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83 lines
2.4 KiB
Java
83 lines
2.4 KiB
Java
/* ========================================================================
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* PlantUML : a free UML diagram generator
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* ========================================================================
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*
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* Project Info: https://plantuml.com
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*
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* This file is part of Smetana.
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* Smetana is a partial translation of Graphviz/Dot sources from C to Java.
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*
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* (C) Copyright 2009-2024, Arnaud Roques
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*
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* This translation is distributed under the same Licence as the original C program.
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*
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* THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
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* LICENSE ("AGREEMENT"). [Eclipse Public License - v 1.0]
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*
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* ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
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* RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
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*
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* You may obtain a copy of the License at
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*
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package net.sourceforge.plantuml.jsondiagram;
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import net.sourceforge.plantuml.klimt.UPath;
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import net.sourceforge.plantuml.klimt.UStroke;
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import net.sourceforge.plantuml.klimt.drawing.UGraphic;
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import net.sourceforge.plantuml.klimt.geom.XPoint2D;
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import net.sourceforge.plantuml.klimt.shape.ULine;
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public class Arrow {
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private final XPoint2D p1;
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private final XPoint2D p2;
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public Arrow(XPoint2D p1, XPoint2D p2) {
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this.p1 = p1;
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this.p2 = p2;
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}
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public void drawArrow(UGraphic ug) {
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ug = ug.apply(new UStroke());
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final ULine p1p2 = new ULine(p1, p2);
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final double dist = p1.distance(p2);
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final double alpha = Math.atan2(p1p2.getDX(), p1p2.getDY());
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final double factor = .4;
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final double factor2 = .3;
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final XPoint2D p3 = getPoint(p1, alpha + Math.PI / 2, dist * factor);
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final XPoint2D p4 = getPoint(p1, alpha - Math.PI / 2, dist * factor);
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final XPoint2D p11 = getPoint(p1, alpha, dist * factor2);
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final UPath path = new UPath();
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path.moveTo(p4);
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path.lineTo(p11);
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path.lineTo(p3);
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path.lineTo(p2);
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path.lineTo(p4);
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path.closePath();
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ug.draw(path);
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}
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private XPoint2D getPoint(XPoint2D center, double alpha, double len) {
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final double x = center.getX() + len * Math.sin(alpha);
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final double y = center.getY() + len * Math.cos(alpha);
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return new XPoint2D(x, y);
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}
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}
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