Scaling a graph/chart perfectly

Selecting values for a scale for line and bar graphs is cumbersome many a times what should be the minimum value and what should be the maximum value is a question by many...

Here is the formula which might help you to scale a graph perfectly


$minval=floor($minval($minval<0?1.1:(1/1.1)/10)*10)

$maxval=ceil($maxval*($maxval>0?1.1:(1/1.1)/10)*10)


and expand/increment/step by 1.1 in above formula leads to a chart with nice space

//label spacing

$xlabelsteps=1;
if(count($data)>10)
{
    $xlabelsteps=ceil(count($data)/10); 
}

 //grid spacing


$xsteps=1;

if(count($data)>100)
{
      $xsteps=ceil(count($data)/100);
}

Tested on "Fusion charts"