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added tilt parameter to clutter_behaviour_ellipse_new()

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Tomas Frydrych 2007-05-15 11:51:14 +00:00
parent 23ac88ac70
commit 92754aaeee
4 changed files with 113 additions and 5 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
2007-05-15 Tomas Frydrych <tf@openedhand.com>
* clutter/clutter-behaviour-ellipse.h:
* clutter/clutter-behaviour-ellipse.c:
(clutter_behaviour_ellipse_new):
Added a tilt parameter.
2007-05-14 Matthew Allum <mallum@openedhand.com>
* clutter/clutter-behaviour-path.c:

101
clutter/clutter-behaviour-ellipse.c
View file

@ -79,6 +79,7 @@ enum
PROP_HEIGHT,
PROP_ANGLE_BEGIN,
PROP_ANGLE_END,
PROP_ANGLE_TILT,
};
struct _ClutterBehaviourEllipsePrivate
@ -91,6 +92,7 @@ struct _ClutterBehaviourEllipsePrivate
gint b;
ClutterAngle angle_begin;
ClutterAngle angle_end;
ClutterAngle angle_tilt;
};
static void
@ -104,9 +106,39 @@ clutter_behaviour_ellipse_advance (ClutterBehaviourEllipse * e,
ClutterAngle angle,
ClutterKnot * knot)
{
knot->x = CFX_INT (e->priv->a * clutter_cosi (angle));
knot->y = CFX_INT (e->priv->b * clutter_sini (angle));
gint x = CFX_INT (e->priv->a * clutter_cosi (angle));
gint y = CFX_INT (e->priv->b * clutter_sini (angle));
if (e->priv->angle_tilt)
{
/* Problem: sqrti is not giving us sufficient precission here
* and ClutterFixed range is too small to hold x^2+y^2 even for
* reasonable x, y values.
*
* We take advantage of sqrt (a * b^2) == sqrt (a) * b,
* and divide repeatedly by 4 until we get it into range, and then
* multiply the result by 2 the same number of times.
*/
ClutterFixed r;
guint q = x*x + y*y;
gint shift = 0;
while (q > G_MAXINT16)
{
++shift;
q >>= 2;
}
r = clutter_sqrtx (CLUTTER_INT_TO_FIXED (q)) << shift;
x = CFX_INT (CFX_MUL (r, clutter_cosi (angle + e->priv->angle_tilt)));
y = CFX_INT (CFX_MUL (r, clutter_sini (angle + e->priv->angle_tilt)));
}
knot->x = x;
knot->y = y;
#if 0
g_debug ("advancing to angle %d [%d, %d] (a: %d, b: %d)",
angle, knot->x, knot->y, e->priv->a, e->priv->b);
@ -175,6 +207,9 @@ clutter_behaviour_ellipse_set_property (GObject *gobject,
case PROP_ANGLE_END:
priv->angle_end = g_value_get_int (value);
break;
case PROP_ANGLE_TILT:
priv->angle_tilt = g_value_get_int (value);
break;
case PROP_WIDTH:
priv->a = g_value_get_int (value) >> 1;
break;
@ -208,6 +243,9 @@ clutter_behaviour_ellipse_get_property (GObject *gobject,
case PROP_ANGLE_END:
g_value_set_int (value, priv->angle_end);
break;
case PROP_ANGLE_TILT:
g_value_set_int (value, priv->angle_tilt);
break;
case PROP_WIDTH:
g_value_set_int (value, 2 * priv->a);
break;
@ -263,6 +301,22 @@ clutter_behaviour_ellipse_class_init (ClutterBehaviourEllipseClass *klass)
"Final angle",
0, G_MAXINT, 1024,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourEllipse:angle-end:
*
* The final angle to where the rotation should end.
*
* Since: 0.4
*/
g_object_class_install_property (object_class,
PROP_ANGLE_TILT,
g_param_spec_int ("angle-tilt",
"Angle Tilt",
"Tilt of the ellipse",
0, G_MAXINT, 1024,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourEllipse:width:
*
@ -344,6 +398,8 @@ clutter_behaviour_ellipse_init (ClutterBehaviourEllipse * self)
* @height: height of the ellipse
* @begin: #ClutterAngle at which movement begins
* @end: #ClutterAngle at which movement ends
* @tilt: #ClutterAngle with which the ellipse should be tilted around its
* center
*
* Creates a behaviour that drives actors along an elliptical path with
* given center, width and height; the movement begins at angle_begin and
@ -360,7 +416,8 @@ clutter_behaviour_ellipse_new (ClutterAlpha * alpha,
gint width,
gint height,
ClutterAngle begin,
ClutterAngle end)
ClutterAngle end,
ClutterAngle tilt)
{
ClutterBehaviourEllipse *bc;
@ -373,6 +430,7 @@ clutter_behaviour_ellipse_new (ClutterAlpha * alpha,
"height", height,
"angle-begin", begin,
"angle-end", end,
"angle-tilt", tilt,
NULL);
return CLUTTER_BEHAVIOUR (bc);
@ -563,3 +621,40 @@ 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;
}

8
clutter/clutter-behaviour-ellipse.h
View file

@ -86,7 +86,8 @@ ClutterBehaviour *clutter_behaviour_ellipse_new (ClutterAlpha
gint width,
gint height,
ClutterAngle start,
ClutterAngle end);
ClutterAngle end,
ClutterAngle tilt);
void clutter_behaviour_ellipse_set_center (ClutterBehaviourEllipse * self,
ClutterKnot * knot);
@ -113,6 +114,11 @@ void clutter_behaviour_ellipse_set_angle_end (ClutterBehaviourEll
ClutterAngle clutter_behaviour_ellipse_get_angle_end (ClutterBehaviourEllipse * self);
void clutter_behaviour_ellipse_set_angle_tilt (ClutterBehaviourEllipse * self,
ClutterAngle angle_tilt);
ClutterAngle clutter_behaviour_ellipse_get_angle_tilt (ClutterBehaviourEllipse * self);
G_END_DECLS
#endif /* __CLUTTER_BEHAVIOUR_ELLIPSE_H__ */

2
examples/behave.c
View file

@ -166,7 +166,7 @@ main (int argc, char *argv[])
case PATH_ELLIPSE:
p_behave =
clutter_behaviour_ellipse_new (alpha, &origin, 400, 300,
1024, 0);
0, 1024, 0);
break;
case PATH_BSPLINE: