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259 lines
9.0 KiB
PHP
259 lines
9.0 KiB
PHP
<?php
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/* $Id: phplot_data.php,v 1.11 2004/01/24 22:18:11 migueldb Exp $
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*
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* Copyright (C) 2000 Afan Ottenheimer. Released under
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* the GPL and PHP licenses as stated in the the README file which
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* should have been included with this document.
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* This is an subclass for phplot.php and should only be
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* called after phplot.ini has been called. This extends
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* phplot by adding additional routines that can be used
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* to modify the data arrays.
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*
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* Data must be a *numerical* array, this is enforced in SetDataValues()
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*/
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require_once("phplot.php");
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class PHPlot_Data extends PHPlot
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{
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/*!
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* Constructor
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*/
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function PHPlot_Data($which_width=600, $which_height=400, $which_output_file=NULL, $which_input_file=NULL)
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{
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if (! isset($this->img)) {
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$this->PHPlot($which_width, $which_height, $which_output_file, $which_input_file);
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}
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}
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/*!
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* Will scale all data rows
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* Maybe later I will do a function that only scales some rows
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* if $even is TRUE, data will be scaled with "even" factors.
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* \note Original code by Thiemo Nagel
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*/
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function DoScaleData($even, $show_in_legend)
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{
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$offset = 0; // We use this not to read labels in text-data
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if ($this->data_type == 'text-data') {
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$offset = 1;
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} elseif ($this->data_type != 'data-data') {
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$this->DrawError('wrong data type!!');
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return FALSE;
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}
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// Determine maxima for each data row in array $max
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// Put maximum of the maxima in $maxmax
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$maxmax = 0;
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for($i=0; $i < $this->num_data_rows; $i++) {
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$rowsize = count($this->data[$i]);
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for ($j=$offset; $j < $rowsize; $j++) {
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if ($this->data[$i][$j] > @ $max[$j])
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$max[$j] = $this->data[$i][$j];
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if (@ $max[$j] > $maxmax)
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$maxmax = $max[$j];
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}
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}
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// determine amplification factor $amplify
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$end = count($max) + $offset;
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for ($i=$offset; $i < $end; $i++) {
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if ($max[$i] == 0 || $max[$i] == $maxmax) {
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$amplify[$i] = 1; // no divide by zero
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} else {
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if ($even) {
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$amp = pow(10,round(log10($maxmax / $max[$i]))-1);
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if ($amp * $max[$i] * 5 < $maxmax) {
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$amp *= 5;
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} elseif ($amp * $max[$i] * 2 < $maxmax) {
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$amp *= 2;
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}
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} else {
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$amp = $maxmax / $max[$i];
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$digits = floor(log10($amp));
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$amp = round($amp/pow(10,$digits-1))*pow(10,$digits-1);
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}
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$amplify[$i] = $amp;
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}
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if ($amplify[$i] != 1 && $show_in_legend)
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@ $this->legend[$i] .= "*$amplify[$i]";
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}
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// Amplify data
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// On my machine, running 1000 iterations over 1000 rows of 12 elements each,
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// the for loops were 43.2% faster (MBD)
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for ($i = 0; $i < $this->num_data_rows; $i++) {
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$rowsize = count($this->data[$i]);
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for ($j=$offset; $j < $rowsize; $j++) {
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$this->data[$i][$j] *= $amplify[$j];
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}
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}
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//Re-Scale Vertical Ticks if not already set
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if ( ! $this->y_tick_increment) {
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$this->SetYTickIncrement() ;
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}
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return TRUE;
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} //function DoScaleData
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/*!
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* Computes a moving average of strength $interval for
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* data row number $datarow, where 0 denotes the first
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* row of y-data.
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*
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* \param int datarow Index of the row whereupon to make calculations
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* \param int interval Number of elements to use in average ("strength")
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* \param bool show Whether to tell about the moving average in the legend.
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* \param string color Color for the line to be drawn. This color is darkened.
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* Can be named or #RRGGBB.
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* \param int width Width of the line to be drawn.
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*
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* \note Original idea by Theimo Nagel
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*/
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function DoMovingAverage($datarow, $interval, $show=TRUE, $color=NULL, $width=NULL)
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{
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$off = 1; // Skip record #0 (data label)
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$this->PadArrays();
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if ($interval == 0) {
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$this->DrawError('DoMovingAverage(): interval can\'t be 0');
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return FALSE;
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}
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if ($datarow >= $this->records_per_group) {
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$this->DrawError("DoMovingAverage(): Data row out of bounds ($datarow >= $this->records_per_group)");
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return FALSE;
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}
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if ($this->data_type == 'text-data') {
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// Ok. No need to set the offset to skip more records.
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} elseif ($this->data_type == 'data-data') {
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$off++; // first Y value at $data[][2]
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} else {
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$this->DrawError('DoMovingAverage(): wrong data type!!');
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return FALSE;
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}
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// Set color:
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if ($color) {
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array_push($this->ndx_data_colors, $this->SetIndexDarkColor($color));
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} else {
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array_push($this->ndx_data_colors, $this->SetIndexDarkColor($this->data_colors[$datarow]));
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}
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// Set line width:
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if ($width) {
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array_push($this->line_widths, $width);
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} else {
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array_push($this->line_widths, $this->line_widths[$datarow] * 2);
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}
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// Show in legend?
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if ($show) {
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$this->legend[$this->records_per_group-1] = "(MA[$datarow]:$interval)";
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}
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$datarow += $off;
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for ($i = 0; $i < $this->num_data_rows; $i++) {
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$storage[$i % $interval] = @ $this->data[$i][$datarow];
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$ma = array_sum($storage);
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$ma /= count($storage);
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array_push($this->data[$i], $ma); // Push the data onto the array
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$this->num_recs[$i]++; // Tell the drawing functions it is there
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}
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$this->records_per_group++;
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// $this->FindDataLimits();
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return TRUE;
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} //function DoMovingAverage()
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/**
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* Computes an exponentially smoothed moving average.
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* @param int perc "smoothing percentage"
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* FIXME!!! I haven't checked this.
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*/
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function DoExponentialMovingAverage($datarow, $perc, $show_in_legend)
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{
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if ($this->data_type == 'text-data') {
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$datarow++;
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} elseif ($this->data_type != 'data-data') {
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$this->DrawError('DoWeightedMovingAverage(): wrong data type!!');
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return FALSE;
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}
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if ($show_in_legend) {
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$this->legend[$datarow] .= " (MA: $interval)";
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}
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$storage[0] = $this->data[0][$datarow];
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for ($i=1;$i < $this->num_data_rows; $i++) {
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$storage[$i] = @ $storage[$i-1] + $perc * ($this->data[$i][$datarow] - $storage[$i-1]);
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$ma = array_sum($storage);
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$ma /= count($storage);
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$this->data[$i][$datarow] = $ma;
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}
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return TRUE;
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} // function DoExponentialMovingAverage()
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/*!
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* Removes the DataSet of number $index
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*/
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function DoRemoveDataSet($index)
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{
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$offset = 1;
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if ($this->data_type == 'data-data') {
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$offset++;
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} elseif ($this->data_type != 'text-data') {
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$this->DrawError('wrong data type!!');
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return FALSE;
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}
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$index += $offset;
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foreach ($this->data as $key=>$val) {
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foreach ($val as $key2=>$val2) {
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if ($key2 >= $index) {
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if (isset($this->data[$key][$key2+1])) {
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$this->data[$key][$key2] = $this->data[$key][$key2+1];
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} else {
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unset($this->data[$key][$key2]);
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}
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}
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}
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}
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} // function DoRemoveDataSet
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/*!
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* Computes row x divided by row y, stores the result in row x
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* and deletes row y
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*/
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function DoDivision($x,$y)
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{
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$offset = 1;
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if ($this->data_type == 'data-data') {
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$offset++;
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} elseif ($this->data_type != 'text-data') {
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$this->DrawError('wrong data type!!');
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return FALSE;
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}
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$x += $offset; $y += $offset;
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reset($this->data);
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while (list($key, $val) = each($this->data)) {
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if ($this->data[$key][$y] == 0) {
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$this->data[$key][$x] = 0;
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} else {
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$this->data[$key][$x] /= $this->data[$key][$y];
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}
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}
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$this->DoRemoveDataSet($y-$offset);
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} // function DoDivision
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} // class PHPlot_Data extends PHPlot
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?>
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