1 | <?php |
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2 | /*======================================================================= |
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3 | // File: JPGRAPH_LOG.PHP |
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4 | // Description: Log scale plot extension for JpGraph |
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5 | // Created: 2001-01-08 |
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6 | // Ver: $Id: jpgraph_log.php 1106 2009-02-22 20:16:35Z ljp $ |
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7 | // |
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8 | // Copyright (c) Asial Corporation. All rights reserved. |
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9 | //======================================================================== |
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10 | */ |
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11 | |
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12 | DEFINE('LOGLABELS_PLAIN',0); |
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13 | DEFINE('LOGLABELS_MAGNITUDE',1); |
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14 | |
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15 | //=================================================== |
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16 | // CLASS LogScale |
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17 | // Description: Logarithmic scale between world and screen |
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18 | //=================================================== |
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19 | class LogScale extends LinearScale { |
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20 | //--------------- |
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21 | // CONSTRUCTOR |
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22 | |
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23 | // Log scale is specified using the log of min and max |
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24 | function __construct($min,$max,$type="y") { |
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25 | parent::__construct($min,$max,$type); |
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26 | $this->ticks = new LogTicks(); |
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27 | $this->name = 'log'; |
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28 | } |
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29 | |
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30 | //---------------- |
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31 | // PUBLIC METHODS |
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32 | |
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33 | // Translate between world and screen |
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34 | function Translate($a) { |
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35 | if( !is_numeric($a) ) { |
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36 | if( $a != '' && $a != '-' && $a != 'x' ) { |
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37 | JpGraphError::RaiseL(11001); |
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38 | // ('Your data contains non-numeric values.'); |
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39 | } |
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40 | return 1; |
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41 | } |
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42 | if( $a < 0 ) { |
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43 | JpGraphError::RaiseL(11002); |
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44 | //("Negative data values can not be used in a log scale."); |
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45 | exit(1); |
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46 | } |
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47 | if( $a==0 ) $a=1; |
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48 | $a=log10($a); |
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49 | return ceil($this->off + ($a*1.0 - $this->scale[0]) * $this->scale_factor); |
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50 | } |
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51 | |
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52 | // Relative translate (don't include offset) usefull when we just want |
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53 | // to know the relative position (in pixels) on the axis |
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54 | function RelTranslate($a) { |
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55 | if( !is_numeric($a) ) { |
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56 | if( $a != '' && $a != '-' && $a != 'x' ) { |
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57 | JpGraphError::RaiseL(11001); |
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58 | //('Your data contains non-numeric values.'); |
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59 | } |
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60 | return 1; |
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61 | } |
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62 | if( $a==0 ) { |
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63 | $a=1; |
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64 | } |
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65 | $a=log10($a); |
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66 | return round(($a*1.0 - $this->scale[0]) * $this->scale_factor); |
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67 | } |
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68 | |
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69 | // Use bcpow() for increased precision |
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70 | function GetMinVal() { |
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71 | if( function_exists("bcpow") ) { |
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72 | return round(bcpow(10,$this->scale[0],15),14); |
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73 | } |
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74 | else { |
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75 | return round(pow(10,$this->scale[0]),14); |
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76 | } |
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77 | } |
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78 | |
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79 | function GetMaxVal() { |
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80 | if( function_exists("bcpow") ) { |
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81 | return round(bcpow(10,$this->scale[1],15),14); |
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82 | } |
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83 | else { |
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84 | return round(pow(10,$this->scale[1]),14); |
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85 | } |
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86 | } |
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87 | |
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88 | // Logarithmic autoscaling is much simplier since we just |
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89 | // set the min and max to logs of the min and max values. |
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90 | // Note that for log autoscale the "maxstep" the fourth argument |
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91 | // isn't used. This is just included to give the method the same |
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92 | // signature as the linear counterpart. |
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93 | function AutoScale($img,$min,$max,$maxsteps,$majend=true) { |
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94 | if( $min==0 ) $min=1; |
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95 | |
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96 | if( $max <= 0 ) { |
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97 | JpGraphError::RaiseL(11004); |
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98 | //('Scale error for logarithmic scale. You have a problem with your data values. The max value must be greater than 0. It is mathematically impossible to have 0 in a logarithmic scale.'); |
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99 | } |
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100 | if( is_numeric($this->autoscale_min) ) { |
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101 | $smin = round($this->autoscale_min); |
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102 | $smax = ceil(log10($max)); |
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103 | if( $min >= $max ) { |
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104 | 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.'); |
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105 | } |
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106 | } |
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107 | else { |
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108 | $smin = floor(log10($min)); |
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109 | if( is_numeric($this->autoscale_max) ) { |
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110 | $smax = round($this->autoscale_max); |
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111 | if( $smin >= $smax ) { |
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112 | 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.'); |
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113 | } |
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114 | } |
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115 | else |
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116 | $smax = ceil(log10($max)); |
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117 | } |
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118 | |
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119 | $this->Update($img,$smin,$smax); |
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120 | } |
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121 | //--------------- |
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122 | // PRIVATE METHODS |
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123 | } // Class |
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124 | |
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125 | //=================================================== |
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126 | // CLASS LogTicks |
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127 | // Description: |
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128 | //=================================================== |
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129 | class LogTicks extends Ticks{ |
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130 | private $label_logtype=LOGLABELS_MAGNITUDE; |
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131 | private $ticklabels_pos = array(); |
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132 | //--------------- |
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133 | // CONSTRUCTOR |
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134 | function LogTicks() { |
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135 | } |
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136 | //--------------- |
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137 | // PUBLIC METHODS |
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138 | function IsSpecified() { |
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139 | return true; |
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140 | } |
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141 | |
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142 | function SetLabelLogType($aType) { |
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143 | $this->label_logtype = $aType; |
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144 | } |
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145 | |
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146 | // For log scale it's meaningless to speak about a major step |
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147 | // We just return -1 to make the framework happy (specifically |
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148 | // StrokeLabels() ) |
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149 | function GetMajor() { |
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150 | return -1; |
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151 | } |
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152 | |
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153 | function SetTextLabelStart($aStart) { |
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154 | JpGraphError::RaiseL(11005); |
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155 | //('Specifying tick interval for a logarithmic scale is undefined. Remove any calls to SetTextLabelStart() or SetTextTickInterval() on the logarithmic scale.'); |
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156 | } |
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157 | |
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158 | function SetXLabelOffset($dummy) { |
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159 | // For log scales we dont care about XLabel offset |
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160 | } |
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161 | |
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162 | // Draw ticks on image "img" using scale "scale". The axis absolute |
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163 | // position in the image is specified in pos, i.e. for an x-axis |
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164 | // it specifies the absolute y-coord and for Y-ticks it specified the |
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165 | // absolute x-position. |
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166 | function Stroke($img,$scale,$pos) { |
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167 | $start = $scale->GetMinVal(); |
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168 | $limit = $scale->GetMaxVal(); |
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169 | $nextMajor = 10*$start; |
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170 | $step = $nextMajor / 10.0; |
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171 | |
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172 | |
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173 | $img->SetLineWeight($this->weight); |
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174 | |
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175 | if( $scale->type == "y" ) { |
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176 | // member direction specified if the ticks should be on |
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177 | // left or right side. |
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178 | $a=$pos + $this->direction*$this->GetMinTickAbsSize(); |
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179 | $a2=$pos + $this->direction*$this->GetMajTickAbsSize(); |
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180 | |
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181 | $count=1; |
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182 | $this->maj_ticks_pos[0]=$scale->Translate($start); |
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183 | $this->maj_ticklabels_pos[0]=$scale->Translate($start); |
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184 | if( $this->supress_first ) |
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185 | $this->maj_ticks_label[0]=""; |
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186 | else { |
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187 | if( $this->label_formfunc != '' ) { |
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188 | $f = $this->label_formfunc; |
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189 | $this->maj_ticks_label[0]=call_user_func($f,$start); |
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190 | } |
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191 | elseif( $this->label_logtype == LOGLABELS_PLAIN ) { |
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192 | $this->maj_ticks_label[0]=$start; |
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193 | } |
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194 | else { |
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195 | $this->maj_ticks_label[0]='10^'.round(log10($start)); |
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196 | } |
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197 | } |
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198 | $i=1; |
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199 | for($y=$start; $y<=$limit; $y+=$step,++$count ) { |
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200 | $ys=$scale->Translate($y); |
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201 | $this->ticks_pos[]=$ys; |
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202 | $this->ticklabels_pos[]=$ys; |
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203 | if( $count % 10 == 0 ) { |
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204 | if( !$this->supress_tickmarks ) { |
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205 | if( $this->majcolor!="" ) { |
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206 | $img->PushColor($this->majcolor); |
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207 | $img->Line($pos,$ys,$a2,$ys); |
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208 | $img->PopColor(); |
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209 | } |
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210 | else { |
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211 | $img->Line($pos,$ys,$a2,$ys); |
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212 | } |
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213 | } |
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214 | |
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215 | $this->maj_ticks_pos[$i]=$ys; |
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216 | $this->maj_ticklabels_pos[$i]=$ys; |
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217 | |
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218 | if( $this->label_formfunc != '' ) { |
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219 | $f = $this->label_formfunc; |
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220 | $this->maj_ticks_label[$i]=call_user_func($f,$nextMajor); |
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221 | } |
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222 | elseif( $this->label_logtype == 0 ) { |
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223 | $this->maj_ticks_label[$i]=$nextMajor; |
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224 | } |
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225 | else { |
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226 | $this->maj_ticks_label[$i]='10^'.round(log10($nextMajor)); |
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227 | } |
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228 | ++$i; |
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229 | $nextMajor *= 10; |
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230 | $step *= 10; |
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231 | $count=1; |
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232 | } |
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233 | else { |
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234 | if( !$this->supress_tickmarks && !$this->supress_minor_tickmarks) { |
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235 | if( $this->mincolor!="" ) { |
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236 | $img->PushColor($this->mincolor); |
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237 | } |
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238 | $img->Line($pos,$ys,$a,$ys); |
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239 | if( $this->mincolor!="" ) { |
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240 | $img->PopColor(); |
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241 | } |
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242 | } |
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243 | } |
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244 | } |
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245 | } |
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246 | else { |
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247 | $a=$pos - $this->direction*$this->GetMinTickAbsSize(); |
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248 | $a2=$pos - $this->direction*$this->GetMajTickAbsSize(); |
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249 | $count=1; |
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250 | $this->maj_ticks_pos[0]=$scale->Translate($start); |
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251 | $this->maj_ticklabels_pos[0]=$scale->Translate($start); |
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252 | if( $this->supress_first ) { |
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253 | $this->maj_ticks_label[0]=""; |
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254 | } |
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255 | else { |
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256 | if( $this->label_formfunc != '' ) { |
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257 | $f = $this->label_formfunc; |
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258 | $this->maj_ticks_label[0]=call_user_func($f,$start); |
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259 | } |
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260 | elseif( $this->label_logtype == 0 ) { |
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261 | $this->maj_ticks_label[0]=$start; |
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262 | } |
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263 | else { |
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264 | $this->maj_ticks_label[0]='10^'.round(log10($start)); |
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265 | } |
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266 | } |
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267 | $i=1; |
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268 | for($x=$start; $x<=$limit; $x+=$step,++$count ) { |
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269 | $xs=$scale->Translate($x); |
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270 | $this->ticks_pos[]=$xs; |
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271 | $this->ticklabels_pos[]=$xs; |
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272 | if( $count % 10 == 0 ) { |
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273 | if( !$this->supress_tickmarks ) { |
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274 | $img->Line($xs,$pos,$xs,$a2); |
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275 | } |
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276 | $this->maj_ticks_pos[$i]=$xs; |
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277 | $this->maj_ticklabels_pos[$i]=$xs; |
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278 | |
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279 | if( $this->label_formfunc != '' ) { |
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280 | $f = $this->label_formfunc; |
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281 | $this->maj_ticks_label[$i]=call_user_func($f,$nextMajor); |
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282 | } |
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283 | elseif( $this->label_logtype == 0 ) { |
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284 | $this->maj_ticks_label[$i]=$nextMajor; |
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285 | } |
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286 | else { |
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287 | $this->maj_ticks_label[$i]='10^'.round(log10($nextMajor)); |
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288 | } |
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289 | ++$i; |
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290 | $nextMajor *= 10; |
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291 | $step *= 10; |
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292 | $count=1; |
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293 | } |
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294 | else { |
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295 | if( !$this->supress_tickmarks && !$this->supress_minor_tickmarks) { |
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296 | $img->Line($xs,$pos,$xs,$a); |
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297 | } |
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298 | } |
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299 | } |
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300 | } |
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301 | return true; |
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302 | } |
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303 | } // Class |
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304 | /* EOF */ |
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305 | ?> |
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