Introduce tapping

Simplify some common parts of the recognizer code and add tapping
to the gesture suite.

Signed-off-by: Henrik Rydberg <rydberg@bitmath.org>

1 files changed, 65 insertions, 0 deletions

diff --git a/src/gestures-pan.c b/src/gestures-pan.c
new file mode 100644
index 0000000..541c502
--- /dev/null
+++ b/src/gestures-pan.c
@@ -0,0 +1,65 @@
+/*****************************************************************************
+ *
+ * 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->motion) {
+                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) {
+                switch(move->ntouch) {
+                case 2:
+                        state->gid = gin_gid_begin(ge, GRAIL_TYPE_PAN, frame);
+                        break;
+                case 3:
+                        state->gid = gin_gid_begin(ge, GRAIL_TYPE_SWIPE, frame);
+                        break;
+                default:
+                        return 0;
+                }
+                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;
+}
+