id="text39">AGND</text>
-    <circle
-       cx="0"
-       cy="0"
-       r="10"
-       fill="#ffffff"
-       stroke="#000000"
-       stroke-width="1.5"
-       id="circle39" />
-    <text
-       x="0"
-       y="4"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="10px"
-       font-weight="bold"
-       id="text40">14</text>
-  </g>
-  <!-- Pin 15 -->
-  <g
-     transform="translate(263.19603,182.04389)"
-     id="g42">
-    <line
-       x1="0"
-       y1="0"
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-    <text
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-       y="68"
-       transform="rotate(45,-5,68)"
-       fill="#000000"
-       font-size="12px"
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