bitmap2gcode experiment

bitmap2gcode.js

var context2d = require('context2d');
var Image = require('htmlimage');
var args = require('yargs')(process.argv.slice(2)).argv;
var img = new Image();
console.log(args);
if (!args.url) {
  console.log('usage: node bitmap2gcode.js --url="http|file://path/to/thingy.png --dpi=90 --depth=5 --depthPerPass')
}


img.onload = function() {
  var imageData = img.imageData;

  var max = 0;

  var size = imageData.width*imageData.height;
  var f32a = new Float32Array(size);
  var source = imageData.data;

  var pixelDepthMax = (3*255);

  for (var i = 0; i<size; i++) {
    // collect a ratio of depth so we can apply it to the incoming depth in mm
    var r = source[i*4] * (args.rmult || 1)
    var g = source[i*4 + 1] * (args.gmult || 1)
    var b = source[i*4 + 2] * (args.bmult || 1)
    f32a[i] = 1 - (Math.min(r+g+b, pixelDepthMax) / pixelDepthMax);

    if (max < f32a[i]) {
      max = f32a[i];
    }
  }
  var w = imageData.width;
  var h = imageData.height;

  var move = function(x, y, z) {
    var obj = {x:x, y:y, z:z};

    console.log('G1' + Object.keys(obj).filter(function(k) {
      if (typeof obj[k] !== 'undefined' && obj[k] !== null) {
        return true;
      }
      return false;
    }).map(function(k) {
      return k + Number(obj[k]).toFixed(3);
    }).join(''));
  }

  args.dpm = args.dpm || 1;

  move(null, null, .5);
  for (var waterline = -args.depthPerPass; waterline>=args.depth; waterline-=args.depthPerPass) {

    for (var x=0; x<w; x+=args.dpm) {
      move(x / args.dpm);
      move(null, null, 0);

      for (var y = 0; y<h; y++) {
        var v = Math.max(waterline, f32a[y*h + x] * args.depth);
        if (typeof args.smooth !== 'undefined') {
          move(null, y / args.dpm, v);
        } else {
          move(null, null, v);
          move(null, y / args.dpm);
        }
      }

      move(null, null, .5)
      x+=args.dpm;
      move(x / args.dpm);

      for (var y = h; y>=0; y--) {
        var v = Math.max(waterline, f32a[y*h + x] * args.depth);
        if (typeof args.smooth !== 'undefined') {
          move(null, y / args.dpm, v);
        } else {
          move(null, null, v);
          move(null, y / args.dpm);
        }
      }

      move(null, null, .5);
    }

    move(null, null, 5);
  }
}


if (args.url.indexOf('://') < 0) {
  args.url = 'file://' + args.url;
}

img.src = args.url;

package.json

{
  "dependencies": {
    "htmlimage": "^1.1.0",
    "ndarray": "^1.0.15",
    "yargs": "^1.2.6"
  }
}

result-in-pine.jpg

ssgithub.png

usage.txt

node bitmap2gcode.js --smooth --url=file:///Users/tmpvar/work/js/bitmap2gcode/ssgithub.png --depth=-5 --depthPerPass=1 --dpm=10 --rmult=2 --gmult=.1