79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
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* This file is part of MultiROM.
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*
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* MultiROM is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* MultiROM is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MultiROM. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include "touch_tracker.h"
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#include "util.h"
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touch_tracker *touch_tracker_create(void)
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{
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touch_tracker *t = mzalloc(sizeof(touch_tracker));
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return t;
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}
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void touch_tracker_destroy(touch_tracker *t)
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{
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free(t);
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}
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void touch_tracker_start(touch_tracker *t, touch_event *ev)
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{
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t->distance_abs_x = t->distance_abs_y = 0;
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t->distance_x = t->distance_y = 0;
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t->start_x = ev->x;
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t->start_y = ev->y;
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t->last_x = ev->x;
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t->last_y = ev->y;
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t->prev_x = ev->x;
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t->prev_y = ev->y;
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memcpy(&t->time_start, &ev->time, sizeof(struct timeval));
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}
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void touch_tracker_finish(touch_tracker *t, touch_event *ev)
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{
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t->period = timeval_us_diff(ev->time, t->time_start);
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}
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void touch_tracker_add(touch_tracker *t, touch_event *ev)
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{
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t->prev_x = t->last_x;
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t->prev_y = t->last_y;
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t->distance_x += ev->x - t->last_x;
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t->distance_y += ev->y - t->last_y;
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t->distance_abs_x += iabs(ev->x - t->last_x);
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t->distance_abs_y += iabs(ev->y - t->last_y);
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t->last_x = ev->x;
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t->last_y = ev->y;
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}
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float touch_tracker_get_velocity(touch_tracker *t, int axis)
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{
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if(axis == TRACKER_X)
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return ((((float)t->distance_x) / t->period) * 1000000) / DPI_MUL;
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else
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return ((((float)t->distance_y) / t->period) * 1000000) / DPI_MUL;
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}
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float touch_tracker_get_velocity_abs(touch_tracker *t, int axis)
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{
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if(axis == TRACKER_X)
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return ((((float)t->distance_abs_x) / t->period) * 1000000) / DPI_MUL;
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else
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return ((((float)t->distance_abs_y) / t->period) * 1000000) / DPI_MUL;
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}
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