348 lines
8.6 KiB
C
348 lines
8.6 KiB
C
/* blib - Library of useful things to hack the Blinkenlights
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*
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* Copyright (c) 2002 The Blinkenlights Crew
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* Sven Neumann <sven@gimp.org>
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*
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* Inspired by the Qix hack from the xscreensaver package.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <gmodule.h>
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#include <blib/blib.h>
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#define TIMEOUT 60
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#define SPREAD 100 /* prescaled! */
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#define SCALE 6
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#define B_TYPE_QIX (b_type_qix)
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#define B_QIX(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), B_TYPE_QIX, BQix))
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#define B_QIX_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), B_TYPE_QIX, BQixClass))
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#define B_IS_QIX(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), B_TYPE_QIX))
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typedef struct _BQix BQix;
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typedef struct _BQixClass BQixClass;
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typedef struct _BQixLine BQixLine;
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struct _BQixLine
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{
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struct {
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gint x;
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gint y;
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gint dx;
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gint dy;
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} points[2];
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};
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struct _BQix
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{
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BModule parent_instance;
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gint max_lines;
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BQixLine *lines;
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guchar *values;
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gint nlines;
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gint maxx;
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gint maxy;
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};
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struct _BQixClass
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{
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BModuleClass parent_class;
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};
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enum
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{
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PROP_0,
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PROP_LINES
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};
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static GType b_qix_get_type (GTypeModule *module);
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static void b_qix_class_init (BQixClass *klass);
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static void b_qix_finalize (GObject *object);
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static void b_qix_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static void b_qix_init (BQix *qix);
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static gboolean b_qix_query (gint width,
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gint height,
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gint channels,
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gint maxval);
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static gboolean b_qix_prepare (BModule *module,
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GError **error);
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static void b_qix_relax (BModule *module);
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static void b_qix_start (BModule *module);
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static gint b_qix_tick (BModule *module);
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static void b_qix_describe (BModule *module,
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const gchar **title,
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const gchar **description,
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const gchar **author);
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static BModuleClass * parent_class = NULL;
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static GType b_type_qix = 0;
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G_MODULE_EXPORT gboolean
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b_module_register (GTypeModule *module)
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{
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b_qix_get_type (module);
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return TRUE;
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}
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GType
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b_qix_get_type (GTypeModule *module)
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{
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if (!b_type_qix)
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{
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static const GTypeInfo qix_info =
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{
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sizeof (BQixClass),
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NULL, /* base_init */
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NULL, /* base_finalize */
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(GClassInitFunc) b_qix_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (BQix),
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0, /* n_preallocs */
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(GInstanceInitFunc) b_qix_init,
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};
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b_type_qix = g_type_module_register_type (module,
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B_TYPE_MODULE, "BQix",
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&qix_info, 0);
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}
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return b_type_qix;
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}
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static void
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b_qix_class_init (BQixClass *klass)
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{
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GObjectClass *object_class;
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BModuleClass *module_class;
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GParamSpec *param_spec;
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object_class = G_OBJECT_CLASS (klass);
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module_class = B_MODULE_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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object_class->finalize = b_qix_finalize;
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object_class->set_property = b_qix_set_property;
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param_spec = g_param_spec_int ("lines", NULL,
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"The number of lines to draw.",
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1, 64, 5,
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G_PARAM_CONSTRUCT | G_PARAM_WRITABLE);
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g_object_class_install_property (object_class, PROP_LINES, param_spec);
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module_class->query = b_qix_query;
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module_class->prepare = b_qix_prepare;
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module_class->relax = b_qix_relax;
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module_class->start = b_qix_start;
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module_class->tick = b_qix_tick;
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module_class->describe = b_qix_describe;
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}
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static void
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b_qix_finalize (GObject *object)
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{
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BQix *qix = B_QIX (object);
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g_free (qix->lines);
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g_free (qix->values);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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b_qix_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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BQix *qix = B_QIX (object);
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switch (property_id)
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{
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case PROP_LINES:
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g_return_if_fail (g_value_get_int (value) > 0);
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qix->max_lines = g_value_get_int (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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b_qix_init (BQix *qix)
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{
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}
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static gboolean
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b_qix_query (gint width,
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gint height,
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gint channels,
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gint maxval)
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{
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return (width > 0 && height > 0 && channels == 1 && maxval > 0);
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}
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static gboolean
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b_qix_prepare (BModule *module,
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GError **error)
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{
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BQix *qix = B_QIX (module);
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gint i, value;
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gint xspread, yspread;
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if (qix->max_lines < 1)
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{
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g_set_error (error, 0, 0, "Qix module must have at least one line");
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return FALSE;
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}
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qix->lines = g_new (BQixLine, 2 * qix->max_lines);
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qix->values = g_new (guchar, qix->max_lines);
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if (module->aspect < 1.0)
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{
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xspread = SPREAD;
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yspread = module->aspect * xspread;
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}
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else
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{
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yspread = SPREAD;
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xspread = module->aspect * yspread;
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}
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qix->maxx = (module->width << SCALE) - 1;
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qix->maxy = (module->height << SCALE) - 1;
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qix->nlines = 1;
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for (i = 0; i < 2; i++)
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{
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qix->lines[0].points[i].x = rand () % qix->maxx;
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qix->lines[0].points[i].y = rand () % qix->maxy;
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qix->lines[0].points[i].dx = (rand () % (xspread + 1)) - (xspread / 2);
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qix->lines[0].points[i].dy = (rand () % (yspread + 1)) - (yspread / 2);
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}
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value = module->maxval / qix->max_lines;
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for (i = 0; i < qix->max_lines; i++)
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qix->values[i] = module->maxval - i * value;
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return TRUE;
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}
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static void
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b_qix_relax (BModule *module)
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{
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BQix *qix = B_QIX (module);
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if (qix->lines)
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{
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g_free (qix->lines);
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qix->lines = NULL;
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}
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if (qix->values)
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{
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g_free (qix->values);
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qix->values = NULL;
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}
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}
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static void
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b_qix_start (BModule *module)
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{
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b_module_ticker_start (module, TIMEOUT);
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}
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static gint
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b_qix_tick (BModule *module)
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{
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BQix *qix = B_QIX (module);
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BQixLine *line;
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gint i;
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b_module_fill (module, 0);
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#define wiggle(point, delta, max) \
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point += delta; \
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if (point < 0) point = 0, delta = -delta, point += delta / 2; \
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else if (point > max) point = max, delta = -delta, point += delta / 2;
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for (i = qix->nlines - 1; i > 0; i--)
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memcpy (qix->lines + i, qix->lines + i - 1, sizeof (BQixLine));
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line = qix->lines;
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for (i = 0; i < 2; i++)
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{
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wiggle (line->points[i].x, line->points[i].dx, qix->maxx);
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wiggle (line->points[i].y, line->points[i].dy, qix->maxy);
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}
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i = qix->nlines - 1;
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if (i % 2)
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i--;
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for (; i >= 0; i -= 2)
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{
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line = qix->lines + i;
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b_module_draw_line (module,
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line->points[0].x >> SCALE,
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line->points[0].y >> SCALE,
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line->points[1].x >> SCALE,
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line->points[1].y >> SCALE,
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qix->values[i / 2]);
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}
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b_module_paint (module);
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if (qix->nlines < 2 * qix->max_lines)
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qix->nlines++;
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return TIMEOUT;
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}
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static void
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b_qix_describe (BModule *module,
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const gchar **title,
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const gchar **description,
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const gchar **author)
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{
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*title = "BQix";
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*description = "Qix hack";
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*author = "Sven Neumann";
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}
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