73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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->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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memcpy(&v->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->distance_x = ev->x - t->start_x;
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t->distance_y = ev->y - t->start_y;
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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->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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