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PlantUML is a component that allows to quickly write : * sequence diagram, * use case diagram, * class diagram, * activity diagram, * component diagram, * state diagram * object diagram
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/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2023, Arnaud Roques
 *
 * Project Info:  http://plantuml.com
 * 
 * If you like this project or if you find it useful, you can support us at:
 * 
 * http://plantuml.com/patreon (only 1$ per month!)
 * http://plantuml.com/paypal
 * 
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 *
 * Original Author:  Arnaud Roques
 * 
 *
 */
package net.sourceforge.plantuml.skin;

import net.sourceforge.plantuml.awt.geom.Dimension2D;

import net.sourceforge.plantuml.Dimension2DDouble;
import net.sourceforge.plantuml.graphic.AbstractTextBlock;
import net.sourceforge.plantuml.graphic.StringBounder;
import net.sourceforge.plantuml.graphic.TextBlock;
import net.sourceforge.plantuml.ugraphic.UGraphic;
import net.sourceforge.plantuml.ugraphic.URectangle;
import net.sourceforge.plantuml.ugraphic.UTranslate;
import net.sourceforge.plantuml.ugraphic.color.HColor;
import net.sourceforge.plantuml.ugraphic.color.HColorNone;

public class Padder {

	private final double margin;
	private final double padding;
	private final HColor backgroundColor;
	private final HColor borderColor;
	private final double roundCorner;

	public static final Padder NONE = new Padder(0, 0, null, null, 0);

	@Override
	public String toString() {
		return "" + margin + "/" + padding + "/" + borderColor + "/" + backgroundColor;
	}

	private Padder(double margin, double padding, HColor backgroundColor, HColor borderColor, double roundCorner) {
		this.margin = margin;
		this.padding = padding;
		this.borderColor = borderColor;
		this.backgroundColor = backgroundColor;
		this.roundCorner = roundCorner;
	}

	public Padder withMargin(double margin) {
		return new Padder(margin, padding, backgroundColor, borderColor, roundCorner);
	}

	public Padder withPadding(double padding) {
		return new Padder(margin, padding, backgroundColor, borderColor, roundCorner);
	}

	public Padder withBackgroundColor(HColor backgroundColor) {
		return new Padder(margin, padding, backgroundColor, borderColor, roundCorner);
	}

	public Padder withBorderColor(HColor borderColor) {
		return new Padder(margin, padding, backgroundColor, borderColor, roundCorner);
	}

	public Padder withRoundCorner(double roundCorner) {
		return new Padder(margin, padding, backgroundColor, borderColor, roundCorner);
	}

	public final double getMargin() {
		return margin;
	}

	public final double getPadding() {
		return padding;
	}

	public final HColor getBackgroundColor() {
		return backgroundColor;
	}

	public final HColor getBorderColor() {
		return borderColor;
	}

	public TextBlock apply(final TextBlock orig) {
		if (this == NONE) {
			return orig;
		}
		return new AbstractTextBlock() {
			public Dimension2D calculateDimension(StringBounder stringBounder) {
				return Dimension2DDouble.delta(orig.calculateDimension(stringBounder), 2 * (margin + padding));
			}

			public void drawU(UGraphic ug) {
				ug = ug.apply(new UTranslate(margin, margin));
				UGraphic ug2 = ug;
				if (borderColor == null) {
					ug2 = ug2.apply(new HColorNone());
				} else {
					ug2 = ug2.apply(borderColor);
				}
				if (backgroundColor == null) {
					ug2 = ug2.apply(new HColorNone().bg());
				} else {
					ug2 = ug2.apply(backgroundColor.bg());
				}
				final Dimension2D originalDim = orig.calculateDimension(ug.getStringBounder());
				final URectangle rect = new URectangle(Dimension2DDouble.delta(originalDim, 2 * padding))
						.rounded(roundCorner);
				ug2.draw(rect);
				orig.drawU(ug.apply(new UTranslate(padding, padding)));
			}
		};
	}
}