52 lines
1.4 KiB
C#
52 lines
1.4 KiB
C#
#region Copyright & License Information
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/*
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* Copyright (c) The OpenRA Developers and Contributors
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version. For more
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* information, see COPYING.
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*/
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#endregion
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using System;
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namespace OpenRA.Mods.Common.Widgets
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{
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public class ExponentialSliderWidget : SliderWidget
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{
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// Values are according to https://www.dr-lex.be/info-stuff/volumecontrols.html
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public double ExpA = 1.0e-3;
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public double ExpB = 6.908;
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public ExponentialSliderWidget()
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: base() { }
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public ExponentialSliderWidget(ExponentialSliderWidget other)
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: base(other) { }
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float ExpFromLinear(float x)
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{
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if (x <= 0)
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return 0;
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return (float)(ExpA * Math.Exp(ExpB * x)).Clamp(0.0, 1.0);
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}
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float LinearFromExp(float x)
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{
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return (float)(Math.Log(x / ExpA) / ExpB).Clamp(0.0, 1.0);
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}
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protected override float ValueFromPx(int x)
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{
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return MinimumValue + (MaximumValue - MinimumValue) * ExpFromLinear((x - 0.5f * RenderBounds.Height) / (RenderBounds.Width - RenderBounds.Height));
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}
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protected override int PxFromValue(float x)
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{
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return (int)(0.5f * RenderBounds.Height + (RenderBounds.Width - RenderBounds.Height) * LinearFromExp((x - MinimumValue) / (MaximumValue - MinimumValue)));
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}
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}
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}
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