1 // checkerboard.h 2 // 3 // Copyright (C) 2003, 2004 Jason Bevins 4 // 5 // This library is free software; you can redistribute it and/or modify it 6 // under the terms of the GNU Lesser General Public License as published by 7 // the Free Software Foundation; either version 2.1 of the License, or (at 8 // your option) any later version. 9 // 10 // This library is distributed in the hope that it will be useful, but WITHOUT 11 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 13 // License (COPYING.txt) for more details. 14 // 15 // You should have received a copy of the GNU Lesser General Public License 16 // along with this library; if not, write to the Free Software Foundation, 17 // Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 // 19 // The developer's email is jlbezigvins@gmzigail.com (for great email, take 20 // off every 'zig'.) 21 // 22 module noise.mod.checkerboard; 23 24 private { 25 import noise.mod.modulebase; 26 } 27 28 /// @addtogroup libnoise 29 /// @{ 30 31 /// @addtogroup modules 32 /// @{ 33 34 /// @addtogroup generatormodules 35 /// @{ 36 37 /// Noise module that outputs a checkerboard pattern. 38 /// 39 /// @image html modulecheckerboard.png 40 /// 41 /// This noise module outputs unit-sized blocks of alternating values. 42 /// The values of these blocks alternate between -1.0 and +1.0. 43 /// 44 /// This noise module is not really useful by itself, but it is often used 45 /// for debugging purposes. 46 /// 47 /// This noise module does not require any source modules. 48 class Checkerboard: Mod 49 { 50 51 public: 52 53 /// Constructor. 54 this () 55 { 56 super(this.GetSourceModCount()); 57 } 58 59 override int GetSourceModCount () const 60 { 61 return 0; 62 } 63 64 override double GetValue (double x, double y, double z) const 65 { 66 int ix = cast(int)(floor (MakeInt32Range (x))); 67 int iy = cast(int)(floor (MakeInt32Range (y))); 68 int iz = cast(int)(floor (MakeInt32Range (z))); 69 return (ix & 1 ^ iy & 1 ^ iz & 1)? -1.0: 1.0; 70 } 71 72 }; 73 74 /// @} 75 76 /// @} 77 78 /// @}