File

inc/pchart/pchart/class/pDraw.class.php, line 2526

Class

pDraw

Code

function processScale($XMin, $XMax, $MaxDivs, $Factors, $AxisID) 
 {
  $ScaleHeight = abs(ceil($XMax) -floor($XMin));

  if (isset($this->DataSet->Data ["Axis"][$AxisID]["Format"])) {
    $Format = $this->DataSet->Data ["Axis"][$AxisID]["Format"];
  }
  else {
    $Format = NULL;
  }

  if (isset($this->DataSet->Data ["Axis"][$AxisID]["Display"])) {
    $Mode = $this->DataSet->Data ["Axis"][$AxisID]["Display"];
  }
  else {
    $Mode = AXIS_FORMAT_DEFAULT;
  }

  $Scale = "";
  if ($XMin != $XMax) 
   {
    $Found = FALSE;
    $Rescaled = FALSE;
    $Scaled10Factor = .0001;
    $Result = 0;
    while (!$Found) 
     {
      foreach ($Factors as $Key => $Factor) 
       {
        if (!$Found) 
         {
          if (!($this->modulo($XMin, $Factor * $Scaled10Factor) == 0) || ($XMin != floor($XMin))) {
            $XMinRescaled = floor($XMin / ($Factor * $Scaled10Factor)) * $Factor * $Scaled10Factor;
          }
          else {
            $XMinRescaled = $XMin;
          }
          if (!($this->modulo($XMax, $Factor * $Scaled10Factor) == 0) || ($XMax != floor($XMax))) {
            $XMaxRescaled = floor($XMax / ($Factor * $Scaled10Factor)) * $Factor * $Scaled10Factor + ($Factor * $Scaled10Factor);
          }
          else {
            $XMaxRescaled = $XMax;
          }
          $ScaleHeightRescaled = abs($XMaxRescaled -$XMinRescaled);

          if (!$Found && floor($ScaleHeightRescaled / ($Factor * $Scaled10Factor)) <= $MaxDivs) {
            $Found = TRUE;
            $Rescaled = TRUE;
            $Result = $Factor * $Scaled10Factor;
          }
        }
      }
      $Scaled10Factor = $Scaled10Factor * 10;
    }

    /* ReCall Min / Max / Height */
    if ($Rescaled) {
      $XMin = $XMinRescaled;
      $XMax = $XMaxRescaled;
      $ScaleHeight = $ScaleHeightRescaled;
    }

    /* Compute rows size */
    $Rows = floor($ScaleHeight / $Result);
    if ($Rows == 0) {
      $Rows = 1;
    }
    $RowHeight = $ScaleHeight / $Rows;

    /* Return the results */
    $Scale ["Rows"] = $Rows;
    $Scale ["RowHeight"] = $RowHeight;
    $Scale ["XMin"] = $XMin;
    $Scale ["XMax"] = $XMax;

    /* Compute the needed decimals for the metric view to avoid repetition of the same X Axis labels */
    if ($Mode == AXIS_FORMAT_METRIC && $Format == NULL) 
     {
      $Done = FALSE;
      $GoodDecimals = 0;
      for ($Decimals = 0; $Decimals <= 10; $Decimals++) 
       {
        if (!$Done) 
         {
          $LastLabel = "zob";
          $ScaleOK = TRUE;
          for ($i = 0; $i <= $Rows; $i++) 
           {
            $Value = $XMin + $i * $RowHeight;
            $Label = $this->scaleFormat($Value, AXIS_FORMAT_METRIC, $Decimals);

            if ($LastLabel == $Label) {
              $ScaleOK = FALSE;
            }
            $LastLabel = $Label;
          }
          if ($ScaleOK) {
            $Done = TRUE;
            $GoodDecimals = $Decimals;
          }
        }
      }

      $Scale ["Format"] = $GoodDecimals;
    }
  }
  else 
   {
    /* If all values are the same we keep a +1/-1 scale */
    $Rows = 2;
    $XMin = $XMax -1;
    $XMax = $XMax + 1;
    $RowHeight = 1;

    /* Return the results */
    $Scale ["Rows"] = $Rows;
    $Scale ["RowHeight"] = $RowHeight;
    $Scale ["XMin"] = $XMin;
    $Scale ["XMax"] = $XMax;
  }

  return ($Scale);
}