Fix stroke width calculation (#84)

* Fix stroke width calculation

* Update easyeda ref link, format

* REmove console log

* Rename easyEdaUnitToMm to mil10ToMm

lib/convert-easyeda-json-to-tscircuit-soup-json.ts

@@ -28,6 +28,7 @@ import { findBoundsAndCenter, transformPCBElements } from "@tscircuit/soup-util"
 import { compose, scale, translate } from "transformation-matrix"
 import { computeCenterOffset } from "./compute-center-offset"
 import { mm } from "@tscircuit/mm"
+import { mil10ToMm } from "./utils/easyeda-unit-to-mm"
 
 const mil2mm = (mil: number | string) => {
   if (typeof mil === "number") return mm(`${mil}mil`)
@@ -58,7 +59,7 @@ const handleSilkscreenPath = (
       x: milx10(point.x),
       y: milx10(point.y),
     })),
-    stroke_width: track.width,
+    stroke_width: mil10ToMm(track.width),
   })
 }
 
@@ -82,7 +83,7 @@ const handleSilkscreenArc = (arc: z.infer<typeof ArcSchema>, index: number) => {
       x: milx10(p.x),
       y: milx10(p.y),
     })),
-    stroke_width: mm(arc.width),
+    stroke_width: mil10ToMm(arc.width),
   } as Soup.PcbSilkscreenPathInput)
 }
 

lib/schemas/single-letter-shape-schema.ts

@@ -1,4 +1,6 @@
 import { z } from "zod"
+import { mm } from "@tscircuit/mm"
+import { mil10ToMm } from "lib/utils/easyeda-unit-to-mm"
 
 /**
  I'll break down the elements in the `dataStr.head.shape` array and explain what they represent. This array contains instructions for drawing the schematic symbol of the component.
@@ -272,7 +274,7 @@ const parsePath = (str: string): z.infer<typeof PathShapeOutputSchema> => {
     type: "PATH",
     pathData,
     fillColor,
-    strokeWidth: Number(strokeWidth),
+    strokeWidth: mil10ToMm(Number(strokeWidth)),
     strokeColor,
     id,
   }

lib/utils/easyeda-unit-to-mm.ts

@@ -0,0 +1,9 @@
+/**
+ * EasyEDA takes 10 mil as a basic factor, when a stroke width is 1, we can take it as 1*10mil = 10mil, is 2, we can take it as 2*10mil = 20mil,
+ * Ref: https://docs.easyeda.com/en/DocumentFormat/3-EasyEDA-PCB-File-Format/#unit
+ *
+ * 1 mil = 0.001 inch
+ * 1 inch = 25.4 mm
+ * 1 mil = 25.4/1000 = 0.0254 mm
+ */
+export const mil10ToMm = (value: number): number => value * 10 * 0.0254