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actor: Clean up the order of transformations

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https://bugzilla.gnome.org/show_bug.cgi?id=677853
This commit is contained in:
Emmanuele Bassi 2012-07-06 18:27:45 +01:00
parent 1796b37948
commit 6feee080b3
1 changed files with 38 additions and 41 deletions
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71
clutter/clutter-actor.c
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@ -2958,27 +2958,32 @@ clutter_actor_real_apply_transform (ClutterActor *self,
info = _clutter_actor_get_transform_info_or_defaults (self);
/* compute the pivot point given the allocated size */
if (!clutter_point_equals (&info->pivot, clutter_point_zero ()))
{
pivot_x = (priv->allocation.x2 - priv->allocation.x1)
* info->pivot.x;
pivot_y = (priv->allocation.y2 - priv->allocation.y1)
* info->pivot.y;
}
CLUTTER_NOTE (PAINT,
"Allocation: (%.2f, %2.f), "
"pivot: (%.2f, %.2f), "
"translation: (%.2f, %.2f) -> "
"new origin: (%.2f, %.2f)",
priv->allocation.x1, priv->allocation.y1,
info->pivot.x, info->pivot.y,
info->translation.x, info->translation.y,
priv->allocation.x1 + pivot_x + info->translation.x,
priv->allocation.y1 + pivot_y + info->translation.y);
cogl_matrix_init_identity (transform);
/* basic translation: :allocation's origin and :z-position; instead
* of decomposing the pivot and translation info separate operations,
* we just compose everything into a single translation
*/
cogl_matrix_translate (transform,
priv->allocation.x1,
priv->allocation.y1,
0.0);
if (info->z_position != 0.f)
cogl_matrix_translate (transform, 0, 0, info->z_position);
/* pivot point, used as the transformation center */
if (pivot_x != 0.f || pivot_y != 0.f)
cogl_matrix_translate (transform, pivot_x, pivot_y, info->pivot_z);
priv->allocation.x1 + pivot_x + info->translation.x,
priv->allocation.y1 + pivot_y + info->translation.y,
info->z_position + info->pivot_z + info->translation.z);
/*
* because the rotation involves translations, we must scale
@ -3037,19 +3042,9 @@ clutter_actor_real_apply_transform (ClutterActor *self,
cogl_matrix_translate (transform, -x, -y, -z);
}
if (info->translation.x != 0.f ||
info->translation.y != 0.f ||
info->translation.z != 0.f)
{
cogl_matrix_translate (transform,
-info->translation.x,
-info->translation.y,
-info->translation.z);
}
/* roll back the pivot translation */
if (pivot_x != 0.f || pivot_y != 0.f)
cogl_matrix_translate (transform, -pivot_x, -pivot_y, 0.f);
if (pivot_x != 0.f || pivot_y != 0.f || info->pivot_z != 0.f)
cogl_matrix_translate (transform, -pivot_x, -pivot_y, -info->pivot_z);
priv->transform_valid = TRUE;
}
@ -6585,6 +6580,8 @@ clutter_actor_class_init (ClutterActorClass *klass)
* being the top left corner of the actor and (1, 1) the bottom right corner
* of the actor.
*
* The default pivot point is located at (0, 0).
*
* The #ClutterActor:pivot property is animatable.
*
* Since: 1.12
@ -6853,10 +6850,10 @@ clutter_actor_class_init (ClutterActorClass *klass)
* #ClutterActor:anchor-y, and #ClutterActor:anchor-gravity in newly
* written code; the anchor point adds an additional translation that
* will affect the actor's relative position with regards to its
* parent, as well as the position of its children. This change is
* needs to always be taken into account when positioning the actor.
* It is recommended to use the #ClutterActor:pivot-point property
* instead, as it will affect only the transformations.</warning>
* parent, as well as the position of its children. This change needs
* to always be taken into account when positioning the actor. It is
* recommended to use the #ClutterActor:pivot-point property instead,
* as it will affect only the transformations.</warning>
*
* Since: 0.8
*
@ -6882,10 +6879,10 @@ clutter_actor_class_init (ClutterActorClass *klass)
* #ClutterActor:anchor-y, and #ClutterActor:anchor-gravity in newly
* written code; the anchor point adds an additional translation that
* will affect the actor's relative position with regards to its
* parent, as well as the position of its children. This change is
* needs to always be taken into account when positioning the actor.
* It is recommended to use the #ClutterActor:pivot-point property
* instead, as it will affect only the transformations.</warning>
* parent, as well as the position of its children. This change needs
* to always be taken into account when positioning the actor. It is
* recommended to use the #ClutterActor:pivot-point property instead,
* as it will affect only the transformations.</warning>
*
* Since: 0.8
*
@ -6910,10 +6907,10 @@ clutter_actor_class_init (ClutterActorClass *klass)
* #ClutterActor:anchor-y, and #ClutterActor:anchor-gravity in newly
* written code; the anchor point adds an additional translation that
* will affect the actor's relative position with regards to its
* parent, as well as the position of its children. This change is
* needs to always be taken into account when positioning the actor.
* It is recommended to use the #ClutterActor:pivot-point property
* instead, as it will affect only the transformations.</warning>
* parent, as well as the position of its children. This change needs
* to always be taken into account when positioning the actor. It is
* recommended to use the #ClutterActor:pivot-point property instead,
* as it will affect only the transformations.</warning>
*
* Since: 1.0
*