source: trunk/client/modules/Elezioni/grafici/jpgraph_log.php@ 2

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1<?php
2/*=======================================================================
3// File: JPGRAPH_LOG.PHP
4// Description: Log scale plot extension for JpGraph
5// Created: 2001-01-08
6// Ver: $Id: jpgraph_log.php 957 2007-12-01 14:00:29Z ljp $
7//
8// Copyright (c) Aditus Consulting. All rights reserved.
9//========================================================================
10*/
11
12DEFINE('LOGLABELS_PLAIN',0);
13DEFINE('LOGLABELS_MAGNITUDE',1);
14
15//===================================================
16// CLASS LogScale
17// Description: Logarithmic scale between world and screen
18//===================================================
19class LogScale extends LinearScale {
20//---------------
21// CONSTRUCTOR
22
23 // Log scale is specified using the log of min and max
24 function LogScale($min,$max,$type="y") {
25 $this->LinearScale($min,$max,$type);
26 $this->ticks = new LogTicks();
27 $this->name = 'log';
28 }
29
30//----------------
31// PUBLIC METHODS
32
33 // Translate between world and screen
34 function Translate($a) {
35 if( !is_numeric($a) ) {
36 if( $a != '' && $a != '-' && $a != 'x' )
37 JpGraphError::RaiseL(11001);
38//('Your data contains non-numeric values.');
39 return 1;
40 }
41 if( $a < 0 ) {
42 JpGraphError::RaiseL(11002);
43//("Negative data values can not be used in a log scale.");
44 exit(1);
45 }
46 if( $a==0 ) $a=1;
47 $a=log10($a);
48 return ceil($this->off + ($a*1.0 - $this->scale[0]) * $this->scale_factor);
49 }
50
51 // Relative translate (don't include offset) usefull when we just want
52 // to know the relative position (in pixels) on the axis
53 function RelTranslate($a) {
54 if( !is_numeric($a) ) {
55 if( $a != '' && $a != '-' && $a != 'x' )
56 JpGraphError::RaiseL(11001);
57//('Your data contains non-numeric values.');
58 return 1;
59 }
60 if( $a==0 ) $a=1;
61 $a=log10($a);
62 return round(($a*1.0 - $this->scale[0]) * $this->scale_factor);
63 }
64
65 // Use bcpow() for increased precision
66 function GetMinVal() {
67 if( function_exists("bcpow") )
68 return round(bcpow(10,$this->scale[0],15),14);
69 else
70 return round(pow(10,$this->scale[0]),14);
71 }
72
73 function GetMaxVal() {
74 if( function_exists("bcpow") )
75 return round(bcpow(10,$this->scale[1],15),14);
76 else
77 return round(pow(10,$this->scale[1]),14);
78 }
79
80 // Logarithmic autoscaling is much simplier since we just
81 // set the min and max to logs of the min and max values.
82 // Note that for log autoscale the "maxstep" the fourth argument
83 // isn't used. This is just included to give the method the same
84 // signature as the linear counterpart.
85 function AutoScale($img,$min,$max,$maxsteps,$majend=true) {
86 if( $min==0 ) $min=1;
87
88 if( $max <= 0 ) {
89 JpGraphError::RaiseL(11004);
90//('Scale error for logarithmic scale. You have a problem with your data values. The max value must be greater than 0. It is mathematically impossible to have 0 in a logarithmic scale.');
91 }
92 if( is_numeric($this->autoscale_min) ) {
93 $smin = round($this->autoscale_min);
94 $smax = ceil(log10($max));
95 if( $min >= $max ) {
96 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.');
97 }
98 }
99 else {
100 $smin = floor(log10($min));
101 if( is_numeric($this->autoscale_max) ) {
102 $smax = round($this->autoscale_max);
103 if( $smin >= $smax ) {
104 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.');
105 }
106 }
107 else
108 $smax = ceil(log10($max));
109 }
110
111 $this->Update($img,$smin,$smax);
112 }
113//---------------
114// PRIVATE METHODS
115} // Class
116
117//===================================================
118// CLASS LogTicks
119// Description:
120//===================================================
121class LogTicks extends Ticks{
122 private $label_logtype=LOGLABELS_MAGNITUDE;
123 private $ticklabels_pos = array();
124//---------------
125// CONSTRUCTOR
126 function LogTicks() {
127 }
128//---------------
129// PUBLIC METHODS
130 function IsSpecified() {
131 return true;
132 }
133
134 function SetLabelLogType($aType) {
135 $this->label_logtype = $aType;
136 }
137
138 // For log scale it's meaningless to speak about a major step
139 // We just return -1 to make the framework happy (specifically
140 // StrokeLabels() )
141 function GetMajor() {
142 return -1;
143 }
144
145 function SetTextLabelStart($aStart) {
146 JpGraphError::RaiseL(11005);
147//('Specifying tick interval for a logarithmic scale is undefined. Remove any calls to SetTextLabelStart() or SetTextTickInterval() on the logarithmic scale.');
148 }
149
150 function SetXLabelOffset($dummy) {
151 // For log scales we dont care about XLabel offset
152 }
153
154 // Draw ticks on image "img" using scale "scale". The axis absolute
155 // position in the image is specified in pos, i.e. for an x-axis
156 // it specifies the absolute y-coord and for Y-ticks it specified the
157 // absolute x-position.
158 function Stroke($img,$scale,$pos) {
159 $start = $scale->GetMinVal();
160 $limit = $scale->GetMaxVal();
161 $nextMajor = 10*$start;
162 $step = $nextMajor / 10.0;
163
164
165 $img->SetLineWeight($this->weight);
166
167 if( $scale->type == "y" ) {
168 // member direction specified if the ticks should be on
169 // left or right side.
170 $a=$pos + $this->direction*$this->GetMinTickAbsSize();
171 $a2=$pos + $this->direction*$this->GetMajTickAbsSize();
172
173 $count=1;
174 $this->maj_ticks_pos[0]=$scale->Translate($start);
175 $this->maj_ticklabels_pos[0]=$scale->Translate($start);
176 if( $this->supress_first )
177 $this->maj_ticks_label[0]="";
178 else {
179 if( $this->label_formfunc != '' ) {
180 $f = $this->label_formfunc;
181 $this->maj_ticks_label[0]=call_user_func($f,$start);
182 }
183 elseif( $this->label_logtype == LOGLABELS_PLAIN )
184 $this->maj_ticks_label[0]=$start;
185 else
186 $this->maj_ticks_label[0]='10^'.round(log10($start));
187 }
188 $i=1;
189 for($y=$start; $y<=$limit; $y+=$step,++$count ) {
190 $ys=$scale->Translate($y);
191 $this->ticks_pos[]=$ys;
192 $this->ticklabels_pos[]=$ys;
193 if( $count % 10 == 0 ) {
194 if( !$this->supress_tickmarks ) {
195 if( $this->majcolor!="" ) {
196 $img->PushColor($this->majcolor);
197 $img->Line($pos,$ys,$a2,$ys);
198 $img->PopColor();
199 }
200 else
201 $img->Line($pos,$ys,$a2,$ys);
202 }
203
204 $this->maj_ticks_pos[$i]=$ys;
205 $this->maj_ticklabels_pos[$i]=$ys;
206
207 if( $this->label_formfunc != '' ) {
208 $f = $this->label_formfunc;
209 $this->maj_ticks_label[$i]=call_user_func($f,$nextMajor);
210 }
211 elseif( $this->label_logtype == 0 )
212 $this->maj_ticks_label[$i]=$nextMajor;
213 else
214 $this->maj_ticks_label[$i]='10^'.round(log10($nextMajor));
215 ++$i;
216 $nextMajor *= 10;
217 $step *= 10;
218 $count=1;
219 }
220 else {
221 if( !$this->supress_tickmarks && !$this->supress_minor_tickmarks) {
222 if( $this->mincolor!="" ) $img->PushColor($this->mincolor);
223 $img->Line($pos,$ys,$a,$ys);
224 if( $this->mincolor!="" ) $img->PopColor();
225 }
226 }
227 }
228 }
229 else {
230 $a=$pos - $this->direction*$this->GetMinTickAbsSize();
231 $a2=$pos - $this->direction*$this->GetMajTickAbsSize();
232 $count=1;
233 $this->maj_ticks_pos[0]=$scale->Translate($start);
234 $this->maj_ticklabels_pos[0]=$scale->Translate($start);
235 if( $this->supress_first )
236 $this->maj_ticks_label[0]="";
237 else {
238 if( $this->label_formfunc != '' ) {
239 $f = $this->label_formfunc;
240 $this->maj_ticks_label[0]=call_user_func($f,$start);
241 }
242 elseif( $this->label_logtype == 0 )
243 $this->maj_ticks_label[0]=$start;
244 else
245 $this->maj_ticks_label[0]='10^'.round(log10($start));
246 }
247 $i=1;
248 for($x=$start; $x<=$limit; $x+=$step,++$count ) {
249 $xs=$scale->Translate($x);
250 $this->ticks_pos[]=$xs;
251 $this->ticklabels_pos[]=$xs;
252 if( $count % 10 == 0 ) {
253 if( !$this->supress_tickmarks ) {
254 $img->Line($xs,$pos,$xs,$a2);
255 }
256 $this->maj_ticks_pos[$i]=$xs;
257 $this->maj_ticklabels_pos[$i]=$xs;
258
259 if( $this->label_formfunc != '' ) {
260 $f = $this->label_formfunc;
261 $this->maj_ticks_label[$i]=call_user_func($f,$nextMajor);
262 }
263 elseif( $this->label_logtype == 0 )
264 $this->maj_ticks_label[$i]=$nextMajor;
265 else
266 $this->maj_ticks_label[$i]='10^'.round(log10($nextMajor));
267 ++$i;
268 $nextMajor *= 10;
269 $step *= 10;
270 $count=1;
271 }
272 else {
273 if( !$this->supress_tickmarks && !$this->supress_minor_tickmarks) {
274 $img->Line($xs,$pos,$xs,$a);
275 }
276 }
277 }
278 }
279 return true;
280 }
281} // Class
282/* EOF */
283?>
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