period of time such as, for example, when a project has just been created.

need to do those complicated computation anymore

for caption and curves

more easy to read
convolution function : f(x)=1-|x| with x in [-1;1] instead of (previously) f(x)=1

checked : it gives exactly the same image before and after this page
    diff old.png new.png -> nothing

display improvement: (special case) if the user did not provide any date requirement, we go a little further for the display

(example:)
orzel@berlioz orzel/hg/hgactivity% hg activity --width 1024 -h 1000
hg activity [OPTION]...

Creates a file called activity.png displaying the activity of the current
repository

options:

 -o --filename      name of the file created (default: activity.png)
 -w --width         Width of the graph in pixels (default: 800)
 -h --height        Height of the graph in pixels (default: 600)
    --datemin       Start date of the graph (yyyy-mm-dd)
    --datemax       End date of the graph (yyyy-mm-dd)
    --splitauthors  Display a different graph for every author
    --maxauthors    Maximum number of authors displayed (default: 4)

use "hg -v help activity" to show global options

The case where the arg is "None" is not handled by the function anyway

safety