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/*****************************************************************************
*
* 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-touch.h>
#include <math.h>
/* see mtdev-mapping.h */
#define MTDEV_POSITION_X 5
#define MTDEV_POSITION_Y 6
#define MTDEV_ORIENTATION 4
#define MTDEV_PRESSURE 10
void touch_caps_init(struct touch_dev *dev)
{
const struct mtdev_caps *mt = &dev->mtdev.caps;
struct touch_caps *caps = &dev->caps;
caps->min_x = mt->abs[MTDEV_POSITION_X].minimum;
caps->max_x = mt->abs[MTDEV_POSITION_X].maximum;
caps->min_y = mt->abs[MTDEV_POSITION_Y].minimum;
caps->max_y = mt->abs[MTDEV_POSITION_Y].maximum;
caps->min_orient = mt->abs[MTDEV_ORIENTATION].minimum;
caps->max_orient = mt->abs[MTDEV_ORIENTATION].maximum;
caps->min_press = mt->abs[MTDEV_PRESSURE].minimum;
caps->max_press = mt->abs[MTDEV_PRESSURE].maximum;
if (caps->min_x == caps->max_x) {
caps->min_x = 0;
caps->max_x = 1024;
}
if (caps->min_y == caps->max_y) {
caps->min_y = 0;
caps->max_y = 768;
}
if (caps->min_orient == caps->max_orient) {
caps->min_orient = 0;
caps->max_orient = 1;
}
if (caps->min_press == caps->max_press) {
caps->min_press = 0;
caps->max_press = 256;
}
}
float touch_angle(const struct touch_dev *dev, int orient)
{
const struct touch_caps *caps = &dev->caps;
double div = caps->max_orient - caps->min_orient;
return ((orient - caps->min_orient) / div - 0.5) * M_PI;
}
float touch_pressure(const struct touch_dev *dev, int press)
{
const struct touch_caps *caps = &dev->caps;
return (press - caps->min_press) / (caps->max_press - caps->min_press);
}
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