70 lines
2.7 KiB
C#
70 lines
2.7 KiB
C#
// <copyright file="DirectionExtensions.cs" company="MUnique">
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// Licensed under the MIT License. See LICENSE file in the project root for full license information.
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// </copyright>
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namespace MUnique.OpenMU.GameLogic;
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using MUnique.OpenMU.Pathfinding;
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/// <summary>
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/// Extension methods which have to do with handling <see cref="Direction"/>s.
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/// </summary>
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public static class DirectionExtensions
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{
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/// <summary>
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/// Calculates the target point based on the origin and the specified direction.
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/// </summary>
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/// <param name="origin">From point.</param>
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/// <param name="direction">The direction.</param>
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/// <returns>The target point based on the origin and the specified direction.</returns>
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/// <exception cref="ArgumentException">direction.</exception>
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public static Point CalculateTargetPoint(this Point origin, Direction direction)
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{
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return direction switch
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{
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Direction.Undefined => origin,
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Direction.North => new Point((byte)(origin.X - 1), (byte)(origin.Y + 1)),
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Direction.South => new Point((byte)(origin.X + 1), (byte)(origin.Y - 1)),
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Direction.East => new Point((byte)(origin.X + 1), (byte)(origin.Y + 1)),
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Direction.West => new Point((byte)(origin.X - 1), (byte)(origin.Y - 1)),
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Direction.NorthEast => new Point(origin.X, (byte)(origin.Y + 1)),
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Direction.NorthWest => new Point((byte)(origin.X - 1), origin.Y),
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Direction.SouthEast => new Point((byte)(origin.X + 1), origin.Y),
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Direction.SouthWest => new Point(origin.X, (byte)(origin.Y - 1)),
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_ => throw new ArgumentException($"Direction value {direction} is not defined", nameof(direction)),
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};
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}
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/// <summary>
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/// Gets the direction from one point to another.
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/// </summary>
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/// <param name="from">The origin point.</param>
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/// <param name="to">The target point.</param>
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/// <returns>The direction from the origin to the target.</returns>
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public static Direction GetDirectionTo(this Point from, Point to)
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{
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if (from == to)
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{
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return Direction.Undefined;
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}
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double angle = Math.Atan2(to.Y - from.Y, to.X - from.X);
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angle += Math.PI;
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angle /= Math.PI / 4;
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int halfQuarter = Convert.ToInt32(angle);
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halfQuarter %= 8;
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return halfQuarter switch
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{
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7 => Direction.North,
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0 => Direction.NorthWest,
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1 => Direction.West,
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2 => Direction.SouthWest,
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3 => Direction.South,
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4 => Direction.SouthEast,
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5 => Direction.East,
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6 => Direction.NorthEast,
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_ => Direction.Undefined,
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};
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}
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} |