kicad/fab.pretty/fab_IC_SOIC14.kicad_mod

+(module fab_IC_SOIC14 (layer F.Cu) (tedit 5F8872F2)
+  (attr smd)
+  (fp_text reference IC_SOIC14 (at 0 -5.5) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value REF** (at 0 5.5) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -1 -4.5) (end -2 -3.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start -2 4.5) (end -2 -4.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start 2 4.5) (end -2 4.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start 2 -4.5) (end 2 4.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start -2 -4.5) (end 2 -4.5) (layer F.SilkS) (width 0.12))
+  (pad 1 smd roundrect (at -3.15214 -3.81 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask) (roundrect_rratio 0.25))
+  (pad 2 smd rect (at -3.15214 -2.54 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 3 smd rect (at -3.15214 -1.27 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 4 smd rect (at -3.15214 0 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 5 smd rect (at -3.15214 1.27 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 6 smd rect (at -3.15214 2.54 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 7 smd rect (at -3.15214 3.81 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 8 smd rect (at 3.15214 3.81 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 9 smd rect (at 3.15214 2.54 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 10 smd rect (at 3.15214 1.27 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 11 smd rect (at 3.15214 0 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 12 smd rect (at 3.15214 -1.27 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 13 smd rect (at 3.15214 -2.54 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 14 smd rect (at 3.15214 -3.81 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+)

kicad/fab.pretty/fab_IC_SOIC20.kicad_mod

+(module fab_IC_SOIC20 (layer F.Cu) (tedit 5F8875D0)
+  (attr smd)
+  (fp_text reference IC_SOIC20 (at 0 -7.5) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value REF** (at 0 0) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -3.75 -6.5) (end 3.75 -6.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start 3.75 6.5) (end -3.75 6.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start -3.75 6.5) (end -3.75 -6.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start -2.5 -6.5) (end -3.75 -5.25) (layer F.SilkS) (width 0.12))
+  (fp_line (start 3.75 -6.5) (end 3.75 6.5) (layer F.SilkS) (width 0.12))
+  (pad 1 smd roundrect (at -4.953 -5.715) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask) (roundrect_rratio 0.25))
+  (pad 2 smd rect (at -4.953 -4.445) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 3 smd rect (at -4.953 -3.175) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 4 smd rect (at -4.953 -1.905) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 5 smd rect (at -4.953 -0.635) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 6 smd rect (at -4.953 0.635) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 7 smd rect (at -4.953 1.905) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 8 smd rect (at -4.953 3.175) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 9 smd rect (at -4.953 4.445) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 10 smd rect (at -4.953 5.715) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 11 smd rect (at 4.953 5.715) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 12 smd rect (at 4.953 4.445) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 13 smd rect (at 4.953 3.175) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 14 smd rect (at 4.953 1.905) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 15 smd rect (at 4.953 0.635) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 16 smd rect (at 4.953 -0.635) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 17 smd rect (at 4.953 -1.905) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 18 smd rect (at 4.953 -3.175) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 19 smd rect (at 4.953 -4.445) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+  (pad 20 smd rect (at 4.953 -5.715) (size 2.2 0.5) (layers F.Cu F.Paste F.Mask))
+)

kicad/fab.pretty/fab_IC_SOIC8.kicad_mod

+(module fab_IC_SOIC8 (layer F.Cu) (tedit 5F8871ED)
+  (attr smd)
+  (fp_text reference IC_SOIC8 (at 0 -3.4925) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value REF** (at 0 3.429) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -2 -2.5) (end 2 -2.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start 2 -2.5) (end 2 2.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start 2 2.5) (end -2 2.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start -2 2.5) (end -2 -2.5) (layer F.SilkS) (width 0.12))
+  (fp_line (start -1 -2.5) (end -2 -1.5) (layer F.SilkS) (width 0.12))
+  (pad 1 smd roundrect (at -3.15214 -1.905 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask) (roundrect_rratio 0.25))
+  (pad 2 smd rect (at -3.15214 -0.64262 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 3 smd rect (at -3.15214 0.62484 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 4 smd rect (at -3.15214 1.89484 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 5 smd rect (at 3.15214 1.905 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 6 smd rect (at 3.15214 0.635 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 7 smd rect (at 3.15214 -0.635 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+  (pad 8 smd rect (at 3.15214 -1.905 270) (size 0.5 2.2) (layers F.Cu F.Paste F.Mask))
+)

kicad/fab.pretty/fab_LED_1206.kicad_mod

+(module fab_LED_1206 (layer F.Cu) (tedit 5F887772)
+  (attr smd)
+  (fp_text reference LED_1206 (at 0 -1.905) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value REF** (at 0 1.905) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -2.032 -1.016) (end 2.032 -1.016) (layer F.SilkS) (width 0.127))
+  (fp_line (start 2.032 -1.016) (end 2.032 1.016) (layer B.SilkS) (width 0.127))
+  (fp_line (start 2.032 1.016) (end -2.032 1.016) (layer F.SilkS) (width 0.127))
+  (fp_line (start -2.032 1.016) (end -2.032 -1.016) (layer B.SilkS) (width 0.127))
+  (fp_line (start -2.6 -1) (end -2.6 1) (layer F.SilkS) (width 0.12))
+  (pad 1 smd rect (at -1.778 0) (size 1.5 2) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at 1.778 0) (size 1.5 2) (layers F.Cu F.Paste F.Mask))
+)

kicad/fab.pretty/fab_LED_RGB.kicad_mod

+(module fab_LED_RGB (layer F.Cu) (tedit 5F887A11)
+  (fp_text reference REF** (at 0 2.2) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value LED_RGB (at 0 -2.2) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -1.7 -1.4) (end 1.7 -1.4) (layer F.SilkS) (width 0.12))
+  (fp_line (start 1.7 -1.4) (end 1.7 1.4) (layer F.SilkS) (width 0.12))
+  (fp_line (start 1.7 1.4) (end -1.7 1.4) (layer F.SilkS) (width 0.12))
+  (fp_line (start -1.7 1.4) (end -1.7 -1.4) (layer F.SilkS) (width 0.12))
+  (fp_circle (center 0 0) (end 0 1.2) (layer F.SilkS) (width 0.12))
+  (fp_line (start -1 -1.4) (end -1.7 -0.7) (layer F.SilkS) (width 0.12))
+  (pad 1 smd rect (at -2.2 -0.8) (size 2 0.7) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at -2.2 0.8) (size 2 0.7) (layers F.Cu F.Paste F.Mask))
+  (pad 3 smd rect (at 2.2 0.8) (size 2 0.7) (layers F.Cu F.Paste F.Mask))
+  (pad 4 smd rect (at 2.2 -0.8) (size 2 0.7) (layers F.Cu F.Paste F.Mask))
+)

kicad/fab.pretty/fab_R_1206.kicad_mod

+(module fab_R_1206 (layer F.Cu) (tedit 5F886E48)
+  (attr smd)
+  (fp_text reference R_1206 (at 0 -1.905) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value REF** (at 0 1.905) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -2.032 1.016) (end -2.032 -1.016) (layer B.SilkS) (width 0.127))
+  (fp_line (start 2.032 1.016) (end -2.032 1.016) (layer F.SilkS) (width 0.127))
+  (fp_line (start 2.032 -1.016) (end 2.032 1.016) (layer B.SilkS) (width 0.127))
+  (fp_line (start -2.032 -1.016) (end 2.032 -1.016) (layer F.SilkS) (width 0.127))
+  (pad 1 smd rect (at -1.778 0) (size 1.5 2) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at 1.778 0) (size 1.5 2) (layers F.Cu F.Paste F.Mask))
+)

kicad/fab.pretty/fab_SMD_SOT223.kicad_mod

+(module fab_SMD_SOT223 (layer F.Cu) (tedit 5F88793B)
+  (fp_text reference REF** (at 0 0) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value SMD_SOT223 (at 0 -6) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -3.2 1.8) (end -3.2 -1.8) (layer F.SilkS) (width 0.12))
+  (fp_line (start 3.2 1.8) (end -3.2 1.8) (layer F.SilkS) (width 0.12))
+  (fp_line (start 3.2 -1.8) (end 3.2 1.8) (layer F.SilkS) (width 0.12))
+  (fp_line (start -3.2 -1.8) (end 3.2 -1.8) (layer F.SilkS) (width 0.12))
+  (pad 1 smd rect (at -2.25 3.75) (size 1 3) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at 0 3.75) (size 1 3) (layers F.Cu F.Paste F.Mask))
+  (pad 3 smd rect (at 2.25 3.75) (size 1 3) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at 0 -3.75) (size 3.5 3) (layers F.Cu F.Paste F.Mask))
+)

kicad/fab.pretty/fab_SMD_SOT23.kicad_mod

+(module fab_SMD_SOT23 (layer F.Cu) (tedit 5F88736F)
+  (attr smd)
+  (fp_text reference SMD_SOT23 (at 0 -3) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value REF** (at 0 3) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start 0.8636 -0.6604) (end 1.4224 -0.6604) (layer B.SilkS) (width 0.1524))
+  (fp_line (start 1.4224 -0.6604) (end 1.4224 0.1524) (layer B.SilkS) (width 0.1524))
+  (fp_line (start -1.4224 -0.6604) (end -0.8636 -0.6604) (layer B.SilkS) (width 0.1524))
+  (fp_line (start -1.4224 0.1524) (end -1.4224 -0.6604) (layer B.SilkS) (width 0.1524))
+  (fp_line (start -1.4224 -0.6604) (end 1.4224 -0.6604) (layer F.SilkS) (width 0.1524))
+  (fp_line (start -1.4224 0.6604) (end -1.4224 -0.6604) (layer F.SilkS) (width 0.1524))
+  (fp_line (start 1.4224 0.6604) (end -1.4224 0.6604) (layer F.SilkS) (width 0.1524))
+  (fp_line (start 1.4224 -0.6604) (end 1.4224 0.6604) (layer F.SilkS) (width 0.1524))
+  (pad 1 smd rect (at -0.94996 1.5) (size 0.5 1.6) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at 0.94996 1.5) (size 0.5 1.6) (layers F.Cu F.Paste F.Mask))
+  (pad 3 smd rect (at 0 -1.5) (size 0.5 1.6) (layers F.Cu F.Paste F.Mask))
+)

kicad/fab.pretty/fab_SW_pushbutton.kicad_mod

+(module fab_SW_pushbutton (layer F.Cu) (tedit 5F88811F)
+  (fp_text reference REF** (at 0 2.2) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value SW_pushbutton (at 0 -4.2) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_circle (center 0 0) (end 0 1.2) (layer F.SilkS) (width 0.12))
+  (fp_line (start -3.2 3) (end -3.2 -3) (layer F.SilkS) (width 0.12))
+  (fp_line (start 3.2 3) (end -3.2 3) (layer F.SilkS) (width 0.12))
+  (fp_line (start 3.2 -3) (end 3.2 3) (layer F.SilkS) (width 0.12))
+  (fp_line (start -3.2 -3) (end 3.2 -3) (layer F.SilkS) (width 0.12))
+  (pad 1 smd rect (at -3.6 -2) (size 4 0.8) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at -3.6 2) (size 4 0.8) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at 3.6 2) (size 4 0.8) (layers F.Cu F.Paste F.Mask))
+  (pad 1 smd rect (at 3.6 -2) (size 4 0.8) (layers F.Cu F.Paste F.Mask))
+)

kokopelli/README.md

+<a href='https://www.mattkeeter.com/projects/kokopelli/'>Kokopelli</a> is an old (but great) project from <a href='https://www.mattkeeter.com/'>Matt Keeter</a>.  Its a full-blown CAD program, but it can be used for designing PCBs.  The programmatic interface makes it easy to set up relationships between components, traces, etc. and you can toolpath for the circuit mill right in kokopelli.
+
+To use it, clone it from github: https://github.com/mkeeter/kokopelli and install with the makefile.
+
+I've added a couple small utilities to Matt's original PCB design library.  If you'd like to use them, you can replace the existing koko/lib/pcb.py with <a href='pcb.py'>pcb.py</a> and reinstall.
+
+A fun example using several of the included features is a stepper driver board I designed:
+
+<img src='servo-stepper-v1-layout.png' width=500px>
+

node/frep.js

+#!/usr/bin/env node
+//
+// frep.js
+//    functional representation solver
+//
+// usage:
+//    pcb.py | frep.js [dpi [workers [filename]]]
+// with:
+//    https://gitlab.cba.mit.edu/pub/libraries/blob/master/python/pcb.py
+//
+// Neil Gershenfeld 12/7/19
+//
+// This work may be reproduced, modified, distributed,
+// performed, and displayed for any purpose, but must
+// acknowledge this project. Copyright is retained and
+// must be preserved. The work is provided as is; no
+// warranty is provided, and users accept all liability.
+//
+const fs = require("fs")
+const os = require("os")
+const {Worker} = require('worker_threads')
+//
+// get frep from stdin
+//
+var input = ''
+process.stdin.on('readable',() => {
+   var chunk = process.stdin.read()
+   if (chunk != null)
+      input += chunk
+   })
+process.stdin.on('end',() => {
+   render(JSON.parse(input))
+   })
+//
+// render function
+//
+function render(frep) {
+   //
+   // check arguments
+   //
+   if (frep.zmin != frep.zmax) {
+      console.log('> 2D not (yet) supported')
+      process.exit()
+      }
+   if (frep.type != 'RGB') {
+      console.log('types other than RGB not (yet) supported')
+      process.exit()
+      }
+   if (process.argv.length == 2) {
+      var dpi = 100
+      workers = os.cpus().length
+      var filename = 'out.png'
+      console.log('output to out.png at 100 DPI')
+      }
+   else if (process.argv.length == 3) {
+      var dpi = parseInt(process.argv[2])
+      workers = os.cpus().length
+      var filename = 'out.png'
+      console.log('output to out.png at '+dpi+' DPI')
+      }
+   else if (process.argv.length == 4) {
+      var dpi = parseInt(process.argv[2])
+      var workers = parseInt(process.argv[3])
+      var filename = 'out.png'
+      console.log('output to '+filename+' at '+dpi+' DPI')
+      }
+   else if (process.argv.length == 5) {
+      var dpi = parseInt(process.argv[2])
+      var workers = parseInt(process.argv[3])
+      var filename = process.argv[4]
+      console.log('output to '+filename+' at '+dpi+' DPI')
+      }
+   //
+   // set variables
+   //
+   var delta = (25.4/dpi)/frep.mm_per_unit
+   var width = Math.floor(1+(frep.xmax-frep.xmin)/delta)
+   var height = Math.floor(1+(frep.ymax-frep.ymin)/delta)
+   var buf = new SharedArrayBuffer(width*height*4)
+   var data = new Uint8Array(buf)
+   //
+   // worker thread
+   //
+   var thread =
+      `
+      const Worker = require('worker_threads')
+      Worker.parentPort.on('message',(msg) => {
+         var fn = Function('X','Y','Z','return('+msg.fn+')')
+         var data = new Uint8Array(msg.buf)
+         var width = msg.width
+         var height = msg.height
+         var xmin = msg.xmin
+         var ymin = msg.ymin
+         var delta = msg.delta
+         var z = msg.z
+         var index = msg.index
+         var workers = msg.workers
+         var start = Math.round(width*index/workers)
+         var stop = Math.round(width*(index+1)/workers)-1
+         console.log(index+': '+start+'-'+stop)
+         var x,y,f
+         for (let row = 0; row < height; ++row) {
+            y = ymin+(height-1-row)*delta
+            for (let col = start; col <= stop; ++col) {
+               x = xmin+col*delta
+               f = fn(x,y,z)
+               data[row*width*4+col*4+0] = (f & 255)
+               data[row*width*4+col*4+1] = ((f >> 8) & 255)
+               data[row*width*4+col*4+2] = ((f >> 16) & 255)
+               data[row*width*4+col*4+3] = 255
+               }
+            }
+         Worker.parentPort.postMessage(index)
+      })
+      `
+   //
+   // start workers
+   //
+   console.log('start '+workers+' workers')
+   var count = 0
+   for (let i = 0; i < workers; ++i) {
+      var worker = new Worker(thread,{eval:true})
+      //
+      // worker message handler
+      //
+      worker.on('message',(msg) => {
+         console.log('done: '+msg)
+         count += 1
+         //
+         // check if done
+         //
+         if (count == workers) {
+            var dpm = 1000*dpi/25.4
+            fs.writeFileSync(filename,PNG(data,width,height,dpm))
+            console.log('wrote '+width+'x'+height)
+            process.exit()
+            }
+         })
+      worker.postMessage({index:i,workers:workers,
+         delta:delta,width:width,height:height,xmin:frep.xmin,ymin:frep.ymin,
+         z:frep.layers[0], // need to handle multiple layers
+         buf:buf,fn:frep.function})
+      }
+   }
+//
+// PNG function
+//
+function PNG(array,width,height,dpm) {
+   //
+   // PNG buffer
+   //
+   var length =
+   8 // signature
+   + 25 // IHDR
+   + 21 // pHYs
+   + 12 // IDAT length, type, CRC
+   + 2 // zlib header
+   + 4 // zlib checksum
+   + 5*(Math.ceil((height+width*height*4)/0xffff)) // block headers
+   + width*height*4 // pixels
+   + height // scanline filters
+   + 12 // IEND
+   var buf = new ArrayBuffer(length)
+   var arr = new Uint8Array(buf)
+   var view = new DataView(buf)
+   //
+   // checksum functions
+   //
+   var CRC32table = []
+   for (let n = 0; n < 256; ++n) {
+      var crc = new Uint32Array(1)
+      crc[0] = n
+      for (let i = 0; i < 8; ++i) {
+         if (crc[0] & 1)
+            crc[0] = 0xedb88320 ^ (crc[0] >>> 1)
+         else
+            crc[0] = crc[0] >>> 1
+         }
+      CRC32table[n] = crc[0]
+      }
+   function CRC32(buf,start,stop) {
+      var crc = new Uint32Array(1)
+      crc[0] = 0xffffffff
+      for (let i = start; i < stop; ++i)
+         crc[0] = CRC32table[(crc[0] ^ buf[i]) & 0xff] ^ (crc[0] >>> 8);
+      crc[0] = crc[0] ^ 0xffffffff
+      return(crc[0])
+      }
+   var CRCAdler32 = new Uint32Array([1,0,0])
+   function Adler32(byte,crc) {
+      crc[0] = (crc[0]+byte)%65521
+      crc[1] = (crc[1]+crc[0])%65521
+      crc[2] = (crc[1]<<16)+crc[0]
+      return(crc)
+      }
+   //
+   var ptr = 0
+   var LengthPtr,DataStart,CRCstart,AdlerStart
+   //
+   // signature
+   //
+   arr.set([137,80,78,71,13,10,26,10],ptr)
+   ptr += 8
+   //
+   // IHDR length
+   //
+   view.setUint32(ptr,13,false)
+   ptr += 4
+   //
+   // IHDR type
+   //
+   CRCstart = ptr
+   arr.set([73,72,68,82],ptr)
+   ptr += 4
+   //
+   // IHDR data
+   //
+   view.setUint32(ptr,width,false) // width
+   ptr += 4
+   view.setUint32(ptr,height,false) // height
+   ptr += 4
+   arr.set([8,6,0,0,0],ptr)// 8 bit depth, RGBA, deflate compression, adaptive filter
+   ptr += 5
+   //
+   // IHDR CRC
+   //
+   view.setUint32(ptr,CRC32(arr,CRCstart,ptr),false)
+   ptr += 4
+   //
+   // pHYs length
+   //
+   view.setUint32(ptr,9,false)
+   ptr += 4
+   //
+   // pHYs type
+   //
+   CRCstart = ptr
+   arr.set([112,72,89,115],ptr)
+   ptr += 4
+   //
+   // pHYs data
+   //
+   view.setUint32(ptr,dpm) // x pixels per unit
+   ptr += 4
+   view.setUint32(ptr,dpm) // y pixels per unit
+   ptr += 4
+   view.setUint8(ptr,1) // meter unit
+   ptr += 1
+   //
+   // pHYs CRC
+   //
+   view.setUint32(ptr,CRC32(arr,CRCstart,ptr),false)
+   ptr += 4
+   //
+   // IDAT length location
+   //
+   LengthPtr = ptr
+   ptr += 4
+   //
+   // IDAT type
+   //
+   CRCstart = ptr
+   arr.set([73,68,65,84],ptr)
+   ptr += 4
+   //
+   // IDAT data
+   //
+   // IDAT data zlib header
+   //
+   DataStart = ptr
+   arr.set([0x78,0x01],ptr)
+   ptr += 2
+   //
+   // IDAT data deflate blocks
+   //
+   var BlockSize = 0xffff
+   var BlockByte = 0
+   var DataSize = height+width*height*4
+   var DataByte = 0
+   function BlockData(byte) {
+      if (BlockByte == 0) { // start of new block
+         if (DataByte+BlockSize < DataSize) {
+            var BlockLength = BlockSize
+            view.setUint8(ptr,0) // block header, not last block, no compression
+            ptr += 1
+            }
+         else if (DataByte+BlockSize == DataSize) {
+            var BlockLength = BlockSize
+            view.setUint8(ptr,1) // block header, last block, no compression
+            ptr += 1
+            }
+         else {
+            var BlockLength = DataSize-DataByte
+            view.setUint8(ptr,1) // block header, last block, no compression
+            ptr += 1
+            }
+         view.setUint16(ptr,BlockLength,true) // block length, little-endian
+         ptr += 2
+         view.setUint16(ptr,0xffff ^ view.getUint16(ptr-2,true),true) // block length one's complement
+         ptr += 2
+         }
+      CRCAdler32 = Adler32(byte,CRCAdler32) // update zlib checksum
+      view.setUint8(ptr,byte) // save byte to PNG buffer
+      ptr += 1 // move PNG pointer
+      DataByte += 1 // move data counter
+      BlockByte += 1 // move block counter
+      if (BlockByte == BlockSize) // end of deflate block
+         BlockByte = 0 // next byte starts new block
+      }
+   //
+   // IDAT data scan lines
+   //
+   for (let row = 0; row < height; ++row) {
+      BlockData(0) // scan line, no filter
+      for (let col = 0; col < width; ++col) {
+         BlockData(array[row*width*4+col*4+0]) // R
+         BlockData(array[row*width*4+col*4+1]) // G
+         BlockData(array[row*width*4+col*4+2]) // B
+         BlockData(array[row*width*4+col*4+3]) // A
+         }
+      }
+   //
+   // IDAT data zlib checksum
+   //
+   view.setUint32(ptr,CRCAdler32[2],false) // zlib Adler32
+   ptr += 4
+   //
+   // set IDAT length
+   //
+   view.setUint32(LengthPtr,ptr-DataStart,false)
+   //
+   // IDAT CRC
+   //
+   view.setUint32(ptr,CRC32(arr,CRCstart,ptr),false)
+   ptr += 4
+   //
+   // IEND length
+   //
+   view.setUint32(ptr,0,false)
+   ptr += 4
+   //
+   // IEND type
+   //
+   CRCstart = ptr
+   arr.set([73,69,78,68],ptr)
+   ptr += 4
+   //
+   // no IEND data
+   //
+   // IHDR CRC
+   //
+   view.setUint32(ptr,CRC32(arr,CRCstart,ptr),false)
+   ptr += 4
+   //
+   // return
+   //
+   return arr
+   }

python/Gerber/bottom.png-fill.gbr

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python/Gerber/holes.png-drill.xln

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+M30

python/Gerber/interior.png-outline.gbr

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