boofcv.core.image.border.BorderIndex1D_Reflect Maven / Gradle / Ivy

/*
 * Copyright (c) 2011-2013, Peter Abeles. All Rights Reserved.
 *
 * This file is part of BoofCV (http://boofcv.org).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package boofcv.core.image.border;


/**
 * 
 * Access to outside the array are reflected back into the array around the closest border.  This
 * is an even symmetric function, e.g. f(-1) = f(1) = 1, f(-2) = f(2) = 2.
 * 
 *
 * @author Peter Abeles
 */
public class BorderIndex1D_Reflect extends BorderIndex1D{
	@Override
	public int getIndex(int index) {
		if( index < 0 )
			return -index;
		else if( index >= length)
			return length-2-(index-length);
		else
			return index;
	}
}