Add grail_contact and a method to retrieve the current contacts

This patch adds the possibility to extract the current set of
contacts from the grail state.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

1 files changed, 51 insertions, 0 deletions

diff --git a/src/grail-event.c b/src/grail-event.c
new file mode 100644
index 0000000..6479cc0
--- /dev/null
+++ b/src/grail-event.c
@@ -0,0 +1,51 @@
+/*****************************************************************************
+ *
+ * grail - Gesture Recognition And Instantiation Library
+ *
+ * Copyright (C) 2010 Canonical Ltd.
+ * Copyright (C) 2010 Henrik Rydberg <rydberg@bitmath.org>
+ *
+ * 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/>.
+ *
+ ****************************************************************************/
+
+#include "grail-inserter.h"
+#include "grail-impl.h"
+#include <math.h>
+
+int grail_get_contacts(const struct grail *ge,
+                       struct grail_contact *touch, int max_touch)
+{
+        const struct touch_dev *dev = &ge->impl->dev;
+        const struct gesture_inserter *gin = ge->gin;
+        const struct touch_frame *frame = &dev->frame;
+        int i;
+        if (frame->nactive < max_touch)
+                max_touch = frame->nactive;
+        for (i = 0; i < max_touch; i++) {
+                struct grail_contact *t = &touch[i];
+                const struct touch *ct = frame->active[i];
+                t->id = ct->id;
+                t->tool_type = ct->tool_type;
+                t->pos.x = gin_prop_x(gin, ct->x);
+                t->pos.y = gin_prop_y(gin, ct->y);
+                t->touch_major = gin->scale_r * ct->touch_major;
+                t->touch_minor = gin->scale_r * ct->touch_minor;
+                t->width_major = gin->scale_r * ct->width_major;
+                t->width_minor = gin->scale_r * ct->width_minor;
+                t->angle = touch_angle(dev, ct->orientation);
+                t->pressure = touch_pressure(dev, ct->pressure);
+        }
+        return max_touch;
+}