just another inlet to tributary

inlet.js

var pathWay = [];
var back = [];
var joined;


Array.prototype.remove = function(from, to) {
  var rest = this.slice((to || from) + 1 || this.length);
  this.length = from < 0 ? this.length + from : from;
  return this.push.apply(this, rest);
};
  
var path = g.append('path')
            .attr('stroke','red')
            .attr('stroke-width','2')
            .attr('fill',"none")
            .attr('id','path')
            .attr('fill-opacity','0.5')
            .attr('class','drawit')
            .attr('transform','scale(1)')
            .attr('id','pathWay')
			.attr('d','')
    
    
var convexHull = g.append('path')
            .attr('stroke','red')
            .attr('stroke-width','2')
            .attr('fill',"none")
            .attr('id','path')
            .attr('fill-opacity','0.5')
            .attr('class','drawit')
            .attr('transform','scale(1)')
            .attr('id','pathWay')
			.attr('d','')
        
    
     
    g.on('click',function(){
      console.log('dfgsd')
      pathWay.push(d3.mouse(this))
      back.push([d3.mouse(this)[0]+100,d3.mouse(this)[1]])
      redraw()
    
    }).on('mousedown',function(){
    	plab = 'sdfds'
    
    }).on('mouseup',function(){
    	console.log(plab)
    
    })
      
      
      
      function redraw(){
		var curve = '';
        for(i in pathWay){
      	var e = pathWay[i];
          
        var x = e[0];
        var y = e[1];   
          
        if(curve == ''){
        
        curve  = 'M'+x+','+y+' ';
      	
      }else{
         curve  += 'L'+x+','+y+' '
        
      }
        
         
        
        }
        
    for(i in back){
      	var e = back[i];
          
        var x = e[0];
        var y = e[1];   
          
          if(i == 0){
                
                curve  += 'M'+x+','+y+' ';
          } else{
             curve  += 'L'+x+','+y+' '
            
           }
             
        
        
        }    
        
        
       console.log('sdfsdfsdfsdfsdfsd',curve) 
       path.attr('d',curve)
    	
	
       joined = pathWay.concat(back); 
       var curve = createConvexHull('');
       convexHull.attr('d',curve)
      
      
      }




function createConvexHull(curve){
	
 	   var smi;
  	   var index;
      	var changed = false;
        for(i in joined){
        
          var current = joined[i];
          var x = current[0];
		  var y = current[1];
          
          if(!smi){
          	smi = current;
            changed = true;
            index = i;
          }else{
          
          	if(x < smi[0]){
            	smi = current;
              changed = true;
              index = i;
            }
              
            
			if(x == smi[0] && y < smi[1]){
            	 smi = current;
              changed = true;
              index = i;
            }
             
            if(changed){
            
              	
              
            }
            
            
          
          }
        }
	   if(curve == '')
         curve += 'M'+smi[0]+','+smi[1]+' '
       else
         curve += 'L'+smi[0]+','+smi[1]+' '
  
	   
       console.log('Curve',curve,'SMI',smi)
	   return curve; 

}