float MID = 250;



ArrayList lines = new ArrayList();


void setup(){
   size(500,500);
    stroke(255);
   strokeWeight(2); 
}
void draw(){
  background(0,0,128);
   strokeWeight(2);
   stroke(255);
  for(Line n : lines){
    n.draw();
  }  
  stroke(255,0,0);
  strokeWeight(1);
  if(mousePressed){
     line(startX,startY,mouseX,mouseY); 
  }
  if(lines.size() == 0){
    for(int i = 0; i < 6;i++){
       float a =( PI/2) +( PI / 3 * i);
      line(MID,MID,MID+cos(a)*10,MID+sin(a)*10); 
    }
  }
}

void keyPressed(){
      if(key == ' ') {
reset();
	}
}

void reset(){
	lines = new ArrayList<Line>();

}

float startX, startY;
void mouseDragged(){
//mousePressed();
}
void mousePressed(){
  startX = mouseX;
  startY = mouseY;
}



void mouseReleased(){
  float angStart = atan2(startY-MID,startX-MID);
  float disStart = dist(MID,MID,startX,startY);
  Point pStart = getPointFromCenter(angStart,disStart);

  float angEnd = atan2(mouseY-MID,mouseX-MID);
  float disEnd = dist(MID,MID,mouseX,mouseY);
  Point pEnd = getPointFromCenter(angEnd,disEnd);

  for(int i = 0; i < 4; i++){
     float angStartRot1 = angStart + (i) * (PI/3);
     float angEndRot1 = angEnd + (i) * (PI/3);
     float angStartRot2 = angStart - (i) * (PI/3);
     float angEndRot2 = angEnd - (i) * (PI/3);
    
    Point pStart1 = getPointFromCenter(angStartRot1,disStart);
    Point pEnd1 = getPointFromCenter(angEndRot1,disEnd);
    lines.add(new Line(pStart1.x,pStart1.y,pEnd1.x,pEnd1.y));

    Point pStart2 = getPointFromCenter(angStartRot2,disStart);
    Point pEnd2 = getPointFromCenter(angEndRot2,disEnd);
   lines.add(new Line(pStart2.x,pStart2.y,pEnd2.x,pEnd2.y));
    
  }

  lines.add(new Line(pStart.x,pStart.y,pEnd.x,pEnd.y));
  
}


class Line{
  float x1,y1,x2,y2;
  Line(float px1,float py1,float px2,float py2){
     x1 = px1;
     y1 = py1;
    x2 = px2;
   y2 = py2; 
  }
  void draw(){
    stroke(255);
     line(x1,y1,x2,y2); 
     float xMid = (x1+x2)/2;
     float yMid = (y1+y2)/2;
     float ang =  atan2(y1-yMid,x1-xMid);
      float dis = dist(x1,y1,x2,y2) / 32;
      ang += PI/2;
      float xc1 = xMid+(dis*cos(ang));
      float yc1 = yMid+(dis*sin(ang));
      ang += PI;
      float xc2 = xMid+(dis*cos(ang));
      float yc2 = yMid+(dis*sin(ang));
      triangle(x1,y1,x2,y2,xc1,yc1);
      triangle(x1,y1,x2,y2,xc2,yc2);
      
      

     
  }
}

Point getPointFromCenter(float ang, float dis){
    return new Point(MID+cos(ang)*dis,MID+sin(ang)*dis);
}


class Point{
  float x, y;
  Point(float x, float y){
     this.x = x;
    this.y = y; 
  }
}