<?php // content="text/plain; charset=utf-8" 
/**
* Class CCBPGraph
* Utility class to create Critical Chain Buffer penetration charts
*/
class CCBPGraph {
    const TickStep = 25;
    const YTitle = '% Buffer used';
    const XTitle = '% CC Completed';
    const NColorMaps = 2;
	private $graph=null;
	private $iWidth,$iHeight;
	private $iPlots=array();
	private $iXMin=-50, $iXMax = 100;
	private $iYMin=-50, $iYMax = 150;
	private $iColorInd = array( 
		array(5,75),   /* Green */
		array(25,85),  /* Yellow */
		array(50,100));/* Red */ 
	private $iColorMap = 0;
    private $iColorSpec = array(
                array('darkgreen:1.0','yellow:1.4','red:0.8','darkred:0.85'),
                array('#c6e9af','#ffeeaa','#ffaaaa','#de8787'));
    private $iMarginColor = array('darkgreen@0.7','darkgreen@0.9');                
	private $iSubTitle='',$iTitle = 'CC Buffer penetration';
    /**
    * Construct a new instance of CCBPGraph 
    * 
    * @param int $aWidth
    * @param int $aHeight
    * @return CCBPGraph
    */
	public function __construct($aWidth, $aHeight) {
		$this->iWidth = $aWidth;
		$this->iHeight = $aHeight;
	}
	/**
    * Set the title and subtitle for the graph
    * 
    * @param string $aTitle
    * @param string $aSubTitle
    */
	public function SetTitle($aTitle, $aSubTitle) {
		$this->iTitle = $aTitle;
		$this->iSubTitle = $aSubTitle;
	}
	/**
    * Set the x-axis min and max values
    * 
    * @param int $aMin
    * @param int $aMax
    */
	public function SetXMinMax($aMin, $aMax) {
		$this->iXMin = floor($aMin/CCBPGraph::TickStep)*CCBPGraph::TickStep;
		$this->iXMax = ceil($aMax/CCBPGraph::TickStep)*CCBPGraph::TickStep;
	}
    /**
    * Specify what color map to use
    * 
    * @param int $aMap
    */
    public function SetColorMap($aMap) {
        $this->iColorMap = $aMap % CCBPGraph::NColorMaps;
    }
	/**
    * Set the y-axis min and max values
    * 
    * @param int $aMin
    * @param int $aMax
    */
	public function SetYMinMax($aMin,$aMax) {
		$this->iYMin = floor($aMin/CCBPGraph::TickStep)*CCBPGraph::TickStep;
		$this->iYMax = ceil($aMax/CCBPGraph::TickStep)*CCBPGraph::TickStep;
	}
	/**
    * Set the specification of the color backgrounds and also the
    * optional exact colors to be used
    * 
    * @param mixed $aSpec  An array of 3 1x2 arrays. Each array specify the 
    * color indication value at x=0 and x=max x in order to determine the slope
    * @param mixed $aColors  An array with four elements specifying the colors
    * of each color indicator
    */
	public function SetColorIndication(array $aSpec,array $aColors=null) {
		if( count($aSpec) !== 3 ) {
			JpgraphError::Raise('Specification of scale values for background indicators must be an array with three elements.');
		}
		$this->iColorInd = $aSpec;	
		if( $aColors !== null ) {
            if( is_array($aColors) && count($aColors) == 4 ) {
			    $this->iColorSpec = $aColors;
            }
            else {
                JpGraphError::Raise('Color specification for background indication must have four colors.');
            }
		}		
	}
	/**
    * Construct the graph
    * 
    */
	private function Init() {

		// Setup limits for color indications
		$lowx = $this->iXMin; $highx= $this->iXMax;
		$lowy = $this->iYMin; $highy = $this->iYMax;
 		$width=$this->iWidth; $height=$this->iHeight;

		// Margins
		$lm=50; $rm=40;
		$tm=60; $bm=40;
        
        if( $width <= 300 || $height <= 250 ) {
            $labelsize = 8;
            $lm=25; $rm=25;
            $tm=45; $bm=25;
        }				
		elseif( $width <= 450 || $height <= 300 ) {
			$labelsize = 8;
			$lm=30; $rm=30;
			$tm=50; $bm=30;
		}
		elseif( $width <= 600 || $height <= 400 ) {
			$labelsize = 9;		
		}
		else {
			$labelsize = 11;
		}	
        
        if( $this->iSubTitle == '' ) {
            $tm -= $labelsize+4;
        } 	

		$graph = new Graph($width,$height);
		$graph->SetScale('intint',$lowy,$highy,$lowx,$highx);
		$graph->SetMargin($lm,$rm,$tm,$bm);
		$graph->SetMarginColor($this->iMarginColor[$this->iColorMap]);
		$graph->SetClipping();
		
		$graph->title->Set($this->iTitle);
		$graph->subtitle->Set($this->iSubTitle);
		
		$graph->title->SetFont(FF_ARIAL,FS_BOLD,$labelsize+4);
		$graph->subtitle->SetFont(FF_ARIAL,FS_BOLD,$labelsize+1);
		
		$graph->SetBox(true,'black@0.3');

		$graph->xaxis->SetFont(FF_ARIAL,FS_BOLD,$labelsize);
		$graph->yaxis->SetFont(FF_ARIAL,FS_BOLD,$labelsize);
		
		$graph->xaxis->scale->ticks->Set(CCBPGraph::TickStep,CCBPGraph::TickStep);
		$graph->yaxis->scale->ticks->Set(CCBPGraph::TickStep,CCBPGraph::TickStep);
		
		$graph->xaxis->HideZeroLabel();
		$graph->yaxis->HideZeroLabel();
		        
        $graph->xaxis->SetLabelFormatString('%d%%');
        $graph->yaxis->SetLabelFormatString('%d%%');
        
		// For the x-axis we adjust the color so labels on the left of the Y-axis are in black
		$n1 = floor(abs($this->iXMin/25))+1;
		$n2 = floor($this->iXMax/25);
        if( $this->iColorMap == 0 ) {
		    $xlcolors=array();
		    for( $i = 0; $i < $n1; ++$i ) {
			    $xlcolors[$i] = 'black';
		    }
		    for( $i = 0; $i < $n2; ++$i ) {
			    $xlcolors[$n1+$i] = 'lightgray:1.5';
		    }
		    $graph->xaxis->SetColor('gray',$xlcolors);
		    $graph->yaxis->SetColor('gray','lightgray:1.5');
        }
        else {
            $graph->xaxis->SetColor('darkgray','darkgray:0.8');
            $graph->yaxis->SetColor('darkgray','darkgray:0.8');            
        }
		$graph->SetGridDepth(DEPTH_FRONT);
		$graph->ygrid->SetColor('gray@0.6');
		$graph->ygrid->SetLineStyle('dotted');
		
		$graph->ygrid->Show();
		
		$graph->xaxis->SetWeight(1);
		$graph->yaxis->SetWeight(1);
		
		$ytitle = new Text(CCBPGraph::YTitle,floor($lm*.75),($height-$tm-$bm)/2+$tm);
		$ytitle->SetFont(FF_VERA,FS_BOLD,$labelsize+1);
		$ytitle->SetAlign('right','center');
		$ytitle->SetAngle(90);
		$graph->Add($ytitle);
		
		$xtitle = new Text(CCBPGraph::XTitle,($width-$lm-$rm)/2+$lm,$height - 10);
		$xtitle->SetFont(FF_VERA,FS_BOLD,$labelsize);
		$xtitle->SetAlign('center','bottom');
		$graph->Add($xtitle);
		
		$df = 'D j:S M, Y'; 
		if( $width < 400 ) {
			$df = 'D j:S M';
		}
		
		$time = new Text(date($df),$width-10,$height-10);
		$time->SetAlign('right','bottom');
		$time->SetFont(FF_VERA,FS_NORMAL,$labelsize-1);
		$time->SetColor('darkgray');
		$graph->Add($time);

		// Use an accumulated fille line graph to create the colored bands
       
        $n = 3;
        for( $i=0; $i < $n; ++$i ) {
            $b = $this->iColorInd[$i][0];
            $k = ($this->iColorInd[$i][1] - $this->iColorInd[$i][0])/$this->iXMax;
            $colarea[$i] = array( array($lowx,$lowx*$k+$b), array($highx,$highx*$k+$b) );
        }
        $colarea[3] = array( array($lowx,$highy), array($highx,$highy) );
        
        
		$cb = array();
		for( $i=0; $i < 4; ++$i ) {
			$cb[$i] = new LinePlot(array($colarea[$i][0][1],$colarea[$i][1][1]),
								   array($colarea[$i][0][0],$colarea[$i][1][0]));
			$cb[$i]->SetFillColor($this->iColorSpec[$this->iColorMap][$i]);
			$cb[$i]->SetFillFromYMin();								   
		}

		$graph->Add(array_slice(array_reverse($cb),0,4));	
		$this->graph = $graph;
	}
    /**
    * Add a line or scatter plot to the graph
    * 
    * @param mixed $aPlots
    */
    public function Add($aPlots) {
        if( is_array($aPlots) ) {
            $this->iPlots = array_merge($this->iPlots,$aPlots);                
        }
        else {
            $this->iPlots[] = $aPlots;
        }
    }
    /**
    * Stroke the graph back to the client or to a file
    * 
    * @param mixed $aFile
    */
	public function Stroke($aFile='') {
		$this->Init();
        if( count($this->iPlots) > 0 )  {
		    $this->graph->Add($this->iPlots);
        }
		$this->graph->Stroke($aFile);
	}
}
?>
