Manual control axidraw to help with registration

axidraw-manual-control.js

/*
This requires nodejs to run
install
npm install terminal-kit
npm install superagent

run
node axidraw-manual-control.js

Keys
left, right, up, down -> control pen position
+ , - -> control movement increments
a , z -> control pen height
*/

var term = require( 'terminal-kit' ).terminal ;
var request = require('superagent');

// go Home

request
  .put('localhost:4242/v1/pen')
  .send({ state: 0})
  .end(function(err, res){});

request
  .put('localhost:4242/v1/pen')
  .send({ x: 0, y: 0 })
  .set('Accept', 'application/json')
  .end(function(err, res){});


// axidraw width: 29.9cm
var canvasWidth = 29.9;
// axidraw height 21.6
var canvasHeight = 21.6;
var x = 0;
var y = 0;
var increment = 30;
var penHeight = 0;

// applys increments in mm
function applyIncrement(increment, direction) {
  var result = 0;
  if(direction === 'x'){
    result = increment * canvasWidth / 100 ;
  } else if(direction === 'y') {
    result = increment * canvasHeight / 100;
  }
  if( result < 0) result = 0;
  if(result > 100) result = 100;
  return result;
}

term.grabInput() ;

term.on( 'key' , function( name , matches , data ) {  
  term.clear() ;
  // console.log( "'key' event:" , name ) ;
  if(name === '0') {
      x = 0;
      y = 0;
  }
  if(name === 'RIGHT') {
      x += applyIncrement(increment, 'x');
  }
  else if(name === 'LEFT') {
      x -= applyIncrement(increment, 'x');
  }
  else if(name === 'DOWN') {
      y += applyIncrement(increment, 'y');
  }
  else if(name === 'UP') {
      y -= applyIncrement(increment, 'y');
  }
  else if(name === '+') {
    if (increment < 1) {
      increment += 0.1;
    }else { 
      increment += 1;
    }
    term.green( 'increment: ' + increment + "% \n") ;
  }
  else if(name === '-') {
    if(increment > 0) {
      if (increment <= 1) {
        increment -= 0.1;
      }else { 
        increment -= 1;
      }
      term.green( 'increment: ' + increment + "%\n") ;
    }
  }
  else if(name === 'a' || name === 'z'){
    if(name === 'a') {
      if(penHeight < 1) {
        penHeight += 0.05;
      }
    }
    else if(name === 'z') {
      if(penHeight > 0) {
        penHeight -= 0.05;
      }
    }
    request
      .put('localhost:4242/v1/pen')
      .send({ state: penHeight})
      .end(function(err, res){});
    term.green( 'penHeight: ' + penHeight.toFixed(2) + "\n") ;
  }

  request
  .put('localhost:4242/v1/pen')
  .send({ x: x, y: y})
    .end(function(err, res){
      term.green( 'x: ' + (x * canvasWidth / 100).toFixed(2) +'cm y: ' + (y * canvasHeight / 100).toFixed(2) +"cm\n") ;
    });
  // Detect CTRL-C and exit 'manually'
  if ( name === 'CTRL_C' || name === 'q' ) { process.exit() ; }
}) ;