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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>
void gru_reset_scroll(struct grail *ge,
const struct touch_frame *frame)
{
struct gesture_inserter *gin = ge->gin;
struct gesture_recognizer *gru = ge->gru;
struct scroll_model *state = &gru->scroll;
struct move_model *move = &gru->move;
gin_gesture_discard_type(gin, GRAIL_TYPE_SCROLL);
state->x = move->x;
state->y = move->y;
state->active = 0;
state->moving = 0;
}
int gru_scroll(struct grail *ge,
const struct touch_frame *frame)
{
struct gesture_inserter *gin = ge->gin;
struct gesture_recognizer *gru = ge->gru;
struct scroll_model *state = &gru->scroll;
struct move_model *move = &gru->move;
grail_prop_t prop[DIM_GRAIL_PROP];
float dx, dy;
int i;
dx = move->x - state->x;
dy = move->y - state->y;
if (fabs(dx) < 1 && fabs(dy) < 1)
return 0;
if (!state->active) {
i = gin_gesture_begin(ge, GRAIL_TYPE_SCROLL, 1,
frame->touches, sizeof(frame->touches));
state->geslot = i;
state->active = 1;
}
if (!state->moving && fabs(dx) < move->xbar && fabs(dy) < move->ybar)
return 0;
state->moving = 1;
prop[0] = dx;
prop[1] = dy;
gin_gesture_event(gin, state->geslot,
move->x, move->y, move->ntouch,
prop, 2);
state->x = move->x;
state->y = move->y;
return 1;
}
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