/* Timeline handler */
static void
frame_cb (ClutterTimeline *timeline,
gint frame_num,
gpointer data)
{
SuperOH *oh = data;
gint i;
/* Rotate everything clockwise about stage center*/
clutter_actor_set_rotation (CLUTTER_ACTOR (oh->group),
CLUTTER_Z_AXIS,
frame_num,
CLUTTER_STAGE_WIDTH () / 2,
CLUTTER_STAGE_HEIGHT () / 2,
0);
for (i = 0; i < n_hands; i++)
{
gdouble scale_x, scale_y;
clutter_actor_get_scale (oh->hand[i], &scale_x, &scale_y);
/* Rotate each hand around there centers - to get this we need
* to take into account any scaling.
*
* FIXME: scaling causes drift so disabled for now. Need rotation
* unit based functions to fix.
*/
clutter_actor_set_rotation (oh->hand[i], CLUTTER_Z_AXIS,
- 6.0 * frame_num, 0, 0, 0);
}
}
/* on double click, zoom in on the clicked point;
* also keeps scale in the range 0.1 to 20
*/
static gboolean
clicked_cb (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
gdouble scale;
gfloat click_x, click_y;
gfloat click_target_x, click_target_y;
guint32 button;
/* don't do anything unless there was a double click */
if (clutter_event_get_click_count (event) < 2)
return TRUE;
/* work out new scale */
button = clutter_event_get_button (event);
clutter_actor_get_scale (actor, &scale, NULL);
if (button == CLUTTER_BUTTON_PRIMARY)
scale *= 1.2;
else if (button == CLUTTER_BUTTON_SECONDARY)
scale /= 1.2;
/* don't do anything if scale is outside bounds */
if (scale < 0.1 || scale > 20.0)
return TRUE;
/* get the location of the click on the scaled actor */
clutter_event_get_coords (event, &click_x, &click_y);
clutter_actor_transform_stage_point (actor,
click_x, click_y,
&click_target_x, &click_target_y);
/* anchor the actor on the clicked point on its surface */
clutter_actor_set_anchor_point (actor, click_target_x, click_target_y);
/* set the actor's position to the click coords: it won't move,
* because the anchor point is already there; but
* the scale will now be centered on these coords (as the
* scale center defaults to the anchor point); so the anchor point
* on the actor won't move from under the pointer
*/
clutter_actor_set_position (actor, click_x, click_y);
clutter_actor_animate (actor, CLUTTER_LINEAR, 500,
"scale-x", scale,
"scale-y", scale,
NULL);
return TRUE;
}
static gboolean
clutter_zoom_action_real_zoom (ClutterZoomAction *action,
ClutterActor *actor,
ClutterPoint *focal_point,
gdouble factor)
{
ClutterZoomActionPrivate *priv = action->priv;
gfloat x, y, z;
gdouble scale_x, scale_y;
ClutterVertex out, in;
in.x = priv->transformed_focal_point.x;
in.y = priv->transformed_focal_point.y;
in.z = 0;
clutter_actor_apply_transform_to_point (actor, &in, &out);
clutter_actor_get_scale (actor, &scale_x, &scale_y);
switch (priv->zoom_axis)
{
case CLUTTER_ZOOM_BOTH:
clutter_actor_set_scale (actor, factor, factor);
break;
case CLUTTER_ZOOM_X_AXIS:
clutter_actor_set_scale (actor, factor, scale_y);
break;
case CLUTTER_ZOOM_Y_AXIS:
clutter_actor_set_scale (actor, scale_x, factor);
break;
default:
break;
}
x = priv->initial_x + priv->focal_point.x - priv->initial_focal_point.x;
y = priv->initial_y + priv->focal_point.y - priv->initial_focal_point.y;
clutter_actor_get_translation (actor, NULL, NULL, &z);
clutter_actor_set_translation (actor, x, y, z);
return TRUE;
}
static gboolean
clutter_zoom_action_gesture_begin (ClutterGestureAction *action,
ClutterActor *actor)
{
ClutterZoomActionPrivate *priv = ((ClutterZoomAction *) action)->priv;
gfloat dx, dy;
capture_point_initial_position (action, actor, 0, &priv->points[0]);
capture_point_initial_position (action, actor, 1, &priv->points[1]);
dx = priv->points[1].transformed_start_x - priv->points[0].transformed_start_x;
dy = priv->points[1].transformed_start_y - priv->points[0].transformed_start_y;
priv->zoom_initial_distance = sqrt (dx * dx + dy * dy);
clutter_actor_get_translation (actor,
&priv->initial_x,
&priv->initial_y,
&priv->initial_z);
clutter_actor_get_scale (actor,
&priv->initial_scale_x,
&priv->initial_scale_y);
priv->initial_focal_point.x = (priv->points[0].start_x + priv->points[1].start_x) / 2;
priv->initial_focal_point.y = (priv->points[0].start_y + priv->points[1].start_y) / 2;
clutter_actor_transform_stage_point (actor,
priv->initial_focal_point.x,
priv->initial_focal_point.y,
&priv->transformed_focal_point.x,
&priv->transformed_focal_point.y);
clutter_actor_set_pivot_point (actor,
priv->transformed_focal_point.x / clutter_actor_get_width (actor),
priv->transformed_focal_point.y / clutter_actor_get_height (actor));
return TRUE;
}
