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feat: Circle & Shape Projections

This commit is contained in:
Syntriax 2024-01-26 12:41:51 +03:00
parent dfcc877e58
commit f980546d37
2 changed files with 35 additions and 0 deletions
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8
Engine.Physics2D/Primitives/Circle.cs
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@ -13,6 +13,12 @@ public record Circle(Vector2D Center, float Radius)
public static Circle Displace(Circle circle, Vector2D displaceVector) => new(circle.Center + displaceVector, circle.Radius);
public static Projection Project(Circle circle, Vector2D projectionVector)
{
float projectedCenter = circle.Center.Dot(projectionVector);
return new(projectedCenter - circle.Radius, projectedCenter + circle.Radius);
}
public static Circle TransformCircle(ITransform transform, Circle circle)
=> new(transform.TransformVector2D(circle.Center), circle.Radius * transform.Scale.Magnitude);
@ -27,6 +33,8 @@ public static class CircleExtensions
public static Circle Displace(this Circle circle, Vector2D displaceVector) => Circle.Displace(circle, displaceVector);
public static Projection ToProjection(this Circle circle, Vector2D projectionVector) => Circle.Project(circle, projectionVector);
public static Circle TransformCircle(this ITransform transform, Circle circle) => Circle.TransformCircle(transform, circle);
public static bool ApproximatelyEquals(this Circle left, Circle right) => Circle.ApproximatelyEquals(left, right);

27
Engine.Physics2D/Primitives/Shape.cs
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@ -53,6 +53,30 @@ public record Shape(IList<Vector2D> Vertices) : IEnumerable<Vector2D>
return lines;
}
public static void Project(Shape shape, Vector2D projectionVector, IList<float> list)
{
list.Clear();
int count = shape.Vertices.Count;
for (int i = 0; i < count; i++)
list.Add(projectionVector.Dot(shape[i]));
}
public static Projection Project(Shape shape, Vector2D projectionVector)
{
float min = float.MaxValue;
float max = float.MinValue;
foreach (var vertex in shape)
{
float projectedLength = projectionVector.Dot(vertex);
min = Math.Min(projectedLength, min);
max = Math.Max(projectedLength, max);
}
return new(min, max);
}
public static Shape TransformShape(Shape shape, ITransform transform)
{
List<Vector2D> vertices = new(shape.Vertices.Count);
@ -96,6 +120,9 @@ public static class ShapeExtensions
public static void ToLines(this Shape shape, IList<Line> lines) => Shape.GetLines(shape, lines);
public static List<Line> ToLines(this Shape shape) => Shape.GetLines(shape);
public static void ToProjection(this Shape shape, Vector2D projectionVector, IList<float> list) => Shape.Project(shape, projectionVector, list);
public static Projection ToProjection(this Shape shape, Vector2D projectionVector) => Shape.Project(shape, projectionVector);
public static Shape TransformShape(this ITransform transform, Shape shape) => Shape.TransformShape(shape, transform);
public static void TransformShape(this ITransform transform, Shape from, ref Shape to) => Shape.TransformShape(from, transform, ref to);