Hi Thomas,
"Auzinger, Thomas" <[EMAIL PROTECTED]> wrote on 04/13/2007 03:40:46 PM:
> I'm new to Batik and used it for a prototype that displays waveforms
> and measurements. I'd like to learn some "best practices" for Batik.
> It works o.k., except for the following:
> 1. I wanted to have a big crosshair instead of the default
> cursor, so I defined one in the static SVG document that I put all
> my data in.:
Actually SVG supports a user defined cursor (subject to
platform restrictions).
> <g id="cursor" transform="translate(0,0)">
> <line stroke-width=".1" style="fill:none;stroke:red"
> y1="-10" y2="10" x1="0" x2="0"/>
> <line stroke-width=".1" style="fill:none;stroke:red"
> x1="-10" x2="10" y1="0" y2="0"/>
> </g>
> In my mousemotionlistener I change the translate(*,*) to whatever it
> needs to be. This works, but it is kind of sluggish, and the SVG
> cursor is always somewhat behind the system cursor:
It looks like you are modifying the document outside of the
Canvas RunnableQueue. This will cause the cursor to always lag.
Even if you fix this it will likely still lag a bit since it takes
a lot of work to render a cursor like this, but it should be better
and in particular it should now align when the cursor stops moving.
> public void moveCursor(MouseEvent e) {
> try {
> AffineTransform at = this.jsvgCanvas.getViewBoxTransform()
> .createInverse();
> Point2D p = new Point2D.Double(e.getX(), e.getY());
> p = at.transform(p, null);
> if (EcgApplet.cursorTransform == null) {
> Element cursor = this.jsvgCanvas.getSVGDocument()
> .getElementById("cursor");
> EcgApplet.cursorTransform = cursor.getAttributeNode(
> "transform");
> }
> EcgApplet.cursorTransform.setValue("translate(" + p.getX() +
","
> + p.getY() + ")");
> }
> catch (Exception ex) {
> ex.printStackTrace();
> System.out.println(ex);
> }
> }
> (If the design looks bad it's because it is, this prototype will be
> thrown away)
> 2. Displaying the measurements (i.e. drawing about 84 lines and
> 24 texts) takes about 2-3 seconds on a 3GHz dual core machine.
> The method below is called 12 times:
> public void displayItem(GlobalAnalysisItem ai, int beat, int height)
{
> long t0 = System.currentTimeMillis();
> String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
> SVGDocument doc = jsvgCanvas.getSVGDocument();
> int lArrow = 3;
> int x1 = ai.getOnSet().intValue() / 2;
> int x2 = ai.getOffSet().intValue() / 2;
> int yBase = 100;
> int yTop = -200;
> int yLine = -height;
> int yName = yLine - 2;
> int yValue = yLine + 5;
> String name = AnalysisItem.displayType(ai.getTypeID());
> String value = ai.getValue().intValue() + "";
> Element dimensioning1 = doc.getElementById("dimensioning");
> Element dimensioning = jsvgCanvas.getSVGDocument()
> .createElementNS(svgNS, "g");
> // calipers
> long t0a0 = System.currentTimeMillis();
> dimensioning.appendChild(createLine(x1, yBase, x1, yTop));
> long t0a = System.currentTimeMillis();
> System.err.println("displayItemA:" + (t0a - t0a0));
> dimensioning.appendChild(createLine(x2, yBase, x2, yTop));
> // line
> dimensioning.appendChild(createLine(x1, yLine, x2, yLine));
> // left arrow
> dimensioning.appendChild(createLine(x1, yLine, x1 + lArrow,
> yLine + (lArrow / 2)));
> dimensioning.appendChild(createLine(x1, yLine, x1 + lArrow,
> yLine - (lArrow / 2)));
> // right arrow
> dimensioning.appendChild(createLine(x2, yLine, x2 - lArrow,
> yLine + (lArrow / 2)));
> dimensioning.appendChild(createLine(x2, yLine, x2 - lArrow,
> yLine - (lArrow / 2)));
> // name
> dimensioning.appendChild(createText((x1 + x2) / 2, yName,
name));
> // value
> dimensioning.appendChild(createText((x1 + x2) / 2, yValue,
value));
> dimensioning1.appendChild(dimensioning);
> long t1 = System.currentTimeMillis();
> System.err.println("displayItem:" + (t1 - t0));
> }
> Is there anything blatantly wrong with what I'm doing? What can I do
better?
> Thanks,
> Thomas
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
