Opentk/Source/OpenTK/Input/JoystickState.cs

#region License
//
// JoystickState.cs
//
// Author:
//       Stefanos A. <stapostol@gmail.com>
//
// Copyright (c) 2006-2013 Stefanos Apostolopoulos
//
// 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.
//
#endregion

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;

namespace OpenTK.Input
{
    public struct JoystickState
    {
        const int MaxAxes = 10; // JoystickAxis defines 10 axes
        const float ConversionFactor = 1.0f / short.MaxValue;
        unsafe fixed short axes[MaxAxes];
        JoystickButton buttons;

        public float GetAxis(JoystickAxis axis)
        {
            return GetAxis((int)axis);
        }

        public float GetAxis(int axis)
        {
            float value = 0.0f;
            if (axis >= 0 && axis < MaxAxes)
            {
                unsafe
                {
                    fixed (short* paxis = axes)
                    {
                        value = *(paxis + axis) * ConversionFactor;
                    }
                }
            }
            else
            {
                Debug.Print("[Joystick] Invalid axis {0}", axis);
            }
            return value;
        }

        public bool IsButtonDown(JoystickButton button)
        {
            return (buttons & button) != 0;
        }

        public bool IsButtonUp(JoystickButton button)
        {
            return (buttons & button) == 0;
        }
    }
}