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/*****************************************************************************
*
* grail - Gesture Recognition And Instantiation Library
*
* Copyright (C) 2010 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Henrik Rydberg <rydberg@bitmath.org>
*
****************************************************************************/
#include "grail-recognizer.h"
#include <math.h>
#include <stdio.h>
int gru_pan(struct grail *ge,
const struct touch_frame *frame)
{
struct gesture_recognizer *gru = ge->gru;
struct combo_model *state = &gru->pan;
struct move_model *move = &gru->move;
grail_prop_t prop[DIM_GRAIL_PROP];
if (!move->motion) {
if (state->active) {
gru_end(ge, state->gid, move);
state->active = 0;
}
return 0;
}
if (!move->x.tickle && !move->y.tickle)
return 0;
if (!state->active) {
switch(move->ntouch) {
case 2:
state->gid = gin_gid_begin(ge, GRAIL_TYPE_PAN, frame);
break;
case 3:
state->gid = gin_gid_begin(ge, GRAIL_TYPE_SWIPE, frame);
break;
default:
return 0;
}
state->active = 1;
}
if (!move->x.active && !move->y.active)
return 0;
prop[0] = move->x.active ? move->x.delta : 0;
prop[1] = move->y.active ? move->y.delta : 0;
gru_event(ge, state->gid, move, prop, 2);
return 1;
}
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