Hi HardC0d3r,
hardc0d3r <[EMAIL PROTECTED]> wrote on 07/29/2008 10:07:13 PM:
> with your help, i can draw flicker free.. thanks..
Ok, good.
> cpu usage is more worse with larger canvas dimension, right? my canvas
is
> currently 10k pixels x 10k pixels and contains a lot of lines/paths,
texts
> and shapes (a map of a city).
You say the canvas is 10kx10k, that is rather large for any Monitor
I'm aware of :) So this is either hooked up to some sort of wall sized
display system (quite possible for a map of a city) or you are confusing
the effective document size with the canvas size. So are you showing
a small window into a 10Kx10K canvas or are you actually showing 10Kx10K
pixels to the user at once?
> i am planning to reduce the dimension by atleast half or use glass pane.
> and the question is : what would you recommend? stick with the
> overlay/immediateRepaint() and reduce the dimension of the svg or use
> glass pane?
If you are actually showing a 10K x 10K screen I would suggest
adding a new variant of immediateRepaint to the canvas. One problem
with the current immediateRepaint is that it always updates the
entire canvas. For normal situations this isn't a big deal since
this involves copying only a few Mb of data. In your case this is
close to half a Gig of data. I'm guessing that in most cases your
overlay only covers a small portion of the full 10Kx10K document
so adding a variant that allows you to specify the region that needs
the immediate repaint could significantly improve performance.
If you look at the current implementation of the method this
should be fairly simple to do and could make a very significant
performance improvement.
> here is the code of my interactor :
>
> import java.awt.BasicStroke;
> import java.awt.Color;
> import java.awt.Graphics;
> import java.awt.Graphics2D;
> import java.awt.Shape;
> import java.awt.event.InputEvent;
> import java.awt.event.MouseEvent;
> import java.awt.geom.AffineTransform;
> import java.awt.geom.Line2D;
> import java.awt.geom.NoninvertibleTransformException;
> import java.awt.geom.Point2D;
> import java.awt.geom.Rectangle2D;
> import org.apache.batik.bridge.BridgeContext;
> import org.apache.batik.gvt.GraphicsNode;
> import org.apache.batik.swing.JSVGCanvas;
> import org.apache.batik.swing.gvt.InteractorAdapter;
> import org.apache.batik.swing.gvt.JGVTComponent;
> import org.apache.batik.swing.gvt.Overlay;
> import org.w3c.dom.Element;
> import org.w3c.dom.svg.SVGLocatable;
> import org.w3c.dom.svg.SVGMatrix;
> import org.w3c.dom.svg.SVGPoint;
> import org.w3c.dom.svg.SVGRect;
> import org.w3c.dom.svg.SVGSVGElement;
>
> public class CustomInteractor extends InteractorAdapter {
>
> protected boolean finished = true;
> protected boolean isHandle = false;
> protected float xStart;
> protected float yStart;
> protected float xEnd;
> protected float yEnd;
> protected Line2D line;
> protected Shape shape;
> protected Overlay overlay = new LineOverlay();
> protected BasicStroke markerStroke = new BasicStroke(2,
> BasicStroke.CAP_SQUARE,
> BasicStroke.JOIN_MITER,
> 5,
> new float[]{5, 5}, 0);
> protected JGVTComponent source;
> JSVGCanvas at;
>
> @Override
> public boolean startInteraction(InputEvent ie) {
> return true;
> }
>
> @Override
> public boolean endInteraction() {
> return finished;
> }
>
> private Point2D getCanvasCoordinate(Point2D p) {
> Point2D pt = p;
> try {
> AffineTransform bt =
> source.getRenderingTransform().createInverse();
> return bt.transform(p, null);
> } catch (NoninvertibleTransformException ex) {
> return pt;
> }
> }
>
> private Element getElementAt(JGVTComponent source, float x, float y)
{
> Point2D p = getCanvasCoordinate(new Point2D.Float(x, y));
> GraphicsNode gn = source.getGraphicsNode().nodeHitAt(p);
> BridgeContext bc =
> ((JSVGCanvas)
source).getUpdateManager().getBridgeContext();
> return (Element) bc.getElement(gn);
> }
>
> public SVGPoint localPt(JGVTComponent c, Element el, float x, float
y) {
> SVGSVGElement svgRoot = ((JSVGCanvas)
> c).getSVGDocument().getRootElement();
> SVGMatrix mat = ((SVGLocatable) el).getScreenCTM();
> SVGMatrix imat = mat.inverse();
> SVGPoint cPt = svgRoot.createSVGPoint();
> cPt.setX(x);
> cPt.setY(y);
> cPt = cPt.matrixTransform(imat);
> return cPt;
> }
>
> @Override
> public void mousePressed(MouseEvent e) {
> JGVTComponent c = source = (JGVTComponent) e.getSource();
> at = ((JSVGCanvas) c);
> finished = false;
> line = null;
> Element domE = getElementAt(c, e.getX(), e.getY());
> if ("handle1".equals(domE.getAttribute("id"))) {
> isHandle = true;
> xStart = Float.parseFloat(domE.getAttribute("cx"));
> yStart = Float.parseFloat(domE.getAttribute("cy"));
> SVGRect bbox = ((SVGLocatable) domE).getBBox();
> shape = new Rectangle2D.Float(bbox.getX(), bbox.getY(),
> bbox.getWidth(), bbox.getHeight());
> } else {
> shape = null;
> }
> if (!c.getOverlays().contains(overlay)) {
> c.getOverlays().add(overlay);
> }
> c.immediateRepaint();
> }
>
> @Override
> public void mouseReleased(MouseEvent e) {
> JGVTComponent c = (JGVTComponent) e.getSource();
> finished = true;
> isHandle = false;
> }
>
> @Override
> public void mouseDragged(MouseEvent e) {
> JGVTComponent c = (JGVTComponent) e.getSource();
> if (isHandle) {
>
> Element domE = getElementAt(c, e.getX(), e.getY());
> SVGPoint pt = localPt(c,
> ((JSVGCanvas)c).getSVGDocument().getRootElement(), e.getX(), e.getY());
> xEnd = pt.getX();
> yEnd = pt.getY();
> line = new Line2D.Float(xStart, yStart, xEnd, yEnd);
> }
> c.immediateRepaint();
> }
>
> protected class LineOverlay implements Overlay {
>
> public void paint(Graphics g) {
> Graphics2D g2d = (Graphics2D) g;
> g2d.transform(at.getViewBoxTransform());
> g2d.setXORMode(Color.white);
> g2d.setColor(Color.red);
> g2d.setStroke(markerStroke);
>
> if (line != null) {
> g2d.draw(line);
> }
> if (shape != null) {
> g2d.draw(shape);
> }
> }
> }
> }
>
> --
> View this message in context: http://www.nabble.com/getting-the-
> element-in-svg-from-an-overlay-tp18301441p18724891.html
> Sent from the Batik - Users mailing list archive at Nabble.com.
>
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