mirror of
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0c576c0c33
Finish off the second half of 09a830d294.
http://bugzilla.clutter-project.org/show_bug.cgi?id=2596
425 lines
12 KiB
C
425 lines
12 KiB
C
/*
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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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* Copyright (C) 2010 Intel Corporation.
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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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* Author:
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* Emmanuele Bassi <ebassi@linux.intel.com>
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*
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* Based on MxDeformPageTurn, written by:
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* Chris Lord <chris@linux.intel.com>
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*/
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/**
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* SECTION:clutter-page-turn-effect
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* @Title: ClutterPageTurnEffect
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* @Short_Description: A page turning effect
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*
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* A simple page turning effect
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*
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* #ClutterPageTurnEffect is available since Clutter 1.4
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <math.h>
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#include "clutter-page-turn-effect.h"
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#include "clutter-debug.h"
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#include "clutter-private.h"
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#define CLUTTER_PAGE_TURN_EFFECT_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), CLUTTER_TYPE_PAGE_TURN_EFFECT, ClutterPageTurnEffectClass))
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#define CLUTTER_IS_PAGE_TURN_EFFECT_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), CLUTTER_TYPE_PAGE_TURN_EFFECT))
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#define CLUTTER_PAGE_TURN_EFFECT_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), CLUTTER_TYPE_PAGE_TURN_EFFECT, ClutterPageTurnEffectClass))
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struct _ClutterPageTurnEffect
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{
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ClutterDeformEffect parent_instance;
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gdouble period;
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gdouble angle;
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gfloat radius;
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};
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struct _ClutterPageTurnEffectClass
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{
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ClutterDeformEffectClass 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_PERIOD,
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PROP_ANGLE,
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PROP_RADIUS,
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PROP_LAST
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};
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static GParamSpec *obj_props[PROP_LAST];
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G_DEFINE_TYPE (ClutterPageTurnEffect,
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clutter_page_turn_effect,
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CLUTTER_TYPE_DEFORM_EFFECT);
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static void
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clutter_page_turn_effect_deform_vertex (ClutterDeformEffect *effect,
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gfloat width,
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gfloat height,
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CoglTextureVertex *vertex)
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{
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ClutterPageTurnEffect *self = CLUTTER_PAGE_TURN_EFFECT (effect);
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gfloat cx, cy, rx, ry, radians, turn_angle;
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guint shade;
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if (self->period == 0.0)
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return;
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radians = self->angle / (180.0f / G_PI);
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/* Rotate the point around the centre of the page-curl ray to align it with
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* the y-axis.
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*/
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cx = (1.f - self->period) * width;
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cy = (1.f - self->period) * height;
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rx = ((vertex->x - cx) * cos (- radians))
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- ((vertex->y - cy) * sin (- radians))
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- self->radius;
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ry = ((vertex->x - cx) * sin (- radians))
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+ ((vertex->y - cy) * cos (- radians));
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turn_angle = 0.f;
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if (rx > self->radius * -2.0f)
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{
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/* Calculate the curl angle as a function from the distance of the curl
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* ray (i.e. the page crease)
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*/
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turn_angle = (rx / self->radius * G_PI_2) - G_PI_2;
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shade = (sin (turn_angle) * 96.0f) + 159.0f;
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/* Add a gradient that makes it look like lighting and hides the switch
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* between textures.
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*/
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cogl_color_init_from_4ub (&vertex->color, shade, shade, shade, 0xff);
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}
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if (rx > 0)
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{
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/* Make the curl radius smaller as more circles are formed (stops
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* z-fighting and looks cool). Note that 10 is a semi-arbitrary
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* number here - divide it by two and it's the amount of space
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* between curled layers of the texture, in pixels.
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*/
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gfloat small_radius;
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small_radius = self->radius
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- MIN (self->radius, (turn_angle * 10) / G_PI);
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/* Calculate a point on a cylinder (maybe make this a cone at some
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* point) and rotate it by the specified angle.
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*/
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rx = (small_radius * cos (turn_angle)) + self->radius;
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vertex->x = (rx * cos (radians)) - (ry * sin (radians)) + cx;
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vertex->y = (rx * sin (radians)) + (ry * cos (radians)) + cy;
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vertex->z = (small_radius * sin (turn_angle)) + self->radius;
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}
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}
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static void
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clutter_page_turn_effect_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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ClutterPageTurnEffect *effect = CLUTTER_PAGE_TURN_EFFECT (gobject);
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switch (prop_id)
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{
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case PROP_PERIOD:
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clutter_page_turn_effect_set_period (effect, g_value_get_double (value));
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break;
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case PROP_ANGLE:
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clutter_page_turn_effect_set_angle (effect, g_value_get_double (value));
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break;
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case PROP_RADIUS:
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clutter_page_turn_effect_set_radius (effect, g_value_get_float (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_page_turn_effect_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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ClutterPageTurnEffect *effect = CLUTTER_PAGE_TURN_EFFECT (gobject);
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switch (prop_id)
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{
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case PROP_PERIOD:
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g_value_set_double (value, effect->period);
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break;
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case PROP_ANGLE:
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g_value_set_double (value, effect->angle);
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break;
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case PROP_RADIUS:
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g_value_set_float (value, effect->radius);
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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_page_turn_effect_class_init (ClutterPageTurnEffectClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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ClutterDeformEffectClass *deform_class = CLUTTER_DEFORM_EFFECT_CLASS (klass);
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GParamSpec *pspec;
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gobject_class->set_property = clutter_page_turn_effect_set_property;
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gobject_class->get_property = clutter_page_turn_effect_get_property;
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/**
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* ClutterPageTurnEffect:period:
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*
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* The period of the page turn, between 0.0 (no curling) and
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* 1.0 (fully curled)
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*
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* Since: 1.4
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*/
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pspec = g_param_spec_double ("period",
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"Period",
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"The period of the page turn",
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0.0, 1.0,
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0.0,
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CLUTTER_PARAM_READWRITE);
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obj_props[PROP_PERIOD] = pspec;
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g_object_class_install_property (gobject_class, PROP_PERIOD, pspec);
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/**
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* ClutterPageTurnEffect:angle:
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*
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* The angle of the page rotation, in degrees, between 0.0 and 360.0
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*
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* Since: 1.4
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*/
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pspec = g_param_spec_double ("angle",
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"Angle",
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"The angle of the page rotation, in degrees",
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0.0, 360.0,
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0.0,
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CLUTTER_PARAM_READWRITE);
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obj_props[PROP_ANGLE] = pspec;
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g_object_class_install_property (gobject_class, PROP_ANGLE, pspec);
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/**
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* ClutterPageTurnEffect:radius:
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*
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* The radius of the page curl, in pixels
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*
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* Since: 1.4
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*/
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pspec = g_param_spec_float ("radius",
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"Radius",
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"The radius of the page curl",
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-G_MAXFLOAT, G_MAXFLOAT,
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24.0,
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CLUTTER_PARAM_READWRITE);
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obj_props[PROP_RADIUS] = pspec;
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g_object_class_install_property (gobject_class, PROP_RADIUS, pspec);
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deform_class->deform_vertex = clutter_page_turn_effect_deform_vertex;
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}
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static void
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clutter_page_turn_effect_init (ClutterPageTurnEffect *self)
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{
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self->period = 0.0;
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self->angle = 0.0;
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self->radius = 24.0f;
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}
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/**
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* clutter_page_turn_effect_new:
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* @period: the period of the page curl, between 0.0 and 1.0
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* @angle: the angle of the page curl, between 0.0 and 360.0
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* @radius: the radius of the page curl, in pixels
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*
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* Creates a new #ClutterPageTurnEffect instance with the given parameters
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*
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* Return value: the newly created #ClutterPageTurnEffect
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*
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* Since: 1.4
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*/
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ClutterEffect *
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clutter_page_turn_effect_new (gdouble period,
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gdouble angle,
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gfloat radius)
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{
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g_return_val_if_fail (period >= 0.0 && period <= 1.0, NULL);
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g_return_val_if_fail (angle >= 0.0 && angle <= 360.0, NULL);
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return g_object_new (CLUTTER_TYPE_PAGE_TURN_EFFECT,
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"period", period,
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"angle", angle,
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"radius", radius,
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NULL);
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}
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/**
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* clutter_page_turn_effect_set_period:
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* @effect: a #ClutterPageTurnEffect
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* @period: the period of the page curl, between 0.0 and 1.0
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*
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* Sets the period of the page curling, between 0.0 (no curling)
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* and 1.0 (fully curled)
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*
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* Since: 1.4
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*/
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void
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clutter_page_turn_effect_set_period (ClutterPageTurnEffect *effect,
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gdouble period)
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{
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g_return_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect));
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g_return_if_fail (period >= 0.0 && period <= 1.0);
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effect->period = period;
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clutter_deform_effect_invalidate (CLUTTER_DEFORM_EFFECT (effect));
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g_object_notify_by_pspec (G_OBJECT (effect), obj_props[PROP_PERIOD]);
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}
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/**
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* clutter_page_turn_effect_get_period:
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* @effect: a #ClutterPageTurnEffect
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*
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* Retrieves the value set using clutter_page_turn_effect_get_period()
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*
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* Return value: the period of the page curling
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*
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* Since: 1.4
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*/
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gdouble
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clutter_page_turn_effect_get_period (ClutterPageTurnEffect *effect)
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{
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g_return_val_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect), 0.0);
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return effect->period;
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}
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/**
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* clutter_page_turn_effect_set_angle:
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* @effect: #ClutterPageTurnEffect
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* @angle: the angle of the page curl, in degrees
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*
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* Sets the angle of the page curling, in degrees
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*
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* Since: 1.4
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*/
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void
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clutter_page_turn_effect_set_angle (ClutterPageTurnEffect *effect,
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gdouble angle)
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{
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g_return_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect));
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g_return_if_fail (angle >= 0.0 && angle <= 360.0);
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effect->angle = angle;
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clutter_deform_effect_invalidate (CLUTTER_DEFORM_EFFECT (effect));
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g_object_notify_by_pspec (G_OBJECT (effect), obj_props[PROP_ANGLE]);
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}
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/**
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* clutter_page_turn_effect_get_angle:
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* @effect: a #ClutterPageTurnEffect:
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*
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* Retrieves the value set using clutter_page_turn_effect_get_angle()
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*
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* Return value: the angle of the page curling
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*
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* Since: 1.4
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*/
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gdouble
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clutter_page_turn_effect_get_angle (ClutterPageTurnEffect *effect)
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{
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g_return_val_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect), 0.0);
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return effect->angle;
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}
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/**
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* clutter_page_turn_effect_set_radius:
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* @effect: a #ClutterPageTurnEffect:
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* @radius: the radius of the page curling, in pixels
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*
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* Sets the radius of the page curling
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*
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* Since: 1.4
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*/
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void
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clutter_page_turn_effect_set_radius (ClutterPageTurnEffect *effect,
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gfloat radius)
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{
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g_return_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect));
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effect->radius = radius;
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clutter_deform_effect_invalidate (CLUTTER_DEFORM_EFFECT (effect));
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g_object_notify_by_pspec (G_OBJECT (effect), obj_props[PROP_RADIUS]);
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}
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/**
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* clutter_page_turn_effect_get_radius:
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* @effect: a #ClutterPageTurnEffect
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*
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* Retrieves the value set using clutter_page_turn_effect_set_radius()
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*
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* Return value: the radius of the page curling
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*
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* Since: 1.4
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*/
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gfloat
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clutter_page_turn_effect_get_radius (ClutterPageTurnEffect *effect)
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{
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g_return_val_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect), 0.0);
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return effect->radius;
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}
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