48 lines
2.2 KiB
C#
48 lines
2.2 KiB
C#
using Syntriax.Engine.Core;
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using Syntriax.Engine.Core.Abstract;
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namespace Syntriax.Engine.Physics2D.Primitives;
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[System.Diagnostics.DebuggerDisplay("Center: {Center.ToString(), nq}, Radius: {Radius}")]
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public readonly struct Circle(Vector2D Center, float Radius)
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{
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public static readonly Circle UnitCircle = new(Vector2D.Zero, 1f);
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public readonly Vector2D Center { get; init; } = Center;
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public readonly float Radius { get; init; } = Radius;
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public readonly float RadiusSquared => Radius * Radius;
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public readonly float Diameter => 2f * Radius;
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public static Circle SetCenter(Circle circle, Vector2D center) => new(center, circle.Radius);
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public static Circle SetRadius(Circle circle, float radius) => new(circle.Center, radius);
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public static Circle Displace(Circle circle, Vector2D displaceVector) => new(circle.Center + displaceVector, circle.Radius);
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public static Projection Project(Circle circle, Vector2D projectionVector)
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{
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float projectedCenter = circle.Center.Dot(projectionVector);
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return new(projectedCenter - circle.Radius, projectedCenter + circle.Radius);
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}
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public static Circle TransformCircle(ITransform transform, Circle circle)
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=> new(transform.TransformVector2D(circle.Center), circle.Radius * transform.Scale.Magnitude);
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public static bool ApproximatelyEquals(Circle left, Circle right)
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=> left.Center.ApproximatelyEquals(right.Center) && left.Radius.ApproximatelyEquals(right.Radius);
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}
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public static class CircleExtensions
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{
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public static Circle SetCenter(this Circle circle, Vector2D center) => Circle.SetCenter(circle, center);
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public static Circle SetRadius(this Circle circle, float radius) => Circle.SetRadius(circle, radius);
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public static Circle Displace(this Circle circle, Vector2D displaceVector) => Circle.Displace(circle, displaceVector);
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public static Projection ToProjection(this Circle circle, Vector2D projectionVector) => Circle.Project(circle, projectionVector);
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public static Circle TransformCircle(this ITransform transform, Circle circle) => Circle.TransformCircle(transform, circle);
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public static bool ApproximatelyEquals(this Circle left, Circle right) => Circle.ApproximatelyEquals(left, right);
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}
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