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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.ugraphic.g2d;

import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Objects;
import java.util.Set;

import net.sourceforge.plantuml.EnsureVisible;
import net.sourceforge.plantuml.Url;
import net.sourceforge.plantuml.anim.AffineTransformation;
import net.sourceforge.plantuml.graphic.StringBounder;
import net.sourceforge.plantuml.png.PngIO;
import net.sourceforge.plantuml.posimo.DotPath;
import net.sourceforge.plantuml.security.SecurityUtils;
import net.sourceforge.plantuml.ugraphic.AbstractCommonUGraphic;
import net.sourceforge.plantuml.ugraphic.AbstractUGraphic;
import net.sourceforge.plantuml.ugraphic.UAntiAliasing;
import net.sourceforge.plantuml.ugraphic.UCenteredCharacter;
import net.sourceforge.plantuml.ugraphic.UChange;
import net.sourceforge.plantuml.ugraphic.UClip;
import net.sourceforge.plantuml.ugraphic.UEllipse;
import net.sourceforge.plantuml.ugraphic.UGraphic;
import net.sourceforge.plantuml.ugraphic.UImage;
import net.sourceforge.plantuml.ugraphic.UImageSvg;
import net.sourceforge.plantuml.ugraphic.ULine;
import net.sourceforge.plantuml.ugraphic.UPath;
import net.sourceforge.plantuml.ugraphic.UPixel;
import net.sourceforge.plantuml.ugraphic.UPolygon;
import net.sourceforge.plantuml.ugraphic.URectangle;
import net.sourceforge.plantuml.ugraphic.UText;
import net.sourceforge.plantuml.ugraphic.color.ColorMapper;
import net.sourceforge.plantuml.ugraphic.color.HColor;

public class UGraphicG2d extends AbstractUGraphic implements EnsureVisible {

	private BufferedImage bufferedImage;

	private final double dpiFactor;

	private UAntiAliasing antiAliasing = UAntiAliasing.ANTI_ALIASING_ON;

	private List urls = new ArrayList<>();
	private Set allUrls = new HashSet<>();

	private final boolean hasAffineTransform;

	public final Set getAllUrlsEncountered() {
		return Collections.unmodifiableSet(allUrls);
	}

	@Override
	public UGraphic apply(UChange change) {
		final UGraphicG2d copy = (UGraphicG2d) super.apply(change);
		if (change instanceof UAntiAliasing) {
			copy.antiAliasing = (UAntiAliasing) change;
		}
		return copy;
	}

	@Override
	protected AbstractCommonUGraphic copyUGraphic() {
		return new UGraphicG2d(this);
	}

	private UGraphicG2d(UGraphicG2d other) {
		super(other);
		this.hasAffineTransform = other.hasAffineTransform;
		this.dpiFactor = other.dpiFactor;
		this.bufferedImage = other.bufferedImage;
		this.urls = other.urls;
		this.allUrls = other.allUrls;
		this.antiAliasing = other.antiAliasing;
		register(dpiFactor);
	}

	public UGraphicG2d(HColor defaultBackground, ColorMapper colorMapper, StringBounder stringBounder, Graphics2D g2d,
			double dpiFactor) {
		this(defaultBackground, colorMapper, stringBounder, g2d, dpiFactor, null, 0, 0);
	}

	public UGraphicG2d(HColor defaultBackground, ColorMapper colorMapper, StringBounder stringBounder, Graphics2D g2d,
			double dpiFactor, AffineTransformation affineTransform, double dx, double dy) {
		super(defaultBackground, colorMapper, stringBounder, g2d);
		this.hasAffineTransform = affineTransform != null;
		this.dpiFactor = dpiFactor;
		if (dpiFactor != 1.0)
			g2d.scale(dpiFactor, dpiFactor);

		if (this.hasAffineTransform) {
			if (dx != 0 || dy != 0)
				getGraphicObject().transform(AffineTransform.getTranslateInstance(dx, dy));
			getGraphicObject().transform(affineTransform.getAffineTransform());
		}
		register(dpiFactor);
	}

	private void register(double dpiFactor) {
		registerDriver(URectangle.class, new DriverRectangleG2d(dpiFactor, this));
		if (this.hasAffineTransform || dpiFactor != 1.0) {
			registerDriver(UText.class, new DriverTextAsPathG2d(this, getStringBounder()));
		} else {
			registerDriver(UText.class, new DriverTextG2d(this, getStringBounder()));
		}
		registerDriver(ULine.class, new DriverLineG2d(dpiFactor));
		registerDriver(UPixel.class, new DriverPixelG2d());
		registerDriver(UPolygon.class, new DriverPolygonG2d(dpiFactor, this));
		registerDriver(UEllipse.class, new DriverEllipseG2d(dpiFactor, this));
		ignoreShape(UImageSvg.class);
		registerDriver(UImage.class, new DriverImageG2d(dpiFactor, this));
		registerDriver(DotPath.class, new DriverDotPathG2d(this));
		registerDriver(UPath.class, new DriverPathG2d(dpiFactor));
		registerDriver(UCenteredCharacter.class, new DriverCenteredCharacterG2d());
	}

	@Override
	protected void beforeDraw() {
		super.beforeDraw();
		applyClip();
		antiAliasing.apply(getGraphicObject());
	}

	private void applyClip() {
		final UClip uclip = getClip();
		if (uclip == null) {
			getGraphicObject().setClip(null);
		} else {
			final Shape clip = new Rectangle2D.Double(uclip.getX(), uclip.getY(), uclip.getWidth(), uclip.getHeight());
			getGraphicObject().setClip(clip);
		}
	}

	protected final double getDpiFactor() {
		return dpiFactor;
	}

	@Override
	public void startUrl(Url url) {
		Objects.requireNonNull(url);
		// javascript: security issue
		if (SecurityUtils.ignoreThisLink(url.getUrl())) {
			urls.add(null);
		} else {
			urls.add(url);
			allUrls.add(url);
		}
	}

	@Override
	public void closeUrl() {
		urls.remove(urls.size() - 1);
	}

	public void ensureVisible(double x, double y) {
		for (Url u : urls)
			if (u != null && (getClip() == null || getClip().isInside(x, y)))
				u.ensureVisible(x, y);

	}

	public BufferedImage getBufferedImage() {
		return bufferedImage;
	}

	public void setBufferedImage(BufferedImage bufferedImage) {
		this.bufferedImage = bufferedImage;
	}

	public Graphics2D getGraphics2D() {
		return getGraphicObject();
	}

	@Override
	public void writeToStream(OutputStream os, String metadata, int dpi) throws IOException {
		final BufferedImage im = getBufferedImage();
		PngIO.write(im, os, metadata, dpi);
	}

	@Override
	public double dpiFactor() {
		return dpiFactor;
	}

}