/*****************************************************************************
 *
 * 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->multi) {
		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) {
		int type = move->ntouch == 2 ? GRAIL_TYPE_PAN :
			move->ntouch == 3 ? GRAIL_TYPE_SWIPE : 0;
		if (!type)
			return 0;
		state->gid = gin_gid_begin(ge, type, PRIO_GESTURE, frame);
		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;
}