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-<?php
-/*=======================================================================
- // File: JPGRAPH_LOG.PHP
- // Description: Log scale plot extension for JpGraph
- // Created: 2001-01-08
- // Ver: $Id: jpgraph_log.php 1106 2009-02-22 20:16:35Z ljp $
- //
- // Copyright (c) Asial Corporation. All rights reserved.
- //========================================================================
- */
-
-DEFINE('LOGLABELS_PLAIN',0);
-DEFINE('LOGLABELS_MAGNITUDE',1);
-
-//===================================================
-// CLASS LogScale
-// Description: Logarithmic scale between world and screen
-//===================================================
-class LogScale extends LinearScale {
- //---------------
- // CONSTRUCTOR
-
- // Log scale is specified using the log of min and max
- function __construct($min,$max,$type="y") {
- parent::__construct($min,$max,$type);
- $this->ticks = new LogTicks();
- $this->name = 'log';
- }
-
- //----------------
- // PUBLIC METHODS
-
- // Translate between world and screen
- function Translate($a) {
- if( !is_numeric($a) ) {
- if( $a != '' && $a != '-' && $a != 'x' ) {
- JpGraphError::RaiseL(11001);
- // ('Your data contains non-numeric values.');
- }
- return 1;
- }
- if( $a < 0 ) {
- JpGraphError::RaiseL(11002);
- //("Negative data values can not be used in a log scale.");
- exit(1);
- }
- if( $a==0 ) $a=1;
- $a=log10($a);
- return ceil($this->off + ($a*1.0 - $this->scale[0]) * $this->scale_factor);
- }
-
- // Relative translate (don't include offset) usefull when we just want
- // to know the relative position (in pixels) on the axis
- function RelTranslate($a) {
- if( !is_numeric($a) ) {
- if( $a != '' && $a != '-' && $a != 'x' ) {
- JpGraphError::RaiseL(11001);
- //('Your data contains non-numeric values.');
- }
- return 1;
- }
- if( $a==0 ) {
- $a=1;
- }
- $a=log10($a);
- return round(($a*1.0 - $this->scale[0]) * $this->scale_factor);
- }
-
- // Use bcpow() for increased precision
- function GetMinVal() {
- if( function_exists("bcpow") ) {
- return round(bcpow(10,$this->scale[0],15),14);
- }
- else {
- return round(pow(10,$this->scale[0]),14);
- }
- }
-
- function GetMaxVal() {
- if( function_exists("bcpow") ) {
- return round(bcpow(10,$this->scale[1],15),14);
- }
- else {
- return round(pow(10,$this->scale[1]),14);
- }
- }
-
- // Logarithmic autoscaling is much simplier since we just
- // set the min and max to logs of the min and max values.
- // Note that for log autoscale the "maxstep" the fourth argument
- // isn't used. This is just included to give the method the same
- // signature as the linear counterpart.
- function AutoScale($img,$min,$max,$maxsteps,$majend=true) {
- if( $min==0 ) $min=1;
-
- if( $max <= 0 ) {
- JpGraphError::RaiseL(11004);
- //('Scale error for logarithmic scale. You have a problem with your data values. The max value must be greater than 0. It is mathematically impossible to have 0 in a logarithmic scale.');
- }
- if( is_numeric($this->autoscale_min) ) {
- $smin = round($this->autoscale_min);
- $smax = ceil(log10($max));
- if( $min >= $max ) {
- JpGraphError::RaiseL(25071);//('You have specified a min value with SetAutoMin() which is larger than the maximum value used for the scale. This is not possible.');
- }
- }
- else {
- $smin = floor(log10($min));
- if( is_numeric($this->autoscale_max) ) {
- $smax = round($this->autoscale_max);
- if( $smin >= $smax ) {
- JpGraphError::RaiseL(25072);//('You have specified a max value with SetAutoMax() which is smaller than the miminum value used for the scale. This is not possible.');
- }
- }
- else
- $smax = ceil(log10($max));
- }
-
- $this->Update($img,$smin,$smax);
- }
- //---------------
- // PRIVATE METHODS
-} // Class
-
-//===================================================
-// CLASS LogTicks
-// Description:
-//===================================================
-class LogTicks extends Ticks{
- private $label_logtype=LOGLABELS_MAGNITUDE;
- private $ticklabels_pos = array();
- //---------------
- // CONSTRUCTOR
- function LogTicks() {
- }
- //---------------
- // PUBLIC METHODS
- function IsSpecified() {
- return true;
- }
-
- function SetLabelLogType($aType) {
- $this->label_logtype = $aType;
- }
-
- // For log scale it's meaningless to speak about a major step
- // We just return -1 to make the framework happy (specifically
- // StrokeLabels() )
- function GetMajor() {
- return -1;
- }
-
- function SetTextLabelStart($aStart) {
- JpGraphError::RaiseL(11005);
- //('Specifying tick interval for a logarithmic scale is undefined. Remove any calls to SetTextLabelStart() or SetTextTickInterval() on the logarithmic scale.');
- }
-
- function SetXLabelOffset($dummy) {
- // For log scales we dont care about XLabel offset
- }
-
- // Draw ticks on image "img" using scale "scale". The axis absolute
- // position in the image is specified in pos, i.e. for an x-axis
- // it specifies the absolute y-coord and for Y-ticks it specified the
- // absolute x-position.
- function Stroke($img,$scale,$pos) {
- $start = $scale->GetMinVal();
- $limit = $scale->GetMaxVal();
- $nextMajor = 10*$start;
- $step = $nextMajor / 10.0;
-
-
- $img->SetLineWeight($this->weight);
-
- if( $scale->type == "y" ) {
- // member direction specified if the ticks should be on
- // left or right side.
- $a=$pos + $this->direction*$this->GetMinTickAbsSize();
- $a2=$pos + $this->direction*$this->GetMajTickAbsSize();
-
- $count=1;
- $this->maj_ticks_pos[0]=$scale->Translate($start);
- $this->maj_ticklabels_pos[0]=$scale->Translate($start);
- if( $this->supress_first )
- $this->maj_ticks_label[0]="";
- else {
- if( $this->label_formfunc != '' ) {
- $f = $this->label_formfunc;
- $this->maj_ticks_label[0]=call_user_func($f,$start);
- }
- elseif( $this->label_logtype == LOGLABELS_PLAIN ) {
- $this->maj_ticks_label[0]=$start;
- }
- else {
- $this->maj_ticks_label[0]='10^'.round(log10($start));
- }
- }
- $i=1;
- for($y=$start; $y<=$limit; $y+=$step,++$count ) {
- $ys=$scale->Translate($y);
- $this->ticks_pos[]=$ys;
- $this->ticklabels_pos[]=$ys;
- if( $count % 10 == 0 ) {
- if( !$this->supress_tickmarks ) {
- if( $this->majcolor!="" ) {
- $img->PushColor($this->majcolor);
- $img->Line($pos,$ys,$a2,$ys);
- $img->PopColor();
- }
- else {
- $img->Line($pos,$ys,$a2,$ys);
- }
- }
-
- $this->maj_ticks_pos[$i]=$ys;
- $this->maj_ticklabels_pos[$i]=$ys;
-
- if( $this->label_formfunc != '' ) {
- $f = $this->label_formfunc;
- $this->maj_ticks_label[$i]=call_user_func($f,$nextMajor);
- }
- elseif( $this->label_logtype == 0 ) {
- $this->maj_ticks_label[$i]=$nextMajor;
- }
- else {
- $this->maj_ticks_label[$i]='10^'.round(log10($nextMajor));
- }
- ++$i;
- $nextMajor *= 10;
- $step *= 10;
- $count=1;
- }
- else {
- if( !$this->supress_tickmarks && !$this->supress_minor_tickmarks) {
- if( $this->mincolor!="" ) {
- $img->PushColor($this->mincolor);
- }
- $img->Line($pos,$ys,$a,$ys);
- if( $this->mincolor!="" ) {
- $img->PopColor();
- }
- }
- }
- }
- }
- else {
- $a=$pos - $this->direction*$this->GetMinTickAbsSize();
- $a2=$pos - $this->direction*$this->GetMajTickAbsSize();
- $count=1;
- $this->maj_ticks_pos[0]=$scale->Translate($start);
- $this->maj_ticklabels_pos[0]=$scale->Translate($start);
- if( $this->supress_first ) {
- $this->maj_ticks_label[0]="";
- }
- else {
- if( $this->label_formfunc != '' ) {
- $f = $this->label_formfunc;
- $this->maj_ticks_label[0]=call_user_func($f,$start);
- }
- elseif( $this->label_logtype == 0 ) {
- $this->maj_ticks_label[0]=$start;
- }
- else {
- $this->maj_ticks_label[0]='10^'.round(log10($start));
- }
- }
- $i=1;
- for($x=$start; $x<=$limit; $x+=$step,++$count ) {
- $xs=$scale->Translate($x);
- $this->ticks_pos[]=$xs;
- $this->ticklabels_pos[]=$xs;
- if( $count % 10 == 0 ) {
- if( !$this->supress_tickmarks ) {
- $img->Line($xs,$pos,$xs,$a2);
- }
- $this->maj_ticks_pos[$i]=$xs;
- $this->maj_ticklabels_pos[$i]=$xs;
-
- if( $this->label_formfunc != '' ) {
- $f = $this->label_formfunc;
- $this->maj_ticks_label[$i]=call_user_func($f,$nextMajor);
- }
- elseif( $this->label_logtype == 0 ) {
- $this->maj_ticks_label[$i]=$nextMajor;
- }
- else {
- $this->maj_ticks_label[$i]='10^'.round(log10($nextMajor));
- }
- ++$i;
- $nextMajor *= 10;
- $step *= 10;
- $count=1;
- }
- else {
- if( !$this->supress_tickmarks && !$this->supress_minor_tickmarks) {
- $img->Line($xs,$pos,$xs,$a);
- }
- }
- }
- }
- return true;
- }
-} // Class
-/* EOF */
-?>
generated by cgit (git 2.34.1) at 2025-06-15 22:06:14 +0000