module escpos
1. function escpos.adapter ()
2. function escpos.console (handler)
3. function escpos.image (pixels)
4. function escpos.network (address, port)
5. function escpos.printer (adapter)
6. function escpos.serial (port, options)
7. object escpos.adapter.prototype
8. object escpos.console.prototype
9. object escpos.image.prototype
10. object escpos.network.prototype
11. object escpos.printer.prototype
12. object escpos.serial.prototype
module escpos.adapter
module escpos.adapter.prototype
module escpos.console
1. function escpos.console (handler)
module escpos.console.prototype
1. function escpos.console.prototype.open (callback)
2. function escpos.console.prototype.write (data)
module escpos.image
1. function escpos.image (pixels)
2. function escpos.image.load (url, type, callback)
module escpos.image.prototype
1. function escpos.image.prototype.toBitmap (density)
2. function escpos.image.prototype.toRaster ()
module escpos.network
1. function escpos.network (address, port)
2. function escpos.network.super_ ()
module escpos.network.prototype
module escpos.printer
1. function escpos.printer (adapter)
2. function escpos.printer.super_ ()
module escpos.printer.prototype
module escpos.serial
1. function escpos.serial (port, options)
2. function escpos.serial.super_ ()
module escpos.serial.prototype

module escpos

function escpos.adapter ()

description and source-code

function Adapter(){
  EventEmitter.call(this);
  return this;
}

example usage
```
n/a
```

function escpos.console (handler)

description and source-code

function Console(handler){
  this.handler = handler || stdout;
}

example usage
```
n/a
```

function escpos.image (pixels)

description and source-code

function Image(pixels){
  if(!(this instanceof Image))
    return new Image(pixels);
  this.pixels = pixels;

  this.data = [];
  function rgb(pixel) {
    return {
      r: pixel[0],
      g: pixel[1],
      b: pixel[2],
      a: pixel[3]
    };
  };

  var self = this;
  for(var i=0;i<this.pixels.data.length;i+=this.size.colors){
    this.data.push(rgb(new Array(this.size.colors).fill(0).map(function(_, b){
      return self.pixels.data[ i + b ];
    })));
  };

  this.data = this.data.map(function(pixel){
    if(pixel.a == 0) return 0;
    return pixel.r !== 0xFF || pixel.g !== 0xFF || pixel.b !== 0xFF ? 1 : 0;
  });

}

example usage
```
n/a
```

function escpos.network (address, port)

description and source-code

function Network(address, port){
  EventEmitter.call(this);
  this.address = address;
  this.port = port || 9100;
  this.device = new net.Socket();
  return this;
}

example usage
```
n/a
```

function escpos.printer (adapter)

description and source-code

function Printer(adapter){
  if (!(this instanceof Printer)) {
    return new Printer(adapter);
  }
  var self = this;
  EventEmitter.call(this);
  this.adapter = adapter;
  this.buffer = new Buffer();
}

example usage
```
n/a
```

function escpos.serial (port, options)

description and source-code

function Serial(port, options){
  var self = this;
  options = options || {
    baudrate: 9600,
    autoOpen: false
  };
  this.device = new SerialPort(port, options);
  this.device.on('close', function() {
    self.emit('disconnect', self.device);
    self.device = null;
  });
  EventEmitter.call(this);
  return this;
}

example usage
```
n/a
```

module escpos.adapter

function escpos.adapter ()

description and source-code

function Adapter(){
  EventEmitter.call(this);
  return this;
}

example usage
```
n/a
```

function escpos.adapter.extends (ctor)

description and source-code

extends = function (ctor){
  // console.log(ctor);
  util.inherits(ctor, Adapter);
  return ctor;
}

example usage
```
n/a
```

function escpos.adapter.super_ ()

description and source-code

function EventEmitter() {
  EventEmitter.init.call(this);
}

example usage
```
n/a
```

module escpos.adapter.prototype

function escpos.adapter.prototype.close ()

description and source-code

close = function () {
  throw new Error('NotImplementedException');
  return this;
}

example usage

...
  .style('bu')
  .size(1, 1)
  .text('The quick brown fox jumps over the lazy dog')
  .text('敏捷的棕色狐狸跳过懒狗')
  .barcode('12345678', 'EAN8')
  .qrimage('https://github.com/song940/node-escpos', function(err){
    this.cut();
    this.close();
  });

});


````
----
...

function escpos.adapter.prototype.open ()

description and source-code

open = function () {
  throw new Error('NotImplementedException');
  return this;
}

example usage

...
// Select the adapter based on your printer type
const device  = new escpos.USB();
// const device  = new escpos.Network('localhost');
// const device  = new escpos.Serial('/dev/usb/lp0');

const printer = new escpos.Printer(device);

device.open(function(){

printer
.font('a')
.align('ct')
.style('bu')
.size(1, 1)
.text('The quick brown fox jumps over the lazy dog')
...

function escpos.adapter.prototype.write ()

description and source-code

write = function () {
  throw new Error('NotImplementedException');
  return this;
}

example usage

...

/**
* Fix bottom margin
* @param  {[String]} size
* @return printer instance
*/
Printer.prototype.marginBottom = function(size){
 this.buffer.write(_.MARGINS.BOTTOM);
 this.buffer.writeUInt8(size);
 return this;
};

/**
* Fix left margin
* @param  {[String]} size
...

module escpos.console

function escpos.console (handler)

description and source-code

function Console(handler){
  this.handler = handler || stdout;
}

example usage
```
n/a
```

module escpos.console.prototype

function escpos.console.prototype.open (callback)

description and source-code

open = function (callback){
  callback && callback();
}

example usage

...
// Select the adapter based on your printer type
const device  = new escpos.USB();
// const device  = new escpos.Network('localhost');
// const device  = new escpos.Serial('/dev/usb/lp0');

const printer = new escpos.Printer(device);

device.open(function(){

printer
.font('a')
.align('ct')
.style('bu')
.size(1, 1)
.text('The quick brown fox jumps over the lazy dog')
...

function escpos.console.prototype.write (data)

description and source-code

write = function (data){
  this.handler && this.handler(data);
}

example usage

...

/**
* Fix bottom margin
* @param  {[String]} size
* @return printer instance
*/
Printer.prototype.marginBottom = function(size){
 this.buffer.write(_.MARGINS.BOTTOM);
 this.buffer.writeUInt8(size);
 return this;
};

/**
* Fix left margin
* @param  {[String]} size
...

module escpos.image

function escpos.image (pixels)

description and source-code

function Image(pixels){
  if(!(this instanceof Image))
    return new Image(pixels);
  this.pixels = pixels;

  this.data = [];
  function rgb(pixel) {
    return {
      r: pixel[0],
      g: pixel[1],
      b: pixel[2],
      a: pixel[3]
    };
  };

  var self = this;
  for(var i=0;i<this.pixels.data.length;i+=this.size.colors){
    this.data.push(rgb(new Array(this.size.colors).fill(0).map(function(_, b){
      return self.pixels.data[ i + b ];
    })));
  };

  this.data = this.data.map(function(pixel){
    if(pixel.a == 0) return 0;
    return pixel.r !== 0xFF || pixel.g !== 0xFF || pixel.b !== 0xFF ? 1 : 0;
  });

}

example usage
```
n/a
```

function escpos.image.load (url, type, callback)

description and source-code

load = function (url, type, callback){
  if(typeof type == 'function'){
    callback = type;
    type = null;
  }
  getPixels(url, type, function(err, pixels){
    if(err) return callback(err);
    callback(new Image(pixels));
  });
}

example usage
```
n/a
```

module escpos.image.prototype

function escpos.image.prototype.toBitmap (density)

description and source-code

toBitmap = function (density) {
  density = density || 24;

  var ld, result = [];
  var x, y, b, l, i;
  var c = density / 8;

  // n blocks of lines
  var n = Math.ceil(this.size.height / density);

  for (y = 0; y < n; y++) {
    // line data
    ld = result[y] = [];

    for (x = 0; x < this.size.width; x++) {

      for (b = 0; b < density; b++) {
        i = x * c + (b >> 3);

        if (ld[i] === undefined) {
          ld[i] = 0;
        }

        l = y * density + b;
        if (l < this.size.height) {
          if (this.data[l * this.size.width + x]) {
            ld[i] += (0x80 >> (b & 0x7));
          }
        }
      }
    }
  }

  return {
    data: result,
    density: density
  };
}

example usage

...
 */
Printer.prototype.image = function(image, density){
if(!(image instanceof Image))
  throw new TypeError('Only escpos.Image supported');
density = density || 'd24';
var n = !!~[ 'd8', 's8' ].indexOf(density) ? 1 : 3;
var header = _.BITMAP_FORMAT['BITMAP_' + density.toUpperCase()];
var bitmap = image.toBitmap(n * 8);
var self = this;
this.lineSpace(0); // set line spacing to 0
bitmap.data.forEach(function (line) {
  self.buffer.write(header);
  self.buffer.writeUInt16LE(line.length / n);
  self.buffer.write(line);
  self.buffer.write(_.EOL);
...

function escpos.image.prototype.toRaster ()

description and source-code

toRaster = function () {
  var result = [];
  var width  = this.size.width;
  var height = this.size.height;
  var data   = this.data;

  // n blocks of lines
  var n = Math.ceil(width / 8);
  var x, y, b, c, i;

  for (y = 0; y < height; y++) {

    for (x = 0; x < n; x++) {

      for (b = 0; b < 8; b++) {
        i = x * 8 + b;

        if (result[y * n + x] === undefined) {
          result[y * n + x] = 0;
        }

        c = x * 8 + b;
        if (c < width) {
          if (data[y * width + i]) {
            result[y * n + x] += (0x80 >> (b & 0x7));
          }
        }
      }
    }
  }
  return {
    data: result,
    width: n,
    height: height
  };
}

example usage

...
Printer.prototype.raster = function (image, mode) {
  if(!(image instanceof Image))
    throw new TypeError('Only escpos.Image supported');
  mode = mode || 'normal';
  if (mode === 'dhdw' ||
      mode === 'dwh'  ||
      mode === 'dhw') mode = 'dwdh';
  var raster = image.toRaster();
  var header = _.GSV0_FORMAT['GSV0_' + mode.toUpperCase()];
  this.buffer.write(header);
  this.buffer.writeUInt16LE(raster.width);
  this.buffer.writeUInt16LE(raster.height);
  this.buffer.write(raster.data);
  return this;
};
...

module escpos.network

function escpos.network (address, port)

description and source-code

function Network(address, port){
  EventEmitter.call(this);
  this.address = address;
  this.port = port || 9100;
  this.device = new net.Socket();
  return this;
}

example usage
```
n/a
```

function escpos.network.super_ ()

description and source-code

function EventEmitter() {
  EventEmitter.init.call(this);
}

example usage
```
n/a
```

module escpos.network.prototype

function escpos.network.prototype.close (callback)

description and source-code

close = function (callback){
  if(this.device){
    this.device.destroy();
    this.device = null;
  }
  this.emit('disconnect', this.device);
  callback && callback(null, this.device);
  return this;
}

example usage

...
  .style('bu')
  .size(1, 1)
  .text('The quick brown fox jumps over the lazy dog')
  .text('敏捷的棕色狐狸跳过懒狗')
  .barcode('12345678', 'EAN8')
  .qrimage('https://github.com/song940/node-escpos', function(err){
    this.cut();
    this.close();
  });

});


````
----
...

function escpos.network.prototype.open (callback)

description and source-code

open = function (callback){
  var self = this;
  //connect to net printer by socket (port,ip)
  this.device.on("error", (err) => {
    callback && callback(err, self.device);
  }).connect(this.port, this.address, function(err){
    self.emit('connect', self.device);
    callback && callback(err, self.device);
  });
  return this;
}

example usage

...
// Select the adapter based on your printer type
const device  = new escpos.USB();
// const device  = new escpos.Network('localhost');
// const device  = new escpos.Serial('/dev/usb/lp0');

const printer = new escpos.Printer(device);

device.open(function(){

printer
.font('a')
.align('ct')
.style('bu')
.size(1, 1)
.text('The quick brown fox jumps over the lazy dog')
...

function escpos.network.prototype.write (data, callback)

description and source-code

write = function (data, callback){
  this.device.write(data, callback);
  return this;
}

example usage

...

/**
* Fix bottom margin
* @param  {[String]} size
* @return printer instance
*/
Printer.prototype.marginBottom = function(size){
 this.buffer.write(_.MARGINS.BOTTOM);
 this.buffer.writeUInt8(size);
 return this;
};

/**
* Fix left margin
* @param  {[String]} size
...

module escpos.printer

function escpos.printer (adapter)

description and source-code

function Printer(adapter){
  if (!(this instanceof Printer)) {
    return new Printer(adapter);
  }
  var self = this;
  EventEmitter.call(this);
  this.adapter = adapter;
  this.buffer = new Buffer();
}

example usage
```
n/a
```

function escpos.printer.super_ ()

description and source-code

function EventEmitter() {
  EventEmitter.init.call(this);
}

example usage
```
n/a
```

module escpos.printer.prototype

function escpos.printer.prototype.align (align)

description and source-code

align = function (align){
  this.buffer.write(_.TEXT_FORMAT[
    'TXT_ALIGN_' + align.toUpperCase()
  ]);
  return this;
}

example usage

...

const printer = new escpos.Printer(device);

device.open(function(){

printer
.font('a')
.align('ct')
.style('bu')
.size(1, 1)
.text('The quick brown fox jumps over the lazy dog')
.text('敏捷的棕色狐狸跳过懒狗')
.barcode('12345678', 'EAN8')
.qrimage('https://github.com/song940/node-escpos', function(err){
  this.cut();
...

function escpos.printer.prototype.barcode (code, type, width, height, position, font)

description and source-code

barcode = function (code, type, width, height, position, font){
  if(width >= 1 || width <= 255){
    this.buffer.write(_.BARCODE_FORMAT.BARCODE_WIDTH);
  }
  if(height >=2  || height <= 6){
    this.buffer.write(_.BARCODE_FORMAT.BARCODE_HEIGHT);
  }
  this.buffer.write(_.BARCODE_FORMAT[
    'BARCODE_FONT_' + (font || 'A').toUpperCase()
  ]);
  this.buffer.write(_.BARCODE_FORMAT[
    'BARCODE_TXT_' + (position || 'BLW').toUpperCase()
  ]);
  this.buffer.write(_.BARCODE_FORMAT[
    'BARCODE_' + ((type || 'EAN13').replace('-', '_').toUpperCase())
  ]);
  this.buffer.write(code);
  return this;
}

example usage

...
  printer
  .font('a')
  .align('ct')
  .style('bu')
  .size(1, 1)
  .text('The quick brown fox jumps over the lazy dog')
  .text('敏捷的棕色狐狸跳过懒狗')
  .barcode('12345678', 'EAN8')
  .qrimage('https://github.com/song940/node-escpos', function(err){
    this.cut();
    this.close();
  });

});
...

function escpos.printer.prototype.cashdraw (pin)

description and source-code

cashdraw = function (pin){
  this.buffer.write(_.CASH_DRAWER[
    'CD_KICK_' + (pin || 2)
  ]);
  return this.flush();
}

example usage
```
n/a
```

function escpos.printer.prototype.close (callback)

description and source-code

close = function (callback){
  var self = this;
  return this.flush(function(){
    self.adapter.close(callback);
  });
}

example usage

...
  .style('bu')
  .size(1, 1)
  .text('The quick brown fox jumps over the lazy dog')
  .text('敏捷的棕色狐狸跳过懒狗')
  .barcode('12345678', 'EAN8')
  .qrimage('https://github.com/song940/node-escpos', function(err){
    this.cut();
    this.close();
  });

});


````
----
...

function escpos.printer.prototype.control (ctrl)

description and source-code

control = function (ctrl){
  this.buffer.write(_.FEED_CONTROL_SEQUENCES[
    'CTL_' + ctrl.toUpperCase()
  ]);
  return this;
}

example usage
```
n/a
```

function escpos.printer.prototype.cut (part, feed)

description and source-code

cut = function (part, feed){
  this.feed(feed || 3);
  this.buffer.write(_.PAPER[
    part ? 'PAPER_PART_CUT' : 'PAPER_FULL_CUT'
  ]);
  return this.flush();
}

example usage

...
  .align('ct')
  .style('bu')
  .size(1, 1)
  .text('The quick brown fox jumps over the lazy dog')
  .text('敏捷的棕色狐狸跳过懒狗')
  .barcode('12345678', 'EAN8')
  .qrimage('https://github.com/song940/node-escpos', function(err){
    this.cut();
    this.close();
  });

});


````
...

function escpos.printer.prototype.feed (n)

description and source-code

feed = function (n) {
  this.buffer.write(new Array(n || 1).fill(_.EOL).join(''));
  return this.flush();
}

example usage

...

/**
 * [function Cut paper]
 * @param  {[type]} part [description]
 * @return printer instance
 */
Printer.prototype.cut = function(part, feed){
  this.feed(feed || 3);
  this.buffer.write(_.PAPER[
    part ? 'PAPER_PART_CUT' : 'PAPER_FULL_CUT'
  ]);
  return this.flush();
};

/**
...

function escpos.printer.prototype.flush (callback)

description and source-code

flush = function (callback){
  var buf = this.buffer.flush();
  this.adapter.write(buf, callback);
  return this;
}

example usage

...

/**
* Send data to hardware and flush buffer
* @param  {Function} callback
* @return printer instance
*/
Printer.prototype.flush = function(callback){
 var buf = this.buffer.flush();
 this.adapter.write(buf, callback);
 return this;
};
/**
* [function print]
* @param  {[String]}  content  [description]
* @param  {[String]}  encoding [description]
...

function escpos.printer.prototype.font (family)

description and source-code

font = function (family){
  this.buffer.write(_.TEXT_FORMAT[
    'TXT_FONT_' + family.toUpperCase()
  ]);
  return this;
}

example usage

...
// const device  = new escpos.Serial('/dev/usb/lp0');

const printer = new escpos.Printer(device);

device.open(function(){

printer
.font('a')
.align('ct')
.style('bu')
.size(1, 1)
.text('The quick brown fox jumps over the lazy dog')
.text('敏捷的棕色狐狸跳过懒狗')
.barcode('12345678', 'EAN8')
.qrimage('https://github.com/song940/node-escpos', function(err){
...

function escpos.printer.prototype.hardware (hw)

description and source-code

hardware = function (hw){
  this.buffer.write(_.HARDWARE[ 'HW_'+ hw ]);
  return this.flush();
}

example usage
```
n/a
```

function escpos.printer.prototype.image (image, density)

description and source-code

image = function (image, density){
  if(!(image instanceof Image))
    throw new TypeError('Only escpos.Image supported');
  density = density || 'd24';
  var n = !!~[ 'd8', 's8' ].indexOf(density) ? 1 : 3;
  var header = _.BITMAP_FORMAT['BITMAP_' + density.toUpperCase()];
  var bitmap = image.toBitmap(n * 8);
  var self = this;
  this.lineSpace(0); // set line spacing to 0
  bitmap.data.forEach(function (line) {
    self.buffer.write(header);
    self.buffer.writeUInt16LE(line.length / n);
    self.buffer.write(line);
    self.buffer.write(_.EOL);
  });
  // restore line spacing to default
  return this.lineSpace();
}

example usage
```
n/a
```

function escpos.printer.prototype.lineSpace (n)

description and source-code

lineSpace = function (n) {
  if (n === undefined || n === null) {
    this.buffer.write(_.LINE_SPACING.LS_DEFAULT);
  } else {
    this.buffer.write(_.LINE_SPACING.LS_SET);
    this.buffer.writeUInt8(n);
  }
  return this;
}

example usage

...
if(!(image instanceof Image))
  throw new TypeError('Only escpos.Image supported');
density = density || 'd24';
var n = !!~[ 'd8', 's8' ].indexOf(density) ? 1 : 3;
var header = _.BITMAP_FORMAT['BITMAP_' + density.toUpperCase()];
var bitmap = image.toBitmap(n * 8);
var self = this;
this.lineSpace(0); // set line spacing to 0
bitmap.data.forEach(function (line) {
  self.buffer.write(header);
  self.buffer.writeUInt16LE(line.length / n);
  self.buffer.write(line);
  self.buffer.write(_.EOL);
});
// restore line spacing to default
...

function escpos.printer.prototype.marginBottom (size)

description and source-code

marginBottom = function (size){
  this.buffer.write(_.MARGINS.BOTTOM);
  this.buffer.writeUInt8(size);
  return this;
}

example usage
```
n/a
```

function escpos.printer.prototype.marginLeft (size)

description and source-code

marginLeft = function (size){
  this.buffer.write(_.MARGINS.LEFT);
  this.buffer.writeUInt8(size);
  return this;
}

example usage
```
n/a
```

function escpos.printer.prototype.marginRight (size)

description and source-code

marginRight = function (size){
  this.buffer.write(_.MARGINS.RIGHT);
  this.buffer.writeUInt8(size);
  return this;
}

example usage
```
n/a
```

function escpos.printer.prototype.print (content)

description and source-code

print = function (content){
  this.buffer.write(content);
  return this;
}

example usage

...
/**
* [function println]
* @param  {[String]}  content  [description]
* @param  {[String]}  encoding [description]
* @return printer instance
*/
Printer.prototype.println = function(content){
 return this.print([ content, _.EOL ].join(''));
};

/**
* [function Print alpha-numeric text]
* @param  {[String]}  content  [description]
* @param  {[String]}  encoding [description]
* @return printer instance
...

function escpos.printer.prototype.println (content)

description and source-code

println = function (content){
  return this.print([ content, _.EOL ].join(''));
}

example usage
```
n/a
```

function escpos.printer.prototype.qrcode (code, version, level, size)

description and source-code

qrcode = function (code, version, level, size){
  this.buffer.write(_.CODE2D_FORMAT.TYPE_QR);
  this.buffer.write(_.CODE2D_FORMAT.CODE2D);
  this.buffer.writeUInt8(version || 3);
  this.buffer.write(_.CODE2D_FORMAT[
    'QR_LEVEL_' + (level || 'L').toUpperCase()
  ]);
  this.buffer.writeUInt8(size || 6);
  this.buffer.writeUInt16LE(code.length);
  this.buffer.write(code);
  return this;
}

example usage
```
n/a
```

function escpos.printer.prototype.qrimage (content, options, callback)

description and source-code

qrimage = function (content, options, callback){
  var self = this;
  if(typeof options == 'function'){
    callback = options;
    options = null;
  }
  options = options || { type: 'png', mode: 'dhdw' };
  var buffer = qr.imageSync(content, options);
  var type = [ 'image', options.type ].join('/');
  getPixels(buffer, type, function (err, pixels) {
    if(err) return callback && callback(err);
    self.raster(new Image(pixels), options.mode);
    callback && callback.call(self, null, self);
  });
  return this;
}

example usage

...
  .font('a')
  .align('ct')
  .style('bu')
  .size(1, 1)
  .text('The quick brown fox jumps over the lazy dog')
  .text('敏捷的棕色狐狸跳过懒狗')
  .barcode('12345678', 'EAN8')
  .qrimage('https://github.com/song940/node-escpos', function(err){
    this.cut();
    this.close();
  });

});
...

function escpos.printer.prototype.raster (image, mode)

description and source-code

raster = function (image, mode) {
  if(!(image instanceof Image))
    throw new TypeError('Only escpos.Image supported');
  mode = mode || 'normal';
  if (mode === 'dhdw' ||
      mode === 'dwh'  ||
      mode === 'dhw') mode = 'dwdh';
  var raster = image.toRaster();
  var header = _.GSV0_FORMAT['GSV0_' + mode.toUpperCase()];
  this.buffer.write(header);
  this.buffer.writeUInt16LE(raster.width);
  this.buffer.writeUInt16LE(raster.height);
  this.buffer.write(raster.data);
  return this;
}

example usage

...
   options = null;
 }
 options = options || { type: 'png', mode: 'dhdw' };
 var buffer = qr.imageSync(content, options);
 var type = [ 'image', options.type ].join('/');
 getPixels(buffer, type, function (err, pixels) {
   if(err) return callback && callback(err);
   self.raster(new Image(pixels), options.mode);
   callback && callback.call(self, null, self);
 });
 return this;
};

/**
* [image description]
...

function escpos.printer.prototype.size (width, height)

description and source-code

size = function (width, height) {

  if (2 >= width && 2 >= height) {

    this.buffer.write(_.TEXT_FORMAT.TXT_NORMAL);

    if (2 == width && 2 == height) {
      this.buffer.write(_.TEXT_FORMAT.TXT_4SQUARE);
    }
    else if (1 == width && 2 == height) {
      this.buffer.write(_.TEXT_FORMAT.TXT_2HEIGHT);
    }
    else if (2 == width && 1 == height) {
      this.buffer.write(_.TEXT_FORMAT.TXT_2WIDTH);
    }

  }
  else {

    this.buffer.write(_.TEXT_FORMAT.TXT_SIZE);
    this.buffer.write(_.TEXT_FORMAT.TXT_WIDTH[(8 >= width) ? width : 8]);
    this.buffer.write(_.TEXT_FORMAT.TXT_HEIGHT[(8 >= height) ? height : 8]);

  }

  return this;

}

example usage

...

device.open(function(){

printer
.font('a')
.align('ct')
.style('bu')
.size(1, 1)
.text('The quick brown fox jumps over the lazy dog')
.text('敏捷的棕色狐狸跳过懒狗')
.barcode('12345678', 'EAN8')
.qrimage('https://github.com/song940/node-escpos', function(err){
  this.cut();
  this.close();
});
...

function escpos.printer.prototype.style (type)

description and source-code

style = function (type){
  switch(type.toUpperCase()){

    case 'B':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL_OFF);
      break;
    case 'I':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL_OFF);
      break;
    case 'U':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL_ON);
      break;
    case 'U2':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL2_ON);
      break;

    case 'BI':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL_OFF);
      break;
    case 'BIU':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL_ON);
      break;
    case 'BIU2':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL2_ON);
      break;
    case 'BU':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL_ON);
      break;
    case 'BU2':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL2_ON);
      break;
    case 'IU':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL_ON);
      break;
    case 'IU2':
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_ON);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL2_ON);
      break;

    case 'NORMAL':
    default:
      this.buffer.write(_.TEXT_FORMAT.TXT_BOLD_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_ITALIC_OFF);
      this.buffer.write(_.TEXT_FORMAT.TXT_UNDERL_OFF);
      break;

  }
  return this;
}

example usage

...
const printer = new escpos.Printer(device);

device.open(function(){

printer
.font('a')
.align('ct')
.style('bu')
.size(1, 1)
.text('The quick brown fox jumps over the lazy dog')
.text('敏捷的棕色狐狸跳过懒狗')
.barcode('12345678', 'EAN8')
.qrimage('https://github.com/song940/node-escpos', function(err){
  this.cut();
  this.close();
...

function escpos.printer.prototype.text (content, encoding)

description and source-code

text = function (content, encoding){
  return this.print(iconv.encode(content + _.EOL, encoding || 'GB18030'));
}

example usage

...
device.open(function(){

printer
.font('a')
.align('ct')
.style('bu')
.size(1, 1)
.text('The quick brown fox jumps over the lazy dog')
.text('敏捷的棕色狐狸跳过懒狗')
.barcode('12345678', 'EAN8')
.qrimage('https://github.com/song940/node-escpos', function(err){
  this.cut();
  this.close();
});
...

module escpos.serial

function escpos.serial (port, options)

description and source-code

function Serial(port, options){
  var self = this;
  options = options || {
    baudrate: 9600,
    autoOpen: false
  };
  this.device = new SerialPort(port, options);
  this.device.on('close', function() {
    self.emit('disconnect', self.device);
    self.device = null;
  });
  EventEmitter.call(this);
  return this;
}

example usage
```
n/a
```

function escpos.serial.super_ ()

description and source-code

function EventEmitter() {
  EventEmitter.init.call(this);
}

example usage
```
n/a
```

module escpos.serial.prototype

function escpos.serial.prototype.close (callback)

description and source-code

close = function (callback) {
  var self = this;
  this.device.drain(function(err) {
    self.device.close();
    self.device = null;
    callback && callback(err, self.device);
  });
  return this;
}

example usage

...
  .style('bu')
  .size(1, 1)
  .text('The quick brown fox jumps over the lazy dog')
  .text('敏捷的棕色狐狸跳过懒狗')
  .barcode('12345678', 'EAN8')
  .qrimage('https://github.com/song940/node-escpos', function(err){
    this.cut();
    this.close();
  });

});


````
----
...

function escpos.serial.prototype.open (callback)

description and source-code

open = function (callback){
  this.device.open(callback);
  return this;
}

example usage

...
// Select the adapter based on your printer type
const device  = new escpos.USB();
// const device  = new escpos.Network('localhost');
// const device  = new escpos.Serial('/dev/usb/lp0');

const printer = new escpos.Printer(device);

device.open(function(){

printer
.font('a')
.align('ct')
.style('bu')
.size(1, 1)
.text('The quick brown fox jumps over the lazy dog')
...

function escpos.serial.prototype.write (data, callback)

description and source-code

write = function (data, callback){
  this.device.write(data, callback);
  return this;
}

example usage

...

/**
* Fix bottom margin
* @param  {[String]} size
* @return printer instance
*/
Printer.prototype.marginBottom = function(size){
 this.buffer.write(_.MARGINS.BOTTOM);
 this.buffer.writeUInt8(size);
 return this;
};

/**
* Fix left margin
* @param  {[String]} size
...

api documentation for escpos (v2.4.0)

ESC/POS Printer driver for nodejs

table of contents