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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-inserter.h"
#include <string.h>
#include <malloc.h>
#include <errno.h>
struct gesture_recognizer {
struct touch_frame frame;
touch_time_t scroll_time;
int scroll_active;
int scroll_gslot;
int scroll_slots[2];
};
int gru_init(struct grail *ge)
{
ge->gru = calloc(1, sizeof(struct gesture_recognizer));
if (!ge->gru)
return -ENOMEM;
return 0;
}
void gru_destroy(struct grail *ge)
{
free(ge->gru);
ge->gru = NULL;
}
void gru_recognize(struct grail *ge, const struct touch_frame *frame)
{
struct gesture_inserter *gin = ge->gin;
struct gesture_recognizer *gru = ge->gru;
grail_prop_t prop[DIM_GRAIL_PROP];
grail_mask_t span[16];
int slot, nslot, x, y, dx, dy;
if (!gru)
return;
if (frame->ncreate || frame->ndestroy) {
gin_gesture_end_all(gin);
gru->scroll_active = 0;
return;
}
if (frame->ntouch != 2)
return;
memset(span, 0, sizeof(span));
nslot = 0;
x = y = dx = dy = 0;
for (slot = frame->slot; slot >= 0; slot = next_slot(frame, slot)) {
struct touch *ot = &gru->frame.touch[slot];
const struct touch *t = &frame->touch[slot];
gru->scroll_slots[nslot] = slot;
grail_set_mask(span, slot);
x += t->prop[TP_POS_X];
y += t->prop[TP_POS_Y];
dx += t->prop[TP_POS_X] - ot->prop[TP_POS_X];
dy += t->prop[TP_POS_Y] - ot->prop[TP_POS_Y];
nslot++;
}
x /= nslot;
y /= nslot;
dx /= nslot;
dy /= nslot;
if (!dy)
return;
if (!gru->scroll_active) {
gru->scroll_gslot = gin_gesture_begin(ge, frame,
GRAIL_TYPE_VSCROLL,
x, y, span);
gru->scroll_active = 1;
}
prop[0] = dy;
gin_gesture_event(gin, gru->scroll_gslot, prop);
gru->frame = *frame;
}
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