Minor cleanup.

git-svn-id: svn://svn.zabbix.com/trunk@2378 97f52cf1-0a1b-0410-bd0e-c28be96e8082

2 files changed, 744 insertions, 0 deletions

diff --git a/frontends/php/include/classes/.htaccess b/frontends/php/include/classes/.htaccess
new file mode 100644
index 00000000..53c662c2
--- /dev/null
+++ b/frontends/php/include/classes/.htaccess
@@ -0,0 +1,7 @@
+Order Deny,Allow
+Deny from All
+
+<files *.php>
+Order Deny,Allow
+Deny from All
+</files>
diff --git a/frontends/php/include/classes/graph.inc.php b/frontends/php/include/classes/graph.inc.php
new file mode 100644
index 00000000..e13404b6
--- /dev/null
+++ b/frontends/php/include/classes/graph.inc.php
@@ -0,0 +1,737 @@
+<?php 
+/* 
+** ZABBIX
+** Copyright (C) 2000-2005 SIA Zabbix
+**
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation; either version 2 of the License, or
+** (at your option) any later version.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License
+** along with this program; if not, write to the Free Software
+** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+**/
+?>
+<?php
+	class	Graph
+	{
+		var $period;
+		var $from;
+		var $stime;
+		var $sizeX;
+		var $sizeY;
+		var $shiftX;
+		var $shiftY;
+		var $border;
+
+		var $yaxistype;
+		var $yaxismin;
+		var $yaxismax;
+		var $yaxisleft;
+		var $yaxisright;
+
+		// items[num].data.min[max|avg]
+		var $items;
+		// $idnum[$num] is itemid
+		var $itemids;
+		var $min;
+		var $max;
+		var $avg;
+		var $clock;
+		var $count;
+		// Number of items
+		var $num;
+
+		var $header;
+
+		var $from_time;
+		var $to_time;
+
+		var $colors;
+		var $im;
+
+		function initColors()
+		{
+// I should rename No Alpha to Alpha at some point to get rid of some confusion
+			if(function_exists("ImageColorExactAlpha")&&function_exists("ImageCreateTrueColor")&&@imagecreatetruecolor(1,1))
+			{
+				$this->colors["Red"]=		ImageColorExactAlpha($this->im,255,0,0,50); 
+				$this->colors["Dark Red"]=	ImageColorExactAlpha($this->im,150,0,0,50); 
+				$this->colors["Green"]=		ImageColorExactAlpha($this->im,0,255,0,50); 
+				$this->colors["Dark Green"]=	ImageColorExactAlpha($this->im,0,150,0,50); 
+				$this->colors["Blue"]=		ImageColorExactAlpha($this->im,0,0,255,50); 
+				$this->colors["Dark Blue"]=	ImageColorExactAlpha($this->im,0,0,150,50); 
+				$this->colors["Yellow"]=	ImageColorExactAlpha($this->im,255,255,0,50); 
+				$this->colors["Dark Yellow"]=	ImageColorExactAlpha($this->im,150,150,0,50); 
+				$this->colors["Cyan"]=		ImageColorExactAlpha($this->im,0,255,255,50); 
+				$this->colors["Black"]=		ImageColorExactAlpha($this->im,0,0,0,50); 
+				$this->colors["Gray"]=		ImageColorExactAlpha($this->im,150,150,150,50);
+
+				$this->colors["White"]=			ImageColorAllocate($this->im,255,255,255);
+				$this->colors["Dark Red No Alpha"]=	ImageColorAllocate($this->im,150,0,0); 
+				$this->colors["Black No Alpha"]=	ImageColorAllocate($this->im,0,0,0); 
+			}
+			else
+			{
+				$this->colors["Red"]=ImageColorAllocate($this->im,255,0,0); 
+				$this->colors["Dark Red"]=ImageColorAllocate($this->im,150,0,0); 
+				$this->colors["Green"]=ImageColorAllocate($this->im,0,255,0); 
+				$this->colors["Dark Green"]=ImageColorAllocate($this->im,0,150,0); 
+				$this->colors["Blue"]=ImageColorAllocate($this->im,0,0,255); 
+				$this->colors["Dark Blue"]=ImageColorAllocate($this->im,0,0,150); 
+				$this->colors["Yellow"]=ImageColorAllocate($this->im,255,255,0); 
+				$this->colors["Dark Yellow"]=ImageColorAllocate($this->im,150,150,0); 
+				$this->colors["Cyan"]=ImageColorAllocate($this->im,0,255,255); 
+				$this->colors["Black"]=ImageColorAllocate($this->im,0,0,0); 
+				$this->colors["Gray"]=ImageColorAllocate($this->im,150,150,150); 
+				$this->colors["White"]=ImageColorAllocate($this->im,255,255,255);
+
+				$this->colors["Dark Red No Alpha"]=	ImageColorAllocate($this->im,150,0,0); 
+				$this->colors["Black No Alpha"]=	ImageColorAllocate($this->im,0,0,0); 
+			}
+		}
+
+		function Graph()
+		{
+			$this->period=3600;
+			$this->from=0;
+			$this->sizeX=900;
+			$this->sizeY=200;
+			$this->shiftX=10;
+			$this->shiftY=17;
+			$this->border=1;
+			$this->num=0;
+			$this->yaxistype=GRAPH_YAXIS_TYPE_CALCULATED;
+			$this->yaxisright=0;
+			$this->yaxisleft=0;
+
+			$this->count=array();
+			$this->min=array();
+			$this->max=array();
+			$this->avg=array();
+			$this->clock=array();
+
+			$this->itemids=array();
+
+
+/*			if($this->period<=3600)
+			{
+				$this->date_format="H:i";
+			}
+			else
+			{
+				$this->date_format="m.d H:i";
+			}*/
+
+		}
+
+		function addItem($itemid)
+		{
+			$this->items[$this->num]=get_item_by_itemid($itemid);
+			$this->items[$this->num]["description"]=item_description($this->items[$this->num]["description"],$this->items[$this->num]["key_"]);
+			$host=get_host_by_hostid($this->items[$this->num]["hostid"]);
+			$this->items[$this->num]["host"]=$host["host"];
+			$this->itemids[$this->items[$this->num]["itemid"]]=$this->num;
+			$this->items[$this->num]["color"]="Dark Green";
+			$this->items[$this->num]["drawtype"]=GRAPH_DRAW_TYPE_LINE;
+			$this->items[$this->num]["axisside"]=GRAPH_YAXIS_SIDE_RIGHT;
+			$this->yaxisright=1;
+			$this->num++;
+		}
+
+		function SetColor($itemid,$color)
+		{
+			$this->items[$this->itemids[$itemid]]["color"]=$color;
+		}
+
+		function setDrawtype($itemid,$drawtype)
+		{
+			$this->items[$this->itemids[$itemid]]["drawtype"]=$drawtype;
+		}
+
+		function setYAxisSide($itemid,$axisside)
+		{
+			$this->items[$this->itemids[$itemid]]["axisside"]=$axisside;
+			if($axisside == GRAPH_YAXIS_SIDE_LEFT)
+			{
+				$this->yaxisleft=1;
+			}
+			else
+			{
+				$this->yaxisright=1;
+			}
+		}
+
+		function setPeriod($period)
+		{
+			$this->period=$period;
+		}
+
+		function setYAxisMin($yaxismin)
+		{
+			$this->yaxismin=$yaxismin;
+		}
+
+		function setYAxisMax($yaxismax)
+		{
+			$this->yaxismax=$yaxismax;
+		}
+
+		function setYAxisType($yaxistype)
+		{
+			$this->yaxistype=$yaxistype;
+		}
+
+		function setSTime($stime)
+		{
+			if($stime>200000000000 && $stime<220000000000)
+			{
+				$this->stime=mktime(substr($stime,8,2),substr($stime,10,2),0,substr($stime,4,2),substr($stime,6,2),substr($stime,0,4));
+			}
+		}
+
+		function setFrom($from)
+		{
+			$this->from=$from;
+		}
+
+		function setWidth($width)
+		{
+// Avoid sizeX==0, to prevent division by zero later
+			if($width>0)
+			{
+				$this->sizeX=$width;
+			}
+		}
+
+		function setHeight($height)
+		{
+			$this->sizeY=$height;
+		}
+
+		function setBorder($border)
+		{
+			$this->border=$border;
+		}
+
+		function getLastValue($num)
+		{
+			for($i=899;$i>=0;$i--)
+			{
+				if(isset($this->count[$num][$i])&&($this->count[$num][$i]>0))
+				{
+					return $this->avg[$num][$i];
+				}
+			}
+		}
+
+		function drawSmallRectangle()
+		{
+			DashedLine($this->im,$this->shiftX+1,$this->shiftY,$this->shiftX+1,$this->sizeY+$this->shiftY,$this->colors["Black No Alpha"]);
+			DashedLine($this->im,$this->shiftX+1,$this->shiftY,$this->shiftX+$this->sizeX,$this->shiftY,$this->colors["Black No Alpha"]);
+			DashedLine($this->im,$this->shiftX+$this->sizeX,$this->shiftY,$this->shiftX+$this->sizeX,$this->sizeY+$this->shiftY,$this->colors["Black No Alpha"]);
+			DashedLine($this->im,$this->shiftX+1,$this->shiftY+$this->sizeY,$this->shiftX+$this->sizeX,$this->sizeY+$this->shiftY,$this->colors["Black No Alpha"]);
+		}
+
+		function drawRectangle()
+		{
+			ImageFilledRectangle($this->im,0,0,$this->sizeX+$this->shiftX+61,$this->sizeY+$this->shiftY+62+12*$this->num+8,$this->colors["White"]);
+			if($this->border==1)
+			{
+				ImageRectangle($this->im,0,0,imagesx($this->im)-1,imagesy($this->im)-1,$this->colors["Black No Alpha"]);
+			}
+		}
+
+		function period2str($period)
+		{
+			$minute=60; $hour=$minute*60; $day=$hour*24;
+			$str = " ( ";
+
+			$days=floor($this->period/$day);
+			$hours=floor(($this->period%$day)/$hour);
+			$minutes=floor((($this->period%$day)%$hour)/$minute);
+			$str.=($days>0 ? $days."d" : "").($hours>0 ?  $hours."h" : "").($minutes>0 ? $minutes."m" : "");
+			$str.=" history ";
+
+			$hour=1; $day=$hour*24;
+			$days=floor($this->from/$day);
+			$hours=floor(($this->from%$day)/$hour);
+			$minutes=floor((($this->from%$day)%$hour)/$minute);
+			$str.=($days>0 ? $days."d" : "").($hours>0 ?  $hours."h" : "").($minutes>0 ? $minutes."m" : "");
+			$str.=($days+$hours+$minutes>0 ? " in past " : "");
+
+			$str.=")";
+
+			return $str;
+		}
+
+		function drawHeader()
+		{
+			if(!isset($this->header))
+			{
+				$str=$this->items[0]["host"].":".$this->items[0]["description"];
+			}
+			else
+			{
+				$str=$this->header;
+			}
+
+			$str=$str.$this->period2str($this->period);
+
+			if($this->sizeX < 300)
+			{
+				$fontnum = 2;
+			}
+			else
+			{
+				$fontnum = 4;
+			}
+			$x=imagesx($this->im)/2-ImageFontWidth($fontnum)*strlen($str)/2;
+			ImageString($this->im, $fontnum,$x,1, $str , $this->colors["Dark Red No Alpha"]);
+		}
+
+		function setHeader($header)
+		{
+			$this->header=$header;
+		}
+
+		function drawGrid()
+		{
+			$this->drawSmallRectangle();
+			for($i=1;$i<=5;$i++)
+			{
+				DashedLine($this->im,$this->shiftX,$i*$this->sizeY/6+$this->shiftY,$this->sizeX+$this->shiftX,$i*$this->sizeY/6+$this->shiftY,$this->colors["Gray"]);
+			}
+		
+			for($i=1;$i<=23;$i++)
+			{
+				DashedLine($this->im,$i*$this->sizeX/24+$this->shiftX,$this->shiftY,$i*$this->sizeX/24+$this->shiftX,$this->sizeY+$this->shiftY,$this->colors["Gray"]);
+			}
+
+			$old_day=-1;
+			for($i=0;$i<=24;$i++)
+			{
+				ImageStringUp($this->im, 1,$i*$this->sizeX/24+$this->shiftX-3, $this->sizeY+$this->shiftY+57, date("      H:i",$this->from_time+$i*$this->period/24) , $this->colors["Black No Alpha"]);
+
+				$new_day=date("d",$this->from_time+$i*$this->period/24);
+				if( ($old_day != $new_day) ||($i==24))
+				{
+					$old_day=$new_day;
+					ImageStringUp($this->im, 1,$i*$this->sizeX/24+$this->shiftX-3, $this->sizeY+$this->shiftY+57, date("m.d H:i",$this->from_time+$i*$this->period/24) , $this->colors["Dark Red No Alpha"]);
+
+				}
+			}
+		}
+
+		function checkPermissions()
+		{
+			if(!check_right("Item","R",$this->items[0]["itemid"]))
+			{
+				$this->drawGrid();
+				ImageString($this->im, 2,$this->sizeX/2 -50,$this->sizeY+$this->shiftY+3, "NO PERMISSIONS" , $this->colors["Dark Red No Alpha"]);
+				ImageOut($this->im); 
+				ImageDestroy($this->im); 
+				exit;
+			}
+		}
+
+		function drawLogo()
+		{
+			ImageStringUp($this->im,0,imagesx($this->im)-10,imagesy($this->im)-50, "http://www.zabbix.com", $this->colors["Gray"]);
+		}
+
+		function drawLegend()
+		{
+			$max_host_len=0;
+			$max_desc_len=0;
+			for($i=0;$i<$this->num;$i++)
+			{
+				if(strlen($this->items[$i]["host"])>$max_host_len)	$max_host_len=strlen($this->items[$i]["host"]);
+				if(strlen($this->items[$i]["description"])>$max_desc_len)	$max_desc_len=strlen($this->items[$i]["description"]);
+			}
+
+			for($i=0;$i<$this->num;$i++)
+			{
+				ImageFilledRectangle($this->im,$this->shiftX,$this->sizeY+$this->shiftY+62+12*$i,$this->shiftX+5,$this->sizeY+$this->shiftY+5+62+12*$i,$this->colors[$this->items[$i]["color"]]);
+				ImageRectangle($this->im,$this->shiftX,$this->sizeY+$this->shiftY+62+12*$i,$this->shiftX+5,$this->sizeY+$this->shiftY+5+62+12*$i,$this->colors["Black No Alpha"]);
+
+				if(isset($this->min[$i]))
+				{
+					$str=sprintf("%s: %s [min:%s max:%s last:%s]",
+						str_pad($this->items[$i]["host"],$max_host_len," "),
+						str_pad($this->items[$i]["description"],$max_desc_len," "),
+						convert_units(min($this->min[$i]),$this->items[$i]["units"]),
+						convert_units(max($this->max[$i]),$this->items[$i]["units"]),
+						convert_units($this->getLastValue($i),$this->items[$i]["units"]));
+				}
+				else
+				{
+					$str=sprintf("%s: %s [ no data ]",
+						str_pad($this->items[$i]["host"],$max_host_len," "),
+						str_pad($this->items[$i]["description"],$max_desc_len," "));
+				}
+	
+				ImageString($this->im, 2,$this->shiftX+9,$this->sizeY+$this->shiftY+(62-5)+12*$i,$str, $this->colors["Black No Alpha"]);
+			}
+		}
+
+		function drawElement($item,$x1,$y1,$x2,$y2)
+		{
+			if($this->items[$item]["drawtype"] == GRAPH_DRAW_TYPE_LINE)
+			{
+				ImageLine($this->im,$x1,$y1,$x2,$y2,$this->colors[$this->items[$item]["color"]]);
+			}
+			else if($this->items[$item]["drawtype"] == GRAPH_DRAW_TYPE_BOLDLINE)
+			{
+				ImageLine($this->im,$x1,$y1,$x2,$y2,$this->colors[$this->items[$item]["color"]]);
+				ImageLine($this->im,$x1,$y1+1,$x2,$y2+1,$this->colors[$this->items[$item]["color"]]);
+			}
+			else if($this->items[$item]["drawtype"] == GRAPH_DRAW_TYPE_FILL)
+			{
+				$a[0]=$x1;
+				$a[1]=$y1;
+				$a[2]=$x1;
+				$a[3]=$this->shiftY+$this->sizeY;
+				$a[4]=$x2;
+				$a[5]=$this->shiftY+$this->sizeY;
+				$a[6]=$x2;
+				$a[7]=$y2;
+
+				ImageFilledPolygon($this->im,$a,4,$this->colors[$this->items[$item]["color"]]);
+			}
+			else if($this->items[$item]["drawtype"] == GRAPH_DRAW_TYPE_DOT)
+			{
+				ImageFilledRectangle($this->im,$x1-1,$y1-1,$x1+1,$y1+1,$this->colors[$this->items[$item]["color"]]);
+				ImageFilledRectangle($this->im,$x2-1,$y2-1,$x2+1,$y2+1,$this->colors[$this->items[$item]["color"]]);
+			}
+		}
+
+// Calculation of maximum Y left axis side
+		function calculateMinYleft()
+		{
+			if($this->yaxistype==GRAPH_YAXIS_TYPE_FIXED)
+			{
+				return $this->yaxismin;
+			}
+			else
+			{
+				return 0;
+			}
+		}
+
+// Calculation of maximum Y right axis side
+		function calculateMinYright()
+		{
+			if($this->yaxistype==GRAPH_YAXIS_TYPE_FIXED)
+			{
+				return $this->yaxismin;
+			}
+			else
+			{
+				return 0;
+			}
+		}
+
+// Calculation of maximum Y right side
+		function calculateMaxYright()
+		{
+			if($this->yaxistype==GRAPH_YAXIS_TYPE_FIXED)
+			{
+				return $this->yaxismax;
+			}
+			else
+			{
+				unset($maxY);
+				for($i=0;$i<$this->num;$i++)
+				{
+					if($this->items[$i]["axisside"] != GRAPH_YAXIS_SIDE_RIGHT)	continue;
+					if(!isset($maxY)&&(isset($this->max[$i])))
+					{
+						if(count($this->max[$i])>0)
+						{
+							$maxY=max($this->max[$i]);
+						}
+					}
+					else
+					{
+						$maxY=@iif($maxY<max($this->max[$i]),max($this->max[$i]),$maxY);
+					}
+				}
+	
+				if(isset($maxY)&&($maxY>0))
+				{
+					$exp = floor(log10($maxY));
+					$mant = $maxY/pow(10,$exp);
+				}
+				else
+				{
+					$exp=0;
+					$mant=0;
+				}
+	
+				$mant=(floor($mant*1.1*10/6)+1)*6/10;
+	
+				$maxY = $mant*pow(10,$exp);
+	
+				return $maxY;
+			}
+		}
+
+// Calculation of maximum Y left side
+		function calculateMaxYleft()
+		{
+			if($this->yaxistype==GRAPH_YAXIS_TYPE_FIXED)
+			{
+				return $this->yaxismax;
+			}
+			else
+			{
+				unset($maxY);
+				for($i=0;$i<$this->num;$i++)
+				{
+					if($this->items[$i]["axisside"] != GRAPH_YAXIS_SIDE_LEFT)	continue;
+					if(!isset($maxY)&&(isset($this->max[$i])))
+					{
+						if(count($this->max[$i])>0)
+						{
+							$maxY=max($this->max[$i]);
+						}
+					}
+					else
+					{
+						$maxY=@iif($maxY<max($this->max[$i]),max($this->max[$i]),$maxY);
+					}
+				}
+	
+				if(isset($maxY)&&($maxY>0))
+				{
+					$exp = floor(log10($maxY));
+					$mant = $maxY/pow(10,$exp);
+				}
+				else
+				{
+					$exp=0;
+					$mant=0;
+				}
+	
+				$mant=(floor($mant*1.1*10/6)+1)*6/10;
+	
+				$maxY = $mant*pow(10,$exp);
+	
+				return $maxY;
+			}
+		}
+
+		function selectData()
+		{
+			$now = time(NULL);
+			if(isset($this->stime))
+			{
+#				$this->to_time=$this->stime+24*3600;
+#				$this->from_time=$this->stime;
+				$this->from_time=$this->stime;
+				$this->to_time=$this->stime+$this->period;
+			}
+			else
+			{
+				$this->to_time=$now-3600*$this->from;
+				$this->from_time=$this->to_time-$this->period;
+			}
+		
+			$p=$this->to_time-$this->from_time;
+			$z=$p-$this->from_time%$p;
+
+			$str=" ";
+			for($i=0;$i<$this->num;$i++)
+			{
+				$str=$str.$this->items[$i]["itemid"].",";
+			}
+			$str=substr($str,0,strlen($str)-1);
+			if($str=="")	$str=-1;
+
+			if($this->period<=24*3600)
+			{
+				$sql="select itemid,round(900*((clock+$z)%($p))/($p),0) as i,count(*) as count,avg(value) as avg,min(value) as min,max(value) as max,max(clock) as clock from history where itemid in ($str) and clock>=".$this->from_time." and clock<=".$this->to_time." group by itemid,round(900*((clock+$z)%($p))/($p),0)";
+			}
+			else
+			{
+				$sql="select itemid,round(900*((clock+$z)%($p))/($p),0) as i,sum(num) as count,avg(value_avg) as avg,min(value_min) as min,max(value_max) as max,max(clock) as clock from trends where itemid in ($str) and clock>=".$this->from_time." and clock<=".$this->to_time." group by itemid,round(900*((clock+$z)%($p))/($p),0)";
+			}
+//			echo $sql;
+
+			$result=DBselect($sql);
+			while($row=DBfetch($result))
+			{
+				$i=$row["i"];
+				$this->count[$this->itemids[$row["itemid"]]][$i]=$row["count"];
+				$this->min[$this->itemids[$row["itemid"]]][$i]=$row["min"];
+				$this->max[$this->itemids[$row["itemid"]]][$i]=$row["max"];
+				$this->avg[$this->itemids[$row["itemid"]]][$i]=$row["avg"];
+				$this->clock[$this->itemids[$row["itemid"]]][$i]=$row["clock"];
+			}
+		}
+
+		function Draw()
+		{
+			$start_time=getmicrotime();
+
+//			$this->im = imagecreate($this->sizeX+$this->shiftX+61,$this->sizeY+2*$this->shiftY+40);
+
+			Header( "Content-type:  text/html"); 
+#			Header( "Content-type:  image/png"); 
+			Header( "Expires:  Mon, 17 Aug 1998 12:51:50 GMT"); 
+
+			check_authorisation();
+		
+			if(function_exists("ImageColorExactAlpha")&&function_exists("ImageCreateTrueColor")&&@imagecreatetruecolor(1,1))
+			{
+				$this->im = ImageCreateTrueColor($this->sizeX+$this->shiftX+61,$this->sizeY+$this->shiftY+62+12*$this->num+8);
+			}
+			else
+			{
+				$this->im = imagecreate($this->sizeX+$this->shiftX+61,$this->sizeY+$this->shiftY+62+12*$this->num+8);
+			}
+
+			$this->initColors();
+			$this->drawRectangle();
+			$this->drawHeader();
+
+			if($this->num==0)
+			{
+//				$this->noDataFound();
+			}
+
+			$this->checkPermissions();
+
+			$this->selectData();
+
+			$this->drawGrid();
+		
+			$maxX=900;
+			$minX=0;
+
+			$minYleft=$this->calculateMinYleft();
+			$minYright=$this->calculateMinYright();
+			$maxYleft=$this->calculateMaxYleft();
+			$maxYright=$this->calculateMaxYright();
+
+			// For each metric
+			for($item=0;$item<$this->num;$item++)
+			{
+				if($this->items[$item]["axisside"] == GRAPH_YAXIS_SIDE_RIGHT)
+				{
+					$minY=$minYright;
+					$maxY=$maxYright;
+				}
+				else
+				{
+					$minY=$minYleft;
+					$maxY=$maxYleft;
+				}
+
+				// For each X
+				for($i=0;$i<900;$i++)
+				{
+					if(isset($this->count[$item][$i])&&($this->count[$item][$i]>0))
+					{
+						for($j=$i-1;$j>=0;$j--)
+						{
+							if(isset($this->count[$item][$j])&&($this->count[$item][$j]>0))
+							{
+								$x1=$this->sizeX*($i-$minX)/($maxX-$minX);
+								$y1=$this->sizeY*($this->avg[$item][$i]-$minY)/($maxY-$minY);
+								$y1=$this->sizeY-$y1;
+
+								$x2=$this->sizeX*($j-$minX)/($maxX-$minX);
+								$y2=$this->sizeY*($this->avg[$item][$j]-$minY)/($maxY-$minY);
+								$y2=$this->sizeY-$y2;
+
+								// Do not draw anything if difference between two points is more than 4*(item refresh period)
+//								if($this->clock[$item][$i]-$this->clock[$item][$j]<4*$this->items[$item]["delay"])
+//								echo 8*($this->to_time-$this->from_time)/900,"<br>";
+//								echo $this->clock[$item][$i]-$this->clock[$item][$j],"<br>";
+								$diff=$this->clock[$item][$i]-$this->clock[$item][$j];
+								$cell=($this->to_time-$this->from_time)/900;
+								$delay=$this->items[$item]["delay"];
+								if($cell>$delay)
+								{
+									if($diff<16*$cell)
+										$this->drawElement($item, $x1+$this->shiftX,$y1+$this->shiftY,$x2+$this->shiftX+1,$y2+$this->shiftY);
+								}
+								else
+								{
+									if($diff<4*$delay)
+										$this->drawElement($item, $x1+$this->shiftX,$y1+$this->shiftY,$x2+$this->shiftX+1,$y2+$this->shiftY);
+								}
+								break;
+							}
+						}
+					}
+				}
+			}
+	
+			if($this->yaxisright == 1)	
+				for($i=0;$i<=6;$i++)
+				{
+					ImageString($this->im, 1, $this->sizeX+5+$this->shiftX, $this->sizeY-$this->sizeY*$i/6-4+$this->shiftY, convert_units($this->sizeY*$i/6*($maxYright-$minYright)/$this->sizeY+$minYright,$this->items[0]["units"]) , $this->colors["Dark Red No Alpha"]);
+				}
+
+			if($this->yaxisleft == 1)	
+				for($i=0;$i<=6;$i++)
+				{
+					ImageString($this->im, 1, 5, $this->sizeY-$this->sizeY*$i/6-4+$this->shiftY, convert_units($this->sizeY*$i/6*($maxYleft-$minYleft)/$this->sizeY+$minYleft,$this->items[0]["units"]) , $this->colors["Dark Red No Alpha"]);
+				}
+
+			$this->drawLogo();
+
+			$this->drawLegend();
+		
+			$end_time=getmicrotime();
+			$str=sprintf("%0.2f",($end_time-$start_time));
+			ImageString($this->im, 0,imagesx($this->im)-120,imagesy($this->im)-12,"Generated in $str sec", $this->colors["Gray"]);
+
+			ImageOut($this->im); 
+			ImageDestroy($this->im); 
+		}
+	}
+
+	class	Item
+	{
+		var $data;
+		
+		function	Item($itemid=0)
+		{
+			if($itemid!=0)
+			{
+				$i=get_item_by_itemid($itemid);
+				if($i)
+				{
+					$data=$i;
+				}
+				else	unset($data);
+			}	
+		}
+		
+		function	GetData($element)
+		{
+			if(isset($this->data))
+			{
+				return $this->data[$element];
+			}
+			else
+			{
+				return false;
+			}
+		}
+
+		function	SetData($element)
+		{
+		}
+	}
+?>