Hi Thomas,
To update the zoom in transform in canvas, i have translated the zoomed in
transform. but still there is some minor problem.
After zoomed in to large size, i moved the horizontal and vertical scroll
bars to right and bottom corner. Now if i tried to zoomout the document,
scroll bars not moving properly. Herewith i have attached the sample
application. Please let me know where i am doing the mistake.
import javax.swing.JFrame;
import java.awt.BorderLayout;
import javax.swing.JPanel;
import java.awt.*;
import javax.swing.JButton;
import org.apache.batik.swing.JSVGCanvas;
import org.w3c.dom.svg.SVGDocument;
import org.w3c.dom.DOMImplementation;
import org.apache.batik.dom.svg.SVGDOMImplementation;
import org.apache.batik.swing.gvt.GVTTreeRendererAdapter;
import org.w3c.dom.events.EventTarget;
import org.w3c.dom.svg.SVGSVGElement;
import org.w3c.dom.events.EventListener;
import org.w3c.dom.events.Event;
import org.apache.batik.swing.gvt.GVTTreeRendererEvent;
import org.w3c.dom.DOMException;
import org.w3c.dom.Element;
import org.apache.batik.swing.JSVGScrollPane;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.geom.AffineTransform;
import org.apache.batik.util.SVGConstants;
import org.apache.batik.bridge.ViewBox;
import javax.swing.JDialog;
import java.awt.geom.Rectangle2D;
class ExFrame extends JFrame{
static String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
JSVGCanvas svgCanvas = new JSVGCanvas();
JButton zoomInButton = new JButton("ZoomIn");
JButton zoomOutButton = new JButton("ZoomOut");
public static void main(String args[]) {
ExFrame frame = new ExFrame();
frame.setDefaultCloseOperation(JDialog.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
public ExFrame() {
this.getContentPane().setLayout(new BorderLayout());
JPanel jPanel1 = new JPanel();
jPanel1.add(zoomInButton);
jPanel1.add(zoomOutButton);
zoomInButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
AffineTransform rat = svgCanvas.getRenderingTransform();
AffineTransform at = AffineTransform.getScaleInstance(1.1,
1.1);
AffineTransform t = new AffineTransform(at);
t.concatenate(rat);
Rectangle2D viewBox = getViewBoxRect();
AffineTransform vTx = svgCanvas.getViewBoxTransform();
final Rectangle docSize =
vTx.createTransformedShape(viewBox).getBounds();
Rectangle r2d =
t.createTransformedShape(viewBox).getBounds();
int tx = 0, ty = 0;
tx = docSize.x - r2d.x;
ty = docSize.y - r2d.y;
t.translate( -tx, -ty);
svgCanvas.setRenderingTransform(t);
}
});
zoomOutButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
AffineTransform rat = svgCanvas.getRenderingTransform();
AffineTransform at = AffineTransform.getScaleInstance(.9,
.9);
AffineTransform t = new AffineTransform(at);
t.concatenate(rat);
Rectangle2D viewBox = getViewBoxRect();
AffineTransform vTx = svgCanvas.getViewBoxTransform();
final Rectangle docSize =
vTx.createTransformedShape(viewBox).getBounds();
Rectangle r2d =
t.createTransformedShape(viewBox).getBounds();
int tx = 0, ty = 0;
tx = docSize.x - r2d.x;
ty = docSize.y - r2d.y;
t.translate( -tx, -ty);
svgCanvas.setRenderingTransform(t);
}
});
DOMImplementation impl =
SVGDOMImplementation.getDOMImplementation();
SVGDocument doc = (SVGDocument)impl.createDocument(svgNS, "svg",
null);
svgCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
JSVGScrollPane graphPane = new JSVGScrollPane(svgCanvas);
svgCanvas.setDocument(doc);
graphPane.setPreferredSize(new Dimension(400, 400));
this.getContentPane().add(graphPane, java.awt.BorderLayout.CENTER);
this.getContentPane().add(jPanel1, java.awt.BorderLayout.NORTH);
registerListeners();
}
public void registerListeners() {
svgCanvas.addGVTTreeRendererListener(new GVTTreeRendererAdapter() {
public void gvtRenderingPrepare(GVTTreeRendererEvent e) {
}
public void gvtRenderingCompleted(GVTTreeRendererEvent e) {
resizeCircle();
}
});
SVGDocument doc = svgCanvas.getSVGDocument();
SVGSVGElement svgRoot = doc.getRootElement();
EventTarget t = (EventTarget)svgRoot;
t.addEventListener("SVGLoad", new OnLoadAction(), false);
}
public class OnLoadAction implements EventListener {
public void handleEvent(Event evt) {
}
}
protected Rectangle2D getViewBoxRect() {
SVGSVGElement el = svgCanvas.getSVGDocument().getRootElement();
String viewBoxStr = el.getAttributeNS(null,
SVGConstants.SVG_VIEW_BOX_ATTRIBUTE);
float[] rect = ViewBox.parseViewBoxAttribute(el, viewBoxStr);
return new Rectangle2D.Float(rect[0], rect[1], rect[2], rect[3]);
}
private void resizeCircle() throws DOMException {
try {
SVGDocument doc = svgCanvas.getSVGDocument();
doc.getRootElement().setAttribute("width", "" + 100);
doc.getRootElement().setAttribute("height", "" + 100);
doc.getRootElement().setAttribute("viewBox", "0 0 " + 100 + " "
+ 100);
doc.getRootElement().setAttribute("preserveAspectRatio",
"none");
Element rect =
doc.createElementNS(SVGDOMImplementation.SVG_NAMESPACE_URI, "rect");
rect.setAttributeNS(null, "id", "rec");
rect.setAttributeNS(null, "x", "25");
rect.setAttributeNS(null, "y", "25");
rect.setAttributeNS(null, "width", "50");
rect.setAttributeNS(null, "height", "50");
rect.setAttributeNS(null, "style", "fill:red; stroke:green");
doc.getRootElement().appendChild(rect);
} catch (Exception e) {}
}
}
Thanks in advance.
Regards,
Selva
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