Hi Shekhar,
Shekhar Bhati <[email protected]> wrote on 09/18/2009 09:34:24 AM:
> We are setting the width and height of the canvas with setAttributeNS
methods.
This must be done in the update manager's thread.
> We have a framework consisting of JSPs and javascripts.
> We have embedded SVG tags inside JSP using our graphics framework.
> So we are handling these prioperties (like height and width) inside
> the javascript.
> So SVG document is rendered through JSP.
I don't know much of anything about JSP. So I'm not sure if/how
you would resize the canvas.
> When the document is rendered and we see the image on the screen , at
> that time only that area which we can see is active but when we try to
> zoomout,pan or scroll, only then the new area appeared is not active .
How do you pan? Using the Scrollbars? When you say 'not active'
is stuff drawn or do you get blank screen in the new areas.
> At tht time when I refreshes the document then it gets active.
> So probably the new area is not getting active at runtime.
>
> What happens when we scroll or pan or zoomout? I mean is there
> something in JSVGViewer class( we have inherited it) or in the applet
> , which is called while performing these functions, so I will try
> putting that code inside UpdateManager thread.
The JSVGScrollPane changes the rendering transform on the
JSVGCanvas (setRenderingTransform). The Batik components obviously
follow the needed rules when doing this.
> On Fri, Sep 18, 2009 at 6:41 PM, <[email protected]> wrote:
> > Hi Shekhar,
> >
> > Shekhar Bhati <[email protected]> wrote on 09/18/2009 09:03:55
AM:
> >
> >> We have this applet inside a jsp and we are setting the size by using
> >> setAttributeNS("","height",..);
> >
> > Setting the size of what?
> >
> >> When I increase the size of the frame the new area which appears is
> >> not active but when I refersh the page ,then it gets active so I
> >> thought probably the canvas resizing is not happening at runtime so I
> >> thought of updatemanager thread.
> >
> > Is stuff being rendered in the new area? In squiggle the
> > canvas resizes as needed for the frame, perhaps you should look
> > at that code? (batik.apps.svgbrowser)
> >
> > Really I'm not going to be able to help you without a better
> > description of what you are doing.
> >
> >
> >> Please suggest.
> >>
> >>
> >> On Fri, Sep 18, 2009 at 4:04 PM, <[email protected]> wrote:
> >> > Hi Shekhar,
> >> >
> >> > Shekhar Bhati <[email protected]> wrote on 09/18/2009
04:50:52 AM:
> >> >
> >> >> I am facing an issue with activating the canvas on frame resizing.
> >> >> I am using batik to show complex images for my application. Here I
> >> >> have some objects for which I have a functionality of
> >> >> highlight/unhighlight the objects. It works like when I click on
> >> >> the object, it gets highlighted and when I click anywhere on the
> >> >> background it gets unhighlighted.
> >> >
> >> > How do you receive the click events on the 'background'?
Normally
> >> > this is done by having a 'white' or transparent rectangle that
covers
> >> > the entire canvas as the first thing in the SVG file (so it's
"below"
> >> > everything else).
> >> >
> >> >> We have inherited the class JSVGScrollPane for scrollbars as we
have
> >> >> huge images.
> >> >> The issue is that ,the area which I can see on the first go is
active
> >> >> , but when I scroll(pan/zoom out) then the new area which appears
is
> >> >> not active, to make it active I have to refresh the page, so the
> >> >> unhighlight does not work on that area which appears after
scrolling
> >> >> the page.
> >> >
> >> > It sounds like your background rect for handling unselect
doesn't
> >> > cover the entire contents of the canvas. This is fairly easy to
test
> >> > by simply 'tinting' your background rectangle so you can see it.
> >> > My guess is that you are using x="0" y="0" width="100%"
height="100%"
> >> > as the size of the rectangle - this will cover the 'initial'
viewport
> >> > but as you scroll or pan in/out it won't cover the full screen
anymore.
> >> >
> >> > The correct thing would be to calculate the actual dimensions
of
> >> > the document and use that to populate the rectangle dimensions.
The
> >> > simple thing to do is use something like:
> >> > 'x="-5000%" y="-5000%" width="10000%" height="10000%"'
> >> >
> >> >> I have heard about the update manager thread and also used it at
many
> >> >> places , but here I am not getting which code to put inside
> >> >> UpdateManager thread to make this hidden area active on scrolling
at
> >> >> runtime.
> >> >
> >> > I don't think this is your problem. You could potentially use
> >> > the UpdateManager to update your background rectangles
position/size
> >> > on scroll/zoom...
> >> >
> >> >
> >>
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> >
>
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