/*
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This is a plug-in for GIMP.
 *
 * Generates images containing vector type drawings.
 *
 * Copyright (C) 1997 Andy Thomas  alt@picnic.demon.co.uk
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */

#include "config.h"

#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>

#include "gfig.h"
#include "gfig-dobject.h"
#include "gfig-rectangle.h"

#include "libgimp/stdplugins-intl.h"

static void        d_draw_rectangle   (GfigObject *obj,
                                       cairo_t    *cr);
static void        d_paint_rectangle  (GfigObject *obj);
static GfigObject *d_copy_rectangle   (GfigObject *obj);

static void        d_update_rectangle (GdkPoint   *pnt);

static void
d_draw_rectangle (GfigObject *obj,
                  cairo_t    *cr)
{
  DobjPoints *first_pnt;
  DobjPoints *second_pnt;
  gint        xmin, ymin;
  gint        xmax, ymax;

  first_pnt = obj->points;

  if (!first_pnt)
    return; /* End-of-line */

  draw_sqr (&first_pnt->pnt, obj == gfig_context->selected_obj, cr);

  second_pnt = first_pnt->next;

  if (!second_pnt)
    return;

  if (obj == obj_creating)
    draw_circle (&second_pnt->pnt, TRUE, cr);
  else
    draw_sqr (&second_pnt->pnt, obj == gfig_context->selected_obj, cr);

  xmin = MIN (gfig_scale_x (first_pnt->pnt.x),
              gfig_scale_x (second_pnt->pnt.x));
  ymin = MIN (gfig_scale_y (first_pnt->pnt.y),
              gfig_scale_y (second_pnt->pnt.y));
  xmax = MAX (gfig_scale_x (first_pnt->pnt.x),
              gfig_scale_x (second_pnt->pnt.x));
  ymax = MAX (gfig_scale_y (first_pnt->pnt.y),
              gfig_scale_y (second_pnt->pnt.y));

  cairo_rectangle (cr, xmin + .5, ymin + .5, xmax - xmin, ymax - ymin);
  draw_item (cr, FALSE);
}

static void
d_paint_rectangle (GfigObject *obj)
{
  DobjPoints *first_pnt;
  DobjPoints *second_pnt;
  gdouble     dpnts[4];

  g_assert (obj != NULL);

  /* Drawing rectangles is hard .
   * 1) select rectangle
   * 2) stroke it
   */
  first_pnt = obj->points;

  if (!first_pnt)
    return; /* End-of-line */

  second_pnt = first_pnt->next;

  if (!second_pnt)
    {
      g_error ("Internal error - rectangle no second pnt");
    }

  dpnts[0] = (gdouble) MIN (first_pnt->pnt.x, second_pnt->pnt.x);
  dpnts[1] = (gdouble) MIN (first_pnt->pnt.y, second_pnt->pnt.y);
  dpnts[2] = (gdouble) MAX (first_pnt->pnt.x, second_pnt->pnt.x);
  dpnts[3] = (gdouble) MAX (first_pnt->pnt.y, second_pnt->pnt.y);

  /* Scale before drawing */
  if (selvals.scaletoimage)
    scale_to_original_xy (&dpnts[0], 2);
  else
    scale_to_xy (&dpnts[0], 2);

  if (gfig_context_get_current_style ()->fill_type != FILL_NONE)
    {
      gimp_context_push ();
      gimp_context_set_feather (selopt.feather);
      gimp_context_set_feather_radius (selopt.feather_radius, selopt.feather_radius);
      gimp_image_select_rectangle (gfig_context->image_id,
                                   selopt.type,
                                   dpnts[0], dpnts[1],
                                   dpnts[2] - dpnts[0],
                                   dpnts[3] - dpnts[1]);
      gimp_context_pop ();

      paint_layer_fill (dpnts[0], dpnts[1], dpnts[2], dpnts[3]);
      gimp_selection_none (gfig_context->image_id);
    }

  if (obj->style.paint_type == PAINT_BRUSH_TYPE)
    {
      gdouble line_pnts[] = { dpnts[0], dpnts[1], dpnts[2], dpnts[1],
                              dpnts[2], dpnts[3], dpnts[0], dpnts[3],
                              dpnts[0], dpnts[1] };

      gfig_paint (selvals.brshtype, gfig_context->drawable_id, 10, line_pnts);
    }
}

static GfigObject *
d_copy_rectangle (GfigObject * obj)
{
  GfigObject *new_rectangle;

  g_assert (obj->type == RECTANGLE);

  new_rectangle = d_new_object (RECTANGLE,
                                obj->points->pnt.x, obj->points->pnt.y);
  new_rectangle->points->next = d_copy_dobjpoints (obj->points->next);

  return new_rectangle;
}

void
d_rectangle_object_class_init (void)
{
  GfigObjectClass *class = &dobj_class[RECTANGLE];

  class->type      = RECTANGLE;
  class->name      = "RECTANGLE";
  class->drawfunc  = d_draw_rectangle;
  class->paintfunc = d_paint_rectangle;
  class->copyfunc  = d_copy_rectangle;
  class->update    = d_update_rectangle;
}

static void
d_update_rectangle (GdkPoint *pnt)
{
  DobjPoints *first_pnt;
  DobjPoints *second_pnt;

  first_pnt = obj_creating->points;

  if (!first_pnt)
    return; /* No points */

  if ((second_pnt = first_pnt->next))
    {
      second_pnt->pnt.x = pnt->x;
      second_pnt->pnt.y = pnt->y;
    }
  else
    {
      second_pnt = new_dobjpoint (pnt->x, pnt->y);
      first_pnt->next = second_pnt;
    }
}

void
d_rectangle_start (GdkPoint *pnt,
                   gboolean  shift_down)
{
  obj_creating = d_new_object (RECTANGLE, pnt->x, pnt->y);
}

void
d_rectangle_end (GdkPoint *pnt,
                 gboolean  shift_down)
{
  /* Under control point */
  if (!obj_creating->points->next)
    {
      /* No circle created */
      free_one_obj (obj_creating);
    }
  else
    {
      add_to_all_obj (gfig_context->current_obj, obj_creating);
    }

  obj_creating = NULL;
}