archive/plugins/org.eclipse.app4mc.multicore.execution.ui.widget/src/org/eclipse/app4mc/multicore/execution/ui/widget/gantt/elements/Arrow.java

/*******************************************************************************
 * Copyright (c) 2017, 2019 Dortmund University of Applied Sciences and Arts and others.
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 *  
 * SPDX-License-Identifier: EPL-2.0
 *  
 * Contributors:
 *   Dortmund University of Applied Sciences and Arts - initial API and implementation
 *******************************************************************************/
package org.eclipse.app4mc.multicore.execution.ui.widget.gantt.elements;


import javafx.scene.paint.Color;
import javafx.scene.shape.LineTo;
import javafx.scene.shape.MoveTo;
import javafx.scene.shape.Path;


public class Arrow extends Path {
	private static final double defaultArrowHeadSize = 5.0;

	public Arrow(double startX, double startY, double endX, double endY, Color c, double arrowHeadSize) {
		super();
		strokeProperty().bind(fillProperty());
		setFill(c);
		// Line
		getElements().add(new MoveTo(endX, endY));
		// ArrowHead
		double angle = Math.atan2((endY - startY), (endX - startX)) - Math.PI / 2.0;
		double sin = Math.sin(angle);
		double cos = Math.cos(angle);
		// point1
		double x1 = (-1.0 / 2.0 * cos + Math.sqrt(3) / 2 * sin) * arrowHeadSize + endX;
		double y1 = (-1.0 / 2.0 * sin - Math.sqrt(3) / 2 * cos) * arrowHeadSize + endY;
		// point2
		double x2 = (1.0 / 2.0 * cos + Math.sqrt(3) / 2 * sin) * arrowHeadSize + endX;
		double y2 = (1.0 / 2.0 * sin - Math.sqrt(3) / 2 * cos) * arrowHeadSize + endY;

		getElements().add(new LineTo(x1, y1));
		getElements().add(new LineTo(x2, y2));
		getElements().add(new LineTo(endX, endY));
		setStrokeWidth(2);
	}


	public Arrow(double startX, double startY, double endX, double endY) {
		this(startX, startY, endX, endY, Color.BLACK, defaultArrowHeadSize);
	}
}