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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: */