001/* 002Copyright 2006 Jerry Huxtable 003 004Licensed under the Apache License, Version 2.0 (the "License"); 005you may not use this file except in compliance with the License. 006You may obtain a copy of the License at 007 008 http://www.apache.org/licenses/LICENSE-2.0 009 010Unless required by applicable law or agreed to in writing, software 011distributed under the License is distributed on an "AS IS" BASIS, 012WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013See the License for the specific language governing permissions and 014limitations under the License. 015*/ 016 017package com.jhlabs.math; 018 019public class TurbulenceFunction extends CompoundFunction2D { 020 021 private float octaves; 022 023 public TurbulenceFunction(Function2D basis, float octaves) { 024 super(basis); 025 this.octaves = octaves; 026 } 027 028 public void setOctaves(float octaves) { 029 this.octaves = octaves; 030 } 031 032 public float getOctaves() { 033 return octaves; 034 } 035 036 public float evaluate(float x, float y) { 037 float t = 0.0f; 038 039 for (float f = 1.0f; f <= octaves; f *= 2) 040 t += Math.abs(basis.evaluate(f * x, f * y)) / f; 041 return t; 042 } 043 044}