68 lines
1.7 KiB
C#
68 lines
1.7 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
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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. For more information,
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* see COPYING.
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using OpenRA.Graphics;
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namespace OpenRA.Traits
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{
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public class ScreenShakerInfo : TraitInfo<ScreenShaker> { }
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public class ScreenShaker : ITick, IWorldLoaded
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{
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WorldRenderer worldRenderer;
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List<ShakeEffect> shakeEffects = new List<ShakeEffect>();
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int ticks = 0;
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public void WorldLoaded(World w, WorldRenderer wr) { worldRenderer = wr; }
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public void Tick(Actor self)
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{
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if (shakeEffects.Any())
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{
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worldRenderer.Viewport.Scroll(GetScrollOffset(), true);
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shakeEffects.RemoveAll(t => t.ExpiryTime == ticks);
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}
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ticks++;
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}
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public void AddEffect(int time, WPos position, int intensity)
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{
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shakeEffects.Add(new ShakeEffect { ExpiryTime = ticks + time, Position = position, Intensity = intensity });
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}
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float2 GetScrollOffset()
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{
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return GetIntensity() * new float2(
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(float)Math.Sin((ticks * 2 * Math.PI) / 4),
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(float)Math.Cos((ticks * 2 * Math.PI) / 5));
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}
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float GetIntensity()
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{
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var cp = worldRenderer.Position(worldRenderer.Viewport.CenterLocation);
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var intensity = 100 * 1024 * 1024 * shakeEffects.Sum(
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e => (float)e.Intensity / (e.Position - cp).LengthSquared);
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return Math.Min(intensity, 10);
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}
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}
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struct ShakeEffect
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{
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public int ExpiryTime;
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public WPos Position;
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public int Intensity;
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}
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}
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