/*
 * Rectangle.c -- Implementation of rectangle item.
 *
 * Authors		: Patrick Lecoanet.
 * Creation date	: Fri Dec  2 14:47:42 1994
 *
 * $Id$
 */

/*
 *  Copyright (c) 1993 - 1999 CENA, Patrick Lecoanet --
 *
 * This code is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This code 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this code; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */


#include <malloc.h>

#include "Item.h"
#include "Geo.h"
#include "Draw.h"
#include "Types.h"
#include "Image.h"
#include "Color.h"
#include "WidgetInfo.h"
#include "tkZinc.h"


static const char rcsid[] = "$Id$";
static const char compile_id[]="$Compile: " __FILE__ " " __DATE__ " " __TIME__ " $";

/*
 * Bit offset of flags.
 */
#define	FILLED_BIT	1	/* If the rectangle is filled with color/pattern */
#define ALIGNED_BIT	2


/*
 **********************************************************************************
 *
 * Specific Rectangle item record
 *
 **********************************************************************************
 */

typedef struct _RectangleItemStruct {
  ItemStruct	header;

  /* Public data */
  ZnPoint	coords[2];
  unsigned short flags;
  ReliefStyle	relief;
  LineStyle	line_style;
  ZnDim		line_width;
  ZnGradient	*line_color;
  ZnImage	fill_pattern;
  ZnImage	line_pattern;
  ZnGradient	*fill_color;
  ZnImage	tile;
  
  /* Private data */
  ZnPoint	dev[4];
  ZnGradient	*gradient;
  ZnPoint	*grad_geo;
} RectangleItemStruct, *RectangleItem;


static ZnAttrConfig	rect_attrs[] = {
  { ZN_CONFIG_BOOL, "-composealpha", NULL,
    Tk_Offset(RectangleItemStruct, header.flags), COMPOSE_ALPHA_BIT,
    ZN_DRAW_FLAG, False },
  { ZN_CONFIG_BOOL, "-composerotation", NULL,
    Tk_Offset(RectangleItemStruct, header.flags), COMPOSE_ROTATION_BIT,
    ZN_COORDS_FLAG, False },
  { ZN_CONFIG_BOOL, "-composescale", NULL,
    Tk_Offset(RectangleItemStruct, header.flags), COMPOSE_SCALE_BIT,
    ZN_COORDS_FLAG, False },
  { ZN_CONFIG_GRADIENT, "-fillcolor", NULL,
    Tk_Offset(RectangleItemStruct, fill_color), 0,
    ZN_COORDS_FLAG|ZN_BORDER_FLAG, False },
  { ZN_CONFIG_BOOL, "-filled", NULL,
    Tk_Offset(RectangleItemStruct, flags), FILLED_BIT, ZN_COORDS_FLAG, False },
  { ZN_CONFIG_BITMAP, "-fillpattern", NULL,
    Tk_Offset(RectangleItemStruct, fill_pattern), 0, ZN_DRAW_FLAG, False },
  { ZN_CONFIG_GRADIENT, "-linecolor", NULL,
    Tk_Offset(RectangleItemStruct, line_color), 0,
    ZN_DRAW_FLAG, False },
  { ZN_CONFIG_BITMAP, "-linepattern", NULL,
    Tk_Offset(RectangleItemStruct, line_pattern), 0, ZN_DRAW_FLAG, False },
  { ZN_CONFIG_LINE_STYLE, "-linestyle", NULL,
    Tk_Offset(RectangleItemStruct, line_style), 0, ZN_DRAW_FLAG, False },
  { ZN_CONFIG_DIM, "-linewidth", NULL,
    Tk_Offset(RectangleItemStruct, line_width), 0, ZN_COORDS_FLAG, False },
  { ZN_CONFIG_PRI, "-priority", NULL,
    Tk_Offset(RectangleItemStruct, header.priority), 0,
    ZN_DRAW_FLAG|ZN_REPICK_FLAG, False },
  { ZN_CONFIG_RELIEF, "-relief", NULL, Tk_Offset(RectangleItemStruct, relief), 0,
    ZN_DRAW_FLAG, False },
  { ZN_CONFIG_BOOL, "-sensitive", NULL,
    Tk_Offset(RectangleItemStruct, header.flags), SENSITIVE_BIT,
    ZN_REPICK_FLAG, False },
  { ZN_CONFIG_TAG_LIST, "-tags", NULL,
    Tk_Offset(RectangleItemStruct, header.tags), 0, 0, False },
  { ZN_CONFIG_IMAGE, "-tile", NULL,
    Tk_Offset(RectangleItemStruct, tile), 0, ZN_DRAW_FLAG, False },
  { ZN_CONFIG_BOOL, "-visible", NULL,
    Tk_Offset(RectangleItemStruct, header.flags), VISIBLE_BIT,
    ZN_DRAW_FLAG|ZN_REPICK_FLAG|ZN_VIS_FLAG, False },
  
  { ZN_CONFIG_END, NULL, NULL, 0, 0, 0 }
};



/*
 **********************************************************************************
 *
 * Init --
 *
 **********************************************************************************
 */
static int
Init(Item		item,
     int		*argc,
     Tcl_Obj *CONST	*args[])
{
  WidgetInfo	*wi = item->wi;
  RectangleItem	rect = (RectangleItem) item;
  int		num_points;
  ZnPoint	*points;

  rect->gradient = NULL;
  rect->grad_geo = NULL;

  /* Init attributes */
  SET(item->flags, VISIBLE_BIT);
  SET(item->flags, SENSITIVE_BIT);
  SET(item->flags, COMPOSE_ALPHA_BIT);
  SET(item->flags, COMPOSE_ROTATION_BIT);
  SET(item->flags, COMPOSE_SCALE_BIT);
  item->priority = DEFAULT_RECTANGLE_PRIORITY;
  
  if (*argc < 1) {
    Tcl_AppendResult(wi->interp, " rectangle coords expected", NULL);
    return ZN_ERROR;
  }
  if (ZnParseCoordList(wi, (*args)[0], &points,
		       NULL, &num_points, NULL) == ZN_ERROR) {
    return ZN_ERROR;
  }
  if (num_points != 2) {
    Tcl_AppendResult(wi->interp, " malformed rectangle coords", NULL);
    return ZN_ERROR;
  };
  rect->coords[0] = points[0];
  rect->coords[1] = points[1];
  (*args)++;
  (*argc)--;
  
  CLEAR(rect->flags, FILLED_BIT);
  rect->relief = RELIEF_FLAT;
  rect->line_style = LINE_SIMPLE;
  rect->line_width = 1;
  rect->line_pattern = ZnUnspecifiedImage;
  rect->tile = ZnUnspecifiedImage;
  rect->fill_pattern = ZnUnspecifiedImage;
  rect->line_color = ZnGetGradientByValue(wi->fore_color);
  rect->fill_color = ZnGetGradientByValue(wi->fore_color);
  
  return ZN_OK;
}


/*
 **********************************************************************************
 *
 * Clone --
 *
 **********************************************************************************
 */
static void
Clone(Item	item)
{
  RectangleItem	rect = (RectangleItem) item;

  if (rect->gradient) {
    rect->gradient = ZnGetGradientByValue(rect->gradient);
  }
  if (rect->grad_geo) {
    ZnPoint *grad_geo = ZnMalloc(4*sizeof(ZnPoint));
    memcpy(grad_geo, rect->grad_geo, 4*sizeof(ZnPoint));
    rect->grad_geo = grad_geo;    
  }
  if (rect->tile != ZnUnspecifiedImage) {
    rect->tile = ZnGetImageByValue(rect->tile);
  }
  if (rect->line_pattern != ZnUnspecifiedImage) {
    rect->line_pattern = ZnGetImageByValue(rect->line_pattern);
  }
  if (rect->fill_pattern != ZnUnspecifiedImage) {
    rect->fill_pattern = ZnGetImageByValue(rect->fill_pattern);
  }
  rect->line_color = ZnGetGradientByValue(rect->line_color);
  rect->fill_color = ZnGetGradientByValue(rect->fill_color);
}


/*
 **********************************************************************************
 *
 * Destroy --
 *
 **********************************************************************************
 */
static void
Destroy(Item	item)
{
  RectangleItem	rect = (RectangleItem) item;

  if (rect->tile != ZnUnspecifiedImage) {
    ZnFreeImage(rect->tile);
    rect->tile = ZnUnspecifiedImage;
  }
  if (rect->gradient) {
    ZnFreeGradient(rect->gradient);
  }
  if (rect->line_pattern != ZnUnspecifiedImage) {
    ZnFreeImage(rect->line_pattern);
    rect->line_pattern = ZnUnspecifiedImage;
  }
  if (rect->fill_pattern != ZnUnspecifiedImage) {
    ZnFreeImage(rect->fill_pattern);
    rect->fill_pattern = ZnUnspecifiedImage;
  }
  if (rect->grad_geo) {
    ZnFree(rect->grad_geo);
  }
  ZnFreeGradient(rect->fill_color);
  ZnFreeGradient(rect->line_color);
}


/*
 **********************************************************************************
 *
 * Configure --
 *
 **********************************************************************************
 */
static int
Configure(Item		item,
	  int		argc,
	  Tcl_Obj *CONST argv[],
	  int		*flags)
{
  WidgetInfo	*wi = item->wi;
  RectangleItem	rect = (RectangleItem) item;
  int		status = ZN_OK;
  XColor	*color;
  int		alpha;
  
  status = ZnConfigureAttributes(wi, item, rect_attrs, argc, argv, flags);
  
  if (rect->gradient &&
      (ISSET(*flags, ZN_BORDER_FLAG) || (rect->relief == RELIEF_FLAT))) {
    ZnFreeGradient(rect->gradient);
    rect->gradient = NULL;
  }
  if ((rect->relief != RELIEF_FLAT) && !rect->gradient) {
    color = ZnGetGradientColor(rect->line_color, 51.0, &alpha);
    rect->gradient = ZnGetReliefGradient(wi->interp, wi->win,
					 ZnNameOfColor(color), alpha);
    if (rect->gradient == NULL) {
      status = ZN_ERROR;
    }
  }

  return status;
}


/*
 **********************************************************************************
 *
 * Query --
 *
 **********************************************************************************
 */
static int
Query(Item		item,
      int		argc,
      Tcl_Obj *CONST	argv[])
{
  if (ZnQueryAttribute(item->wi, item, rect_attrs, argv[0]) == ZN_ERROR) {
    return ZN_ERROR;
  }

  return ZN_OK;
}


/*
 **********************************************************************************
 *
 * ComputeCoordinates --
 *
 **********************************************************************************
 */
static void
ComputeCoordinates(Item		item,
		   ZnBool	force)
{
  WidgetInfo	*wi = item->wi;
  RectangleItem	rect = (RectangleItem) item;
  ZnPoint	p[4];
  int		i;
  ZnBool	aligned;
  ZnDim		delta;
  
  ResetBBox(&item->item_bounding_box);
  if (!rect->line_width && ISCLEAR(rect->flags, FILLED_BIT)) {
    return;
  }

  p[0] = rect->coords[0];
  p[2] = rect->coords[1];
  p[1].x = p[2].x;
  p[1].y = p[0].y;
  p[3].x = p[0].x;
  p[3].y = p[2].y;
  ZnTransformPoints(wi->current_transfo, p, rect->dev, 4);
  for (i = 0; i < 4; i++) {
    rect->dev[i].x = REAL_TO_INT(rect->dev[i].x);
    rect->dev[i].y = REAL_TO_INT(rect->dev[i].y);
  }

  /*
   * Add all points to the bounding box. Then expand by the line
   * width to account for mitered corners. This is an overestimate.
   */
  AddPointsToBBox(&item->item_bounding_box, rect->dev, 4);
  if (rect->line_width > 0) {
    item->item_bounding_box.orig.x -= rect->line_width;
    item->item_bounding_box.orig.y -= rect->line_width;
    item->item_bounding_box.corner.x += rect->line_width;
    item->item_bounding_box.corner.y += rect->line_width;
  }
  item->item_bounding_box.orig.x -= 1;
  item->item_bounding_box.orig.y -= 1;
  item->item_bounding_box.corner.x += 1;
  item->item_bounding_box.corner.y += 1;
  
  delta = rect->dev[0].y - rect->dev[1].y;
  delta = ABS(delta);
  aligned = delta < X_PRECISION_LIMIT;
  delta = rect->dev[0].x - rect->dev[1].x;
  delta = ABS(delta);
  aligned |= delta < X_PRECISION_LIMIT;
  ASSIGN(rect->flags, ALIGNED_BIT, aligned);

#ifdef GLX
  /*
   * If there is an axial gradient with an unaligned axis
   * compute the bbox in the coordinate system defined
   * by the gradient axis.
   */
  if (!ZnGradientFlat(rect->fill_color)) {
    ZnPoly	shape;

      if (rect->fill_color->type == ZN_AXIAL_GRADIENT) {
      int	angle = rect->fill_color->g.angle;

      if ((angle != 0) && (angle != 90) && (angle != 180) && (angle != 270)) {
	if (!rect->grad_geo) {
	  rect->grad_geo = ZnMalloc(6*sizeof(ZnPoint));
	}
	POLY_CONTOUR1(&shape, p, 4, False);
	ZnComputeAxialGradient(wi, &shape, angle, rect->grad_geo);
      }
      else {
	goto free_ggeo;
      }

    }
    else if (rect->fill_color->type == ZN_RADIAL_GRADIENT) {
      ZnPoint pp[4];
      if (!rect->grad_geo) {
	rect->grad_geo = ZnMalloc(6*sizeof(ZnPoint));
      }
      pp[0] = rect->coords[0];
      pp[2] = rect->coords[1];
      pp[1].x = pp[2].x;
      pp[1].y = pp[0].y;
      pp[3].x = pp[0].x;
      pp[3].y = pp[2].y;
      POLY_CONTOUR1(&shape, pp, 4, False);
      ZnComputeRadialGradient(wi, &shape, False, &rect->fill_color->g.p, rect->grad_geo);
    }
    else if (rect->fill_color->type == ZN_PATH_GRADIENT) {
      if (!rect->grad_geo) {
	rect->grad_geo = ZnMalloc(6*sizeof(ZnPoint));
      }
      POLY_CONTOUR1(&shape, rect->coords, 2, False);
      ZnComputePathGradient(wi, &shape, &rect->fill_color->g.p, rect->grad_geo);
    }
  }
  else {
  free_ggeo:
    if (rect->grad_geo) {
      ZnFree(rect->grad_geo);
      rect->grad_geo = NULL;
    }
  }
#endif
}


/*
 **********************************************************************************
 *
 * ToArea --
 *	Tell if the object is entirely outside (-1),
 *	entirely inside (1) or in between (0).
 *
 **********************************************************************************
 */
static int
ToArea(Item	item,
       ZnToArea	ta)
{
  RectangleItem	rect = (RectangleItem) item;
  int		result;
  ZnBBox	*area = ta->area;

  result = -1;
  
  if (ISSET(rect->flags, FILLED_BIT)) {
    result = PolygonInBBox(rect->dev, 4, area, NULL);
  }
  else if (rect->line_width > 0) {
    int		i;
    ZnPoint	pts[5];

    for (i = 0; i < 4; i++) {
      pts[i] = rect->dev[i];
    }
    pts[4] = pts[0];
    result = PolylineInBBox(pts, 5, rect->line_width,
			    CapProjecting, JoinMiter, area);
  }

  return result;
}


/*
 **********************************************************************************
 *
 * Draw --
 *
 **********************************************************************************
 */
static void
Draw(Item	item)
{
  WidgetInfo	*wi  = item->wi;
  RectangleItem	rect = (RectangleItem) item;
  XGCValues  	values;
  int		i, gc_mask;
  XRectangle	r;
  XPoint	xp[5];
  
  if (ISSET(rect->flags, ALIGNED_BIT)) {
    if (rect->dev[0].x < rect->dev[2].x) {
      r.x = rect->dev[0].x;
      r.width = rect->dev[2].x - r.x;
    }
    else {
      r.x = rect->dev[2].x;
      r.width = rect->dev[0].x - r.x;
    }
    if (rect->dev[0].y < rect->dev[2].y) {
      r.y = rect->dev[0].y;
      r.height = rect->dev[2].y - r.y;
    }
    else {
      r.y = rect->dev[2].y;
      r.height = rect->dev[0].y - r.y;
    }
  }
  else {
    for (i = 0; i < 4; i++) {
      xp[i].x = rect->dev[i].x;
      xp[i].y = rect->dev[i].y;
    }
    xp[i] = xp[0];
  }
  
  /*
   * Fill if requested.
   */
  if (ISSET(rect->flags, FILLED_BIT)) {
    values.foreground = ZnPixel(ZnGetGradientColor(rect->fill_color, 0.0, NULL));
    if (rect->tile != ZnUnspecifiedImage) { /* Fill tiled */
      values.fill_style = FillTiled;
      values.tile = ZnImagePixmap(rect->tile, NULL);
      if (ISSET(rect->flags, ALIGNED_BIT)) {
	values.ts_x_origin = (int) r.x;
	values.ts_y_origin = (int) r.y;
      }
      else {
	values.ts_x_origin = (int) item->item_bounding_box.orig.x;
	values.ts_y_origin = (int) item->item_bounding_box.orig.y;
      }
      XChangeGC(wi->dpy, wi->gc,
		  GCTileStipXOrigin|GCTileStipYOrigin|GCFillStyle|GCTile, &values);
    }
    else if (rect->fill_pattern != ZnUnspecifiedImage) { /* Fill stippled */
      values.fill_style = FillStippled;
      values.stipple = ZnImagePixmap(rect->fill_pattern, NULL);
      if (ISSET(rect->flags, ALIGNED_BIT)) {
	values.ts_x_origin = (int) r.x;
	values.ts_y_origin = (int) r.y;
	}
      else {
	values.ts_x_origin = (int) item->item_bounding_box.orig.x;
	values.ts_y_origin = (int) item->item_bounding_box.orig.y;
      }
      XChangeGC(wi->dpy, wi->gc,
		GCTileStipXOrigin|GCTileStipYOrigin|GCFillStyle|GCStipple|GCForeground,
		&values);
    }
    else { /* Fill solid */
      values.fill_style = FillSolid;
      XChangeGC(wi->dpy, wi->gc, GCForeground | GCFillStyle, &values);
    }
    if (ISSET(rect->flags, ALIGNED_BIT)) {
      XFillRectangle(wi->dpy, wi->draw_buffer, wi->gc, r.x, r.y,
		     r.width, r.height);
    }
    else {
      XFillPolygon(wi->dpy, wi->draw_buffer, wi->gc, xp, 4, Convex, CoordModeOrigin);
    }
  }

  /* Draw the outline */
  if (rect->line_width) {
    if (rect->relief != RELIEF_FLAT) {
      if (ISSET(rect->flags, ALIGNED_BIT)) {
 	ZnDrawRectangleRelief(wi, rect->relief, rect->gradient,
			      &r, rect->line_width);
      }
      else {
	ZnPoint p[5];
	for (i = 0; i < 4; i++) {
	  p[4-i].x = rect->dev[i].x;
	  p[4-i].y = rect->dev[i].y;
	}
	p[0] = p[4];
	ZnDrawPolygonRelief(wi, rect->relief, rect->gradient,
			    p, 5, rect->line_width);
      }
    }
    else {
      ZnSetLineStyle(wi, rect->line_style);
      gc_mask = GCFillStyle|GCLineWidth|GCForeground|GCJoinStyle;
      values.foreground = ZnPixel(ZnGetGradientColor(rect->line_color, 0, NULL));
      values.line_width = (rect->line_width == 1) ? 0 : rect->line_width;
      values.join_style = JoinMiter;
      if (ISCLEAR(rect->flags, ALIGNED_BIT)) {
	gc_mask |= GCCapStyle;
	values.cap_style = CapProjecting;
      }
      if (rect->line_pattern == ZnUnspecifiedImage) {
	values.fill_style = FillSolid;
	XChangeGC(wi->dpy, wi->gc, gc_mask, &values);
      }
      else {
	values.fill_style = FillStippled;
	values.stipple = ZnImagePixmap(rect->line_pattern, NULL);
	gc_mask |= GCStipple;
	XChangeGC(wi->dpy, wi->gc, gc_mask, &values);
      }
      if (ISSET(rect->flags, ALIGNED_BIT)) {
	XDrawRectangle(wi->dpy, wi->draw_buffer, wi->gc, r.x, r.y,
		       r.width, r.height);
      }
      else {
	XDrawLines(wi->dpy, wi->draw_buffer, wi->gc, xp, 5, CoordModeOrigin);
      }
    }
  }
}


/*
 **********************************************************************************
 *
 * Render --
 *
 **********************************************************************************
 */
#ifdef GLX
static void
RectRenderCB(void *closure)
{
  RectangleItem	rect = (RectangleItem) closure;

  glBegin(GL_TRIANGLE_STRIP);
  glVertex2f(rect->dev[0].x, rect->dev[0].y);
  glVertex2f(rect->dev[3].x, rect->dev[3].y);
  glVertex2f(rect->dev[1].x, rect->dev[1].y);
  glVertex2f(rect->dev[2].x, rect->dev[2].y);
  glEnd();
}
#endif

static void
Render(Item	item)
{
#ifdef GLX
  WidgetInfo	*wi  = item->wi;
  RectangleItem	rect = (RectangleItem) item;
  XColor	*color;
  int		i, alpha;
	
#ifdef GL_LIST
  if (!item->gl_list) {
    item->gl_list = glGenLists(1);
    glNewList(item->gl_list, GL_COMPILE);
#endif
    if (ISSET(rect->flags, FILLED_BIT)) {
      glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
      
      if (!ZnGradientFlat(rect->fill_color)) {
	ZnBool	fast = (rect->fill_color->type == ZN_AXIAL_GRADIENT) && !rect->grad_geo;
	ZnPoly	poly;
	
	POLY_CONTOUR1(&poly, rect->dev, 4, False);
	ZnRenderGradient(wi, rect->fill_color,
			 fast ? NULL: RectRenderCB, rect,
			 fast ? rect->dev : rect->grad_geo, &poly);
      }
      else {
	if (rect->tile != ZnUnspecifiedImage) { /* Fill tiled */
	  ZnRenderTile(wi, rect->tile, rect->fill_color, RectRenderCB,
		       rect, (ZnPoint *) &item->item_bounding_box);
	}
	else {
	  if (rect->fill_pattern != ZnUnspecifiedImage) { /* Fill stippled */
	    /*
	     * Setup polygon stippling.
	     */
	    glEnable(GL_POLYGON_STIPPLE);
	    glPolygonStipple(ZnImagePattern(rect->fill_pattern, NULL));
	  }
	  color = ZnGetGradientColor(rect->fill_color, 0.0, &alpha);
	  alpha = ZnComposeAlpha(alpha, wi->alpha);
	  glColor4us(color->red, color->green, color->blue, alpha);
	  RectRenderCB(rect);
	  glDisable(GL_POLYGON_STIPPLE);
	}
      }
    }
    
    if (rect->line_width) {
      ZnPoint p[5];
      for (i = 0; i < 4; i++) {
	p[4-i].x = rect->dev[i].x;
	p[4-i].y = rect->dev[i].y;
      }
      p[0] = p[4];
      if (rect->relief != RELIEF_FLAT) {
	ZnRenderPolygonRelief(wi, rect->relief, rect->gradient, False,
			      p, 5, rect->line_width);
      }
      else {
	ZnRenderPolyline(wi, p, 5, rect->line_width,
			 rect->line_style, CapRound, JoinMiter,
			 NULL, NULL, rect->line_color);
      }
    }
#ifdef GL_LIST    
    glEndList();
  }
  
  glCallList(item->gl_list);
#endif
#endif
}
  

/*
 **********************************************************************************
 *
 * IsSensitive --
 *
 **********************************************************************************
 */
static ZnBool
IsSensitive(Item	item,
	    int		item_part)
{
  return (ISSET(item->flags, SENSITIVE_BIT) &&
	  item->parent->class->IsSensitive(item->parent, ZN_NO_PART));
}


/*
 **********************************************************************************
 *
 * Pick --
 *
 **********************************************************************************
 */
static double
Pick(Item	item,
     ZnPick	ps)
{
  RectangleItem	rect = (RectangleItem) item;
  double	best_dist;
  ZnPoint	*p = ps->point;

  best_dist = PolygonToPointDist(rect->dev, 4, p);

  if (ISSET(rect->flags, FILLED_BIT)) {
    if (best_dist <= 0.0) {
      return 0.0;
    }
  }
  best_dist = ABS(best_dist);
  
  if (rect->line_width > 1) {
    double	dist;
    int		i;
    ZnPoint	pts[5];

    for (i = 0; i < 4; i++) {
      pts[i] = rect->dev[i];
    }
    pts[4] = pts[0];
    dist = PolylineToPointDist(pts, 5, rect->line_width,
			       CapProjecting, JoinMiter, p);
    if (dist <= 0.0) {
      return 0.0;
    }
    best_dist = MIN(dist, best_dist);
  }

  return best_dist;
}


/*
 **********************************************************************************
 *
 * PostScript --
 *
 **********************************************************************************
 */
static void
PostScript(Item			item,
	   PostScriptInfo	ps_info)
{
}


/*
 **********************************************************************************
 *
 * GetClipVertices --
 *	Get the clipping shape.
 *	Never ever call TRI_FREE on the tristrip returned by GetClipVertices.
 *
 **********************************************************************************
 */
static ZnBool
GetClipVertices(Item		item,
		ZnTriStrip	*tristrip)
{
  RectangleItem	rect = (RectangleItem) item;
  ZnPoint	*points;

  if (ISSET(rect->flags, ALIGNED_BIT)) {
    ZnListAssertSize(item->wi->work_pts, 2);
    points = (ZnPoint *) ZnListArray(item->wi->work_pts);
    TRI_STRIP1(tristrip, points, 2, False);
    tristrip->strips[0].fan = False;
  
    if (rect->dev[0].x < rect->dev[2].x) {
      points[0].x = rect->dev[0].x;
      points[1].x = rect->dev[2].x+1.0;
    }
    else {
      points[0].x = rect->dev[2].x;
      points[1].x = rect->dev[0].x+1.0;
    }
    if (rect->dev[0].y < rect->dev[2].y) {
      points[0].y = rect->dev[0].y;
      points[1].y = rect->dev[2].y+1.0;
    }
    else {
      points[0].y = rect->dev[2].y;
      points[1].y = rect->dev[0].y+1.0;
    }
  }
  else {
    TRI_STRIP1(tristrip, rect->dev, 4, False);
  }

  return ISSET(rect->flags, ALIGNED_BIT);
}


/*
 **********************************************************************************
 *
 * Coords --
 *	Return or edit the item vertices.
 *
 **********************************************************************************
 */
static int
Coords(Item	item,
       int	contour,
       int	index,
       int	cmd,
       ZnPoint	**pts,
       char	**controls,
       int	*num_pts)
{
  RectangleItem	rect = (RectangleItem) item;

  if ((cmd == COORDS_ADD) || (cmd == COORDS_ADD_LAST) || (cmd == COORDS_REMOVE)) {
    Tcl_AppendResult(item->wi->interp,
		     " rectangles can't add or remove vertices", NULL);
    return ZN_ERROR;
  }
  else if (cmd == COORDS_REPLACE_ALL) {
    if (*num_pts != 2) {
      Tcl_AppendResult(item->wi->interp,
		       " coords command need 2 points on rectangles", NULL);
      return ZN_ERROR;
    }
    rect->coords[0] = (*pts)[0];
    rect->coords[1] = (*pts)[1];
    ITEM.Invalidate(item, ZN_COORDS_FLAG);
  }
  else if (cmd == COORDS_REPLACE) {
    if (*num_pts < 1) {
      Tcl_AppendResult(item->wi->interp,
		       " coords command need at least 1 point", NULL);
      return ZN_ERROR;
    }
    if (index < 0) {
      index += 2;
    }
    if ((index < 0) || (index > 1)) {
    range_err:
      Tcl_AppendResult(item->wi->interp,
		       " incorrect coord index, should be between -2 and 1", NULL);
      return ZN_ERROR;
    }
    rect->coords[index] = (*pts)[0];
    ITEM.Invalidate(item, ZN_COORDS_FLAG);
  }
  else if (cmd == COORDS_READ_ALL) {
    *num_pts = 2;
    *pts = rect->coords;
  }
  else if (cmd == COORDS_READ) {
    if (index < 0) {
      index += 2;
    }
    if ((index < 0) || (index > 1)) {
      goto range_err;
    }
    *num_pts = 1;
    *pts = &rect->coords[index];
  }

  return ZN_OK;
}


/*
 **********************************************************************************
 *
 * GetAnchor --
 *
 **********************************************************************************
 */
static void
GetAnchor(Item		item,
	  ZnAnchor	anchor,
	  ZnPoint	*p)
{
  ZnBBox *bbox = &item->item_bounding_box;

  Origin2Anchor(&bbox->orig,
		bbox->corner.x - bbox->orig.x,
		bbox->corner.y - bbox->orig.y,
	        anchor, p);
}


/*
 **********************************************************************************
 *
 * Exported functions struct --
 *
 **********************************************************************************
 */
static ItemClassStruct RECTANGLE_ITEM_CLASS = {
  sizeof(RectangleItemStruct),
  0,			/* num_parts */
  False,		/* has_anchors */
  "rectangle",
  rect_attrs,
  Init,
  Clone,
  Destroy,
  Configure,
  Query,
  NULL,			/* GetFieldSet */
  GetAnchor,
  GetClipVertices,
  NULL,			/* GetContours */
  Coords,
  NULL,			/* InsertChars */
  NULL,			/* DeleteChars */
  NULL,			/* Cursor */
  NULL,			/* Index */
  NULL,			/* Part */
  NULL,			/* Selection */
  NULL,			/* Contour */
  ComputeCoordinates,
  ToArea,
  Draw,
  Render,
  IsSensitive,
  Pick,
  NULL,			/* PickVertex */
  PostScript
};

ZnItemClassId ZnRectangle = (ZnItemClassId) &RECTANGLE_ITEM_CLASS;