001 /* 002 * 003 004 Licensed under the Apache License, Version 2.0 (the "License"); 005 you may not use this file except in compliance with the License. 006 You may obtain a copy of the License at 007 008 http://www.apache.org/licenses/LICENSE-2.0 009 010 Unless required by applicable law or agreed to in writing, software 011 distributed under the License is distributed on an "AS IS" BASIS, 012 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 See the License for the specific language governing permissions and 014 limitations under the License. 015 */ 016 017 package railo.runtime.img.math; 018 019 public 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 }