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 VLNoise implements Function2D {
020    
021            private float distortion = 10.0f;
022    
023            public void setDistortion(float distortion) {
024                    this.distortion = distortion;
025            }
026    
027            public float getDistortion() {
028                    return distortion;
029            }
030    
031            public float evaluate(float x, float y) {
032                    float ox = Noise.noise2(x+0.5f, y) * distortion;
033                    float oy = Noise.noise2(x, y+0.5f) * distortion;
034                    return Noise.noise2(x+ox, y+oy);
035            }
036    
037    }