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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
package net.sourceforge.plantuml.salt.element;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import net.sourceforge.plantuml.StringUtils;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.font.StringBounder;
import net.sourceforge.plantuml.klimt.font.UFont;
import net.sourceforge.plantuml.klimt.geom.XDimension2D;
import net.sourceforge.plantuml.style.ISkinSimple;

public class ElementTree extends AbstractElement {

	private final List entries = new ArrayList<>();
	private final UFont font;
	private final ISkinSimple spriteContainer;
	private final double margin = 10;
	private final TableStrategy strategy;

	public ElementTree(UFont font, ISkinSimple spriteContainer, TableStrategy strategy) {
		this.font = font;
		this.spriteContainer = spriteContainer;
		this.strategy = strategy;
	}

	public void addEntry(String s) {
		int level = 0;
		while (s.startsWith("+")) {
			level++;
			s = s.substring(1);
		}
		final Element elmt = new ElementText(Arrays.asList(StringUtils.trin(s)), font, spriteContainer);
		entries.add(new ElementTreeEntry(level, elmt));
	}

	public void addCellToEntry(String s) {
		final int size = entries.size();
		if (size > 0) {
			final Element elmt = new ElementText(Arrays.asList(StringUtils.trin(s)), font, spriteContainer);
			entries.get(size - 1).addCell(elmt);
		}
	}

	public XDimension2D getPreferredDimension(StringBounder stringBounder, double x, double y) {
		double w1 = 0;
		double h = 0;
		for (ElementTreeEntry entry : entries) {
			final XDimension2D dim1 = entry.getPreferredDimensionFirstCell(stringBounder);
			w1 = Math.max(w1, dim1.getWidth());
			h += dim1.getHeight();
		}
		double w2 = getWidthOther(stringBounder).getTotalWidthWithMargin(margin);
		if (w2 > 0) {
			w2 += margin;
		}
		return new XDimension2D(w1 + w2 + 2, h);
	}

	private ListWidth getWidthOther(StringBounder stringBounder) {
		ListWidth merge = new ListWidth();
		for (ElementTreeEntry entry : entries) {
			final ListWidth dim2 = entry.getPreferredDimensionOtherCell(stringBounder);
			merge = merge.mergeMax(dim2);
		}
		return merge;
	}

	private double getWidth1(StringBounder stringBounder) {
		double w1 = 0;
		for (ElementTreeEntry entry : entries) {
			final XDimension2D dim1 = entry.getPreferredDimensionFirstCell(stringBounder);
			w1 = Math.max(w1, dim1.getWidth());
		}
		return w1;
	}

	public void drawU(UGraphic ug, int zIndex, XDimension2D dimToUse) {
		if (zIndex != 0)
			return;

		ug = ug.apply(getBlack());

		final StringBounder stringBounder = ug.getStringBounder();
		final double w1 = getWidth1(stringBounder);
		final ListWidth otherWidth = getWidthOther(stringBounder);
		final Skeleton skeleton = new Skeleton();
		double yvar = 0;
		final List rows = new ArrayList<>();
		final List cols = new ArrayList<>();
		rows.add(yvar);
		double xvar = 0;
		cols.add(xvar);
		xvar += w1 + margin / 2;
		cols.add(xvar);
		for (final Iterator it = otherWidth.iterator(); it.hasNext();) {
			xvar += it.next() + margin;
			cols.add(xvar);
		}

		for (ElementTreeEntry entry : entries) {
			entry.drawFirstCell(ug, 0, yvar);
			entry.drawSecondCell(ug, w1 + margin, yvar, otherWidth, margin);
			final double h = entry.getPreferredDimensionFirstCell(stringBounder).getHeight();
			skeleton.add(entry.getXDelta() - 7, yvar + h / 2 - 1);
			yvar += h;
			rows.add(yvar);
		}
		ug = ug.apply(getColor88());
		skeleton.draw(ug, 0, 0);
		if (strategy != TableStrategy.DRAW_NONE) {
			final Grid2 grid = new Grid2(rows, cols, strategy);
			grid.drawU(ug);
		}
	}

}