noflo-ccv to cropping bounds

bounds.js

var noflo = require('noflo');

exports.getComponent = function () {
  var c = new noflo.Component();
  
  c.icon = "circle-o"
  
  c.inPorts.add('faces');  
  c.outPorts.add('circles');
  c.outPorts.add('dimensions');
  
  c.inPorts.faces.on('data', function(data){
    var dims = {
      minX: Infinity,
      minY: Infinity,
      maxX: -Infinity,
      maxY: -Infinity,
      width: 0,
      height: 0,
      ratio: 1
    };
    
    var circles = data.map(function(face){
      if (dims.minX > face.x) {
        dims.minX = face.x
      }
      if (dims.minY > face.y) {
        dims.minY = face.y
      }
      if (dims.maxX < face.x+face.width) {
        dims.maxX = face.x+face.width
      }
      if (dims.maxY < face.y+face.height) {
        dims.maxY = face.y+face.height
      }
      var circle = [
        face.x + face.width/2, 
        face.y + face.height/2, 
        face.height,
        0,
        Math.PI*2
      ];
      circle.type = 'arc';
      return circle;
    });
    
    if (c.outPorts.circles.isAttached()) {
	  c.outPorts.circles.send(circles);
    }
    
    if (isFinite(dims.minX) && isFinite(dims.minY) && isFinite(dims.maxX) && isFinite(dims.maxY)) {
      dims.minX = Math.round(dims.minX);
      dims.minY = Math.round(dims.minY);
      dims.maxX = Math.round(dims.maxX);
      dims.maxY = Math.round(dims.maxY);
      dims.width = dims.maxX - dims.minX;
      dims.height = dims.maxY - dims.minY;
      dims.ratio = dims.width/dims.height;
      if (c.outPorts.dimensions.isAttached()) {
		c.outPorts.dimensions.send(dims);
      }
    } else {
      // No faces
    }
  });

  return c;
};