<?php
/*=======================================================================
// File:	JPGRAPH_DATE.PHP
// Description:	Classes to handle Date scaling
// Created: 	2005-05-02
// Author:	Johan Persson (johanp@aditus.nu)
// Ver:		$Id: jpgraph_date.php,v 1.1 2006/07/07 13:37:14 powles Exp $
//
// Copyright (c) Aditus Consulting. All rights reserved.
//========================================================================
*/

DEFINE('HOURADJ_1',0+30);
DEFINE('HOURADJ_2',1+30);
DEFINE('HOURADJ_3',2+30);
DEFINE('HOURADJ_4',3+30);
DEFINE('HOURADJ_6',4+30);
DEFINE('HOURADJ_12',5+30);

DEFINE('MINADJ_1',0+20);
DEFINE('MINADJ_5',1+20);
DEFINE('MINADJ_10',2+20);
DEFINE('MINADJ_15',3+20);
DEFINE('MINADJ_30',4+20);

DEFINE('SECADJ_1',0);
DEFINE('SECADJ_5',1);
DEFINE('SECADJ_10',2);
DEFINE('SECADJ_15',3);
DEFINE('SECADJ_30',4);


DEFINE('YEARADJ_1',0+30);
DEFINE('YEARADJ_2',1+30);
DEFINE('YEARADJ_5',2+30);

DEFINE('MONTHADJ_1',0+20);
DEFINE('MONTHADJ_6',1+20);

DEFINE('DAYADJ_1',0);
DEFINE('DAYADJ_WEEK',1);
DEFINE('DAYADJ_7',1);

DEFINE('SECPERYEAR',31536000);
DEFINE('SECPERDAY',86400);
DEFINE('SECPERHOUR',3600);
DEFINE('SECPERMIN',60);


class DateScale extends LinearScale {
    var $date_format = '';
    var $iStartAlign = false, $iEndAlign = false;
    var $iStartTimeAlign = false, $iEndTimeAlign = false;

//---------------
// CONSTRUCTOR
    function DateScale($aMin=0,$aMax=0,$aType='x') {
	assert($aType=="x");
	assert($aMin<=$aMax);
		
	$this->type=$aType;
	$this->scale=array($aMin,$aMax);		
	$this->world_size=$aMax-$aMin;	
	$this->ticks = new LinearTicks();
	$this->intscale=true;
    }


//------------------------------------------------------------------------------------------
// Utility Function AdjDate()
// Description: Will round a given time stamp to an even year, month or day 
// argument. 
//------------------------------------------------------------------------------------------

    function AdjDate($aTime,$aRound=0,$aYearType=false,$aMonthType=false,$aDayType=false) {
	$y = (int)date('Y',$aTime); $m = (int)date('m',$aTime); $d = (int)date('d',$aTime);
	$h=0;$i=0;$s=0;
	if( $aYearType !== false ) {
	    $yearAdj = array(0=>1, 1=>2, 2=>5);
	    if( $aRound == 0 ) {
		$y = floor($y/$yearAdj[$aYearType])*$yearAdj[$aYearType];
	    }
	    else {
		++$y;
		$y = ceil($y/$yearAdj[$aYearType])*$yearAdj[$aYearType];
	    }
	    $m=1;$d=1;
	}
	elseif( $aMonthType !== false ) {
	    $monthAdj = array(0=>1, 1=>6);
	    if( $aRound == 0 ) {
		$m = floor($m/$monthAdj[$aMonthType])*$monthAdj[$aMonthType];
		$d=1;
	    }
	    else {
		++$m;
		$m = ceil($m/$monthAdj[$aMonthType])*$monthAdj[$aMonthType];
		$d=1;
	    }
	}
	elseif( $aDayType !== false ) {
	    if( $aDayType == 0 ) {
		if( $aRound == 1 ) {
		    //++$d;
		    $h=23;$i=59;$s=59;
		}
	    }
	    else {
		// Adjust to an even week boundary. 
		$w = (int)date('w',$aTime); // Day of week 0=Sun, 6=Sat
		if( true ) { // Adjust to start on Mon
		    if( $w==0 ) $w=6;
		    else --$w;
		}
		if( $aRound == 0 ) {
		    $d -= $w;
		}
		else {
		    $d += (7-$w);
		    $h=23;$i=59;$s=59;
		}
	    }
	}
	return mktime($h,$i,$s,$m,$d,$y);
	
    }

//------------------------------------------------------------------------------------------
// Wrapper for AdjDate that will round a timestamp to an even date rounding
// it downwards.
//------------------------------------------------------------------------------------------
    function AdjStartDate($aTime,$aYearType=false,$aMonthType=false,$aDayType=false) {
	return $this->AdjDate($aTime,0,$aYearType,$aMonthType,$aDayType);
    }

//------------------------------------------------------------------------------------------
// Wrapper for AdjDate that will round a timestamp to an even date rounding
// it upwards
//------------------------------------------------------------------------------------------
    function AdjEndDate($aTime,$aYearType=false,$aMonthType=false,$aDayType=false) {
	return $this->AdjDate($aTime,1,$aYearType,$aMonthType,$aDayType);
    }

//------------------------------------------------------------------------------------------
// Utility Function AdjTime()
// Description: Will round a given time stamp to an even time according to 
// argument. 
//------------------------------------------------------------------------------------------

    function AdjTime($aTime,$aRound=0,$aHourType=false,$aMinType=false,$aSecType=false) {
	$y = (int)date('Y',$aTime); $m = (int)date('m',$aTime); $d = (int)date('d',$aTime);
	$h = (int)date('H',$aTime); $i = (int)date('i',$aTime); $s = (int)date('s',$aTime);
	if( $aHourType !== false ) {
	    $aHourType %= 6;
	    $hourAdj = array(0=>1, 1=>2, 2=>3, 3=>4, 4=>6, 5=>12);
	    if( $aRound == 0 )
		$h = floor($h/$hourAdj[$aHourType])*$hourAdj[$aHourType];
	    else {
		if( ($h % $hourAdj[$aHourType]==0) && ($i > 0 || $s > 0) ) {
		    $h++;
		}
		$h = ceil($h/$hourAdj[$aHourType])*$hourAdj[$aHourType];
		if( $h >= 24 ) {
		    $aTime += 86400;
		    $y = (int)date('Y',$aTime); $m = (int)date('m',$aTime); $d = (int)date('d',$aTime);
		    $h -= 24; 
		}
	    }
	    $i=0;$s=0;
	}
	elseif( $aMinType !== false ) {
	    $aMinType %= 5;
	    $minAdj = array(0=>1, 1=>5, 2=>10, 3=>15, 4=>30);
	    if( $aRound == 0 ) {
		$i = floor($i/$minAdj[$aMinType])*$minAdj[$aMinType];
	    }
	    else {
		if( ($i % $minAdj[$aMinType]==0) && $s > 0 ) {
		    $i++;
		}
		$i = ceil($i/$minAdj[$aMinType])*$minAdj[$aMinType];
		if( $i >= 60) {
		    $aTime += 3600;
		    $y = (int)date('Y',$aTime); $m = (int)date('m',$aTime); $d = (int)date('d',$aTime);
		    $h = (int)date('H',$aTime); $i = 0;
		}
	    }
	    $s=0;
	}
	elseif( $aSecType !== false ) {
	    $aSecType %= 5;
	    $secAdj = array(0=>1, 1=>5, 2=>10, 3=>15, 4=>30);
	    if( $aRound == 0 ) {
		$s = floor($s/$secAdj[$aSecType])*$secAdj[$aSecType];
	    }
	    else {
		$s = ceil($s/$secAdj[$aSecType]*1.0)*$secAdj[$aSecType];
		if( $s >= 60) {
		    $s=0;
		    $aTime += 60;
		    $y = (int)date('Y',$aTime); $m = (int)date('m',$aTime); $d = (int)date('d',$aTime);
		    $h = (int)date('H',$aTime); $i = (int)date('i',$aTime); 
		}
	    }
	}
	return mktime($h,$i,$s,$m,$d,$y);
    }

//------------------------------------------------------------------------------------------
// Wrapper for AdjTime that will round a timestamp to an even time rounding
// it downwards.
// Example: AdjStartTime(mktime(18,27,13,2,22,2005),false,2) => 18:20
//------------------------------------------------------------------------------------------
    function AdjStartTime($aTime,$aHourType=false,$aMinType=false,$aSecType=false) {
	return $this->AdjTime($aTime,0,$aHourType,$aMinType,$aSecType);
    }

//------------------------------------------------------------------------------------------
// Wrapper for AdjTime that will round a timestamp to an even time rounding
// it upwards
// Example: AdjEndTime(mktime(18,27,13,2,22,2005),false,2) => 18:30
//------------------------------------------------------------------------------------------
    function AdjEndTime($aTime,$aHourType=false,$aMinType=false,$aSecType=false) {
	return $this->AdjTime($aTime,1,$aHourType,$aMinType,$aSecType);
    }

//------------------------------------------------------------------------------------------
// DateAutoScale
// Autoscale a date axis given start and end time
// Returns an array ($start,$end,$major,$minor,$format)
//------------------------------------------------------------------------------------------
    function DoDateAutoScale($aStartTime,$aEndTime,$aDensity=0,$aAdjust=true) {
	// Format of array
	// array ( Decision point,  array( array( Major-scale-step-array ),  
	//			    array( Minor-scale-step-array ), 
	//			    array( 0=date-adjust, 1=time-adjust, adjustment-alignment) )
	//
	$scalePoints = 
	    array(
		/* Intervall larger than 10 years */
		SECPERYEAR*10,array(array(SECPERYEAR*5,SECPERYEAR*2),
				    array(SECPERYEAR), 
				    array(0,YEARADJ_1, 0,YEARADJ_1) ),

		/* Intervall larger than 2 years */
		SECPERYEAR*2,array(array(SECPERYEAR),array(SECPERYEAR), 
				   array(0,YEARADJ_1) ),

		/* Intervall larger than 90 days (approx 3 month) */
		SECPERDAY*90,array(array(SECPERDAY*30,SECPERDAY*14,SECPERDAY*7,SECPERDAY),
				   array(SECPERDAY*5,SECPERDAY*7,SECPERDAY,SECPERDAY), 
				   array(0,MONTHADJ_1, 0,DAYADJ_WEEK, 0,DAYADJ_1, 0,DAYADJ_1)),

		/* Intervall larger than 30 days (approx 1 month) */
		SECPERDAY*30,array(array(SECPERDAY*14,SECPERDAY*7,SECPERDAY*2, SECPERDAY),
				   array(SECPERDAY,SECPERDAY.SECPERDAY,SECPERDAY), 
				   array(0,DAYADJ_WEEK, 0,DAYADJ_1, 0,DAYADJ_1, 0,DAYADJ_1)),

		/* Intervall larger than 7 days */
		SECPERDAY*7,array(array(SECPERDAY,SECPERHOUR*12,SECPERHOUR*6,SECPERHOUR*2),
				  array(SECPERHOUR*6,SECPERHOUR*3,SECPERHOUR,SECPERHOUR),
				  array(0,DAYADJ_1, 1,HOURADJ_12, 1,HOURADJ_6, 1,HOURADJ_1)),

		/* Intervall larger than 1 day */
		SECPERDAY,array(array(SECPERDAY,SECPERHOUR*12,SECPERHOUR*6,SECPERHOUR*2,SECPERHOUR),
				array(SECPERHOUR*6,SECPERHOUR*2,SECPERHOUR,SECPERHOUR,SECPERHOUR),
				array(1,HOURADJ_12, 1,HOURADJ_6, 1,HOURADJ_1, 1,HOURADJ_1)),

		/* Intervall larger than 12 hours */
		SECPERHOUR*12,array(array(SECPERHOUR*2,SECPERHOUR,SECPERMIN*30,900,600),
				    array(1800,1800,900,300,300),
				    array(1,HOURADJ_1, 1,MINADJ_30, 1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5) ),

		/* Intervall larger than 2 hours */
		SECPERHOUR*2,array(array(SECPERHOUR,SECPERMIN*30,900,600,300),
				   array(1800,900,300,120,60),
				   array(1,HOURADJ_1, 1,MINADJ_30, 1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5) ),

		/* Intervall larger than 1 hours */
		SECPERHOUR,array(array(SECPERMIN*30,900,600,300),array(900,300,120,60),
				 array(1,MINADJ_30, 1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5) ),

		/* Intervall larger than 30 min */
		SECPERMIN*30,array(array(SECPERMIN*15,SECPERMIN*10,SECPERMIN*5,SECPERMIN),
				   array(300,300,60,10),
				   array(1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5, 1,MINADJ_1)),

		/* Intervall larger than 1 min */
		SECPERMIN,array(array(SECPERMIN,15,10,5),
				array(15,5,2,1),
				array(1,MINADJ_1, 1,SECADJ_15, 1,SECADJ_10, 1,SECADJ_5)),

		/* Intervall larger than 10 sec */
		10,array(array(5,2),
			 array(1,1),
			 array(1,SECADJ_5, 1,SECADJ_1)),

		/* Intervall larger than 1 sec */
		1,array(array(1),
			array(1),
			array(1,SECADJ_1)),
		);

	$ns = count($scalePoints);
	// Establish major and minor scale units for the date scale
	$diff = $aEndTime - $aStartTime;
	if( $diff < 1 ) return false;
	$done=false;
	$i=0;
	while( ! $done ) {
	    if( $diff > $scalePoints[2*$i] ) {
		// Get major and minor scale for this intervall
		$scaleSteps = $scalePoints[2*$i+1];
		$major = $scaleSteps[0][min($aDensity,count($scaleSteps[0])-1)];
		// Try to find out which minor step looks best
		$minor = $scaleSteps[1][min($aDensity,count($scaleSteps[1])-1)];
		if( $aAdjust ) {
		    // Find out how we should align the start and end timestamps
		    $idx = 2*min($aDensity,floor(count($scaleSteps[2])/2)-1);
		    if( $scaleSteps[2][$idx] === 0 ) { 
			// Use date adjustment
			$adj = $scaleSteps[2][$idx+1]; 
			if( $adj >= 30 ) {
			    $start = $this->AdjStartDate($aStartTime,$adj-30);
			    $end   = $this->AdjEndDate($aEndTime,$adj-30);
			}
			elseif( $adj >= 20 ) {
			    $start = $this->AdjStartDate($aStartTime,false,$adj-20);
			    $end   = $this->AdjEndDate($aEndTime,false,$adj-20);
			}
			else {
			    $start = $this->AdjStartDate($aStartTime,false,false,$adj);
			    $end   = $this->AdjEndDate($aEndTime,false,false,$adj);
			    // We add 1 second for date adjustment to make sure we end on 00:00 the following day
			    // This makes the final major tick be srawn when we step day-by-day instead of ending
			    // on xx:59:59 which would not draw the final major tick
			    $end++;	
			}
		    }
		    else {
			// Use time adjustment
			$adj = $scaleSteps[2][$idx+1]; 
			if( $adj >= 30 ) {
			    $start = $this->AdjStartTime($aStartTime,$adj-30);
			    $end   = $this->AdjEndTime($aEndTime,$adj-30);
			}
			elseif( $adj >= 20 ) {
			    $start = $this->AdjStartTime($aStartTime,false,$adj-20);
			    $end   = $this->AdjEndTime($aEndTime,false,$adj-20);
			}
			else {
			    $start = $this->AdjStartTime($aStartTime,false,false,$adj);
			    $end   = $this->AdjEndTime($aEndTime,false,false,$adj);		    
			}
		    }
		}
		// If the overall date span is larger than 1 day ten we show date
		$format = '';
		if( ($end-$start) > SECPERDAY ) {
		    $format = 'Y-m-d ';
		}
		// If the major step is less than 1 day we need to whow hours + min
		if( $major < SECPERDAY ) {
		    $format .= 'H:i';
		}
		// If the major step is less than 1 min we need to show sec
		if( $major < 60 ) {
		    $format .= ':s';
		}
		$done=true;
	    }
	    ++$i;
	}
	return array($start,$end,$major,$minor,$format);
    }

    // Overrides the automatic determined date format. Must be a valid date() format string
    function SetDateFormat($aFormat) {
	$this->date_format = $aFormat;
    }

    function SetDateAlign($aStartAlign,$aEndAlign=false) {
	if( $aEndAlign === false ) {
	    $aEndAlign=$aStartAlign;
	}
	$this->iStartAlign = $aStartAlign;
	$this->iEndAlign = $aEndAlign;
    }

    function SetTimeAlign($aStartAlign,$aEndAlign=false) {
	if( $aEndAlign === false ) {
	    $aEndAlign=$aStartAlign;
	}
	$this->iStartTimeAlign = $aStartAlign;
	$this->iEndTimeAlign = $aEndAlign;
    }


    function AutoScale(&$img,$aStartTime,$aEndTime,$aNumSteps) {
	if( $aStartTime == $aEndTime ) {
	    // Special case when we only have one data point.
	    // Create a small artifical intervall to do the autoscaling
	    $aStartTime -= 10;
	    $aEndTime += 10;
	}
	$done=false;
	$i=0;
	while( ! $done && $i < 5) {
	    list($adjstart,$adjend,$maj,$min,$format) = $this->DoDateAutoScale($aStartTime,$aEndTime,$i);
	    $n = floor(($adjend-$adjstart)/$maj);
	    if( $n * 1.7 > $aNumSteps ) {
		$done=true;
	    }
	    $i++;
	}
	
	/*
	if( 0 ) { // DEBUG
	    echo "    Start =".date("Y-m-d H:i:s",$aStartTime)."<br>";
	    echo "    End   =".date("Y-m-d H:i:s",$aEndTime)."<br>";
	    echo "Adj Start =".date("Y-m-d H:i:s",$adjstart)."<br>";
	    echo "Adj End   =".date("Y-m-d H:i:s",$adjend)."<p>";
	    echo "Major = $maj s, ".floor($maj/60)."min, ".floor($maj/3600)."h, ".floor($maj/86400)."day<br>";
	    echo "Min = $min s, ".floor($min/60)."min, ".floor($min/3600)."h, ".floor($min/86400)."day<br>";
	    echo "Format=$format<p>";
	}
	*/
	
	if( $this->iStartTimeAlign !== false && $this->iStartAlign !== false ) {
	    JpGraphError::RaiseL(3001);
//('It is only possible to use either SetDateAlign() or SetTimeAlign() but not both');
	}

	if( $this->iStartTimeAlign !== false ) {
	    if( $this->iStartTimeAlign >= 30 ) {
		$adjstart = $this->AdjStartTime($aStartTime,$this->iStartTimeAlign-30);
	    }
	    elseif(  $this->iStartTimeAlign >= 20 ) {
		$adjstart = $this->AdjStartTime($aStartTime,false,$this->iStartTimeAlign-20);
	    }
	    else {
		$adjstart = $this->AdjStartTime($aStartTime,false,false,$this->iStartTimeAlign);
	    }
	}
	if( $this->iEndTimeAlign !== false ) {
	    if( $this->iEndTimeAlign >= 30 ) {
		$adjend = $this->AdjEndTime($aEndTime,$this->iEndTimeAlign-30);
	    }
	    elseif(  $this->iEndTimeAlign >= 20 ) {
		$adjend = $this->AdjEndTime($aEndTime,false,$this->iEndTimeAlign-20);
	    }
	    else {
		$adjend = $this->AdjEndTime($aEndTime,false,false,$this->iEndTimeAlign);
	    }
	}


	
	if( $this->iStartAlign !== false ) {
	    if( $this->iStartAlign >= 30 ) {
		$adjstart = $this->AdjStartDate($aStartTime,$this->iStartAlign-30);
	    }
	    elseif(  $this->iStartAlign >= 20 ) {
		$adjstart = $this->AdjStartDate($aStartTime,false,$this->iStartAlign-20);
	    }
	    else {
		$adjstart = $this->AdjStartDate($aStartTime,false,false,$this->iStartAlign);
	    }
	}
	if( $this->iEndAlign !== false ) {
	    if( $this->iEndAlign >= 30 ) {
		$adjend = $this->AdjEndDate($aEndTime,$this->iEndAlign-30);
	    }
	    elseif(  $this->iEndAlign >= 20 ) {
		$adjend = $this->AdjEndDate($aEndTime,false,$this->iEndAlign-20);
	    }
	    else {
		$adjend = $this->AdjEndDate($aEndTime,false,false,$this->iEndAlign);
	    }
	}
	$this->Update($img,$adjstart,$adjend);
	if( ! $this->ticks->IsSpecified() )
	    $this->ticks->Set($maj,$min);
	if( $this->date_format == '' ) 
	    $this->ticks->SetLabelDateFormat($format);
	else 
	    $this->ticks->SetLabelDateFormat($this->date_format);
    }
}


?>