Hi i am having problem with drawing the line from the previously mouse clicked and current mouse clicked location.
I got the distance but cant get the line. my code is as follwoing.



int x1 = 0,x2 = 0,y1 = 0,y2 = 0;
float TotalDistance;
boolean flag=false;

void setup()
{
        size(600,600);
        background(255);
       
      
}

void draw()
{

}


void mouseClicked()
{
   
              if(flag==true)
              {     
                  x2 = mouseX;
                  y2 = mouseY;
                 
 
               TotalDistance=distance(x1,x2,y1,y2);
               DrawLine(x1,x2,y1,y2);
               //line(x1,y1,x2,y2);
               background(255);
               textSize(30);
               fill(255,0,0);
               text(TotalDistance, 50,20);
              
                 x1 = 0;
                 y1 = 0;
                 x2 = 0;
                 y2 = 0; 
                 flag = false;
              }
              
              
              else
              {
                 x1 = mouseX;
                 y1 = mouseY;
                 flag = true;
               
              }
     
     
}

float distance(int x1,int x2,int y1,int y2)
{         
          float TotalDistance = sqrt(sq(x2-x1) + sq(y2-y1));
          return TotalDistance;
}

void DrawLine(int x1,int x2,int y1,int y2)
{
    stroke(125);
    line(x1,y1,x2,y2);
}