//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="Vector.GetAngle"
// Project: StgSharp
// AuthorGroup: Nitload
// Copyright (c) Nitload. All rights reserved.
//     
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//     
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
using StgSharp.Mathematics.Graphics;

namespace StgSharp.Mathematics.Graphics
{
    public static unsafe partial class Linear
    {

        public static float GetAngle(
                            Vec2 vec1,
                            Vec2 vec2
        )
        {
            return MathF.Acos(
                1 / (vec1.GetLength() * vec2.GetLength()));
        }

        public static float GetAngle(
                            Vec3 vec1,
                            Vec3 vec2
        )
        {
            return MathF.Acos(vec1 * vec2 / (vec1.GetLength() * vec2.GetLength()));
        }

    }
}