//
//  snap_plugin.c
//  
//  Created by Parker, Charles W. on 2018-06-03.
//

#include <stdio.h>

#include "globalconst.h"
#include "global.h" // types

#include "crosshair.h"
#include "snap.h"

/* Snap to elements */
static SnapType
snap_to_element_centers(Coord x, Coord y, Coord r)
{
  SnapType snap;
  void *p1, *p2, *p3;
  snap.valid = false;
  
  /* if we're not drawing rats, check for elements first */
  if (PCB->RatDraw) return snap;
  
  snap.obj_type = SearchObjectByLocation (ELEMENT_TYPE, &p1, &p2, &p3,
                                          x, y, r);
  
  if (snap.obj_type & ELEMENT_TYPE)
  {
    /* if we found an element, check to see if we should snap to it */
    ElementType *el = (ElementType *) p1;
    snap.loc.X = (el->BoundingBox.X1 - el->BoundingBox.X2) / 2; 
    snap.loc.Y = (el->BoundingBox.Y1 - el->BoundingBox.Y2) / 2;
    snap.distsq = square(snap.loc.X - x) + square(snap.loc.Y - y);
    snap.valid = true;
  }
  return snap;
}

static SnapSpecType element_center_snap = {
  "Snap to element centers",// Name
  &snap_to_element_centers, // Function pointer
  true,                     // enabled
  15,                       // priority
  1000000,                  // radius (nm)
  0                         // object type
};


void
pcb_plugin_init()
{
  printf("Loading plugin: snap to element centers\n");
  snap_list_add_snap(Crosshair.snaps, &element_center_snap);
}