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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:
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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]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.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 GPL v2 license.
 *
 * The generated images can then be used without any reference to the GPL v2 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.svek.extremity;

import java.awt.geom.AffineTransform;

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

class ExtremityCrowfoot extends Extremity {

	private final XPoint2D contact;
	private double angle;
	private final Side side;

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

	public ExtremityCrowfoot(XPoint2D p1, double angle, Side side) {
		this.contact = new XPoint2D(p1.getX(), p1.getY());
		this.angle = manageround(angle + Math.PI / 2);
		this.side = side;
	}
	
	@Override
	public double getDecorationLength() {
		return 8;
	}

	public void drawU(UGraphic ug) {
		final int xWing = 8;
		final int yAperture = 8;
		final AffineTransform rotate = AffineTransform.getRotateInstance(this.angle);
		XPoint2D middle = new XPoint2D(0, 0);
		XPoint2D left = new XPoint2D(0, -yAperture);
		XPoint2D base = new XPoint2D(-xWing, 0);
		XPoint2D right = new XPoint2D(0, yAperture);
		left = left.transform(rotate);
		base = base.transform(rotate);
		right = right.transform(rotate);

		if (side == Side.WEST || side == Side.EAST) {
			left = new XPoint2D(middle.getX(), left.getY());
			right = new XPoint2D(middle.getX(), right.getY());
		}
		if (side == Side.SOUTH || side == Side.NORTH) {
			left = new XPoint2D(left.getX(), middle.getY());
			right = new XPoint2D(right.getX(), middle.getY());
		}

		drawLine(ug, contact.getX(), contact.getY(), base, left);
		drawLine(ug, contact.getX(), contact.getY(), base, right);
		drawLine(ug, contact.getX(), contact.getY(), base, middle);
	}

	static private void drawLine(UGraphic ug, double x, double y, XPoint2D p1, XPoint2D p2) {
		final double dx = p2.getX() - p1.getX();
		final double dy = p2.getY() - p1.getY();
		ug.apply(new UTranslate(x + p1.getX(), y + p1.getY())).draw(new ULine(dx, dy));

	}

}