php做图利器，jpgraph 乱码问题解决

右上角说明，x轴，标题，中文乱码解决方法
jpgraph/jpgraph.php
   3491 class AxisPrototype {
   ...
   3496     //public $font_family=FF_FONT1,$font_style=FS_NORMAL,$font_size=12,$label_angle=0;
   3497     public $font_family=FF_SIMSUN,$font_style=FS_NORMAL,$font_size=8,$label_angle=0;

   5030 class DisplayValue {
   ...
   5035     //private $ff=FF_FONT1,$fs=FS_NORMAL,$fsize=10;
   5036     private $ff=FF_SIMSUN,$fs=FS_NORMAL,$fsize=8;

jpgraph/jpgraph_legend.inc.php
     22 class Legend {
     23     public $txtcol=array();
     24     //public $font_family=FF_FONT1,$font_style=FS_NORMAL,$font_size=12;
     25     public $font_family=FF_SIMSUN,$font_style=FS_NORMAL,$font_size=10;