CFCHART - Line Chart Questions - CF7

Question

Hi Folks -
I have a few questions about CFCHART in CF 7 and I am hoping
that maybe different users can answer them:
The following questions relate to creating a line chart.
1) Is there a way to control the gridlines yourself, and not
use the values for the lines that CFCHART presents?
1A) If you have to accept the values that CFCHART gives you,
is there a way to control the actual rounding of the values? Right
now I am getting 3 decimal places, and I would prefer whole
numbers.
2) Is there an issue with displaying negative values? I have
a chart that ranges from -255 to 100,000 and has 10 grid lines. But
the -255 does not display. I get 0, the rest of the lines, except
for the 9th line.
<cfchart chartheight="300" chartwidth="450" font="@Arial
Unicode MS" scalefrom="-255" scaleto="100000"
gridlines="10" xaxistitle="Month" yaxistitle="Total"
format="png" labelformat="number">
<cfchartseries type="line" serieslabel="Review">
<cfchartdata item="Jan" value="2569">
<cfchartdata item="Feb" value="65535">
<cfchartdata item="March" value="-57">
<cfchartdata item="April" value="75778">
<cfchartdata item="May" value="89955">
<cfchartdata item="June" value="39898">
<cfchartdata item="July" value="0">
<cfchartdata item="August" value="12560">
<cfchartdata item="Sept" value="-255">
<cfchartdata item="Oct" value="767">
<cfchartdata item="Nov" value="6868">
<cfchartdata item="Dec" value="37352">
</cfchartseries>
</cfchart>
Any and all questions and answers are appreciated.
Thanks,
Doug

Answer 1

You can specify scaleFrom and scaleTo by hardoced values or
dynamic variables and number of gridlines. If you not specified
first two attributes, then by default, the minimum is 0 or the
lowest negative chart data value, and the maximum is the largest
data value.
To avoid decimals in your case empirically find good
combination for your scale, for example from - 500 to 10 000 and
number of gridlines = 12.