On Wed, Mar 23, 2011 at 4:33 PM, Piotr Przybylski piotr.prz@gmail.comwrote:
2011/3/23 Ammar Yasir ammaryasir.88@gmail.com:
On Wed, Mar 23, 2011 at 1:01 AM, Piotr Przybylski piotr.prz@gmail.com wrote:
2011/3/22 Marc Delisle marc@infomarc.info:
Ammar Yasir a écrit :
On Tue, Mar 22, 2011 at 11:24 PM, Marc Delisle <marc@infomarc.info mailto:marc@infomarc.info> wrote:
Ammar Yasir a écrit : > May I ask what quality aspect should this system focus on. It should be > correct, but what about trade off between system response timeand > functionality. Like for example, Zooming feature. Should it be like from > 1X->2X or should the image magnify gradually. Since pchart
will
produce > static images, some of these issues will be faced whiledesigning.
I would prefer a gradual zoom but haven't made any research abouthow to implement this. If pChart is not the best tool for this, you can look for a better one. The other day I mentionned pChart because we
are
currently using it (in phpMyAdmin 3.4) for static charts.So, is it like we can use any type of zoom but whenever the number of points in the screen fall below a certain number, we show labels?
I think it's more when the user ceases to see big clusters of data points and is able to perceive the distinct points.
Also, I think in pChart its not very straight forward to implement clickable items(click data points to view data row). We would have
to
use CSS with overlaid items.
OTOH if there is no open tool for a gradual zoom (web), going in increments (say, with buttons) will be fine.I also have never implemented such but I found something on the net, http://www.cssplay.co.uk/menu/image_magnifier2.html . I'll try to
look
for something like this.
Maybe SVG? Vector output would give users faster feedback (no need to generate big bitmaps on the server and send them) and allow for fluent scaling in browser. Recently even IE got native support, with the release of IE 9.
What about JpGraph?
JpGraph generates bitmaps, I am proposing SVG to avoid this and provide scaling in browser. With bitmap output any panning and zooming will require round trips to server and execution of (almost) the same query again. With SVG you can generate one image and process it in browser. It will give users faster feedback and save us from including another charting library.
I looked around if we can use SVG for this. One thing I found everyone
saying was that SVG integration with HTML, particularly with inline SVG is someway incomplete. Is it so? Also, i looked up on jquerySVG(http://keith-wood.name/svg.html). This can provide for most of the functionality required here.
-- Piotr Przybylski