From 7db9d8d76ff61c4802ac15559dcea6fa54ff567a Mon Sep 17 00:00:00 2001
From: Henrik Rydberg <rydberg@euromail.se>
Date: Fri, 6 Aug 2010 21:11:17 +0200
Subject: initial bzr repo at rev 27

---
 src/gestures-tapping.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 src/gestures-tapping.c

(limited to 'src/gestures-tapping.c')

diff --git a/src/gestures-tapping.c b/src/gestures-tapping.c
new file mode 100644
index 0000000..cc0e685
--- /dev/null
+++ b/src/gestures-tapping.c
@@ -0,0 +1,101 @@
+/*****************************************************************************
+ *
+ * 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_BEGIN = 0;
+static const int TAP_END = 1;
+static const int TAP_CANCEL = 2;
+
+static const int TAP_MIN_GAP_MS = 25;
+static const int TAP_MAX_GAP_MS = 300;
+
+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 (move->ntouch) {
+		if (state->status == TAP_CANCEL)
+			return 0;
+		state->status = TAP_BEGIN;
+		if (!state->ntouch)
+			state->start = move->time;
+		if (move->ntouch > state->ntouch) {
+			state->ntouch = move->ntouch;
+			if (state->active) {
+				gin_gid_discard(ge, state->gid);
+				state->active = 0;
+			}
+			state->x = move->x.val;
+			state->y = move->y.val;
+		} else if (state->ntouch == 1) {
+			if (fabs(move->x.val - state->x) > move->y.bar ||
+			    fabs(move->y.val - state->y) > move->y.bar)
+				state->status = TAP_CANCEL;
+		}
+		if (!state->active) {
+			int type = GRAIL_TYPE_TAP1 + state->ntouch - 1;
+			state->gid = gin_gid_begin(ge, type, PRIO_TAP, frame);
+			state->active = 1;
+		}
+	} else if (state->status == TAP_BEGIN && state->ntouch) {
+		state->status = TAP_END;
+	} else {
+		state->status = TAP_BEGIN;
+		state->ntouch = 0;
+		return 0;
+	}
+	if (state->ntouch < 1 || state->ntouch > 5)
+		state->status = TAP_CANCEL;
+	if (move->time - state->start > TAP_MAX_GAP_MS)
+		state->status = TAP_CANCEL;
+	if (state->status == TAP_END &&
+	    move->time - state->start < TAP_MIN_GAP_MS)
+		state->status = TAP_CANCEL;
+	if (move->x.active || move->y.active)
+		state->status = TAP_CANCEL;
+	if (state->status == TAP_CANCEL) {
+		if (state->active) {
+			gin_gid_discard(ge, state->gid);
+			state->active = 0;
+		}
+		state->ntouch = 0;
+		return 0;
+	}
+	if (state->status != TAP_END ||
+	    move->time - state->start < TAP_MIN_GAP_MS)
+		return 0;
+	prop[0] = move->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_BEGIN;
+	state->ntouch = 0;
+	state->active = 0;
+	return 1;
+}
-- 
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