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}