php繪圖的x軸與y軸

請問我要把x軸改成顯示正負數
y軸改成數字出現的次數
要從下面哪邊改

還有如何增加兩條以上的曲線圖
謝謝~麻煩指導
<?php
Class ImageReport{
var $X;//圖片大小X軸
var $Y;//圖片大小Y軸
var $R;//背影色R值
var $G;//...G.
var $B;//...B.
var $TRANSPARENT;//是否透明1或0
var $IMAGE;//圖片對像
//-------------------
var $ARRAYSPLIT;//指定用于分隔數值的符號
var $ITEMARRAY;//數值
var $REPORTTYPE;//圖表類型,1為豎柱形2為橫柱形3為折線形
var $BORDER;//距離
//-------------------
var $FONTSIZE;//字體大小
var $FONTCOLOR;//字體顏色
//--------參數設置函數
function setImage($SizeX,$SizeY,$R,$G,$B,$Transparent){
$this->X=$SizeX;
$this->Y=$SizeY;
$this->R=$R;
$this->G=$G;
$this->B=$B;
$this->TRANSPARENT=$Transparent;
}
function setItem($ArraySplit,$ItemArray,$ReportType,$Border){
$this->ARRAYSPLIT=$ArraySplit;
$this->ITEMARRAY=$ItemArray;
$this->REPORTTYPE=$ReportType;
$this->BORDER=$Border;
}
function setFont($FontSize){
$this->FONTSIZE=$FontSize;
}
//----------------主體
function PrintReport(){
Header( "Content-type: image/gif");
//建立畫布大小
$this->IMAGE=ImageCreate($this->X,$this->Y);
//設定畫布背景色
$background=ImageColorAllocate($this->IMAGE,$this->R,$this->G,$this->B);
if($this->TRANSPARENT=="1"){
//背影透明
Imagecolortransparent($this->IMAGE,$background);
}else{
//如不要透明時可填充背景色
ImageFilledRectangle($this->IMAGE,0,0,$this->X,$this->Y,$background);
}
//參數字體文小及顏色
$this->FONTCOLOR=ImageColorAllocate($this->IMAGE,255-$this->R,255-$this->G,255-$this->B);
Switch ($this->REPORTTYPE){
case "0":
break;
case "1":
$this->imageColumnS();
break;
case "2":
$this->imageColumnH();
break;
case "3":
$this->imageLine();
break;
}
$this->printXY();
$this->printAll();
}
//-----------打印XY坐標軸
function printXY(){
//畫XY坐標軸*/
$color=ImageColorAllocate($this->IMAGE,255-$this->R,255-$this->G,255-$this->B);
$xx=$this->X/10;
$yy=$this->Y-$this->Y/10;
ImageLine($this->IMAGE,$this->BORDER,$this->BORDER,$this->BORDER,$this->Y-$this->BORDER,$color);//X軸
ImageLine($this->IMAGE,$this->BORDER,$this->Y-$this->BORDER,$this->X-$this->BORDER,$this->Y-$this->BORDER,$color);//y軸
//Y軸上刻度
$rulerY=$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軸上刻度
$rulerX=$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);
}
}
//--------------豎柱形圖
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;
//畫柱形圖
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);
//用于間隔
$xx=$xx+$this->BORDER*2;
}
}
//-----------橫柱形圖
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-$this->BORDER*2;
//畫柱形圖
for ($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);
//柱形長度
$leight=($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);
//用于間隔
$yy=$yy-$this->BORDER*2;
}
}
//--------------折線圖
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;
//畫柱形圖
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;
//用于間隔
$xx=$xx+$this->BORDER;
}
}
//--------------完成打印圖形
function printAll(){
ImageGIF($this->IMAGE);
ImageDestroy($this->IMAGE);
}
//--------------調試
function debug(){
echo "X:".$this->X."
Y:".$this->Y;
echo "
BORDER:".$this->BORDER;
$item_array=split($this->ARRAYSPLIT,$this->ITEMARRAY);
$num=Count($item_array);
echo "
數值個數:".$num."
數值:";
for ($i=0;$i<$num;$i++){
echo "
".$item_array[$i];
}
}
}
$report=new ImageReport;
$report->setImage(600,500,255,255,255,1);//參數(長,寬,背影色R,G,B,是否透明1或0)
$temparray="50,25,100,250,180,200,150,220,-200,150,50,25,100,250,-180,200,150,-220,200,-150";//數值,用指定符號隔開
$report->setItem(',',$temparray,3,30);//參數(分隔數值的指定符號,數值變量,樣式1為豎柱圖2為橫柱圖3為折線圖,距離)
$report->setFont(3);//字體大小1-10
$report->PrintReport();
//$report->debug();//調式之用
?>

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