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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
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 * Project Info:  https://plantuml.com
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 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License V2.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
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 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
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 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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 * 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
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 * 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 GPL v2 license.
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 * The generated images can then be used without any reference to the GPL v2 license.
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 * although this will be appreciated by the PlantUML team.
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 * by any license, then the generated images are logically covered
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 *
 * 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
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 * 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.svek.extremity;

import java.awt.geom.AffineTransform;

import net.sourceforge.plantuml.klimt.UTranslate;
import net.sourceforge.plantuml.klimt.color.HColors;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.geom.XPoint2D;
import net.sourceforge.plantuml.klimt.shape.ULine;

class ExtremityHalfArrow extends Extremity {

	private final ULine line;
	private final ULine otherLine;
	private final XPoint2D contact;

	@Override
	public XPoint2D somePoint() {
		return contact;
	}

	public ExtremityHalfArrow(XPoint2D p1, double angle, XPoint2D center) {
		angle = manageround(angle);
		final AffineTransform rotate = AffineTransform.getRotateInstance(angle + Math.PI / 2);
		final int xWing = 9;
		final int yAperture = 4;
		XPoint2D other = new XPoint2D(-xWing, -yAperture);
		other = other.transform(rotate);

		this.contact = p1;
		this.line = new ULine(center.getX() - contact.getX(), center.getY() - contact.getY());
		this.otherLine = new ULine(other.getX(), other.getY());
	}

	public ExtremityHalfArrow(XPoint2D p0, double angle) {
		angle = manageround(angle);
		final int xWing = 9;
		final int yAperture = 4;

		this.contact = p0;

		final XPoint2D other = new XPoint2D(-xWing, -yAperture).transform(AffineTransform.getRotateInstance(angle));
		final XPoint2D other2 = new XPoint2D(-8, 0).transform(AffineTransform.getRotateInstance(angle));

		this.line = new ULine(other.getX(), other.getY());
		this.otherLine = new ULine(other2.getX(), other2.getY());
	}

	public void drawU(UGraphic ug) {
		ug = ug.apply(HColors.changeBack(ug));
		if (line != null && line.getLength() > 2) {
			final UTranslate position = UTranslate.point(contact);
			ug.apply(position).draw(line);
			ug.apply(position).draw(otherLine);
		}
	}

}