function doAutoScaleYAxis()
{
//Check if we should autoscale y-axis
if (!$this->yscale->IsSpecified() && count($this->plots) > 0) {
list($min, $max) = $this->GetPlotsYMinMax($this->plots);
$lres = $this->GetLinesYMinMax($this->lines);
if (is_array($lres)) {
list($linmin, $linmax) = $lres;
$min = min($min, $linmin);
$max = max($max, $linmax);
}
$tres = $this->GetTextsYMinMax();
if (is_array($tres)) {
list($tmin, $tmax) = $tres;
$min = min($min, $tmin);
$max = max($max, $tmax);
}
$this->yscale->AutoScale($this->img, $min, $max, $this->img->plotheight / $this->ytick_factor);
} elseif ($this->yscale->IsSpecified() && ($this->yscale->auto_ticks || !$this->yscale->ticks->IsSpecified())) {
// The tick calculation will use the user suplied min/max values to determine
// the ticks. If auto_ticks is false the exact user specifed min and max
// values will be used for the scale.
// If auto_ticks is true then the scale might be slightly adjusted
// so that the min and max values falls on an even major step.
$min = $this->yscale->scale[0];
$max = $this->yscale->scale[1];
$this->yscale->AutoScale($this->img, $min, $max, $this->img->plotheight / $this->ytick_factor, $this->yscale->auto_ticks);
// Now make sure we show enough precision to accurate display the
// labels. If this is not done then the user might end up with
// a scale that might actually start with, say 13.5, butdue to rounding
// the scale label will ony show 14.
if (abs(floor($min) - $min) > 0) {
// If the user has set a format then we bail out
if ($this->yscale->ticks->label_formatstr == '' && $this->yscale->ticks->label_dateformatstr == '') {
$this->yscale->ticks->precision = abs(floor(log10(abs(floor($min) - $min)))) + 1;
}
}
}
}
