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/* -*- mode: c; c-basic-offset: 4; -*-
*
* iterative-map.h - The IterativeMap object builds on the ParameterHolder and
* HistogramRender objects to provide a rendering of a chaotic
* map into a histogram image.
*
* Fyre - rendering and interactive exploration of chaotic functions
* Copyright (C) 2004-2006 David Trowbridge and Micah Dowty
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* 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 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 "iterative-map.h"
#include <stdlib.h>
enum {
CALCULATION_FINISHED_SIGNAL,
CALCULATION_START_SIGNAL,
CALCULATION_STOP_SIGNAL,
LAST_SIGNAL,
};
static void iterative_map_class_init(IterativeMapClass *klass);
static void iterative_map_init(IterativeMap *self);
static int iterative_map_idle_handler(gpointer user_data);
static guint limit_iterations(guint iters);
static guint iterative_map_signals[LAST_SIGNAL] = { 0 };
/************************************************************************************/
/**************************************************** Initialization / Finalization */
/************************************************************************************/
GType iterative_map_get_type(void) {
static GType im_type = 0;
if (!im_type) {
static const GTypeInfo im_info = {
sizeof(IterativeMapClass),
NULL, /* base init */
NULL, /* base finalize */
(GClassInitFunc) iterative_map_class_init,
NULL, /* class finalize */
NULL, /* class data */
sizeof(IterativeMap),
0,
(GInstanceInitFunc) iterative_map_init,
};
im_type = g_type_register_static(HISTOGRAM_IMAGER_TYPE, "IterativeMap", &im_info, 0);
}
return im_type;
}
static void iterative_map_class_init(IterativeMapClass *klass) {
iterative_map_signals[CALCULATION_FINISHED_SIGNAL] =
g_signal_new("calculation-finished",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET(IterativeMapClass, iterative_map),
NULL,
NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
iterative_map_signals[CALCULATION_START_SIGNAL] =
g_signal_new("calculation-start",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET(IterativeMapClass, iterative_map),
NULL,
NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
iterative_map_signals[CALCULATION_STOP_SIGNAL] =
g_signal_new("calculation-stop",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET(IterativeMapClass, iterative_map),
NULL,
NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
static void iterative_map_init(IterativeMap *self) {
self->render_time = 0.015;
}
/************************************************************************************/
/********************************************************************** Calculation */
/************************************************************************************/
void iterative_map_calculate(IterativeMap *self, guint iterations) {
IterativeMapClass *class = ITERATIVE_MAP_CLASS(G_OBJECT_GET_CLASS(self));
class->calculate(self, iterations);
g_signal_emit(G_OBJECT(self), iterative_map_signals[CALCULATION_FINISHED_SIGNAL], 0);
}
void iterative_map_calculate_motion(IterativeMap *self,
guint iterations,
gboolean continuation,
ParameterInterpolator *interp,
gpointer interp_data) {
IterativeMapClass *class = ITERATIVE_MAP_CLASS(G_OBJECT_GET_CLASS(self));
class->calculate_motion(self, iterations, continuation, interp, interp_data);
g_signal_emit(G_OBJECT(self), iterative_map_signals[CALCULATION_FINISHED_SIGNAL], 0);
}
static guint limit_iterations(guint iters)
{
/* Put both upper and lower limits on the number of iters to run
* at once- if the iteration count is too low, our next speed estimate
* will be way off, and if it's too high we could have problems with
* memory allocated per-iteration.
*/
return MAX(MIN(iters, 10000000), 1000);
}
void iterative_map_calculate_timed(IterativeMap *self,
double seconds) {
GTimer *timer;
double elapsed;
guint iterations;
iterations = limit_iterations(self->iter_speed_estimate * seconds + 0.5);
timer = g_timer_new();
g_timer_start(timer);
iterative_map_calculate(self, iterations);
elapsed = g_timer_elapsed(timer, NULL);
g_timer_destroy(timer);
self->iter_speed_estimate = iterations / elapsed;
}
void iterative_map_calculate_motion_timed(IterativeMap *self,
double seconds,
gboolean continuation,
ParameterInterpolator *interp,
gpointer interp_data) {
GTimer *timer;
double elapsed;
guint iterations;
iterations = limit_iterations(self->iter_speed_estimate * seconds + 0.5);
timer = g_timer_new();
g_timer_start(timer);
iterative_map_calculate_motion(self, iterations, continuation, interp, interp_data);
elapsed = g_timer_elapsed(timer, NULL);
g_timer_destroy(timer);
self->iter_speed_estimate = iterations / elapsed;
}
static int iterative_map_idle_handler(gpointer user_data)
{
IterativeMap* self = ITERATIVE_MAP(user_data);
iterative_map_calculate_timed(self, self->render_time);
return 1;
}
void iterative_map_start_calculation (IterativeMap *self)
{
if (self->idle_handler)
return;
self->idle_handler = g_idle_add(iterative_map_idle_handler, self);
g_signal_emit(G_OBJECT(self), iterative_map_signals[CALCULATION_START_SIGNAL], 0);
}
void iterative_map_stop_calculation (IterativeMap *self)
{
if (!self->idle_handler)
return;
g_source_remove(self->idle_handler);
self->idle_handler = 0;
g_signal_emit(G_OBJECT(self), iterative_map_signals[CALCULATION_STOP_SIGNAL], 0);
}
gboolean iterative_map_is_calculation_running (IterativeMap *self)
{
return (self->idle_handler != 0);
}
/* The End */
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