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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 | <?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) Aditus Consulting. 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 ) |