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 MarbleFunction extends CompoundFunction2D {
020            
021            public MarbleFunction() {
022                    super(new TurbulenceFunction(new Noise(), 6));
023            }
024            
025            public MarbleFunction(Function2D basis) {
026                    super(basis);
027            }
028            
029            public float evaluate(float x, float y) {
030                    return (float)Math.pow(0.5 * (Math.sin(8. * basis.evaluate(x, y)) + 1), 0.77);
031            }
032    
033    }