Hi,
I hope this could be a trivial problem for someone on the list,
because it's not for me.
I am trying to use SVGTextElement methods getStartPositionOfChar and
getCharNumAtPosition to find out which character in a string was clicked
on (code below). The only thing I get though is a runtime error:
java.lang.RuntimeException: !!!
SVGOMTextContentElement.getStartPositionOfChar()
at
org.apache.batik.dom.svg.SVGOMTextContentElement.getStartPositionOfChar(
Unknown Source)
at
svgstuff.SVGTextSelectTest$OnMouseClick.handleEvent(SVGTextSelectTest.ja
va:155)
at
org.apache.batik.dom.events.EventSupport.fireEventListeners(Unknown
Source)
etc...
.
I'm using JDK 1.4 and batik-1.5beta4b on Windows XP Professional.
Finding the position could probably also be done with various
calculations of font size, mouse position, user coordinate system and so
forth, but I thought that if batik provided a method for it, it would be
easier (maybe not though).
Any pointers in the right direction would be appreciated
sincerely,
Randy Baron
*************** SVGMouseTracker.java source code:
package svgstuff;
/*
* SVGMouseTracker.java
*
* Created on October 10, 2002, 1:57 PM
*/
import java.io.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import org.apache.batik.script.Window;
import javax.swing.JFrame;
import javax.swing.JFileChooser;
import org.apache.batik.swing.JSVGCanvas;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.apache.batik.swing.svg.SVGLoadEventDispatcherAdapter;
import org.apache.batik.swing.svg.SVGLoadEventDispatcherEvent;
import org.w3c.dom.events.Event;
import org.w3c.dom.events.EventListener;
import org.w3c.dom.events.EventTarget;
import org.w3c.dom.events.MouseEvent;
import org.w3c.dom.svg.SVGElement;
import org.w3c.dom.NodeList;
import org.apache.batik.dom.svg.SVGOMTextElement;
import org.apache.batik.gvt.event.SelectionListener;
import org.apache.batik.gvt.TextNode;
import org.w3c.dom.svg.SVGPoint;
/**
*
* @author baron
*/
public class SVGTextSelectTest {
JFrame frame;
JSVGCanvas canvas;
Document document;
Window window;
/** Creates a new instance of SVGTextSelectTest */
public SVGTextSelectTest() {
// create java frame and batik svg canvas...
frame = new JFrame();
canvas = new JSVGCanvas();
// Force the canvas to always be dynamic even if the current
// document does not contain scripting or animation.
canvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
canvas.addSVGLoadEventDispatcherListener
(new SVGLoadEventDispatcherAdapter() {
public void svgLoadEventDispatchStarted
(SVGLoadEventDispatcherEvent e) {
// At this time the document is available...
document = canvas.getSVGDocument();
window = canvas.getUpdateManager().
getScriptingEnvironment().createWindow();
// Registers the listeners on the document
// just before the SVGLoad event is dispatched.
registerListeners();
// It is time to pack the frame.
frame.pack();
}
});
/** Pops up file chooser to choose the svg file to display */
frame.addWindowListener(new WindowAdapter() {
public void windowOpened(WindowEvent e) {
// The canvas is ready to load the base document
// now, from the AWT thread.
JFileChooser fc = new JFileChooser(".");
int choice = fc.showOpenDialog(canvas);
if (choice == JFileChooser.APPROVE_OPTION) {
File f = fc.getSelectedFile();
try {
canvas.setURI(f.toURL().toString());
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
});
/** For closing the window and exiting when the user clicks the
close box */
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
frame.getContentPane().add(canvas);
frame.setSize(800, 600);
frame.show();
System.out.println("Constructor finished.");
}
public static void main (String[] args) {
System.out.println("Testing test selection methods...");
SVGTextSelectTest mtrack = new SVGTextSelectTest();
}
public void registerListeners() {
// register a listener on the root of the main svg doc
Element maindoc = (Element) document.getDocumentElement();
EventTarget doctarg = (EventTarget) maindoc;
doctarg.addEventListener("click", new OnMouseClick(), false);
}
public class OnMouseClick implements EventListener {
public void handleEvent(Event evt) {
int mx, my;
int sx, sy;
int i = 0;
AnSVGPoint spoint;
// Get mouse click coordinates
MouseEvent mevt = (MouseEvent) evt;
mx = mevt.getClientX();
my = mevt.getClientY();
sx = mevt.getScreenX();
sy = mevt.getScreenY();
SVGElement targ = (SVGElement) mevt.getTarget();
System.out.println("Mouse X:" + mx + " Y: " + my);
System.out.println(" in screen coordinates - x: " + sx + "
y: " + sy);
System.out.println(" Type of event: " + mevt.getType());
System.out.println(" getTarget: " + mevt.getTarget());
System.out.println(" getCurrentTarget: " +
mevt.getCurrentTarget());
System.out.println(" Element id = " + targ.getId());
if (targ instanceof
org.apache.batik.dom.svg.SVGOMTextElement) {
SVGOMTextElement texttarg = (SVGOMTextElement) targ;
System.out.println("HIT SOME TEXT!");
// This block is not entirely relevant to the
getCharNumAtPosition problem; just for info
// see if there are any subnodes:
NodeList nlist = targ.getChildNodes();
System.out.println(" text node length: " +
nlist.getLength());
while (nlist.item(i) != null) {
System.out.println(" text node item " + i + ": " +
nlist.item(i++));
}
//ERROR OCCURS HERE ---
System.out.println(" ...and here comes the error");
// Try to get position of first character in the text
string with getStartPositionOfChar (returns an SVGPoint)
// SVGPoint interface is implemented below
// Using character zero for example (0 or 1, makes no
difference).
spoint = (AnSVGPoint)
texttarg.getStartPositionOfChar(0);
System.out.println(" try getStartPositionOfChar: " +
spoint.getX());
// Try to get character under the position where the
mouse was clicked.
spoint.setX((float) mx);
spoint.setY((float) my);
System.out.println(" try getCharNumAtPosition: " +
texttarg.getCharNumAtPosition(spoint) );
}
}
}
}
class AnSVGPoint implements SVGPoint {
float x, y;
public float getX() {
return this.x;
}
public float getY() {
return this.y;
}
public org.w3c.dom.svg.SVGPoint
matrixTransform(org.w3c.dom.svg.SVGMatrix sVGMatrix) {
// do nothing;
return this;
}
public void setX(float param) throws org.w3c.dom.DOMException {
this.x = param;
}
public void setY(float param) throws org.w3c.dom.DOMException {
this.y = param;
}
}
************** Sample SVG file which displays two lines of text:
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd";>
<svg width="400px" height="500px" viewBox="0 0 800 900"
xmlns="http://www.w3.org/2000/svg";>
<g id="sampletext" >
<text id="lineone" font-size="25" x="20" y="40" fill="purple">
ABCDEFGHIJKLMNOPQRSTUVWXYZ</text>
<text id="linetwo" font-size="25" x="20" y="80">
1234567890A0987654321</text>
</g>
</svg>
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