/*
 * Copyright (c) 2008-2009, Piccolo2D project, http://piccolo2d.org
 * Copyright (c) 1998-2008, University of Maryland
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions
 * and the following disclaimer in the documentation and/or other materials provided with the
 * distribution.
 *
 * None of the name of the University of Maryland, the name of the Piccolo2D project, or the names of its
 * contributors may be used to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package edu.umd.cs.piccolo.examples;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Stroke;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import edu.umd.cs.piccolo.PCanvas;
import edu.umd.cs.piccolo.PLayer;
import edu.umd.cs.piccolo.PNode;
import edu.umd.cs.piccolo.event.PInputEvent;
import edu.umd.cs.piccolo.util.PDimension;
import edu.umd.cs.piccolo.util.PPaintContext;
import edu.umd.cs.piccolox.PFrame;
import edu.umd.cs.piccolox.handles.PHandle;
import edu.umd.cs.piccolox.util.PLocator;

/**
 * This shows how to create a simple node that has two handles and can be used
 * for specifying angles. The nodes UI desing isn't very exciting, but the
 * example shows one way to create a custom node with custom handles.
 */
public class AngleNodeExample extends PFrame {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public AngleNodeExample() {
        this(null);
    }

    public AngleNodeExample(final PCanvas aCanvas) {
        super("AngleNodeExample", false, aCanvas);
    }

    public void initialize() {
        final PCanvas c = getCanvas();
        final PLayer l = c.getLayer();
        l.addChild(new AngleNode());
    }

    public static void main(final String[] args) {
        new AngleNodeExample();
    }

    // the angle node class
    public static class AngleNode extends PNode {
        /**
         * 
         */
        private static final long serialVersionUID = 1L;
        protected Point2D.Double pointOne;
        protected Point2D.Double pointTwo;
        protected Stroke stroke;

        public AngleNode() {
            pointOne = new Point2D.Double(100, 0);
            pointTwo = new Point2D.Double(0, 100);
            stroke = new BasicStroke(1, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
            setPaint(Color.BLACK);
            updateBounds();
            addHandles();
        }

        public void addHandles() {
            // point one
            PLocator l = new PLocator() {
                /**
                 * 
                 */
                private static final long serialVersionUID = 1L;

                public double locateX() {
                    return pointOne.getX();
                }

                public double locateY() {
                    return pointOne.getY();
                }
            };
            PHandle h = new PHandle(l) {
                /**
                 * 
                 */
                private static final long serialVersionUID = 1L;

                public void dragHandle(final PDimension aLocalDimension, final PInputEvent aEvent) {
                    localToParent(aLocalDimension);
                    pointOne.setLocation(pointOne.getX() + aLocalDimension.getWidth(), pointOne.getY()
                            + aLocalDimension.getHeight());
                    updateBounds();
                    relocateHandle();
                }
            };
            addChild(h);

            // point two
            l = new PLocator() {
                /**
                 * 
                 */
                private static final long serialVersionUID = 1L;

                public double locateX() {
                    return pointTwo.getX();
                }

                public double locateY() {
                    return pointTwo.getY();
                }
            };
            h = new PHandle(l) {
                /**
                 * 
                 */
                private static final long serialVersionUID = 1L;

                public void dragHandle(final PDimension aLocalDimension, final PInputEvent aEvent) {
                    localToParent(aLocalDimension);
                    pointTwo.setLocation(pointTwo.getX() + aLocalDimension.getWidth(), pointTwo.getY()
                            + aLocalDimension.getHeight());
                    updateBounds();
                    relocateHandle();
                }
            };
            addChild(h);
        }

        protected void paint(final PPaintContext paintContext) {
            final Graphics2D g2 = paintContext.getGraphics();
            g2.setStroke(stroke);
            g2.setPaint(getPaint());
            g2.draw(getAnglePath());
        }

        protected void updateBounds() {
            final GeneralPath p = getAnglePath();
            final Rectangle2D b = stroke.createStrokedShape(p).getBounds2D();
            super.setBounds(b.getX(), b.getY(), b.getWidth(), b.getHeight());
        }

        public GeneralPath getAnglePath() {
            final GeneralPath p = new GeneralPath();
            p.moveTo((float) pointOne.getX(), (float) pointOne.getY());
            p.lineTo(0, 0);
            p.lineTo((float) pointTwo.getX(), (float) pointTwo.getY());
            return p;
        }

        public boolean setBounds(final double x, final double y, final double width, final double height) {
            return false; // bounds can be set externally
        }
    }
}