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Batik Graphics Vector Tree (GVT)
There is a newer version: 1.18
/*

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   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.

 */
package org.apache.batik.gvt;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.awt.geom.Point2D;

/**
 * A shape painter that can be used to draw the outline of a shape.
 *
 * @author Thierry Kormann
 * @version $Id: StrokeShapePainter.java 1733416 2016-03-03 07:07:13Z gadams $
 */
public class StrokeShapePainter implements ShapePainter {

    /** 
     * Shape painted by this painter.
     */
    protected Shape shape;

    /**
     * Stroked version of the shape.
     */
    protected Shape strokedShape;

    /**
     * The stroke attribute used to draw the outline of the shape.
     */
    protected Stroke stroke;

    /**
     * The paint attribute used to draw the outline of the shape.
     */
    protected Paint paint;

    /**
     * Constructs a new ShapePainter that can be used to draw the
     * outline of a Shape.
     *
     * @param shape shape to be painted by this painter.
     * Should not be null.
     */
    public StrokeShapePainter(Shape shape) {
        if (shape == null) {
            throw new IllegalArgumentException();
        }
        this.shape = shape;
    }

    /**
     * Sets the stroke used to draw the outline of a shape.
     *
     * @param newStroke the stroke object used to draw the outline of the shape
     */
    public void setStroke(Stroke newStroke) {
        this.stroke       = newStroke;
        this.strokedShape = null;
    }

    /**
     * Gets the stroke used to draw the outline of the shape.
     */
    public Stroke getStroke() {
        return stroke;
    }

    /**
     * Sets the paint used to fill a shape.
     *
     * @param newPaint the paint object used to draw the shape
     */
    public void setPaint(Paint newPaint) {
        this.paint = newPaint;
    }

    /**
     * Gets the paint used to draw the outline of the shape.
     */
    public Paint getPaint() {
        return paint;
    }

    /**
     * Paints the outline of the specified shape using the specified 
     * Graphics2D.
     *
     * @param g2d the Graphics2D to use 
     */
    public void paint(Graphics2D g2d) {
        if (stroke != null && paint != null) {
            g2d.setPaint(paint);
            g2d.setStroke(stroke);
            g2d.draw(shape);
        }
    }

    /**
     * Returns the area painted by this shape painter.
     */
    public Shape getPaintedArea(){
        if ((paint == null) || (stroke == null))
            return null;

        if (strokedShape == null)
            strokedShape = stroke.createStrokedShape(shape);

        return strokedShape;
    }

    /**
     * Returns the bounds of the area painted by this shape painter
     */
    public Rectangle2D getPaintedBounds2D() {
        Shape painted = getPaintedArea();
        if (painted == null)
            return null;

        return painted.getBounds2D();
    }

    /**
     * Returns the bounds of the area covered by this shape painter
     */
    public boolean inPaintedArea(Point2D pt){
        Shape painted = getPaintedArea();
        if (painted == null)
            return false;
        return painted.contains(pt);
    }
        
    /**
     * Returns the area covered by this shape painter (even if not painted).
     */
    public Shape getSensitiveArea(){
        if (stroke == null)
            return null;

        if (strokedShape == null)
            strokedShape = stroke.createStrokedShape(shape);

        return strokedShape;
    }

    /**
     * Returns the bounds of the area covered by this shape painter
     * (even if not painted).
     */
    public Rectangle2D getSensitiveBounds2D() {
        Shape sensitive = getSensitiveArea();
        if (sensitive == null)
            return null;

        return sensitive.getBounds2D();
    }

    /**
     * Returns the bounds of the area covered by this shape painter
     * (even if not painted).
     */
    public boolean inSensitiveArea(Point2D pt){
        Shape sensitive = getSensitiveArea();
        if (sensitive == null)
            return false;
        return sensitive.contains(pt);
    }
        
    /**
     * Sets the Shape this shape painter is associated with.
     *
     * @param shape new shape this painter should be associated with.
     * Should not be null.
     */
    public void setShape(Shape shape){
        if (shape == null) {
            throw new IllegalArgumentException();
        }
        this.shape = shape;
        this.strokedShape = null;
    }

    /**
     * Gets the Shape this shape painter is associated with.
     *
     * @return shape associated with this painter.
     */
    public Shape getShape(){
        return shape;
    }
}