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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.geometry.examples.tutorials.bsp;
18  
19  import java.io.File;
20  import java.util.Arrays;
21  
22  import org.apache.commons.geometry.euclidean.twod.Bounds2D;
23  import org.apache.commons.geometry.euclidean.twod.RegionBSPTree2D;
24  import org.apache.commons.geometry.euclidean.twod.Vector2D;
25  import org.apache.commons.geometry.euclidean.twod.path.LinePath;
26  import org.apache.commons.numbers.core.Precision;
27  
28  /** Class containing tutorial code for constructing an unbalanced BSP tree for a hexagon.
29   */
30  public final class HexagonUnbalanced {
31  
32      /** No instantiation. */
33      private HexagonUnbalanced() {}
34  
35      /** Tutorial code entry point.
36       * @param args command arguments; if given, the first argument is used as the location of
37       *      output folder
38       */
39      public static void main(final String[] args) {
40          final File outputFolder = new File(args.length > 0 ? args[0] : ".");
41          final BSPTreeSVGWriter svgWriter = new BSPTreeSVGWriter(Bounds2D.from(Vector2D.of(-8, -8), Vector2D.of(8, 8)));
42          svgWriter.setTreeParentOffsetFactor(0);
43          svgWriter.setTreeParentXOffsetMin(20);
44  
45          final Precision.DoubleEquivalence precision = Precision.doubleEquivalenceOfEpsilon(1e-6);
46  
47          final RegionBSPTree2D tree = RegionBSPTree2D.empty();
48  
49          final LinePath path = LinePath.fromVertexLoop(Arrays.asList(
50                      Vector2D.of(-4, 0),
51                      Vector2D.of(-2, -3),
52                      Vector2D.of(2, -3),
53                      Vector2D.of(4, 0),
54                      Vector2D.of(2, 3),
55                      Vector2D.of(-2, 3)
56                  ), precision);
57          tree.insert(path);
58  
59          svgWriter.write(tree, new File(outputFolder, "hex-unbalanced.svg"));
60      }
61  }