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17 package org.apache.commons.geometry.examples.tutorials.bsp;
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19 import java.io.File;
20 import java.util.Arrays;
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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;
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30 public final class BSPTreeUnion {
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32
33 private BSPTreeUnion() {}
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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);
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45 final RegionBSPTree2D a = LinePath.fromVertexLoop(Arrays.asList(
46 Vector2D.of(2, 0),
47 Vector2D.of(-4, 3),
48 Vector2D.of(-4, -3)
49 ), precision).toTree();
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51 final RegionBSPTree2D b = LinePath.fromVertexLoop(Arrays.asList(
52 Vector2D.of(-2, 0),
53 Vector2D.of(4, -3),
54 Vector2D.of(4, 3)
55 ), precision).toTree();
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57 final RegionBSPTree2D result = RegionBSPTree2D.empty();
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59 result.union(a, b);
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61 svgWriter.write(result, new File(outputFolder, "union.svg"));
62 }
63 }