/* $Id: gtkdatabox_points.c 4 2008-06-22 09:19:11Z rbock $ */
/* GtkDatabox - An extension to the gtk+ library
 * Copyright (C) 1998 - 2008  Dr. Roland Bock
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <gtkdatabox_points.h>

static void gtk_databox_points_real_draw (GtkDataboxGraph * points,
					  GtkDatabox * box);
/**
 * GtkDataboxPointsPrivate
 *
 * A private data structure used by the #GtkDataboxPoints. It shields all internal things
 * from developers who are just using the object.
 *
 **/
typedef struct _GtkDataboxPointsPrivate GtkDataboxPointsPrivate;

struct _GtkDataboxPointsPrivate
{
   gint16 *xpixels;
   gint16 *ypixels;
   guint pixelsalloc;
};

G_DEFINE_TYPE_WITH_PRIVATE (GtkDataboxPoints, gtk_databox_points,
			    GTK_DATABOX_TYPE_XYC_GRAPH)

static void
points_finalize (GObject * object)
{
   GtkDataboxPoints *points = GTK_DATABOX_POINTS (object);
   GtkDataboxPointsPrivate *priv =
      gtk_databox_points_get_instance_private (points);

   g_free (priv->xpixels);
   g_free (priv->ypixels);

   /* Chain up to the parent class */
   G_OBJECT_CLASS (gtk_databox_points_parent_class)->finalize (object);
}

static void
gtk_databox_points_class_init (GtkDataboxPointsClass * klass)
{
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
   GtkDataboxGraphClass *graph_class = GTK_DATABOX_GRAPH_CLASS (klass);

   gobject_class->finalize = points_finalize;

   graph_class->draw = gtk_databox_points_real_draw;
}

static void
gtk_databox_points_complete (GtkDataboxPoints * points)
{
   GtkDataboxPointsPrivate *priv =
      gtk_databox_points_get_instance_private (points);

   priv->xpixels = NULL;
   priv->ypixels = NULL;
   priv->pixelsalloc = 0;
}

static void
gtk_databox_points_init (GtkDataboxPoints * points)
{
   g_signal_connect (points, "notify::length",
		     G_CALLBACK (gtk_databox_points_complete), NULL);
}

/**
 * gtk_databox_points_new:
 * @len: length of @X and @Y
 * @X: array of horizontal position values of markers
 * @Y: array of vertical position values of markers
 * @color: color of the markers
 * @size: marker size or line width (depending on the @type)
 *
 * Creates a new #GtkDataboxPoints object which can be added to a #GtkDatabox widget.
 *
 * Return value: A new #GtkDataboxPoints object
 **/
GtkDataboxGraph *
gtk_databox_points_new (guint len, gfloat * X, gfloat * Y,
			GdkRGBA * color, gint size)
{
   GtkDataboxPoints *points;
   g_return_val_if_fail (X, NULL);
   g_return_val_if_fail (Y, NULL);
   g_return_val_if_fail ((len > 0), NULL);

   points = g_object_new (GTK_DATABOX_TYPE_POINTS,
			  "X-Values", X,
			  "Y-Values", Y,
			  "xstart", 0,
			  "ystart", 0,
			  "xstride", 1,
			  "ystride", 1,
			  "xtype", G_TYPE_FLOAT,
			  "ytype", G_TYPE_FLOAT,
			  "length", len,
			  "maxlen", len, "color", color, "size", size, NULL);

   return GTK_DATABOX_GRAPH (points);
}

/**
 * gtk_databox_points_new_full:
 * @maxlen: maximum length of @X and @Y
 * @len: actual number of @X and @Y values to plot
 * @X: array of horizontal position values of markers
 * @Y: array of vertical position values of markers
 * @xstart: the first element in the X array to plot (usually 0)
 * @ystart: the first element in the Y array to plot (usually 0)
 * @xstride: successive elements in the X array are separated by this much (1 if array, ncols if matrix)
 * @ystride: successive elements in the Y array are separated by this much (1 if array, ncols if matrix)
 * @xtype: the GType of the X array elements.  G_TYPE_FLOAT, G_TYPE_DOUBLE, etc.
 * @ytype: the GType of the Y array elements.  G_TYPE_FLOAT, G_TYPE_DOUBLE, etc.
 * @color: color of the markers
 * @size: marker size or line width (depending on the @type)
 *
 * Creates a new #GtkDataboxPoints object which can be added to a #GtkDatabox widget.
 *
 * Return value: A new #GtkDataboxPoints object
 **/
GtkDataboxGraph *
gtk_databox_points_new_full (guint maxlen, guint len,
			     void *X, guint xstart, guint xstride,
			     GType xtype, void *Y, guint ystart,
			     guint ystride, GType ytype, GdkRGBA * color,
			     gint size)
{
   GtkDataboxPoints *points;
   g_return_val_if_fail (X, NULL);
   g_return_val_if_fail (Y, NULL);
   g_return_val_if_fail ((len > 0), NULL);

   points = g_object_new (GTK_DATABOX_TYPE_POINTS,
			  "X-Values", X,
			  "Y-Values", Y,
			  "xstart", xstart,
			  "ystart", ystart,
			  "xstride", xstride,
			  "ystride", ystride,
			  "xtype", xtype,
			  "ytype", ytype,
			  "length", len,
			  "maxlen", maxlen,
			  "color", color, "size", size, NULL);

   return GTK_DATABOX_GRAPH (points);
}

static void
gtk_databox_points_real_draw (GtkDataboxGraph * graph, GtkDatabox * box)
{
   GtkDataboxPoints *points = GTK_DATABOX_POINTS (graph);
   GtkDataboxPointsPrivate *priv =
      gtk_databox_points_get_instance_private (points);
   guint i = 0;
   void *X;
   void *Y;
   guint len, maxlen;
   gint pointsize = 0;
   cairo_t *cr;
   gint16 *xpixels, *ypixels;
   guint xstart, xstride, ystart, ystride;
   GType xtype, ytype;

   g_return_if_fail (GTK_DATABOX_IS_POINTS (points));
   g_return_if_fail (GTK_IS_DATABOX (box));

   cr = gtk_databox_graph_create_gc (graph, box);

   len = gtk_databox_xyc_graph_get_length (GTK_DATABOX_XYC_GRAPH (graph));
   maxlen = gtk_databox_xyc_graph_get_maxlen (GTK_DATABOX_XYC_GRAPH (graph));

   if (priv->pixelsalloc < len)
   {
      priv->pixelsalloc = len;
      priv->xpixels =
	 (gint16 *) g_realloc (priv->xpixels, len * sizeof (gint16));
      priv->ypixels =
	 (gint16 *) g_realloc (priv->ypixels, len * sizeof (gint16));
   }

   xpixels = priv->xpixels;
   ypixels = priv->ypixels;

   X = gtk_databox_xyc_graph_get_X (GTK_DATABOX_XYC_GRAPH (graph));
   xstart = gtk_databox_xyc_graph_get_xstart (GTK_DATABOX_XYC_GRAPH (graph));
   xstride =
      gtk_databox_xyc_graph_get_xstride (GTK_DATABOX_XYC_GRAPH (graph));
   xtype = gtk_databox_xyc_graph_get_xtype (GTK_DATABOX_XYC_GRAPH (graph));
   gtk_databox_values_to_xpixels (box, xpixels, X, xtype, maxlen, xstart,
				  xstride, len);

   Y = gtk_databox_xyc_graph_get_Y (GTK_DATABOX_XYC_GRAPH (graph));
   ystart = gtk_databox_xyc_graph_get_ystart (GTK_DATABOX_XYC_GRAPH (graph));
   ystride =
      gtk_databox_xyc_graph_get_ystride (GTK_DATABOX_XYC_GRAPH (graph));
   ytype = gtk_databox_xyc_graph_get_ytype (GTK_DATABOX_XYC_GRAPH (graph));
   gtk_databox_values_to_ypixels (box, ypixels, Y, ytype, maxlen, ystart,
				  ystride, len);

   pointsize = gtk_databox_graph_get_size (graph);

   for (i = 0; i < len; i++, xpixels++, ypixels++)
      cairo_rectangle (cr, *xpixels - pointsize / 2, *ypixels - pointsize / 2,
		       pointsize, pointsize);

   cairo_fill (cr);
   cairo_destroy (cr);
   return;
}