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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.core.precision.DoublePrecisionContext;
23  import org.apache.commons.geometry.core.precision.EpsilonDoublePrecisionContext;
24  import org.apache.commons.geometry.euclidean.twod.Bounds2D;
25  import org.apache.commons.geometry.euclidean.twod.RegionBSPTree2D;
26  import org.apache.commons.geometry.euclidean.twod.Vector2D;
27  import org.apache.commons.geometry.euclidean.twod.path.LinePath;
28  
29  /** Class containing tutorial code for constructing an unbalanced BSP tree for a hexagon.
30   */
31  public final class HexagonUnbalanced {
32  
33      /** No instantiation. */
34      private HexagonUnbalanced() {}
35  
36      /** Tutorial code entry point.
37       * @param args command arguments; if given, the first argument is used as the location of
38       *      output folder
39       */
40      public static void main(String[] args) {
41          File outputFolder = new File(args.length > 0 ? args[0] : ".");
42          BSPTreeSVGWriter svgWriter = new BSPTreeSVGWriter(Bounds2D.from(Vector2D.of(-8, -8), Vector2D.of(8, 8)));
43          svgWriter.setTreeParentOffsetFactor(0);
44          svgWriter.setTreeParentXOffsetMin(20);
45  
46          DoublePrecisionContext precision = new EpsilonDoublePrecisionContext(1e-6);
47  
48          RegionBSPTree2D tree = RegionBSPTree2D.empty();
49  
50          LinePath path = LinePath.fromVertexLoop(Arrays.asList(
51                      Vector2D.of(-4, 0),
52                      Vector2D.of(-2, -3),
53                      Vector2D.of(2, -3),
54                      Vector2D.of(4, 0),
55                      Vector2D.of(2, 3),
56                      Vector2D.of(-2, 3)
57                  ), precision);
58          tree.insert(path);
59  
60          svgWriter.write(tree, new File(outputFolder, "hex-unbalanced.svg"));
61      }
62  }