| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.sis.referencing.operation.transform; |
| |
| import org.opengis.referencing.operation.Matrix; |
| import org.opengis.referencing.operation.TransformException; |
| |
| import static java.lang.StrictMath.*; |
| |
| |
| /** |
| * A pseudo-transform for debugging purpose. The input points can be random numbers between 0 and 1. |
| * The transformed points are build as below (when formatted in base 10): |
| * |
| * {@preformat text |
| * [1 digit for dimension] [3 first fraction digits] . [original digits from source] |
| * } |
| * |
| * For example if the first input coordinate is (0.2, 0.5, 0.3), then the transformed coordinate will be: |
| * |
| * {@preformat text |
| * 1002.2 |
| * 2005.5 |
| * 3003.3 |
| * } |
| * |
| * This transform is not invertible and can not compute {@linkplain #derivative derivative}. |
| * |
| * @author Martin Desruisseaux (Geomatys) |
| * @version 1.0 |
| * @since 0.5 |
| * @module |
| */ |
| strictfp class PseudoTransform extends AbstractMathTransform { |
| /** |
| * The source and target dimensions. |
| */ |
| protected final int sourceDimension, targetDimension; |
| |
| /** |
| * Temporary buffer for copying the coordinates of a single source point. |
| * Used in order to be compliant with {@link IterationStrategy} contract. |
| */ |
| private final double[] buffer; |
| |
| /** |
| * Creates a transform for the given dimensions. |
| * |
| * @param sourceDimension the source dimension. |
| * @param targetDimension the target dimension. |
| */ |
| public PseudoTransform(final int sourceDimension, final int targetDimension) { |
| this.sourceDimension = sourceDimension; |
| this.targetDimension = targetDimension; |
| this.buffer = new double[sourceDimension]; |
| } |
| |
| /** |
| * Returns the source dimension. |
| */ |
| @Override |
| public int getSourceDimensions() { |
| return sourceDimension; |
| } |
| |
| /** |
| * Returns the target dimension. |
| */ |
| @Override |
| public int getTargetDimensions() { |
| return targetDimension; |
| } |
| |
| /** |
| * Pseudo-transform a point in the given array. |
| * |
| * @throws TransformException should never occurs in this class, |
| * but can occur in method overridden by subclasses. |
| */ |
| @Override |
| public Matrix transform(final double[] srcPts, final int srcOff, |
| final double[] dstPts, final int dstOff, |
| final boolean derivate) throws TransformException |
| { |
| System.arraycopy(srcPts, srcOff, buffer, 0, sourceDimension); |
| for (int i=0; i<targetDimension; i++) { |
| double v = buffer[i % sourceDimension]; |
| v += (i+1)*1000 + round(v * 1000); |
| dstPts[dstOff + i] = v; |
| } |
| return null; |
| } |
| } |