[Sommaire] [Imprimer]

   1  <?php
   2  /*=======================================================================
   3  // File:     JPGRAPH_ERROR.PHP
   4  // Description:    Error plot extension for JpGraph
   5  // Created:     2001-01-08
   6  // Author:    Johan Persson (johanp@aditus.nu)
   7  // Ver:        $Id: jpgraph_error.php 18250 2005-05-07 14:13:43Z ralfbecker $
   8  //
   9  // License:    This code is released under GPL 2.0
  10  // Copyright (C) 2001 Johan Persson
  11  //========================================================================
  12  */
  13  
  14  //===================================================
  15  // CLASS ErrorPlot
  16  // Description: Error plot with min/max value for
  17  // each datapoint
  18  //===================================================
  19  class ErrorPlot extends Plot {
  20      var $errwidth=2;
  21      var $center=false;
  22  //---------------
  23  // CONSTRUCTOR
  24      function ErrorPlot(&$datay,$datax=false) {
  25      $this->Plot($datay,$datax);
  26      $this->numpoints /= 2;
  27      }
  28  //---------------
  29  // PUBLIC METHODS
  30      function SetCenter($c=true) {
  31      $this->center=$c;
  32      }    
  33      
  34      // Gets called before any axis are stroked
  35      function PreStrokeAdjust(&$graph) {
  36      if( $this->center ) {
  37          $a=0.5; $b=0.5;
  38          ++$this->numpoints;            
  39      } else {
  40          $a=0; $b=0;
  41      }
  42      $graph->xaxis->scale->ticks->SetXLabelOffset($a);
  43      $graph->SetTextScaleOff($b);                        
  44      $graph->xaxis->scale->ticks->SupressMinorTickMarks();
  45      }
  46      
  47      // Method description
  48      function Stroke(&$img,&$xscale,&$yscale) {
  49      $numpoints=count($this->coords[0])/2;
  50      $img->SetColor($this->color);
  51      $img->SetLineWeight($this->weight);    
  52          
  53      for( $i=0; $i<$numpoints; ++$i) {
  54          $xt = $xscale->Translate($i);
  55          $yt1 = $yscale->Translate($this->coords[0][$i*2]);
  56          $yt2 = $yscale->Translate($this->coords[0][$i*2+1]);
  57          $img->Line($xt,$yt1,$xt,$yt2);
  58          $img->Line($xt-$this->errwidth,$yt1,$xt+$this->errwidth,$yt1);
  59          $img->Line($xt-$this->errwidth,$yt2,$xt+$this->errwidth,$yt2);
  60      }            
  61      return true;
  62      }
  63  } // Class
  64  
  65  
  66  //===================================================
  67  // CLASS ErrorLinePlot
  68  // Description: Combine a line and error plot
  69  //===================================================
  70  class ErrorLinePlot extends ErrorPlot {
  71      var $line=null;
  72  //---------------
  73  // CONSTRUCTOR
  74      function ErrorLinePlot(&$datay,$datax=false) {
  75      $this->ErrorPlot($datay);
  76      // Calculate line coordinates as the average of the error limits
  77      for($i=0; $i<count($datay); $i+=2 ) {
  78          $ly[]=($datay[$i]+$datay[$i+1])/2;
  79      }        
  80      $this->line=new LinePlot($ly);
  81      }
  82  
  83  //---------------
  84  // PUBLIC METHODS
  85      function Legend(&$graph) {
  86      if( $this->legend != "" )
  87          $graph->legend->Add($this->legend,$this->color);
  88      $this->line->Legend($graph);
  89      }
  90              
  91      function Stroke(&$img,&$xscale,&$yscale) {
  92      parent::Stroke($img,$xscale,$yscale);
  93      $this->line->Stroke($img,$xscale,$yscale);
  94      }
  95  } // Class
  96  
  97  /* EOF */
  98  ?>