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PlantUML is a component that allows to quickly write diagrams from text.

There is a newer version: 1.2025.0

// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
package net.sourceforge.plantuml.salt.element;

import java.util.ArrayList;
import java.util.List;

import net.sourceforge.plantuml.klimt.UTranslate;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.shape.ULine;
import net.sourceforge.plantuml.klimt.shape.URectangle;

public class Skeleton {

	private final List entries = new ArrayList<>();

	static class Entry {
		private final double xpos;
		private final double ypos;

		public Entry(double x, double y) {
			this.xpos = x;
			this.ypos = y;
		}

		public void drawRectangle(UGraphic ug) {
			ug.apply(new UTranslate(xpos, ypos)).draw(URectangle.build(2, 2));
		}
	}

	public void add(double x, double y) {
		entries.add(new Entry(x, y));
	}

	public void draw(UGraphic ug, double x, double y) {
		for (int i = 0; i < entries.size(); i++) {
			final Entry en = entries.get(i);
			if (i + 1 < entries.size() && entries.get(i + 1).xpos > en.xpos) {
				en.drawRectangle(ug);
			}
			Entry parent = null;
			for (int j = 0; j < i; j++) {
				final Entry en0 = entries.get(j);
				if (en0.xpos < en.xpos) {
					parent = en0;
				}
			}
			if (parent != null) {
				drawChild(ug, parent, en);
			}
		}
	}

	private void drawChild(UGraphic ug, Entry parent, Entry child) {
		final double dy = child.ypos - parent.ypos - 2;
		ug.apply(new UTranslate(parent.xpos + 1, parent.ypos + 3)).draw(ULine.vline(dy));

		final double dx = child.xpos - parent.xpos - 2;
		ug.apply(new UTranslate(parent.xpos + 1, child.ypos + 1)).draw(ULine.hline(dx));

	}

}