| /******************************************************************************* |
| * Copyright (c) 2000, 2010 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.draw2d; |
| |
| import org.eclipse.draw2d.geometry.Point; |
| import org.eclipse.draw2d.geometry.PointList; |
| import org.eclipse.draw2d.geometry.Transform; |
| |
| /** |
| * A decorative Figure intended to be placed on a {@link Polyline}. It has the |
| * default shape of right-pointing triangle. |
| */ |
| public class PolylineDecoration extends Polyline implements RotatableDecoration { |
| |
| /** A triangle template */ |
| public static final PointList TRIANGLE_TIP = new PointList(); |
| |
| static { |
| TRIANGLE_TIP.addPoint(-1, 1); |
| TRIANGLE_TIP.addPoint(0, 0); |
| TRIANGLE_TIP.addPoint(-1, -1); |
| } |
| |
| private Point location = new Point(); |
| private PointList template = TRIANGLE_TIP; |
| private Transform transform = new Transform(); |
| |
| /** |
| * Constructs a PolylineDecoration. Defaults the PolylineDecoration to fill |
| * its region with black. |
| * |
| * @since 2.0 |
| */ |
| public PolylineDecoration() { |
| setBackgroundColor(ColorConstants.black); |
| setScale(7, 3); |
| } |
| |
| /** |
| * @see Polyline#getPoints() |
| */ |
| public PointList getPoints() { |
| if (points == null) { |
| points = new PointList(); |
| for (int i = 0; i < template.size(); i++) |
| points.addPoint(transform.getTransformed(template.getPoint(i))); |
| } |
| return points; |
| } |
| |
| /** |
| * @see IFigure#setLocation(Point) |
| */ |
| public void setLocation(Point p) { |
| points = null; |
| bounds = null; |
| location.setLocation(p); |
| transform.setTranslation(p.x, p.y); |
| } |
| |
| /** |
| * Sets the PolylineDecoration's point template. This template is an outline |
| * of the PolylineDecoration's region. (The default value is TRIANGLE_TIP |
| * which is a triangle whose tip is pointing to the right). |
| * |
| * @param pl |
| * the template |
| * @since 2.0 |
| */ |
| public void setTemplate(PointList pl) { |
| erase(); |
| template = pl; |
| points = null; |
| bounds = null; |
| repaint(); |
| } |
| |
| /** |
| * Sets the amount of scaling to be done along X and Y axes on the |
| * PolylineDecoration's template. |
| * |
| * @param x |
| * the x scale |
| * @param y |
| * the y scale |
| * @since 2.0 |
| */ |
| public void setScale(double x, double y) { |
| points = null; |
| bounds = null; |
| transform.setScale(x, y); |
| } |
| |
| /** |
| * @see RotatableDecoration#setReferencePoint(Point) |
| */ |
| public void setReferencePoint(Point ref) { |
| Point pt = Point.SINGLETON; |
| pt.setLocation(ref); |
| pt.negate().translate(location); |
| setRotation(Math.atan2(pt.y, pt.x)); |
| } |
| |
| /** |
| * Sets the angle by which rotation is to be done on the PolylineDecoration. |
| * |
| * @param angle |
| * the angle of rotation |
| * @since 2.0 |
| */ |
| public void setRotation(double angle) { |
| points = null; |
| bounds = null; |
| transform.setRotation(angle); |
| } |
| |
| } |