[reportlab-users] How to break a line graph?

[Tim Roberts]

David Frank wrote:

> Hi,

>

> I am making a line chart [using HorizontalLineChart()] and I have an

> array of values as the chartdata. Now, one of the arrays has some null

> values in it. Eg.,

>

> chartdata[2] = [100.2, 100.111, 50.2345, 50.0, None, None, None, None,

> None, None, 106.651199, 50.34, 206.651, 1978.788, 39.787, 978.787,

> 18.88, 1.65, 2.99, 2.0]

>

> Now the first 4 values (chartdata[0] to chartdata[3]) and the last 9

> values (chartdata[10] to chartdata[19]) are not 'None' and then the

> rest of the values are None. The graph is required to have a line

> drawn for the first 4 values, then again a line drawn for the last 9

> values. But, in the result, I get a line joining the values

> chartdata[3] and chartdata[10], making it appear to have a set of

> static values between these two values. Using zeros instead of None

> will still not solve the problem since it would appear that the values

> are zeros.


I'm not 100% sure after scanning the code, but it looks like this might
work if you break this yourself:

    chartdata[2] = [100.2, 100.111, 50.2345, 50.0, None, None, None, ... ]
    chartdata[3] = [None, None, None, None, None, None, None, None,
None, 106.651199, 50.34, ...]

However, the benefit of getting source code is that you can tweak it
yourself.  It wouldn't take too much work to make the code behave the
way you want.

-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.