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<?php |
/*======================================================================= |
// File: JPGRAPH_LOG.PHP |
// Description: Log scale plot extension for JpGraph |
// Created: 2001-01-08 |
// Author: Johan Persson (johanp@aditus.nu) |
// Ver: $Id: jpgraph_log.php,v 1.1 2004/06/15 10:13:19 jpm Exp $ |
// |
// License: This code is released under QPL |
// Copyright (C) 2001,2002 Johan Persson |
//======================================================================== |
*/ |
|
|
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 LogScale($min,$max,$type="y") { |
$this->LinearScale($min,$max,$type); |
$this->ticks = new LogTicks(); |
$this->name = 'log'; |
} |
|
//---------------- |
// PUBLIC METHODS |
|
// Translate between world and screen |
function Translate($a) { |
if( $a < 0 ) { |
JpGraphError::Raise("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( $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,$this->scale[0])); |
} |
|
function GetMaxVal() { |
if( function_exists("bcpow") ) |
return round(bcpow(10,$this->scale[1],15),14); |
else |
return round(pow(10,$this->scale[1])); |
} |
|
// Logarithmic autoscaling is much simplier since we just |
// set the min and max to logs of the min and max values. |
// Note that for log autoscale the "maxstep" the fourth argument |
// isn't used. This is just included to give the method the same |
// signature as the linear counterpart. |
function AutoScale(&$img,$min,$max,$dummy) { |
if( $min==0 ) $min=1; |
assert($max>0); |
$smin = floor(log10($min)); |
$smax = ceil(log10($max)); |
$this->Update($img,$smin,$smax); |
} |
//--------------- |
// PRIVATE METHODS |
} // Class |
|
//=================================================== |
// CLASS LogTicks |
// Description: |
//=================================================== |
class LogTicks extends Ticks{ |
var $label_logtype=LOGLABELS_MAGNITUDE; |
//--------------- |
// CONSTRUCTOR |
function LogTicks() { |
} |
//--------------- |
// PUBLIC METHODS |
function IsSpecified() { |
return true; |
} |
|
function SetLabelLogType($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::Raise('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; |
$this->maj_ticks_label[0]=$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->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]=$f($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->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; |
$this->maj_ticks_label[0]=$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 ) { |
$img->Line($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]=$f($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 |
$img->Line($xs,$pos,$xs,$a); |
} |
} |
return true; |
} |
} // Class |
/* EOF */ |
?> |