[Tutor] How to create variable length bar chart ??

[Alan Gauld]

"Asrarahmed Kadri" <ajkadri at googlemail.com> wrote in

> What I want is the height of the bar chart should be determined 
> dynamically
> (basically it means the length of the Y-axis), as per the number of
> data-items being displayed.

Hmm, I thought we ansdwered this recently...

Anyhow you just calculate it.
The height will be for an example with 3 bars:

3 times the height of a bar plus the inter bar space.

You might want to add some extra height on at the top.

Or you might want to have a bigger or smaller gap at top
and bottom than between the bars but basically its a case
of work out rthe pattern then calculate according to the data.

The worst case is:


                               <- top_gap
XXXXXXXXXXXXX

XXXXXXXXXXXX
                                <- gap_size
XXXXXXXXXXXXXX        <- bar_size
                                 <- bottom_gap
-------------------------------- <-- X axis


height = (bottom_gap+ top_gap) + ((N-1) * (bar_size+gap_size)) + 
bar_size

HTH,

-- 
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld