79 lines
2.1 KiB
C#
Executable File
79 lines
2.1 KiB
C#
Executable File
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace OpenRa.Game.Traits
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{
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static class Util
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{
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public static void TickFacing( ref int facing, int desiredFacing, int rot )
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{
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var leftTurn = ( facing - desiredFacing ) & 0xFF;
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var rightTurn = ( desiredFacing - facing ) & 0xFF;
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if( Math.Min( leftTurn, rightTurn ) < rot )
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facing = desiredFacing & 0xFF;
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else if( rightTurn < leftTurn )
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facing = ( facing + rot ) & 0xFF;
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else
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facing = ( facing - rot ) & 0xFF;
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}
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static float2[] fvecs = Graphics.Util.MakeArray<float2>( 32,
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i => -float2.FromAngle( i / 16.0f * (float)Math.PI ) * new float2( 1f, 1.3f ) );
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public static int GetFacing( float2 d, int currentFacing )
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{
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if( float2.WithinEpsilon( d, float2.Zero, 0.001f ) )
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return currentFacing;
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int highest = -1;
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float highestDot = -1.0f;
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for( int i = 0 ; i < fvecs.Length ; i++ )
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{
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float dot = float2.Dot( fvecs[ i ], d );
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if( dot > highestDot )
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{
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highestDot = dot;
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highest = i;
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}
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}
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return highest * 8;
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}
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public static int GetNearestFacing( int facing, int desiredFacing )
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{
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var turn = desiredFacing - facing;
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if( turn > 128 )
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turn -= 256;
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if( turn < -128 )
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turn += 256;
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return facing + turn;
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}
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public static int2 GetTurretPosition(Actor self, int[] offset)
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{
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var ru = self.traits.WithInterface<RenderUnit>().FirstOrDefault();
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if (ru == null) return int2.Zero; /* things that don't have a rotating base don't need the turrets repositioned */
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var bodyFacing = self.traits.Get<Mobile>().facing;
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var quantizedFacing = bodyFacing - bodyFacing % ru.anim.CurrentSequence.Length;
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var angle = (quantizedFacing / 256f) * (2 * (float)Math.PI);
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var sinAngle = Math.Sin(angle);
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var cosAngle = Math.Cos(angle);
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var pos = new int2(
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(int)(cosAngle * offset[0] + sinAngle * offset[1]),
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(int)(cosAngle * offset[1] - sinAngle * offset[0]));
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pos.Y = (int)(.7f * pos.Y);
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return pos;
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}
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}
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}
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