shapeslistener.java

一个用Java写的

/******************************************************************
 * Copyright (C) 2002-2006 Andrew Girow. All rights reserved.     *
 * ---------------------------------------------------------------*
 * This software is published under the terms of the TinyLine     *
 * License, a copy of which has been included with this           *
 * distribution in the TINYLINE_LICENSE.TXT file.                 *
 *                                                                *
 * For more information on the TinyLine,                          *
 * please see <http://www.tinyline.com/>.                         *
 *****************************************************************/

package tinyapp;

import org.w3c.dom.events.*;
import com.tinyline.tiny2d.*;
import com.tinyline.svg.*;


import com.tinyline.app.PPSVGCanvas;
import com.tinyline.app.SVGEvent;


/**
 * This class represents the custom event listener
 * <p>
 * @author (C) Andrew Girow
 * @version 1.10
 * <p>
 */
public class ShapesListener implements org.w3c.dom.events.EventListener
{
     PPSVGCanvas canvas;

    // The red color
    TinyColor redColor    =  new TinyColor(0xFFFF0000);
    // The yellow color
    TinyColor yellowColor =  new TinyColor(0xFFFFFF00);
    // The navy color
    TinyColor navyColor   =  new TinyColor(0xFF000080);

    public ShapesListener(PPSVGCanvas canvas)
    {
	this.canvas = canvas;
    }

    /**
     * Creates the circle SVG element.
     */
    void Circle()
		{
        // We should add the circle element after the 'whiteboard'
        // <circle id="mycircle" cx="70" cy="100" r="30" fill="red"
	// stroke="yellow" stroke-width="4"  />
	//
	//
        // Get the raster
        SVGRaster   raster   = canvas.raster;
        // Get the SVGT document
        SVGDocument document = raster.getSVGDocument();

        // Get the root of the SVGT document
        SVGSVGElem root = (SVGSVGElem)document.root;

	// If there is a node with id 'mycircle' then remove it.
	// Otherwise create and add it.
	SVGNode node = SVGNode.getNodeById(root, new TinyString("mycircle".toCharArray()));
	if(node != null)
	{
	   // 3. Fire the update event
	   SVGNode parent = node.parent;
	   int index = parent.children.indexOf(node,0);
           parent.removeChild(index);
           SVGEvent event = new SVGEvent(SVGEvent.EVENT_UPDATE, node.getDevBounds(raster) );
           canvas.postEvent(event);
           return;
        }

        // Create a new circle element
        SVGEllipseElem circle =
          (SVGEllipseElem)document.createElement(SVG.ELEM_CIRCLE);
        // Add the circle element AFTER the whiteboard element
	node = SVGNode.getNodeById(root, new TinyString("whiteboard".toCharArray()));
	if(node != null)
	{
	   SVGNode parent = node.parent;
	   int index = parent.children.indexOf(node,0);
           parent.addChild(circle, index + 1);
	}
        // Use the DOM-like API to change properties
        TinyNumber cx = new TinyNumber(70<<TinyUtil.FIX_BITS);
        TinyNumber cy = new TinyNumber(100<<TinyUtil.FIX_BITS);
        TinyNumber r = new TinyNumber(30<<TinyUtil.FIX_BITS);
        TinyNumber stroke_width = new TinyNumber(4<<TinyUtil.FIX_BITS);
        TinyColor fillColor = redColor;
        TinyColor strokeColor = yellowColor;
        try
        {
           circle.setAttribute(SVG.ATT_ID, new TinyString("mycircle".toCharArray()));
           circle.setAttribute(SVG.ATT_CX,cx);
           circle.setAttribute(SVG.ATT_CY,cy);
           circle.setAttribute(SVG.ATT_R,r);
           circle.setAttribute(SVG.ATT_FILL,fillColor);
           circle.setAttribute(SVG.ATT_STROKE,strokeColor);
           circle.setAttribute(SVG.ATT_STROKE_WIDTH,stroke_width);
           // Init the element.
           circle.createOutline();
        }
        catch(Exception ex)
        {
           ex.printStackTrace();
        }
	// 3. Fire the update event
        SVGEvent event = new SVGEvent(SVGEvent.EVENT_UPDATE, circle.getDevBounds(raster) );
        canvas.postEvent(event);
    }


    /**
     * Creates the rect SVG element.
     */
    void Rect()
    {
        // We should add the rect element after the 'whiteboard'
        // <rect id="myrect" x="120" y="80" width="40" height="40"
				// fill="yellow" stroke="navy" stroke-width="4"  />
        // Get the raster
        SVGRaster   raster   = canvas.raster;
        // Get the SVGT document
        SVGDocument document = raster.getSVGDocument();

        // Get the root of the SVGT document
        SVGSVGElem root = (SVGSVGElem)document.root;

	// If there is a node with id 'myrect' then remove it.
	// Otherwise create and add it.
	SVGNode node = SVGNode.getNodeById(root, new TinyString("myrect".toCharArray()));
	if(node != null)
	{
	   // 3. Fire the update event
	   SVGNode parent = node.parent;
	   int index = parent.children.indexOf(node,0);
           parent.removeChild(index);
           SVGEvent event = new SVGEvent(SVGEvent.EVENT_UPDATE, node.getDevBounds(raster) );
           canvas.postEvent(event);
           return;
        }

        // Create a new rect element
        SVGRectElem rect =
          (SVGRectElem)document.createElement(SVG.ELEM_RECT);

        // Add the rect element AFTER the whiteboard element
	node = SVGNode.getNodeById(root, new TinyString("whiteboard".toCharArray()));
	if(node != null)
	{
	   SVGNode parent = node.parent;
	   int index = parent.children.indexOf(node,0);
           parent.addChild(rect, index + 1);
	}

        // Use the Direct TinyLine API to change properties
	rect.id = new TinyString("myrect".toCharArray());
        rect.x = 120 << TinyUtil.FIX_BITS;
        rect.y =  80 << TinyUtil.FIX_BITS;
        rect.width = 40 << TinyUtil.FIX_BITS;
        rect.height = 40 << TinyUtil.FIX_BITS;
        rect.fill   = yellowColor;
        rect.stroke = navyColor;
        rect.strokeWidth = 4 << TinyUtil.FIX_BITS;
	// Create the outline.
        rect.createOutline();

	// 3. Fire the update event
        SVGEvent event = new SVGEvent(SVGEvent.EVENT_UPDATE, rect.getDevBounds(raster) );
        canvas.postEvent(event);
    }

    /**
     *  <b>uDOM:</b> Invoked whenever an event occurs of the type for which
     *  the <tt> EventListener</tt> interface was registered.
     *  @param evt The <tt>Event</tt> contains contextual information
     *             about the event.
     */
    public void handleEvent(Event evt)
    {
//  System.out.println("handleEvent " + evt.getType());
         SVGEvent theEvent = (SVGEvent) evt;
         switch(theEvent.id)
         {
		case Shapes2.USER_EVENT:
                   TinyNumber subtype = (TinyNumber)theEvent.data;
		   switch ( subtype.val )
		   {
		       case Shapes2.SHAPE_CIRCLE:
			    Circle();
			    break;
		       case Shapes2.SHAPE_RECT:
			    Rect();
			    break;
		   }
                   break;

		case SVGEvent.EVENT_CLICK:
                   TinyPoint point = (TinyPoint)theEvent.data;
                   System.out.println("Shapes: linkEvent: (" + point.x +", "+ point.y+") ");
		   SVGDocument document =  canvas.raster.document;
		   // See if we have any node with link under (x,y)
                   SVGNode hitNode = document.root.nodeHitAt(canvas.raster,point);
                   if(hitNode == null)
                   {
                      System.out.println("Shapes: linkEvent: hitNode is not found");
                      break; // nothing to do
                   }
                   System.out.println("Shapes:linkEvent: hitNode is found" + hitNode);
                   break;

         } //switch

    }
}