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/* $Id: gtkdatabox_graph.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_graph.h>
#include <gtk/gtk.h>
static void gtk_databox_graph_real_draw (GtkDataboxGraph * graph,
GtkDatabox * draw);
static gint gtk_databox_graph_real_calculate_extrema (GtkDataboxGraph * graph,
gfloat * min_x,
gfloat * max_x,
gfloat * min_y,
gfloat * max_y);
/* IDs of properties */
enum
{
GRAPH_COLOR = 1,
GRAPH_SIZE,
GRAPH_HIDE,
GRAPH_RGBA
};
struct _GtkDataboxGraphPrivate
{
GdkColor color;
gint size;
gboolean hide;
GdkRGBA rgba;
};
static gpointer parent_class = NULL;
static void
gtk_databox_graph_set_property (GObject * object,
guint property_id,
const GValue * value, GParamSpec * pspec)
{
GtkDataboxGraph *graph = GTK_DATABOX_GRAPH (object);
switch (property_id)
{
case GRAPH_COLOR:
{
gtk_databox_graph_set_color (graph,
(GdkColor *)
g_value_get_pointer (value));
}
break;
case GRAPH_SIZE:
{
gtk_databox_graph_set_size (graph, g_value_get_int (value));
}
break;
case GRAPH_HIDE:
{
gtk_databox_graph_set_hide (graph, g_value_get_boolean (value));
}
break;
case GRAPH_RGBA:
{
gtk_databox_graph_set_rgba (graph,
(GdkRGBA *)
g_value_get_pointer (value));
}
break;
default:
/* We don't have any other property... */
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gtk_databox_graph_get_property (GObject * object,
guint property_id,
GValue * value, GParamSpec * pspec)
{
GtkDataboxGraph *graph = GTK_DATABOX_GRAPH (object);
switch (property_id)
{
case GRAPH_COLOR:
{
g_value_set_pointer (value, gtk_databox_graph_get_color (graph));
}
break;
case GRAPH_SIZE:
{
g_value_set_int (value, gtk_databox_graph_get_size (graph));
}
break;
case GRAPH_HIDE:
{
g_value_set_boolean (value, gtk_databox_graph_get_hide (graph));
}
break;
case GRAPH_RGBA:
{
g_value_set_pointer (value, gtk_databox_graph_get_rgba (graph));
}
break;
default:
/* We don't have any other property... */
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
/**
* gtk_databox_graph_create_gc:
* @graph: A #GtkDataboxGraph object
* @box: A #GtkDatabox object
*
* Virtual function which creates a graphics context for the @graph.
*
* Typically called by derived graph objects when the graphics context is needed for the first time.
*
* Return value: The new graphics context.
*/
cairo_t*
gtk_databox_graph_create_gc (GtkDataboxGraph * graph,
GtkDatabox* box)
{
return GTK_DATABOX_GRAPH_GET_CLASS (graph)->create_gc (graph, box);
}
static cairo_t *
gtk_databox_graph_real_create_gc (GtkDataboxGraph * graph,
GtkDatabox* box)
{
cairo_t *cr;
g_return_val_if_fail (GTK_DATABOX_IS_GRAPH (graph), NULL);
cr = cairo_create (gtk_databox_get_backing_surface (box));
gdk_cairo_set_source_color (cr, &graph->priv->color);
cairo_set_line_width (cr, (graph->priv->size > 1) ? graph->priv->size : 1);
return cr;
}
static void
graph_finalize (GObject * object)
{
GtkDataboxGraph *graph = GTK_DATABOX_GRAPH (object);
g_free (graph->priv);
/* Chain up to the parent class */
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gtk_databox_graph_class_init (gpointer g_class /*, gpointer g_class_data */ )
{
GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
GtkDataboxGraphClass *klass = GTK_DATABOX_GRAPH_CLASS (g_class);
GParamSpec *graph_param_spec;
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = gtk_databox_graph_set_property;
gobject_class->get_property = gtk_databox_graph_get_property;
gobject_class->finalize = graph_finalize;
graph_param_spec = g_param_spec_pointer ("color",
"Graph color",
"Color of graph",
G_PARAM_READWRITE);
g_object_class_install_property (gobject_class,
GRAPH_COLOR, graph_param_spec);
graph_param_spec = g_param_spec_int ("size", "Graph size", "Size of displayed items", G_MININT, G_MAXINT, 0, /* default value */
G_PARAM_READWRITE);
g_object_class_install_property (gobject_class,
GRAPH_SIZE, graph_param_spec);
graph_param_spec = g_param_spec_boolean ("hide", "Graph hidden", "Determine if graph is hidden or not", FALSE, /* default value */
G_PARAM_READWRITE);
g_object_class_install_property (gobject_class,
GRAPH_HIDE, graph_param_spec);
klass->draw = gtk_databox_graph_real_draw;
klass->calculate_extrema = gtk_databox_graph_real_calculate_extrema;
klass->create_gc = gtk_databox_graph_real_create_gc;
}
static void
gtk_databox_graph_instance_init (GTypeInstance * instance
/*, gpointer g_class */ )
{
GtkDataboxGraph *graph = GTK_DATABOX_GRAPH (instance);
graph->priv = g_new0 (GtkDataboxGraphPrivate, 1);
}
GType
gtk_databox_graph_get_type (void)
{
static GType type = 0;
if (type == 0)
{
static const GTypeInfo info =
{
sizeof (GtkDataboxGraphClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gtk_databox_graph_class_init, /* class_init */
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GtkDataboxGraph), /* instance_size */
0, /* n_preallocs */
(GInstanceInitFunc) gtk_databox_graph_instance_init, /* instance_init */
NULL, /* value_table */
};
type = g_type_register_static (G_TYPE_OBJECT,
"GtkDataboxGraph", &info, 0);
}
return type;
}
/**
* gtk_databox_graph_draw:
* @graph: A #GtkDataboxGraph object
* @box: A #GtkDatabox object
*
* Virtual function which draws the #GtkDataboxGraph on the drawing area of the GtkDatabox object.
*
* Typically this function is called by #GtkDatabox objects.
*
*/
void
gtk_databox_graph_draw (GtkDataboxGraph * graph, GtkDatabox* box)
{
if (!graph->priv->hide)
GTK_DATABOX_GRAPH_GET_CLASS (graph)->draw (graph, box);
}
/**
* gtk_databox_graph_calculate_extrema:
* @graph: A #GtkDataboxGraph object
* @min_x: Will be filled with the lowest x value of the dataset
* @max_x: Will be filled with the highest x value of the dataset
* @min_y: Will be filled with the lowest y value of the dataset
* @max_y: Will be filled with the highest y value of the dataset
*
* Virtual function which determines the minimum and maximum x and y values of the values of this
* #GtkDataboxGraph object if applicable (there are graphs which do
* not contain data).
*
* Return value: 0 on success,
* -1 if no data is available,
*
*/
gint
gtk_databox_graph_calculate_extrema (GtkDataboxGraph * graph,
gfloat * min_x, gfloat * max_x,
gfloat * min_y, gfloat * max_y)
{
return
GTK_DATABOX_GRAPH_GET_CLASS (graph)->calculate_extrema (graph, min_x,
max_x, min_y,
max_y);
}
static void
gtk_databox_graph_real_draw (GtkDataboxGraph * graph,
GtkDatabox* box)
{
g_return_if_fail (graph);
g_return_if_fail (box);
/* We have no data... */
return;
}
static gint
gtk_databox_graph_real_calculate_extrema (GtkDataboxGraph * graph,
gfloat * min_x, gfloat * max_x,
gfloat * min_y, gfloat * max_y)
{
g_return_val_if_fail (graph, -1);
g_return_val_if_fail (min_x, -1);
g_return_val_if_fail (max_x, -1);
g_return_val_if_fail (min_y, -1);
g_return_val_if_fail (max_y, -1);
/* We have no data... */
return -1;
}
/**
* gtk_databox_graph_set_color:
* @graph: A #GtkDataboxGraph object
* @color: Color which is to be used by the graph object
*
* Sets the color which the #GtkDataboxGraph object is supposed to be using when drawing itself.
*
*/
void
gtk_databox_graph_set_color (GtkDataboxGraph * graph, GdkColor * color)
{
g_return_if_fail (GTK_DATABOX_IS_GRAPH (graph));
graph->priv->color = *color;
graph->priv->rgba.red = color->red / 65535.0;
graph->priv->rgba.blue = color->blue / 65535.0;
graph->priv->rgba.green = color->green / 65535.0;
graph->priv->rgba.alpha = 1.0;
g_object_notify (G_OBJECT (graph), "color");
}
/**
* gtk_databox_graph_get_color:
* @graph: A #GtkDataboxGraph object
*
* Gets the current color of the graph elements (e.g. points).
*
* Return value: The color of the graph.
*
*/
GdkColor *
gtk_databox_graph_get_color (GtkDataboxGraph * graph)
{
return &graph->priv->color;
}
/**
* gtk_databox_graph_set_rgba:
* @graph: A #GtkDataboxGraph object
* @rgba: Color which is to be used by the graph object
*
* Sets the color which the #GtkDataboxGraph object is supposed to be using when drawing itself.
*
*/
void
gtk_databox_graph_set_rgba (GtkDataboxGraph * graph, GdkRGBA * rgba)
{
g_return_if_fail (GTK_DATABOX_IS_GRAPH (graph));
graph->priv->rgba = *rgba;
graph->priv->color.red = rgba->red * 65535.0;
graph->priv->color.blue = rgba->blue * 65535.0;
graph->priv->color.green = rgba->green * 65535.0;
g_object_notify (G_OBJECT (graph), "color");
}
/**
* gtk_databox_graph_get_rgba:
* @graph: A #GtkDataboxGraph object
*
* Gets the current color of the graph elements (e.g. points).
*
* Return value: The color of the graph (as GdkRGBA).
*
*/
GdkRGBA *
gtk_databox_graph_get_rgba (GtkDataboxGraph * graph)
{
return &graph->priv->rgba;
}
/**
* gtk_databox_graph_set_size:
* @graph: A #GtkDataboxGraph object
* @size: Size of graph elements for the graph object
*
* Sets the size (e.g. line width) which the #GtkDataboxGraph object is supposed to be using when drawing itself.
*
*/
void
gtk_databox_graph_set_size (GtkDataboxGraph * graph, gint size)
{
g_return_if_fail (GTK_DATABOX_IS_GRAPH (graph));
graph->priv->size = MAX (1, size);;
g_object_notify (G_OBJECT (graph), "size");
}
/**
* gtk_databox_graph_get_size:
* @graph: A #GtkDataboxGraph object
*
* Gets the size of the graph elements (e.g. the line width).
*
* Return value: size of the graph elements
*
*/
gint
gtk_databox_graph_get_size (GtkDataboxGraph * graph)
{
g_return_val_if_fail (GTK_DATABOX_IS_GRAPH (graph), -1);
return graph->priv->size;
}
/**
* gtk_databox_graph_set_hide:
* @graph: A #GtkDataboxGraph object
* @hide: Declares whether should be hidden (true) or not (false).
*
* Hidden graphs are not shown, when the #GtkDatabox containing them is redrawn.
*
*/
void
gtk_databox_graph_set_hide (GtkDataboxGraph * graph, gboolean hide)
{
g_return_if_fail (GTK_DATABOX_IS_GRAPH (graph));
graph->priv->hide = hide;
g_object_notify (G_OBJECT (graph), "hide");
}
/**
* gtk_databox_graph_get_hide:
* @graph: A #GtkDataboxGraph object
*
* Gets the current "hide" status.
*
* Return value: Whether the graph is hidden (true) or not (false).
*
*/
gboolean
gtk_databox_graph_get_hide (GtkDataboxGraph * graph)
{
g_return_val_if_fail (GTK_DATABOX_IS_GRAPH (graph), -1);
return graph->priv->hide;
}