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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>
static const int TAP_INIT = 0;
static const int TAP_BEGIN = 1;
static const int TAP_END = 2;
static const int TAP_CANCEL = 3;
static const int TAP_MIN_GAP_MS = 25;
static const int TAP_MAX_GAP_MS = 400;
int gru_tapping(struct grail *ge,
const struct touch_frame *frame)
{
struct gesture_recognizer *gru = ge->gru;
struct tapping_model *state = &gru->tapping;
struct move_model *move = &gru->move;
grail_prop_t prop[DIM_GRAIL_PROP];
if (state->status == TAP_CANCEL) {
if (move->ntouch)
return 0;
else
state->status = TAP_INIT;
}
if (move->ntouch > state->ntouch) {
if (!state->ntouch) {
state->start = frame->time;
state->status = TAP_BEGIN;
}
state->ntouch = move->ntouch;
} else if (move->ntouch < state->ntouch) {
if (!move->ntouch)
state->status = TAP_END;
}
if (state->status == TAP_INIT)
return 0;
if (state->ntouch < 1 || state->ntouch > 5) {
state->status = TAP_CANCEL;
}
if (frame->time - state->start > TAP_MAX_GAP_MS) {
state->status = TAP_CANCEL;
}
if (state->status == TAP_END &&
frame->time - state->start < TAP_MIN_GAP_MS) {
state->status = TAP_CANCEL;
}
if (state->status == TAP_CANCEL) {
if (state->active) {
gru_end(ge, state->gid, move);
state->active = 0;
}
state->ntouch = 0;
return 0;
}
if (frame->time - state->start < TAP_MIN_GAP_MS)
return 0;
if (!state->active) {
int type = GRAIL_TYPE_TAP1 + state->ntouch - 1;
state->gid = gin_gid_begin(ge, type, frame);
state->active = 1;
}
if (state->status != TAP_END)
return 0;
prop[0] = frame->time - state->start;
gin_gid_event(ge, state->gid,
move->x.val, move->y.val, state->ntouch,
prop, 1, GRAIL_STATUS_END);
state->status = TAP_INIT;
state->ntouch = 0;
state->active = 0;
return 1;
}
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