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 computing the xor result of two trees.
29 */
30 public final class BSPTreeXor {
31
32 /** No instantiation. */
33 private BSPTreeXor() {}
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
43 final Precision.DoubleEquivalence precision = Precision.doubleEquivalenceOfEpsilon(1e-6);
44
45 final RegionBSPTree2D result = LinePath.fromVertexLoop(Arrays.asList(
46 Vector2D.of(2, 0),
47 Vector2D.of(-4, 3),
48 Vector2D.of(-4, -3)
49 ), precision).toTree();
50
51 final RegionBSPTree2D other = LinePath.fromVertexLoop(Arrays.asList(
52 Vector2D.of(-2, 0),
53 Vector2D.of(4, -3),
54 Vector2D.of(4, 3)
55 ), precision).toTree();
56
57 result.xor(other);
58
59 svgWriter.write(result, new File(outputFolder, "xor.svg"));
60 }
61 }