import sub_arctic.lib.*;
import sub_arctic.constraints.std_function;
import sub_arctic.constraints.constraint;
import sub_arctic.input.callback_object;
import sub_arctic.input.event;
import sub_arctic.output.drawable;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;

import java.io.*;
import java.util.*;

/** 
 * Applet to demo of spring example
 * @author Khai Truong
 */
public class spring_example
  extends debug_interactor_applet 
  implements callback_object, 
             cycle_handler 
{
  //----------------------------------------------------------------------------
  // MAIN METHOD
  //----------------------------------------------------------------------------

  /**
   * Main method
   * @param argv is the array of String command line arguments
   */
  public static void main(String argv[])
  {
    spring_example se = new spring_example();
    interactor_frame f = new interactor_frame("Spring Example",se,650,300);
    f.setVisible(true);
  } // end of main()

  public static final int parent_width = 400;
  public static final int parent_height = 150;
  
  public static final int object_width = 50;
  public static final int object_height = 30;

  public static final int strut_width = 50;
  public static final int strut_height = 30;
  
  public static final int spring_height = 30;

  protected labeled_object parent_obj, obj1, obj2, obj3;
  protected labeled_strut st1, st2;
  protected labeled_spring sp1, sp2;
  protected scale a_slider;
  
  /** 
   * Initialization of sub_arctic interface when applet starts 
   */
  public void build_ui(base_parent_interactor top) 
  {
    Font lab_font = new Font("Helvetica",Font.BOLD,12);

    //// build overall column
    column ui_col = new column(2,column.LEFT_JUSTIFIED);
    ui_col.set_pos(10,10);
    top.add_child(ui_col);

    //// Put a title label in
    ui_col.add_child(new label("Springs, Struts & Objects example",new Font("Helvetica", Font.BOLD, 16)));

    //// build our objects
    parent_obj = new labeled_object(parent_width,parent_height,"parent_obj");
    obj1 = new labeled_object(object_width,object_height,"obj1");
    obj2 = new labeled_object(object_width,object_height,"obj2");
    obj3 = new labeled_object(object_width,object_height,"obj3");

    st1 = new labeled_strut(strut_width,strut_height,"st1");
    st2 = new labeled_strut(strut_width,strut_height,"st2");

    int sp_s = (parent_obj.w() - obj1.w() - obj2.w() - obj3.w() - st1.w() - st2.w()) / 2;
    sp1 = new labeled_spring(sp_s,spring_height,"sp1");
    sp2 = new labeled_spring(sp_s,spring_height,"sp2");

    //// put them in our test hierarchy
    parent_obj.add_child(st1);
    st1.set_x(0);     st1.set_y(parent_obj.h()/2 - st1.h()/2);

    parent_obj.add_child(obj1);
    obj1.set_x(st1.w());     obj1.set_y(parent_obj.h()/2 - obj1.h()/2);

    parent_obj.add_child(sp1);
    sp1.set_x(st1.w() + obj1.w());     sp1.set_y(parent_obj.h()/2 - sp1.h()/2);

    parent_obj.add_child(obj2);
    obj2.set_x(parent_obj.w()/2-obj2.w()/2);     obj2.set_y(parent_obj.h()/2 - obj2.h()/2);
    
    parent_obj.add_child(sp2);
    sp2.set_x(parent_obj.w()-st2.w()-obj3.w()-sp2.w());     sp2.set_y(parent_obj.h()/2 - sp2.h()/2);

    parent_obj.add_child(obj3);
    obj3.set_x(parent_obj.w()-st2.w()-obj3.w());     obj3.set_y(parent_obj.h()/2 - obj3.h()/2);
    
    parent_obj.add_child(st2);
    st2.set_x(parent_obj.w()-st2.w());     st2.set_y(parent_obj.h()/2 - st2.h()/2);


    ui_col.add_child(parent_obj);
    
    
    
    
    
    
    
    
    
    a_slider = new scale(5,0, 250, 10,200, 100, 10, this);
    a_slider.set_value(0);
    ui_col.add_child(a_slider);
    
    
    
    
    
    
    
    
    
    //// constraints

    //// keep struts where they are
    st1.set_x_constraint(std_function.offset(PARENT.X(), 0));
    st2.set_x_constraint(std_function.offset(PARENT.W(), -(st2.w()+1)));
    
    
    

    
    
    
    
    
    
    
    
    //// keep obj2 centered
    obj2.set_x_constraint(std_function.centered(PARENT.W(), 0));
    
    
    
    
    
    
    
    
    
    
    
    //// move obj1 and obj3
    obj1.set_x_constraint(std_function.offset(OTHER.OBJ(st1).W(), 0));
    obj3.set_x_constraint(std_function.offset(OTHER.OBJ(st2).X(), -obj3.w()));

    
    
    
    
    
    
    //// move sp1 and sp2
    sp1.set_x_constraint(std_function.offset(OTHER.OBJ(obj1).X2(), 0));
    sp1.set_w_constraint(std_function.subtract(OTHER.OBJ(obj2).X1(), OTHER.OBJ(obj1).X2(),0));
    sp2.set_x_constraint(std_function.offset(OTHER.OBJ(obj2).X2(), 0));
    sp2.set_w_constraint(std_function.subtract(OTHER.OBJ(obj3).X1(), OTHER.OBJ(obj2).X2(),0));
    
    
    
    /* setup to catch cycles in constraints with callback to us */
    manager.handle_cycles_with(manager.EXCEPTION_CUSTOM, this);

  }

  /** 
   * Handle callbacks. 
   */
  public void callback(interactor from, 
                       event evt, 
                       int cb_num, 
                       Object cb_parm) 
  {
    if (from == a_slider)
    {
      parent_obj.set_w(parent_width + a_slider.value());
    }
  }
  
  /** 
   * Handle cycle_detection 
   */
  public boolean handle_cycle(interactor in_obj, 
                              int part_code)
  {
    //// chance to handle cycles...
    return true;
  }

} // end of spring_example class