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       1                 :            : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2                 :            : /*
       3                 :            :  * This file is part of the LibreOffice project.
       4                 :            :  *
       5                 :            :  * This Source Code Form is subject to the terms of the Mozilla Public
       6                 :            :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7                 :            :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8                 :            :  *
       9                 :            :  * This file incorporates work covered by the following license notice:
      10                 :            :  *
      11                 :            :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12                 :            :  *   contributor license agreements. See the NOTICE file distributed
      13                 :            :  *   with this work for additional information regarding copyright
      14                 :            :  *   ownership. The ASF licenses this file to you under the Apache
      15                 :            :  *   License, Version 2.0 (the "License"); you may not use this file
      16                 :            :  *   except in compliance with the License. You may obtain a copy of
      17                 :            :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18                 :            :  */
      19                 :            : 
      20                 :            : #ifndef _BGFX_TOOLS_LERP_HXX
      21                 :            : #define _BGFX_TOOLS_LERP_HXX
      22                 :            : 
      23                 :            : #include <sal/types.h>
      24                 :            : 
      25                 :            : namespace basegfx
      26                 :            : {
      27                 :            :     namespace tools
      28                 :            :     {
      29                 :            :         /** Generic linear interpolator
      30                 :            : 
      31                 :            :             @tpl ValueType
      32                 :            :             Must have operator+ and operator* defined, and should
      33                 :            :             have value semantics.
      34                 :            : 
      35                 :            :             @param t
      36                 :            :             As usual, t must be in the [0,1] range
      37                 :            :         */
      38                 :          0 :         template< typename ValueType > ValueType lerp( const ValueType&     rFrom,
      39                 :            :                                                        const ValueType&     rTo,
      40                 :            :                                                        double               t )
      41                 :            :         {
      42                 :            :             // This is only to suppress a double->int warning. All other
      43                 :            :             // types should be okay here.
      44                 :          0 :             return static_cast<ValueType>( (1.0-t)*rFrom + t*rTo );
      45                 :            :         }
      46                 :            :     }
      47                 :            : }
      48                 :            : 
      49                 :            : #endif /* _BGFX_TOOLS_LERP_HXX */
      50                 :            : 
      51                 :            : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */