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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.partitioning.bsp.RegionCutRule;
23 import org.apache.commons.geometry.euclidean.twod.Bounds2D;
24 import org.apache.commons.geometry.euclidean.twod.Lines;
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 import org.apache.commons.numbers.core.Precision;
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32
33 public final class HexagonStructuralCut {
34
35
36 private HexagonStructuralCut() {}
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42 public static void main(final String[] args) {
43 final File outputFolder = new File(args.length > 0 ? args[0] : ".");
44 final BSPTreeSVGWriter svgWriter = new BSPTreeSVGWriter(Bounds2D.from(Vector2D.of(-8, -8), Vector2D.of(8, 8)));
45
46 final Precision.DoubleEquivalence precision = Precision.doubleEquivalenceOfEpsilon(1e-6);
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48 final RegionBSPTree2D tree = RegionBSPTree2D.empty();
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50 tree.insert(Lines.fromPointAndDirection(Vector2D.ZERO, Vector2D.Unit.PLUS_X, precision).span(),
51 RegionCutRule.INHERIT);
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53 svgWriter.write(tree, new File(outputFolder, "hex-struct-0.svg"));
54
55 final LinePath path = LinePath.fromVertexLoop(Arrays.asList(
56 Vector2D.of(-4, 0),
57 Vector2D.of(-2, -3),
58 Vector2D.of(2, -3),
59 Vector2D.of(4, 0),
60 Vector2D.of(2, 3),
61 Vector2D.of(-2, 3)
62 ), precision);
63 tree.insert(path);
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65 svgWriter.write(tree, new File(outputFolder, "hex-struct-1.svg"));
66 }
67 }