ProjectIntersection.cs

    public static bool ProjectIntersection(
        RectangleF r1,
        RectangleF r2,
        Vector2 v1,
        Vector2 v2,
        [MaybeNullWhen(false)]
        out CollisionFrame? frame
    )
    {
        var dv = v1 - v2;
        var (xStart, xEnd) = ProjectLinearIntersection(
            r1.X, r1.Width, r2.X, r2.Width, dv.X
        );

        var (yStart, yEnd) = ProjectLinearIntersection(
            r1.Y, r1.Height, r2.Y, r2.Height, dv.Y
        );

        var start = Math.Max(0.0f, Math.Max(xStart, yStart));
        var end = Math.Min(1.0f, Math.Min(xEnd, yEnd));

        if (start > 1 || end < 0)
        {
            frame = null;
            return false;
        }

        var middle = (start + end) / 2f;

        frame = new(
            new(
                new(
                    r1.X + (v1.X * start), r1.Y + (v1.Y * start), r1.Width, r1.Height
                ),
                new(
                    r2.X + (v2.X * start), r2.Y + (v2.Y * start), r2.Width, r2.Height
                )
            ),
            new(
                new(
                    r1.X + (v1.X * middle), r1.Y + (v1.Y * middle), r1.Width, r1.Height
                ),
                new(
                    r2.X + (v2.X * middle), r2.Y + (v2.Y * middle), r2.Width, r2.Height
                )
            ),
            new(
                new(
                    r1.X + (v1.X * end), r1.Y + (v1.Y * end), r1.Width, r1.Height
                ),
                new(
                    r2.X + (v2.X * end), r2.Y + (v2.Y * end), r2.Width, r2.Height
                )
            )
        );

        return true;
    }

    public static (float Start, float End) ProjectLinearIntersection(
        float aPos, float aWidth, float bPos, float bWidth, float translation
    )
    {
        // Avoid divide by zero problem if objects aren't moving
        var translationInternal = translation == 0 ? 0.0000000001f : translation;

        var start = (bPos - aPos - aWidth) / translationInternal;
        var end = (bPos + bWidth - aPos) / translationInternal;

        return (start, end);
    }