php下实现折线图效果的代码

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);  
//柱形长度  
$leight=($this->X-$this->BORDER*2)*($item_array[$i]/$item_max);  
ImageFilledRectangle($this->IMAGE,$this->BORDER,$yy-$this->BORDER,$leight,$yy,$color);  
ImageString($this->IMAGE,$this->FONTSIZE,$leight+2,$yy-$this->BORDER,$item_array[$i],$this->FONTCOLOR);  
//用于间隔  
$yy=$yy-$this->BORDER*2;  
}  
}  

//--------------折线图  
function imageLine(){  
$item_array=Split($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;  
//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  
$height_now=($this->Y-$this->BORDER)-($this->Y-$this->BORDER*2)*($item_array[$i]/$item_max);  
if($i!="0"){  
ImageLine($this->IMAGE,$xx,$height_next,$xx+$this->BORDER,$height_now,$color);  
}  
ImageString($this->IMAGE,$this->FONTSIZE,$xx+$this->BORDER,$height_now-$this->BORDER/2,$item_array[$i],$this->FONTCOLOR);  
$height_next=$height_now;  
//用于间隔  
$xx=$xx+$this->BORDER;  
}  
}  

//--------------完成打印图形http://knowsky.com  
function printAll(){  
ImageGIF($this->IMAGE);  
ImageDestroy($this->IMAGE);  
}  
//--------------调试  
function debug(){  
echo "X:".$this->X."
Y:".$this->Y;  
echo "
BORDER:".$this->BORDER;  
$item_array=split($this->ARRAYSPLIT,$this->ITEMARRAY);  
$num=Count($item_array);  
echo "
数值个数:".$num."