66 lines
2.3 KiB
C#
66 lines
2.3 KiB
C#
#region license
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// This file is part of Vocaluxe.
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//
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// Vocaluxe 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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// Vocaluxe 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 Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
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#endregion
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using System.Diagnostics;
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namespace VocaluxeLib
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{
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public class CFading
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{
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private readonly float _FromValue;
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private readonly float _ToValue;
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private readonly float _Duration; //in ms
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private readonly Stopwatch _Timer = new Stopwatch();
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/// <summary>
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/// Starts a fading process adjusting between 2 values over a given amount of time
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/// </summary>
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/// <param name="fromValue">Start value</param>
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/// <param name="toValue">Target value</param>
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/// <param name="duration">Duration of the fading in seconds</param>
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public CFading(float fromValue, float toValue, float duration)
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{
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if (duration < 0)
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duration = 0;
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_FromValue = fromValue;
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_ToValue = toValue;
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_Duration = duration * 1000f;
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_Timer.Start();
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}
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/// <summary>
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/// Gets the current value and sets finished
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/// </summary>
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/// <param name="finished">Set to whether fading has finished</param>
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/// <returns>Current value (between from and to values)</returns>
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public float GetValue(out bool finished)
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{
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float result;
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if (_Timer.ElapsedMilliseconds < _Duration)
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{
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result = (_Timer.ElapsedMilliseconds / _Duration) * (_ToValue - _FromValue) + _FromValue;
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finished = false;
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}
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else
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{
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result = _ToValue;
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finished = true;
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}
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return result;
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}
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}
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} |