From 44f300b3a242eb722cc1c82129e5e86daa3eb65d Mon Sep 17 00:00:00 2001 From: Emmanuele Bassi Date: Thu, 10 Jun 2010 16:56:16 +0100 Subject: [PATCH] effect: Add PageTurnEffect A simple deformation effect that simulates a page curl. Ported from MxDeformPageTurn inside the Mx toolkit, written by Chris Lord. --- clutter/Makefile.am | 2 + clutter/clutter-page-turn-effect.c | 417 +++++++++++++++++++++++++++++++++++++ clutter/clutter-page-turn-effect.h | 71 +++++++ clutter/clutter.h | 1 + tests/interactive/test-drag.c | 25 +++ 5 files changed, 516 insertions(+) create mode 100644 clutter/clutter-page-turn-effect.c create mode 100644 clutter/clutter-page-turn-effect.h diff --git a/clutter/Makefile.am b/clutter/Makefile.am index e658c58..f382739 100644 --- a/clutter/Makefile.am +++ b/clutter/Makefile.am @@ -118,6 +118,7 @@ source_h = \ $(srcdir)/clutter-media.h \ $(srcdir)/clutter-model.h \ $(srcdir)/clutter-offscreen-effect.h \ + $(srcdir)/clutter-page-turn-effect.h \ $(srcdir)/clutter-path.h \ $(srcdir)/clutter-rectangle.h \ $(srcdir)/clutter-score.h \ @@ -207,6 +208,7 @@ source_c = \ $(srcdir)/clutter-media.c \ $(srcdir)/clutter-model.c \ $(srcdir)/clutter-offscreen-effect.c \ + $(srcdir)/clutter-page-turn-effect.c \ $(srcdir)/clutter-path.c \ $(srcdir)/clutter-rectangle.c \ $(srcdir)/clutter-score.c \ diff --git a/clutter/clutter-page-turn-effect.c b/clutter/clutter-page-turn-effect.c new file mode 100644 index 0000000..4c8227a --- /dev/null +++ b/clutter/clutter-page-turn-effect.c @@ -0,0 +1,417 @@ +/* + * Clutter. + * + * An OpenGL based 'interactive canvas' library. + * + * Copyright (C) 2010 Intel Corporation. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see . + * + * Author: + * Emmanuele Bassi + * + * Based on MxDeformPageTurn, written by: + * Chris Lord + */ + +/** + * SECTION:clutter-page-turn-effect + * @Title: ClutterPageTurnEffect + * @Short_Description: A page turning effect + * + * A simple page turning effect + * + * #ClutterPageTurnEffect is available since Clutter 1.4 + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "clutter-page-turn-effect.h" + +#include "clutter-debug.h" +#include "clutter-private.h" + +#define CLUTTER_PAGE_TURN_EFFECT_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), CLUTTER_TYPE_PAGE_TURN_EFFECT, ClutterPageTurnEffectClass)) +#define CLUTTER_IS_PAGE_TURN_EFFECT_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), CLUTTER_TYPE_PAGE_TURN_EFFECT)) +#define CLUTTER_PAGE_TURN_EFFECT_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), CLUTTER_TYPE_PAGE_TURN_EFFECT, ClutterPageTurnEffectClass)) + +typedef struct _ClutterPageTurnEffectClass ClutterPageTurnEffectClass; + +struct _ClutterPageTurnEffect +{ + ClutterDeformEffect parent_instance; + + gdouble period; + gdouble angle; + + gfloat radius; +}; + +struct _ClutterPageTurnEffectClass +{ + ClutterDeformEffectClass parent_class; +}; + +enum +{ + PROP_0, + + PROP_PERIOD, + PROP_ANGLE, + PROP_RADIUS +}; + +G_DEFINE_TYPE (ClutterPageTurnEffect, + clutter_page_turn_effect, + CLUTTER_TYPE_DEFORM_EFFECT); + +static void +clutter_page_turn_effect_deform_vertex (ClutterDeformEffect *effect, + gfloat width, + gfloat height, + CoglTextureVertex *vertex) +{ + ClutterPageTurnEffect *self = CLUTTER_PAGE_TURN_EFFECT (effect); + gfloat cx, cy, rx, ry, radians, turn_angle; + guint shade; + + if (self->period == 0.0) + return; + + radians = self->angle * 180.0f / G_PI; + + /* Rotate the point around the centre of the page-curl ray to align it with + * the y-axis. + */ + cx = (1.f - self->period) * width; + cy = (1.f - self->period) * height; + + rx = ((vertex->x - cx) * cos (- radians)) + - ((vertex->y - cy) * sin (- radians)) + - self->radius; + ry = ((vertex->x - cx) * sin (- radians)) + + ((vertex->y - cy) * cos (- radians)); + + turn_angle = 0.f; + if (rx > self->radius * -2.0f) + { + /* Calculate the curl angle as a function from the distance of the curl + * ray (i.e. the page crease) + */ + turn_angle = (rx / self->radius * G_PI_2) - G_PI_2; + shade = (sin (turn_angle) * 96.0f) + 159.0f; + + /* Add a gradient that makes it look like lighting and hides the switch + * between textures. + */ + cogl_color_set_from_4ub (&vertex->color, shade, shade, shade, 0xff); + } + + if (rx > 0) + { + /* Make the curl radius smaller as more circles are formed (stops + * z-fighting and looks cool). Note that 10 is a semi-arbitrary + * number here - divide it by two and it's the amount of space + * between curled layers of the texture, in pixels. + */ + gfloat small_radius; + + small_radius = self->radius + - MIN (self->radius, (turn_angle * 10) / G_PI); + + /* Calculate a point on a cylinder (maybe make this a cone at some + * point) and rotate it by the specified angle. + */ + rx = (small_radius * cos (turn_angle)) + self->radius; + + vertex->x = (rx * cos (radians)) - (ry * sin (radians)) + cx; + vertex->y = (rx * sin (radians)) + (ry * cos (radians)) + cy; + vertex->z = (small_radius * sin (turn_angle)) + self->radius; + } +} + +static void +clutter_page_turn_effect_set_property (GObject *gobject, + guint prop_id, + const GValue *value, + GParamSpec *pspec) +{ + ClutterPageTurnEffect *effect = CLUTTER_PAGE_TURN_EFFECT (gobject); + + switch (prop_id) + { + case PROP_PERIOD: + clutter_page_turn_effect_set_period (effect, g_value_get_double (value)); + break; + + case PROP_ANGLE: + clutter_page_turn_effect_set_angle (effect, g_value_get_double (value)); + break; + + case PROP_RADIUS: + clutter_page_turn_effect_set_radius (effect, g_value_get_float (value)); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec); + break; + } +} + +static void +clutter_page_turn_effect_get_property (GObject *gobject, + guint prop_id, + GValue *value, + GParamSpec *pspec) +{ + ClutterPageTurnEffect *effect = CLUTTER_PAGE_TURN_EFFECT (gobject); + + switch (prop_id) + { + case PROP_PERIOD: + g_value_set_double (value, effect->period); + break; + + case PROP_ANGLE: + g_value_set_double (value, effect->angle); + break; + + case PROP_RADIUS: + g_value_set_float (value, effect->radius); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec); + break; + } +} + +static void +clutter_page_turn_effect_class_init (ClutterPageTurnEffectClass *klass) +{ + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + ClutterDeformEffectClass *deform_class = CLUTTER_DEFORM_EFFECT_CLASS (klass); + GParamSpec *pspec; + + gobject_class->set_property = clutter_page_turn_effect_set_property; + gobject_class->get_property = clutter_page_turn_effect_get_property; + + /** + * ClutterPageTurnEffect:period: + * + * The period of the page turn, between 0.0 (no curling) and + * 1.0 (fully curled) + * + * Since: 1.4 + */ + pspec = g_param_spec_double ("period", + "Period", + "The period of the page turn", + 0.0, 1.0, + 0.0, + CLUTTER_PARAM_READWRITE); + g_object_class_install_property (gobject_class, PROP_PERIOD, pspec); + + /** + * ClutterPageTurnEffect:angle: + * + * The angle of the page rotation, in degrees, between 0.0 and 360.0 + * + * Since: 1.4 + */ + pspec = g_param_spec_double ("angle", + "Angle", + "The angle of the page rotation, in degrees", + 0.0, 360.0, + 0.0, + CLUTTER_PARAM_READWRITE); + g_object_class_install_property (gobject_class, PROP_ANGLE, pspec); + + /** + * ClutterPageTurnEffect:radius: + * + * The radius of the page curl, in pixels + * + * Since: 1.4 + */ + pspec = g_param_spec_float ("radius", + "Radius", + "The radius of the page curl", + -G_MAXFLOAT, G_MAXFLOAT, + 24.0, + CLUTTER_PARAM_READWRITE); + g_object_class_install_property (gobject_class, PROP_RADIUS, pspec); + + deform_class->deform_vertex = clutter_page_turn_effect_deform_vertex; +} + +static void +clutter_page_turn_effect_init (ClutterPageTurnEffect *self) +{ + self->period = 0.0; + self->angle = 0.0; + self->radius = 24.0f; +} + +/** + * clutter_page_turn_effect_new: + * @period: the period of the page curl, between 0.0 and 1.0 + * @angle: the angle of the page curl, between 0.0 and 360.0 + * @radius: the radius of the page curl, in pixels + * + * Creates a new #ClutterPageTurnEffect instance with the given parameters + * + * Return value: the newly created #ClutterPageTurnEffect + * + * Since: 1.4 + */ +ClutterEffect * +clutter_page_turn_effect_new (gdouble period, + gdouble angle, + gfloat radius) +{ + g_return_val_if_fail (period >= 0.0 && period <= 1.0, NULL); + g_return_val_if_fail (angle >= 0.0 && angle <= 360.0, NULL); + + return g_object_new (CLUTTER_TYPE_PAGE_TURN_EFFECT, + "period", period, + "angle", angle, + "radius", radius, + NULL); +} + +/** + * clutter_page_turn_effect_set_period: + * @effect: a #ClutterPageTurnEffect + * @period: the period of the page curl, between 0.0 and 1.0 + * + * Sets the period of the page curling, between 0.0 (no curling) + * and 1.0 (fully curled) + * + * Since: 1.4 + */ +void +clutter_page_turn_effect_set_period (ClutterPageTurnEffect *effect, + gdouble period) +{ + g_return_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect)); + g_return_if_fail (period >= 0.0 && period <= 1.0); + + effect->period = period; + + clutter_deform_effect_invalidate (CLUTTER_DEFORM_EFFECT (effect)); + + g_object_notify (G_OBJECT (effect), "period"); +} + +/** + * clutter_page_turn_effect_get_period: + * @effect: a #ClutterPageTurnEffect + * + * Retrieves the value set using clutter_page_turn_effect_get_period() + * + * Return value: the period of the page curling + * + * Since: 1.4 + */ +gdouble +clutter_page_turn_effect_get_period (ClutterPageTurnEffect *effect) +{ + g_return_val_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect), 0.0); + + return effect->period; +} + +/** + * clutter_page_turn_effect_set_angle: + * @effect: #ClutterPageTurnEffect + * @angle: the angle of the page curl, in degrees + * + * Sets the angle of the page curling, in degrees + * + * Since: 1.4 + */ +void +clutter_page_turn_effect_set_angle (ClutterPageTurnEffect *effect, + gdouble angle) +{ + g_return_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect)); + g_return_if_fail (angle >= 0.0 && angle <= 360.0); + + effect->angle = angle; + + clutter_deform_effect_invalidate (CLUTTER_DEFORM_EFFECT (effect)); + + g_object_notify (G_OBJECT (effect), "angle"); +} + +/** + * clutter_page_turn_effect_get_angle: + * @effect: a #ClutterPageTurnEffect: + * + * Retrieves the value set using clutter_page_turn_effect_get_angle() + * + * Return value: the angle of the page curling + * + * Since: 1.4 + */ +gdouble +clutter_page_turn_effect_get_angle (ClutterPageTurnEffect *effect) +{ + g_return_val_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect), 0.0); + + return effect->angle; +} + +/** + * clutter_page_turn_effect_set_radius: + * @effect: a #ClutterPageTurnEffect: + * @radius: the radius of the page curling, in pixels + * + * Sets the radius of the page curling + * + * Since: 1.4 + */ +void +clutter_page_turn_effect_set_radius (ClutterPageTurnEffect *effect, + gfloat radius) +{ + g_return_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect)); + + effect->radius = radius; + + clutter_deform_effect_invalidate (CLUTTER_DEFORM_EFFECT (effect)); + + g_object_notify (G_OBJECT (effect), "radius"); +} + +/** + * clutter_page_turn_effect_get_radius: + * @effect: a #ClutterPageTurnEffect + * + * Retrieves the value set using clutter_page_turn_effect_set_radius() + * + * Return value: the radius of the page curling + * + * Since: 1.4 + */ +gfloat +clutter_page_turn_effect_get_radius (ClutterPageTurnEffect *effect) +{ + g_return_val_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect), 0.0); + + return effect->radius; +} diff --git a/clutter/clutter-page-turn-effect.h b/clutter/clutter-page-turn-effect.h new file mode 100644 index 0000000..ca95fb8 --- /dev/null +++ b/clutter/clutter-page-turn-effect.h @@ -0,0 +1,71 @@ +/* + * Clutter. + * + * An OpenGL based 'interactive canvas' library. + * + * Copyright (C) 2010 Intel Corporation. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see . + * + * Author: + * Emmanuele Bassi + * + * Based on MxDeformPageTurn, written by: + * Chris Lord + */ + +#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION) +#error "Only can be included directly." +#endif + +#ifndef __CLUTTER_PAGE_TURN_EFFECT_H__ +#define __CLUTTER_PAGE_TURN_EFFECT_H__ + +#include + +G_BEGIN_DECLS + +#define CLUTTER_TYPE_PAGE_TURN_EFFECT (clutter_page_turn_effect_get_type ()) +#define CLUTTER_PAGE_TURN_EFFECT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_PAGE_TURN_EFFECT, ClutterPageTurnEffect)) +#define CLUTTER_IS_PAGE_TURN_EFFECT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_PAGE_TURN_EFFECT)) + +/** + * ClutterPageTurnEffect: + * + * ClutterPageTurnEffect is an opaque structure + * whose members can only be accessed using the provided API + * + * Since: 1.4 + */ +typedef struct _ClutterPageTurnEffect ClutterPageTurnEffect; + +GType clutter_page_turn_effect_get_type (void) G_GNUC_CONST; + +ClutterEffect *clutter_page_turn_effect_new (gdouble period, + gdouble angle, + gfloat radius); + +void clutter_page_turn_effect_set_period (ClutterPageTurnEffect *effect, + gdouble period); +gdouble clutter_page_turn_effect_get_period (ClutterPageTurnEffect *effect); +void clutter_page_turn_effect_set_angle (ClutterPageTurnEffect *effect, + gdouble angle); +gdouble clutter_page_turn_effect_get_angle (ClutterPageTurnEffect *effect); +void clutter_page_turn_effect_set_radius (ClutterPageTurnEffect *effect, + gfloat radius); +gfloat clutter_page_turn_effect_get_radius (ClutterPageTurnEffect *effect); + +G_END_DECLS + +#endif /* __CLUTTER_PAGE_TURN_EFFECT_H__ */ diff --git a/clutter/clutter.h b/clutter/clutter.h index 70c8fa3..3f64f09 100644 --- a/clutter/clutter.h +++ b/clutter/clutter.h @@ -81,6 +81,7 @@ #include "clutter-media.h" #include "clutter-model.h" #include "clutter-offscreen-effect.h" +#include "clutter-page-turn-effect.h" #include "clutter-path.h" #include "clutter-rectangle.h" #include "clutter-score.h" diff --git a/tests/interactive/test-drag.c b/tests/interactive/test-drag.c index 08197c3..7fda1a5 100644 --- a/tests/interactive/test-drag.c +++ b/tests/interactive/test-drag.c @@ -2,6 +2,28 @@ #include #include +static gboolean +on_enter (ClutterActor *actor, + ClutterEvent *event) +{ + clutter_actor_animate (actor, CLUTTER_LINEAR, 150, + "@effects.curl.period", 0.25, + NULL); + + return FALSE; +} + +static gboolean +on_leave (ClutterActor *actor, + ClutterEvent *event) +{ + clutter_actor_animate (actor, CLUTTER_LINEAR, 150, + "@effects.curl.period", 0.0, + NULL); + + return FALSE; +} + static void on_drag_begin (ClutterDragAction *action, ClutterActor *actor, @@ -156,6 +178,8 @@ test_drag_main (int argc, char *argv[]) clutter_actor_set_position (handle, (800 - 128) / 2, (600 - 128) / 2); clutter_actor_set_reactive (handle, TRUE); clutter_container_add_actor (CLUTTER_CONTAINER (stage), handle); + g_signal_connect (handle, "enter-event", G_CALLBACK (on_enter), NULL); + g_signal_connect (handle, "leave-event", G_CALLBACK (on_leave), NULL); action = clutter_drag_action_new (); clutter_drag_action_set_drag_threshold (CLUTTER_DRAG_ACTION (action), @@ -169,6 +193,7 @@ test_drag_main (int argc, char *argv[]) clutter_actor_add_action (handle, action); clutter_actor_add_effect_with_name (handle, "disable", clutter_desaturate_effect_new (0.0)); + clutter_actor_add_effect_with_name (handle, "curl", clutter_page_turn_effect_new (0.0, 135.0, 12.0)); clutter_actor_show (stage); -- 2.7.4