174 lines
4.4 KiB
C
174 lines
4.4 KiB
C
/*
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* Copyright (c) 2014 Benjamin Otte <ottte@gnome.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "graphdata.h"
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enum {
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PROP_0,
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PROP_N_VALUES
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};
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struct _GtkGraphDataPrivate
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{
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guint n_values;
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guint offset;
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double *values;
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};
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G_DEFINE_TYPE_WITH_PRIVATE (GtkGraphData, gtk_graph_data, G_TYPE_OBJECT)
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static void
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gtk_graph_data_get_property (GObject *object,
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guint param_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkGraphData *graph = GTK_GRAPH_DATA (object);
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GtkGraphDataPrivate *priv = graph->priv;
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switch (param_id)
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{
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case PROP_N_VALUES:
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g_value_set_boolean (value, priv->n_values);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
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}
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}
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static void
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gtk_graph_data_finalize (GObject *object)
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{
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GtkGraphData *graph = GTK_GRAPH_DATA (object);
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GtkGraphDataPrivate *priv = graph->priv;
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g_free (priv->values);
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G_OBJECT_CLASS (gtk_graph_data_parent_class)->finalize (object);
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}
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static void
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gtk_graph_data_set_property (GObject *object,
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guint param_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkGraphData *graph = GTK_GRAPH_DATA (object);
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GtkGraphDataPrivate *priv = graph->priv;
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switch (param_id)
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{
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case PROP_N_VALUES:
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priv->n_values = g_value_get_uint (value);
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priv->values = g_new0 (double, priv->n_values);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
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}
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}
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static void
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gtk_graph_data_class_init (GtkGraphDataClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->finalize = gtk_graph_data_finalize;
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object_class->get_property = gtk_graph_data_get_property;
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object_class->set_property = gtk_graph_data_set_property;
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g_object_class_install_property (object_class,
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PROP_N_VALUES,
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g_param_spec_uint ("n-values",
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"n values",
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"Number of values in the graph",
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1, G_MAXUINT, 1,
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G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY));
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}
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static void
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gtk_graph_data_init (GtkGraphData *graph)
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{
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graph->priv = gtk_graph_data_get_instance_private (graph);
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}
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GtkGraphData *
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gtk_graph_data_new (guint n_values)
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{
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return g_object_new (GTK_TYPE_GRAPH_DATA,
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"n-values", n_values,
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NULL);
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}
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guint
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gtk_graph_data_get_n_values (GtkGraphData *data)
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{
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return data->priv->n_values;
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}
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double
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gtk_graph_data_get_value (GtkGraphData *data,
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guint i)
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{
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GtkGraphDataPrivate *priv = data->priv;
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return priv->values[(priv->offset + i) % priv->n_values];
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}
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double
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gtk_graph_data_get_minimum (GtkGraphData *data)
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{
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GtkGraphDataPrivate *priv = data->priv;
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double minimum = G_MAXDOUBLE;
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guint i;
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for (i = 0; i < priv->n_values; i++)
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{
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minimum = MIN (minimum, priv->values[i]);
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}
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return minimum;
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}
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double
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gtk_graph_data_get_maximum (GtkGraphData *data)
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{
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GtkGraphDataPrivate *priv = data->priv;
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double maximum = -G_MAXDOUBLE;
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guint i;
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for (i = 0; i < priv->n_values; i++)
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{
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maximum = MAX (maximum, priv->values[i]);
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}
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return maximum;
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}
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void
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gtk_graph_data_prepend_value (GtkGraphData *data,
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double value)
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{
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GtkGraphDataPrivate *priv = data->priv;
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priv->offset = (priv->offset + priv->n_values - 1) % priv->n_values;
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priv->values[priv->offset] = value;
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}
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