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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.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the Eclipse Public License.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [Eclipse Public License - v 1.0]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this EPL license.
 *
 * The generated images can then be used without any reference to the EPL license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.sequencediagram.graphic;

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

import net.sourceforge.plantuml.klimt.creole.Display;
import net.sourceforge.plantuml.sequencediagram.Newpage;

class PageSplitter {

	private final double fullHeight;
	private final List positions;
	private final List titles;
	private final double headerHeight;
	private final double tailHeight;
	private final double signatureHeight;
	private final double newpageHeight;
	private final Display diagramTitle;

	PageSplitter(double fullHeight, double headerHeight, Map newpages, double tailHeight,
			double signatureHeight, double newpageHeight, Display diagramTitle) {
		this.fullHeight = fullHeight;
		this.diagramTitle = diagramTitle;
		this.titles = new ArrayList<>();
		this.positions = new ArrayList<>();

		for (Map.Entry ent : newpages.entrySet()) {
			titles.add(ent.getKey().getTitle());
			positions.add(ent.getValue());
		}

		this.headerHeight = headerHeight;
		this.tailHeight = tailHeight;
		this.signatureHeight = signatureHeight;
		this.newpageHeight = newpageHeight;
	}

	public List getPages() {

		if (positions.size() == 0) {
			return Arrays.asList(onePage());
		}
		final List result = new ArrayList<>();

		result.add(firstPage());
		for (int i = 0; i < positions.size() - 1; i++) {
			result.add(createPage(i));
		}
		result.add(lastPage());

		return result;
	}

	private Page lastPage() {
		final double newpage1 = positions.get(positions.size() - 1) - this.newpageHeight;
		final double newpage2 = this.fullHeight - this.tailHeight - this.signatureHeight;
		final Display title = titles.get(positions.size() - 1);
		return new Page(headerHeight, newpage1, newpage2, tailHeight, signatureHeight, title);
	}

	private Page firstPage() {
		final double newpage1 = this.headerHeight;
		final double newpage2 = positions.get(0) + this.newpageHeight;
		return new Page(headerHeight, newpage1, newpage2, tailHeight, 0, diagramTitle);
	}

	private Page onePage() {
		final double newpage1 = this.headerHeight;
		final double newpage2 = this.fullHeight - this.tailHeight - this.signatureHeight;
		return new Page(headerHeight, newpage1, newpage2, tailHeight, signatureHeight, diagramTitle);
	}

	private Page createPage(int i) {
		final double newpage1 = positions.get(i) - this.newpageHeight;
		final double newpage2 = positions.get(i + 1) + this.newpageHeight;
		final Display title = titles.get(i);
		return new Page(headerHeight, newpage1, newpage2, tailHeight, 0, title);
	}

}