49 lines
1.6 KiB
Java
49 lines
1.6 KiB
Java
/* Copyright (C) 2023-2024 José Rebelo
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This file is part of Gadgetbridge.
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Gadgetbridge is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published
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by 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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Gadgetbridge 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 Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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package nodomain.freeyourgadget.gadgetbridge.activities.charts;
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/**
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* Awkward class that helps in translating long timestamp
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* values to float (sic!) values. It basically rebases all
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* timestamps to a base (the very first) timestamp value.
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* <p>
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* It does this so that the large timestamp values can be used
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* floating point values, where the mantissa is just 24 bits.
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*/
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public class TimestampTranslation {
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private int tsOffset = -1;
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public int shorten(int timestamp) {
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if (tsOffset == -1) {
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tsOffset = timestamp;
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return 0;
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}
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return timestamp - tsOffset;
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}
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public int toOriginalValue(int timestamp) {
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if (tsOffset == -1) {
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return timestamp;
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}
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return timestamp + tsOffset;
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}
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public void reset() {
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tsOffset = -1;
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}
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}
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