661 lines
19 KiB
C
661 lines
19 KiB
C
/* -*- mode:C; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Tomas Frydrych <tf@openedhand.com>
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*
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* Copyright (C) 2007 OpenedHand
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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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:clutter-behaviour-ellipse
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* @short_description: elliptic path behaviour.
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*
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* #ClutterBehaviourEllipse interpolates actors along a path defined by
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* en ellipse.
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*
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* Each time the behaviour reaches a point on the path, the "knot-reached"
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* signal is emitted.
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*
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* Since: 0.4
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*/
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#include "clutter-fixed.h"
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#include "clutter-marshal.h"
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#include "clutter-behaviour-ellipse.h"
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#include "clutter-enum-types.h"
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#include "clutter-private.h"
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#include <stdlib.h>
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#include <memory.h>
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/****************************************************************************
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* *
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* ClutterBehaviourEllipse *
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* *
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****************************************************************************/
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G_DEFINE_TYPE (ClutterBehaviourEllipse,
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clutter_behaviour_ellipse,
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CLUTTER_TYPE_BEHAVIOUR);
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#define CLUTTER_BEHAVIOUR_ELLIPSE_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
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CLUTTER_TYPE_BEHAVIOUR_ELLIPSE, \
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ClutterBehaviourEllipsePrivate))
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enum
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{
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KNOT_REACHED,
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LAST_SIGNAL
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};
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static guint ellipse_signals[LAST_SIGNAL] = { 0, };
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enum
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{
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PROP_0,
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PROP_CENTER,
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PROP_WIDTH,
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PROP_HEIGHT,
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PROP_ANGLE_BEGIN,
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PROP_ANGLE_END,
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PROP_ANGLE_TILT,
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};
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struct _ClutterBehaviourEllipsePrivate
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{
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/*
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* Ellipse center
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*/
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ClutterKnot center;
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gint a;
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gint b;
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ClutterAngle angle_begin;
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ClutterAngle angle_end;
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ClutterAngle angle_tilt;
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};
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static void
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clutter_behaviour_ellipse_finalize (GObject *object)
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{
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G_OBJECT_CLASS (clutter_behaviour_ellipse_parent_class)->finalize (object);
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}
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static void
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clutter_behaviour_ellipse_advance (ClutterBehaviourEllipse * e,
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ClutterAngle angle,
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ClutterKnot * knot)
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{
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gint x = CFX_INT (e->priv->a * clutter_cosi (angle));
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gint y = CFX_INT (e->priv->b * clutter_sini (angle));
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if (e->priv->angle_tilt)
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{
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/* Problem: sqrti is not giving us sufficient precission here
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* and ClutterFixed range is too small to hold x^2+y^2 even for
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* reasonable x, y values.
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*
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* We take advantage of sqrt (a * b^2) == sqrt (a) * b,
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* and divide repeatedly by 4 until we get it into range, and then
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* multiply the result by 2 the same number of times.
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*/
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ClutterFixed r;
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guint q = x*x + y*y;
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gint shift = 0;
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while (q > G_MAXINT16)
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{
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++shift;
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q >>= 2;
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}
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r = clutter_sqrtx (CLUTTER_INT_TO_FIXED (q)) << shift;
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x = CFX_INT (CFX_MUL (r, clutter_cosi (angle + e->priv->angle_tilt)));
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y = CFX_INT (CFX_MUL (r, clutter_sini (angle + e->priv->angle_tilt)));
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}
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knot->x = x;
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knot->y = y;
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#if 0
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g_debug ("advancing to angle %d [%d, %d] (a: %d, b: %d)",
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angle, knot->x, knot->y, e->priv->a, e->priv->b);
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#endif
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}
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static void
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actor_apply_knot_foreach (ClutterBehaviour *behave,
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ClutterActor *actor,
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gpointer data)
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{
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ClutterKnot *knot = data;
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clutter_actor_set_position (actor, knot->x, knot->y);
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}
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static void
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clutter_behaviour_ellipse_alpha_notify (ClutterBehaviour * behave,
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guint32 alpha)
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{
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ClutterKnot knot;
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ClutterBehaviourEllipse * self = CLUTTER_BEHAVIOUR_ELLIPSE (behave);
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ClutterAngle angle;
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if (self->priv->angle_end >= self->priv->angle_begin)
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{
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angle = self->priv->angle_end - self->priv->angle_begin;
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angle =
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(angle * alpha) / CLUTTER_ALPHA_MAX_ALPHA + self->priv->angle_begin;
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}
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else
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{
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angle = self->priv->angle_begin - self->priv->angle_end;
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angle =
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self->priv->angle_begin - (angle * alpha) / CLUTTER_ALPHA_MAX_ALPHA;
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}
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clutter_behaviour_ellipse_advance (self, angle, &knot);
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knot.x += self->priv->center.x;
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knot.y += self->priv->center.y;
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clutter_behaviour_actors_foreach (behave,
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actor_apply_knot_foreach,
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&knot);
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g_signal_emit (behave, ellipse_signals[KNOT_REACHED], 0, &knot);
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}
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static void
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clutter_behaviour_ellipse_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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ClutterBehaviourEllipse * el = CLUTTER_BEHAVIOUR_ELLIPSE (gobject);
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ClutterBehaviourEllipsePrivate *priv;
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priv = CLUTTER_BEHAVIOUR_ELLIPSE (gobject)->priv;
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switch (prop_id)
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{
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case PROP_ANGLE_BEGIN:
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priv->angle_begin = g_value_get_int (value);
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break;
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case PROP_ANGLE_END:
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priv->angle_end = g_value_get_int (value);
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break;
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case PROP_ANGLE_TILT:
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priv->angle_tilt = g_value_get_int (value);
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break;
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case PROP_WIDTH:
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priv->a = g_value_get_int (value) >> 1;
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break;
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case PROP_HEIGHT:
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priv->b = g_value_get_int (value) >> 1;
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break;
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case PROP_CENTER:
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clutter_behaviour_ellipse_set_center (el, g_value_get_boxed (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_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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clutter_behaviour_ellipse_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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ClutterBehaviourEllipsePrivate *priv;
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priv = CLUTTER_BEHAVIOUR_ELLIPSE (gobject)->priv;
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switch (prop_id)
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{
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case PROP_ANGLE_BEGIN:
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g_value_set_int (value, priv->angle_begin);
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break;
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case PROP_ANGLE_END:
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g_value_set_int (value, priv->angle_end);
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break;
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case PROP_ANGLE_TILT:
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g_value_set_int (value, priv->angle_tilt);
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break;
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case PROP_WIDTH:
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g_value_set_int (value, 2 * priv->a);
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break;
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case PROP_HEIGHT:
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g_value_set_int (value, 2 * priv->b);
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break;
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case PROP_CENTER:
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g_value_set_boxed (value, &priv->center);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_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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clutter_behaviour_ellipse_class_init (ClutterBehaviourEllipseClass *klass)
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{
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GObjectClass * object_class = G_OBJECT_CLASS (klass);
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ClutterBehaviourClass * behave_class = CLUTTER_BEHAVIOUR_CLASS (klass);
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object_class->finalize = clutter_behaviour_ellipse_finalize;
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object_class->set_property = clutter_behaviour_ellipse_set_property;
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object_class->get_property = clutter_behaviour_ellipse_get_property;
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behave_class->alpha_notify = clutter_behaviour_ellipse_alpha_notify;
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/**
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* ClutterBehaviourEllipse:angle-begin:
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*
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* The initial angle from where the rotation should begin.
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*
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* Since: 0.4
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*/
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g_object_class_install_property (object_class,
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PROP_ANGLE_BEGIN,
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g_param_spec_int ("angle-begin",
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"Angle Begin",
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"Initial angle",
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0, G_MAXINT, 0,
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CLUTTER_PARAM_READWRITE));
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/**
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* ClutterBehaviourEllipse:angle-end:
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*
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* The final angle to where the rotation should end.
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*
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* Since: 0.4
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*/
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g_object_class_install_property (object_class,
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PROP_ANGLE_END,
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g_param_spec_int ("angle-end",
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"Angle End",
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"Final angle",
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0, G_MAXINT, 1024,
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CLUTTER_PARAM_READWRITE));
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/**
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* ClutterBehaviourEllipse:angle-end:
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*
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* The final angle to where the rotation should end.
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*
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* Since: 0.4
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*/
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g_object_class_install_property (object_class,
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PROP_ANGLE_TILT,
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g_param_spec_int ("angle-tilt",
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"Angle Tilt",
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"Tilt of the ellipse",
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0, G_MAXINT, 1024,
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CLUTTER_PARAM_READWRITE));
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/**
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* ClutterBehaviourEllipse:width:
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*
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* Width of the ellipse.
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*
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* Since: 0.4
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*/
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g_object_class_install_property (object_class,
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PROP_WIDTH,
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g_param_spec_int ("width",
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"Width",
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"Width of ellipse",
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0, G_MAXINT, 100,
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CLUTTER_PARAM_READWRITE));
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/**
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* ClutterBehaviourEllipse:height:
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*
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* Height of the ellipse.
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*
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* Since: 0.4
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*/
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g_object_class_install_property (object_class,
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PROP_HEIGHT,
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g_param_spec_int ("height",
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"Height",
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"Height of ellipse",
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0, G_MAXINT, 50,
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CLUTTER_PARAM_READWRITE));
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/**
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* ClutterBehaviourEllipse:center:
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*
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* The center of the ellipse.
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*
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* Since: 0.4
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*/
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g_object_class_install_property (object_class,
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PROP_CENTER,
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g_param_spec_boxed ("center",
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"Center",
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"Center of ellipse",
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CLUTTER_TYPE_KNOT,
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CLUTTER_PARAM_READWRITE));
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/**
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* ClutterBehaviourEllipse::knot-reached:
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* @ellipse: the object which received the signal
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* @knot: the #ClutterKnot reached
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*
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* This signal is emitted at the end of each frame.
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*
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* Since: 0.4
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*/
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ellipse_signals[KNOT_REACHED] =
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g_signal_new ("knot-reached",
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G_TYPE_FROM_CLASS (object_class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (ClutterBehaviourEllipseClass, knot_reached),
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NULL, NULL,
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clutter_marshal_VOID__BOXED,
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G_TYPE_NONE, 1,
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CLUTTER_TYPE_KNOT);
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g_type_class_add_private (klass, sizeof (ClutterBehaviourEllipsePrivate));
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}
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static void
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clutter_behaviour_ellipse_init (ClutterBehaviourEllipse * self)
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{
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ClutterBehaviourEllipsePrivate *priv;
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self->priv = priv = CLUTTER_BEHAVIOUR_ELLIPSE_GET_PRIVATE (self);
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}
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/**
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* clutter_behaviour_ellipse_new:
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* @alpha: a #ClutterAlpha, or %NULL
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* @center: center of the ellipse as #ClutterKnot
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* @width: width of the ellipse
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* @height: height of the ellipse
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* @begin: #ClutterAngle at which movement begins
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* @end: #ClutterAngle at which movement ends
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* @tilt: #ClutterAngle with which the ellipse should be tilted around its
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* center
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*
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* Creates a behaviour that drives actors along an elliptical path with
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* given center, width and height; the movement begins at angle_begin and
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* ends at angle_end; if angle_end > angle_begin, the movement is in
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* counter-clockwise direction, clockwise other wise.
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*
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* Return value: a #ClutterBehaviour
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*
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* Since: 0.4
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*/
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ClutterBehaviour *
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clutter_behaviour_ellipse_new (ClutterAlpha * alpha,
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ClutterKnot * center,
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gint width,
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gint height,
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ClutterAngle begin,
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ClutterAngle end,
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ClutterAngle tilt)
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{
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ClutterBehaviourEllipse *bc;
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g_return_val_if_fail (alpha == NULL || CLUTTER_IS_ALPHA (alpha), NULL);
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bc = g_object_new (CLUTTER_TYPE_BEHAVIOUR_ELLIPSE,
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"alpha", alpha,
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"center", center,
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"width", width,
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"height", height,
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"angle-begin", begin,
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"angle-end", end,
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"angle-tilt", tilt,
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NULL);
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return CLUTTER_BEHAVIOUR (bc);
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}
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/**
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* clutter_behaviour_ellipse_set_center
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* @self: a #ClutterBehaviourEllipse
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* @knot: a #ClutterKnot center for the ellipse
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*
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* Sets the center of the elliptical path to the point represented by knot.
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*
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* Since: 0.4
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*/
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void
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clutter_behaviour_ellipse_set_center (ClutterBehaviourEllipse * self,
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ClutterKnot * knot)
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{
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if (self->priv->center.x != knot->x || self->priv->center.y != knot->y)
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{
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g_object_ref (self);
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self->priv->center = *knot;
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g_object_notify (G_OBJECT (self), "center");
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g_object_unref (self);
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}
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}
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/**
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* clutter_behaviour_ellipse_get_center
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* @self: a #ClutterBehaviourEllipse
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* @knot: a #ClutterKnot where to store the center of the ellipse
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*
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* Gets the center of the elliptical path path.
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*
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* Since: 0.4
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*/
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void
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clutter_behaviour_ellipse_get_center (ClutterBehaviourEllipse * self,
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ClutterKnot * knot)
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{
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*knot = self->priv->center;
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}
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/**
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* clutter_behaviour_ellipse_set_width
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* @self: a #ClutterBehaviourEllipse
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* @width: width of the ellipse
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*
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* Sets the width of the elliptical path.
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*
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* Since: 0.4
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*/
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void
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clutter_behaviour_ellipse_set_width (ClutterBehaviourEllipse * self,
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gint width)
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{
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if (self->priv->a != width >> 1)
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{
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g_object_ref (self);
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self->priv->a = width >> 1;
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g_object_notify (G_OBJECT (self), "width");
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g_object_unref (self);
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}
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}
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/**
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* clutter_behaviour_ellipse_get_width
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* @self: a #ClutterBehaviourEllipse
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*
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* Gets the width of the elliptical path.
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*
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* Since: 0.4
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*/
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gint
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clutter_behaviour_ellipse_get_width (ClutterBehaviourEllipse * self)
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{
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return self->priv->a << 1;
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}
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/**
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* clutter_behaviour_ellipse_set_height
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* @self: a #ClutterBehaviourEllipse
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* @height: height of the ellipse
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*
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* Sets the height of the elliptical path.
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*
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* Since: 0.4
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*/
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void
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clutter_behaviour_ellipse_set_height (ClutterBehaviourEllipse * self,
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gint height)
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{
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if (self->priv->b != height >> 1)
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{
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g_object_ref (self);
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self->priv->b = height >> 1;
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g_object_notify (G_OBJECT (self), "height");
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g_object_unref (self);
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}
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}
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/**
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* clutter_behaviour_ellipse_get_height
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* @self: a #ClutterBehaviourEllipse
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*
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* Gets the height of the elliptical path.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
gint
|
|
clutter_behaviour_ellipse_get_height (ClutterBehaviourEllipse * self)
|
|
{
|
|
return self->priv->b << 1;
|
|
}
|
|
|
|
|
|
/**
|
|
* clutter_behaviour_ellipse_set_angle_begin
|
|
* @self: a #ClutterBehaviourEllipse
|
|
* @angle_begin: #ClutterAngle at which movement begins
|
|
*
|
|
* Sets the angle at which movement begins.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
void
|
|
clutter_behaviour_ellipse_set_angle_begin (ClutterBehaviourEllipse * self,
|
|
ClutterAngle angle_begin)
|
|
{
|
|
if (self->priv->angle_begin != angle_begin)
|
|
{
|
|
g_object_ref (self);
|
|
self->priv->angle_begin = angle_begin;
|
|
g_object_notify (G_OBJECT (self), "angle-begin");
|
|
g_object_unref (self);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* clutter_behaviour_ellipse_get_angle_begin
|
|
* @self: a #ClutterBehaviourEllipse
|
|
*
|
|
* Gets the at which movements begins.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
ClutterAngle
|
|
clutter_behaviour_ellipse_get_angle_begin (ClutterBehaviourEllipse * self)
|
|
{
|
|
return self->priv->angle_begin;
|
|
}
|
|
|
|
|
|
/**
|
|
* clutter_behaviour_ellipse_set_angle_end
|
|
* @self: a #ClutterBehaviourEllipse
|
|
* @angle_end: #ClutterAngle at which movement ends
|
|
*
|
|
* Sets the angle at which movement ends.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
void
|
|
clutter_behaviour_ellipse_set_angle_end (ClutterBehaviourEllipse * self,
|
|
ClutterAngle angle_end)
|
|
{
|
|
if (self->priv->angle_end != angle_end)
|
|
{
|
|
g_object_ref (self);
|
|
self->priv->angle_end = angle_end;
|
|
g_object_notify (G_OBJECT (self), "angle-end");
|
|
g_object_unref (self);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* clutter_behaviour_ellipse_get_angle_end
|
|
* @self: a #ClutterBehaviourEllipse
|
|
*
|
|
* Gets the at which movements ends.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
ClutterAngle
|
|
clutter_behaviour_ellipse_get_angle_end (ClutterBehaviourEllipse * self)
|
|
{
|
|
return self->priv->angle_end;
|
|
}
|
|
|
|
|
|
/**
|
|
* clutter_behaviour_ellipse_set_angle_tilt
|
|
* @self: a #ClutterBehaviourEllipse
|
|
* @angle_end: #ClutterAngle tilt of the elipse around the center
|
|
*
|
|
* Sets the angle at which the ellipse should be tilted around it's center.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
void
|
|
clutter_behaviour_ellipse_set_angle_tilt (ClutterBehaviourEllipse * self,
|
|
ClutterAngle angle_tilt)
|
|
{
|
|
if (self->priv->angle_tilt != angle_tilt)
|
|
{
|
|
g_object_ref (self);
|
|
self->priv->angle_tilt = angle_tilt;
|
|
g_object_notify (G_OBJECT (self), "angle-tilt");
|
|
g_object_unref (self);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* clutter_behaviour_ellipse_get_angle_tilt
|
|
* @self: a #ClutterBehaviourEllipse
|
|
*
|
|
* Gets the tilt of the ellipse around the center.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
ClutterAngle
|
|
clutter_behaviour_ellipse_get_angle_tilt (ClutterBehaviourEllipse * self)
|
|
{
|
|
return self->priv->angle_tilt;
|
|
}
|
|
|