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/* $Id: gtkdatabox_bars.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <gtkdatabox_bars.h>
static void gtk_databox_bars_real_draw (GtkDataboxGraph * bars,
GtkDatabox* box);
struct _GtkDataboxBarsPrivate
{
GdkSegment *data;
};
static gpointer parent_class = NULL;
static void
bars_finalize (GObject * object)
{
GtkDataboxBars *bars = GTK_DATABOX_BARS (object);
g_free (bars->priv->data);
g_free (bars->priv);
/* Chain up to the parent class */
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gtk_databox_bars_class_init (gpointer g_class /*, gpointer g_class_data */ )
{
GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
GtkDataboxGraphClass *graph_class = GTK_DATABOX_GRAPH_CLASS (g_class);
GtkDataboxBarsClass *klass = GTK_DATABOX_BARS_CLASS (g_class);
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = bars_finalize;
graph_class->draw = gtk_databox_bars_real_draw;
}
static void
gtk_databox_bars_complete (GtkDataboxBars * bars)
{
bars->priv->data =
g_new0 (GdkSegment,
gtk_databox_xyc_graph_get_length
(GTK_DATABOX_XYC_GRAPH (bars)));
}
static void
gtk_databox_bars_instance_init (GTypeInstance * instance /*,
gpointer g_class */ )
{
GtkDataboxBars *bars = GTK_DATABOX_BARS (instance);
bars->priv = g_new0 (GtkDataboxBarsPrivate, 1);
g_signal_connect (bars, "notify::length",
G_CALLBACK (gtk_databox_bars_complete), NULL);
}
GType
gtk_databox_bars_get_type (void)
{
static GType type = 0;
if (type == 0)
{
static const GTypeInfo info = {
sizeof (GtkDataboxBarsClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gtk_databox_bars_class_init, /* class_init */
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GtkDataboxBars), /* instance_size */
0, /* n_preallocs */
(GInstanceInitFunc) gtk_databox_bars_instance_init, /* instance_init */
NULL, /* value_table */
};
type = g_type_register_static (GTK_DATABOX_TYPE_XYC_GRAPH,
"GtkDataboxBars", &info, 0);
}
return type;
}
/**
* gtk_databox_bars_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 #GtkDataboxBars object which can be added to a #GtkDatabox widget
*
* Return value: A new #GtkDataboxBars object
**/
GtkDataboxGraph *
gtk_databox_bars_new (guint len, gfloat * X, gfloat * Y,
GdkColor * color, guint size)
{
GtkDataboxBars *bars;
g_return_val_if_fail (X, NULL);
g_return_val_if_fail (Y, NULL);
g_return_val_if_fail ((len > 0), NULL);
bars = g_object_new (GTK_DATABOX_TYPE_BARS,
"X-Values", X,
"Y-Values", Y,
"length", len, "color", color, "size", size, NULL);
return GTK_DATABOX_GRAPH (bars);
}
static void
gtk_databox_bars_real_draw (GtkDataboxGraph * graph,
GtkDatabox* box)
{
GtkDataboxBars *bars = GTK_DATABOX_BARS (graph);
GdkSegment *data;
GdkGC *gc;
GdkPixmap *pixmap;
guint i = 0;
gfloat *X;
gfloat *Y;
guint len;
gint size = 0;
gint16 zero = 0;
g_return_if_fail (GTK_DATABOX_IS_BARS (bars));
g_return_if_fail (GTK_IS_DATABOX (box));
pixmap = gtk_databox_get_backing_pixmap (box);
if (gtk_databox_get_scale_type_y (box) == GTK_DATABOX_SCALE_LOG)
g_warning
("gtk_databox_bars do not work well with logarithmic scale in Y axis");
if (!(gc = gtk_databox_graph_get_gc(graph)))
gc = gtk_databox_graph_create_gc (graph, box);
len = gtk_databox_xyc_graph_get_length (GTK_DATABOX_XYC_GRAPH (graph));
X = gtk_databox_xyc_graph_get_X (GTK_DATABOX_XYC_GRAPH (graph));
Y = gtk_databox_xyc_graph_get_Y (GTK_DATABOX_XYC_GRAPH (graph));
size = gtk_databox_graph_get_size (graph);
data = bars->priv->data;
zero = gtk_databox_value_to_pixel_y (box, 0);
for (i = 0; i < len; i++, data++, X++, Y++)
{
data->x1 = data->x2 = gtk_databox_value_to_pixel_x (box, *X);
data->y1 = zero;
data->y2 = gtk_databox_value_to_pixel_y (box, *Y);
}
/* More than 2^16 bars will cause X IO error on most XServers
(Hint from Paul Barton-Davis) */
for (i = 0; i < len; i += 65536)
{
gdk_draw_segments (pixmap, gc,
bars->priv->data + i, MIN (65536, len - i));
}
return;
}
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