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/*******************************************************************************
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* Copyright (c) 2000, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.draw2d;
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import org.eclipse.swt.graphics.Color;
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import org.eclipse.draw2d.geometry.Point;
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import org.eclipse.draw2d.geometry.PointList;
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import org.eclipse.draw2d.geometry.Transform;
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/**
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* A rotatable, polygon shaped decoration most commonly used for decorating the
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* ends of {@link org.eclipse.draw2d.Polyline polylines}.
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*/
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public class PolygonDecoration extends Polygon implements RotatableDecoration {
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/**
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* Template for a triangle that points to the right when the rotation angle
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* is 0
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*/
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public static final PointList TRIANGLE_TIP = new PointList();
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/**
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* Template for a triangle that points to the left when the rotation angle
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* is 0
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*/
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public static final PointList INVERTED_TRIANGLE_TIP = new PointList();
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static {
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TRIANGLE_TIP.addPoint(0, 0);
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TRIANGLE_TIP.addPoint(-1, 1);
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TRIANGLE_TIP.addPoint(-1, -1);
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INVERTED_TRIANGLE_TIP.addPoint(0, 1);
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INVERTED_TRIANGLE_TIP.addPoint(0, -1);
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INVERTED_TRIANGLE_TIP.addPoint(-1, 0);
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}
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private Point location = new Point();
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private PointList template = TRIANGLE_TIP;
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private Transform transform = new Transform();
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/**
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* Constructs a PolygonDecoration. Defaults the PolygonDecoration to fill
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* its region with black.
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*
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* @since 2.0
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*/
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public PolygonDecoration() {
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setFill(true);
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setScale(7, 3);
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}
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/**
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* @see org.eclipse.draw2d.IFigure#getBackgroundColor()
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*/
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public Color getLocalBackgroundColor() {
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if (super.getLocalBackgroundColor() == null)
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return getForegroundColor();
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return super.getLocalBackgroundColor();
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}
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/**
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* Returns the points in the PolygonDecoration as a PointList.
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*
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* @return the points in this PolygonDecoration
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* @since 2.0
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*/
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public PointList getPoints() {
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if (points == null) {
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points = new PointList();
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for (int i = 0; i < template.size(); i++)
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points.addPoint(transform.getTransformed(template.getPoint(i)));
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}
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return points;
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}
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/**
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* Sets the location of this PolygonDecoration.
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*
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* @param p
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* the new location
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*/
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public void setLocation(Point p) {
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points = null;
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bounds = null;
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location.setLocation(p);
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transform.setTranslation(p.x, p.y);
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}
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/**
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* Sets the PolygonDecorations point template to the passed PointList. This
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* template is an outline of the PolygonDecoration's region. (The default
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* value is TRIANGLE_TIP which is a triangle whose tip is pointing to the
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* right).
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*
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* @param pl
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* the PointList outline to use as the PolygonDecoration's region
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* @since 2.0
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*/
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public void setTemplate(PointList pl) {
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erase();
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template = pl;
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points = null;
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bounds = null;
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repaint();
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}
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/**
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* Sets the amount of scaling to be done along X and Y axes on the
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* PolygonDecoration's template.
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*
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* @param x
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* X scaling
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* @param y
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* Y scaling
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* @since 2.0
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*/
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public void setScale(double x, double y) {
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points = null;
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bounds = null;
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transform.setScale(x, y);
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}
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/**
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* Sets the rotation of this decoration so that the decoration points toward
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* the given reference point.
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*
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* @param ref
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* the reference point
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*/
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public void setReferencePoint(Point ref) {
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Point pt = Point.SINGLETON;
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pt.setLocation(ref);
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pt.negate().translate(location);
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setRotation(Math.atan2(pt.y, pt.x));
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}
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/**
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* Sets the angle by which rotation is to be done on the PolygonDecoration.
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*
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* @param angle
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* Angle of rotation
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* @since 2.0
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*/
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public void setRotation(double angle) {
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points = null;
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bounds = null;
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transform.setRotation(angle);
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}
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}
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