83 lines
2.8 KiB
C#
83 lines
2.8 KiB
C#
using System;
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#if UNITY_5_3_OR_NEWER
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using Vector3Float = UnityEngine.Vector3;
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#endif
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namespace LinearAlgebra
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{
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/// <summary>
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/// A direction in 3D space
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/// </summary>
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/// A direction is represented using two angles:
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/// * The horizontal angle ranging from -180 (inclusive) to 180 (exclusive)
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/// degrees which is a rotation in the horizontal plane
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/// * A vertical angle ranging from -90 (inclusive) to 90 (exclusive) degrees
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/// which is the rotation in the up/down direction applied after the horizontal
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/// rotation has been applied.
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/// The angles are automatically normalized to stay within the abovenmentioned
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/// ranges.
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public class Direction {
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public float horizontal;
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public float vertical;
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public Direction() {
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horizontal = 0;
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vertical = 0;
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}
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// public Direction(float horizontal, float vertical) {
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// this.horizontal = horizontal;
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// this.vertical = vertical;
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// //Normalize();
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// }
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public static Direction Degrees(float horizontal, float vertical) {
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Direction d = new() {
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horizontal = horizontal,
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vertical = vertical
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};
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//Normalize();
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return d;
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}
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public static Direction Radians(float horizontal, float vertical) {
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Direction d = new() {
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horizontal = horizontal * Angle.Rad2Deg,
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vertical = vertical * Angle.Rad2Deg
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};
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//Normalize();
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return d;
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}
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public readonly static Direction forward = Degrees(0, 0);
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public readonly static Direction backward = Degrees(-180, 0);
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public readonly static Direction up = Degrees(0, 90);
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public readonly static Direction down = Degrees(0, -90);
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public readonly static Direction left = Degrees(-90, 0);
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public readonly static Direction right = Degrees(90, 0);
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public void Normalize() {
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if (this.vertical > 90 || this.vertical < -90) {
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this.horizontal += 180;
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this.vertical = 180 - this.vertical;
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}
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}
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public Vector3Float ToVector3()
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{
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float verticalRad = (Angle.pi / 2) - this.vertical * Angle.Deg2Rad;
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float horizontalRad = this.horizontal * Angle.Deg2Rad;
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float cosVertical = (float)Math.Cos(verticalRad);
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float sinVertical = (float)Math.Sin(verticalRad);
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float cosHorizontal = (float)Math.Cos(horizontalRad);
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float sinHorizontal = (float)Math.Sin(horizontalRad);
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float x = sinVertical * sinHorizontal;
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float y = cosVertical;
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float z = sinVertical * cosHorizontal;
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Vector3Float v = new(x, y, z);
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return v;
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}
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}
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} |