php下实现折线图效果的代码

$xx=$this->X/10;  
$yy=$this->Y-$this->Y/10;  
ImageLine($this->IMAGE,$this->BORDER,$this->BORDER,$this->BORDER,$this->Y-$this->BORDER,$color);//X轴  
ImageLine($this->IMAGE,$this->BORDER,$this->Y-$this->BORDER,$this->X-$this->BORDER,$this->Y-$this->BORDER,$color);//y轴  
//Y轴上刻度  
$rulerY=$this->Y-$this->BORDER;  
while($rulerY>$this->BORDER*2){  
$rulerY=$rulerY-$this->BORDER;  
ImageLine($this->IMAGE,$this->BORDER,$rulerY,$this->BORDER-2,$rulerY,$color);  
}  
//X轴上刻度  
$rulerX=$rulerX+$this->BORDER;  
while($rulerX<($this->X-$this->BORDER*2)){  
$rulerX=$rulerX+$this->BORDER;  
//ImageLine($this->IMAGE,$this->BORDER,10,$this->BORDER+10,10,$color);  
ImageLine($this->IMAGE,$rulerX,$this->Y-$this->BORDER,$rulerX,$this->Y-$this->BORDER+2,$color);  
}  
}  

//--------------竖柱形图  
function imageColumnS(){  
$item_array=Split($this->ARRAYSPLIT,$this->ITEMARRAY);  
$num=Count($item_array);  
$item_max=0;  
for ($i=0;$i<$num;$i++){ 
$item_max=Max($item_max,$item_array[$i]); 
} 
$xx=$this->BORDER*2;  
//画柱形图  
for ($i=0;$i<$num;$i++){ 
srand((double)microtime()*1000000); 
if($this->R!=255 && $this->G!=255 && $this->B!=255){  
$R=Rand($this->R,200);  
$G=Rand($this->G,200);  
$B=Rand($this->B,200);  
}else{  
$R=Rand(50,200);  
$G=Rand(50,200);  
$B=Rand(50,200);  
}  
$color=ImageColorAllocate($this->IMAGE,$R,$G,$B);  
//柱形高度  
$height=($this->Y-$this->BORDER)-($this->Y-$this->BORDER*2)*($item_array[$i]/$item_max);  
ImageFilledRectangle($this->IMAGE,$xx,$height,$xx+$this->BORDER,$this->Y-$this->BORDER,$color);  
ImageString($this->IMAGE,$this->FONTSIZE,$xx,$height-$this->BORDER,$item_array[$i],$this->FONTCOLOR);  
//用于间隔  
$xx=$xx+$this->BORDER*2;  
}  
}  

//-----------横柱形图  
function imageColumnH(){  
$item_array=Split($this->ARRAYSPLIT,$this->ITEMARRAY);  
$num=Count($item_array);  
$item_max=0;  
for ($i=0;$i<$num;$i++){ 
$item_max=Max($item_max,$item_array[$i]); 
} 
$yy=$this->Y-$this->BORDER*2;  
//画柱形图  
for ($i=0;$i<$num;$i++){