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<?php

/*=======================================================================

// File: 	JPGRAPH_LINE.PHP

// Description:	Line plot extension for JpGraph

// Created: 	2001-01-08

// Ver:		$Id: jpgraph_line.php 982 2008-03-24 11:51:47Z ljp $

//

// Copyright (c) Aditus Consulting. All rights reserved.

//========================================================================

*/

require_once ('jpgraph_plotmark.inc.php');

// constants for the (filled) area

DEFINE("LP_AREA_FILLED", true);

DEFINE("LP_AREA_NOT_FILLED", false);

DEFINE("LP_AREA_BORDER",false);

DEFINE("LP_AREA_NO_BORDER",true);

//===================================================

// CLASS LinePlot

// Description:

//===================================================

class LinePlot extends Plot{

    var $filled=false;

    var $fill_color='blue';

    var $mark=null;

    var $step_style=false, $center=false;

    var $line_style=1;	// Default to solid

    var $filledAreas = array(); // array of arrays(with min,max,col,filled in them)

    var $barcenter=false;  // When we mix line and bar. Should we center the line in the bar.

    var $fillFromMin = false ;

    var $fillgrad=false,$fillgrad_fromcolor='navy',$fillgrad_tocolor='silver',$fillgrad_numcolors=100;

    var $iFastStroke=false;

//---------------

// CONSTRUCTOR

    function LinePlot(&$datay,$datax=false) {

	$this->Plot($datay,$datax);

	$this->mark = new PlotMark();

    }

//---------------

// PUBLIC METHODS

    // Set style, filled or open

    function SetFilled($aFlag=true) {

    	JpGraphError::RaiseL(10001);//('LinePlot::SetFilled() is deprecated. Use SetFillColor()');

    }

    function SetBarCenter($aFlag=true) {

	$this->barcenter=$aFlag;

    }

    function SetStyle($aStyle) {

	$this->line_style=$aStyle;

    }

    function SetStepStyle($aFlag=true) {

	$this->step_style = $aFlag;

    }

    function SetColor($aColor) {

	parent::SetColor($aColor);

    }

    function SetFillFromYMin($f=true) {

	$this->fillFromMin = $f ;

    }

    function SetFillColor($aColor,$aFilled=true) {

	$this->fill_color=$aColor;

	$this->filled=$aFilled;

    }

    function SetFillGradient($aFromColor,$aToColor,$aNumColors=100,$aFilled=true) {

	$this->fillgrad_fromcolor = $aFromColor;

	$this->fillgrad_tocolor   = $aToColor;

	$this->fillgrad_numcolors = $aNumColors;

	$this->filled = $aFilled;

	$this->fillgrad = true;

    }

    function Legend(&$graph) {

	if( $this->legend!="" ) {

	    if( $this->filled && !$this->fillgrad ) {

		$graph->legend->Add($this->legend,

				    $this->fill_color,$this->mark,0,

				    $this->legendcsimtarget,$this->legendcsimalt,$this->legendcsimwintarget);

	    }

	    elseif( $this->fillgrad ) {

		$color=array($this->fillgrad_fromcolor,$this->fillgrad_tocolor);

		// In order to differentiate between gradients and cooors specified as an RGB triple

		$graph->legend->Add($this->legend,$color,"",-2 /* -GRAD_HOR */,

				    $this->legendcsimtarget,$this->legendcsimalt,$this->legendcsimwintarget);

	    }

	    else {

		$graph->legend->Add($this->legend,

				    $this->color,$this->mark,$this->line_style,

				    $this->legendcsimtarget,$this->legendcsimalt,$this->legendcsimwintarget);

	    }

	}

    }

    function AddArea($aMin=0,$aMax=0,$aFilled=LP_AREA_NOT_FILLED,$aColor="gray9",$aBorder=LP_AREA_BORDER) {

	if($aMin > $aMax) {

	    // swap

	    $tmp = $aMin;

	    $aMin = $aMax;

	    $aMax = $tmp;

	}

	$this->filledAreas[] = array($aMin,$aMax,$aColor,$aFilled,$aBorder);

    }

    // Gets called before any axis are stroked

    function PreStrokeAdjust(&$graph) {

	// If another plot type have already adjusted the

	// offset we don't touch it.

	// (We check for empty in case the scale is  a log scale

	// and hence doesn't contain any xlabel_offset)

	if( empty($graph->xaxis->scale->ticks->xlabel_offset) ||

	    $graph->xaxis->scale->ticks->xlabel_offset == 0 ) {

	    if( $this->center ) {

		++$this->numpoints;

		$a=0.5; $b=0.5;

	    } else {

		$a=0; $b=0;

	    }

	    $graph->xaxis->scale->ticks->SetXLabelOffset($a);

	    $graph->SetTextScaleOff($b);

	    //$graph->xaxis->scale->ticks->SupressMinorTickMarks();

	}

    }

    function SetFastStroke($aFlg=true) {

	$this->iFastStroke = $aFlg;

    }

    function FastStroke(&$img,&$xscale,&$yscale,$aStartPoint=0,$exist_x=true) {

	// An optimized stroke for many data points with no extra

	// features but 60% faster. You can't have values or line styles, or null

	// values in plots.

	$numpoints=count($this->coords[0]);

	if( $this->barcenter )

	    $textadj = 0.5-$xscale->text_scale_off;

	else

	    $textadj = 0;

	$img->SetColor($this->color);

	$img->SetLineWeight($this->weight);

	$pnts=$aStartPoint;

	while( $pnts < $numpoints ) {

	    if( $exist_x ) $x=$this->coords[1][$pnts];

	    else $x=$pnts+$textadj;

	    $xt = $xscale->Translate($x);

	    $y=$this->coords[0][$pnts];

	    $yt = $yscale->Translate($y);

	    if( is_numeric($y) ) {

		$cord[] = $xt;

		$cord[] = $yt;

	    }

	    elseif( $y == '-' && $pnts > 0 ) {

		// Just ignore

	    }

	    else {

		JpGraphError::RaiseL(10002);//('Plot too complicated for fast line Stroke. Use standard Stroke()');

		return;

	    }

	    ++$pnts;

	} // WHILE

	$img->Polygon($cord,false,true);

    }

    function Stroke(&$img,&$xscale,&$yscale) {

	$idx=0;

	$numpoints=count($this->coords[0]);

	if( isset($this->coords[1]) ) {

	    if( count($this->coords[1])!=$numpoints )

		JpGraphError::RaiseL(2003,count($this->coords[1]),$numpoints);

//("Number of X and Y points are not equal. Number of X-points:".count($this->coords[1])." Number of Y-points:$numpoints");

	    else

		$exist_x = true;

	}

	else

	    $exist_x = false;

	if( $this->barcenter )

	    $textadj = 0.5-$xscale->text_scale_off;

	else

	    $textadj = 0;

	// Find the first numeric data point

	$startpoint=0;

	while( $startpoint < $numpoints && !is_numeric($this->coords[0][$startpoint]) )

	    ++$startpoint;

	// Bail out if no data points

	if( $startpoint == $numpoints )

	    return;

	if( $this->iFastStroke ) {

	    $this->FastStroke($img,$xscale,$yscale,$startpoint,$exist_x);

	    return;

	}

	if( $exist_x )

	    $xs=$this->coords[1][$startpoint];

	else

	    $xs= $textadj+$startpoint;

	$img->SetStartPoint($xscale->Translate($xs),

			    $yscale->Translate($this->coords[0][$startpoint]));

	if( $this->filled ) {

	    $min = $yscale->GetMinVal();

	    if( $min > 0 || $this->fillFromMin )

		$fillmin = $yscale->scale_abs[0];//Translate($min);

	    else

		$fillmin = $yscale->Translate(0);

	    $cord[$idx++] = $xscale->Translate($xs);

	    $cord[$idx++] = $fillmin;

	}

	$xt = $xscale->Translate($xs);

	$yt = $yscale->Translate($this->coords[0][$startpoint]);

	$cord[$idx++] = $xt;

	$cord[$idx++] = $yt;

	$yt_old = $yt;

	$xt_old = $xt;

	$y_old = $this->coords[0][$startpoint];

	$this->value->Stroke($img,$this->coords[0][$startpoint],$xt,$yt);

	$img->SetColor($this->color);

	$img->SetLineWeight($this->weight);

	$img->SetLineStyle($this->line_style);

	$pnts=$startpoint+1;

	$firstnonumeric = false;

	while( $pnts < $numpoints ) {

	    if( $exist_x ) $x=$this->coords[1][$pnts];

	    else $x=$pnts+$textadj;

	    $xt = $xscale->Translate($x);

	    $yt = $yscale->Translate($this->coords[0][$pnts]);

	    $y=$this->coords[0][$pnts];

	    if( $this->step_style ) {

		// To handle null values within step style we need to record the

		// first non numeric value so we know from where to start if the

		// non value is '-'.

		if( is_numeric($y) ) {

		    $firstnonumeric = false;

		    if( is_numeric($y_old) ) {

			$img->StyleLine($xt_old,$yt_old,$xt,$yt_old);

			$img->StyleLine($xt,$yt_old,$xt,$yt);

		    }

		    elseif( $y_old == '-' ) {

			$img->StyleLine($xt_first,$yt_first,$xt,$yt_first);

			$img->StyleLine($xt,$yt_first,$xt,$yt);

		    }

		    else {

			$yt_old = $yt;

			$xt_old = $xt;

		    }

		    $cord[$idx++] = $xt;

		    $cord[$idx++] = $yt_old;

		    $cord[$idx++] = $xt;

		    $cord[$idx++] = $yt;

		}

		elseif( $firstnonumeric==false ) {

		    $firstnonumeric = true;

		    $yt_first = $yt_old;

		    $xt_first = $xt_old;

		}

	    }

	    else {

		$tmp1=$y;

		$prev=$this->coords[0][$pnts-1];

		if( $tmp1==='' || $tmp1===NULL || $tmp1==='X' ) $tmp1 = 'x';

		if( $prev==='' || $prev===null || $prev==='X' ) $prev = 'x';

		if( is_numeric($y) || (is_string($y) && $y != '-') ) {

		    if( is_numeric($y) && (is_numeric($prev) || $prev === '-' ) ) {

			$img->StyleLineTo($xt,$yt);

		    }

		    else {

			$img->SetStartPoint($xt,$yt);

		    }

		}

		if( $this->filled && $tmp1 !== '-' ) {

		    if( $tmp1 === 'x' ) {

			$cord[$idx++] = $cord[$idx-3];

			$cord[$idx++] = $fillmin;

		    }

		    elseif( $prev === 'x' ) {

			$cord[$idx++] = $xt;

			$cord[$idx++] = $fillmin;

			$cord[$idx++] = $xt;

			$cord[$idx++] = $yt;

		    }

		    else {

			$cord[$idx++] = $xt;

			$cord[$idx++] = $yt;

		    }

		}

		else {

		    if( is_numeric($tmp1)  && (is_numeric($prev) || $prev === '-' ) ) {

			$cord[$idx++] = $xt;

			$cord[$idx++] = $yt;

		    }

		}

	    }

	    $yt_old = $yt;

	    $xt_old = $xt;

	    $y_old = $y;

	    $this->StrokeDataValue($img,$this->coords[0][$pnts],$xt,$yt);

	    ++$pnts;

	}

	if( $this->filled  ) {

	    $cord[$idx++] = $xt;

	    if( $min > 0 || $this->fillFromMin )

		$cord[$idx++] = $yscale->Translate($min);

	    else

		$cord[$idx++] = $yscale->Translate(0);

	    if( $this->fillgrad ) {

		$img->SetLineWeight(1);

		$grad = new Gradient($img);

		$grad->SetNumColors($this->fillgrad_numcolors);

		$grad->FilledFlatPolygon($cord,$this->fillgrad_fromcolor,$this->fillgrad_tocolor);

		$img->SetLineWeight($this->weight);

	    }

	    else {

		$img->SetColor($this->fill_color);

		$img->FilledPolygon($cord);

	    }

	    if( $this->line_weight > 0 ) {

		$img->SetColor($this->color);

		$img->Polygon($cord);

	    }

	}

	if(!empty($this->filledAreas)) {

	    $minY = $yscale->Translate($yscale->GetMinVal());

	    $factor = ($this->step_style ? 4 : 2);

	    for($i = 0; $i < sizeof($this->filledAreas); ++$i) {

		// go through all filled area elements ordered by insertion

		// fill polygon array

		$areaCoords[] = $cord[$this->filledAreas[$i][0] * $factor];

		$areaCoords[] = $minY;

		$areaCoords =

		    array_merge($areaCoords,

				array_slice($cord,

					    $this->filledAreas[$i][0] * $factor,

					    ($this->filledAreas[$i][1] - $this->filledAreas[$i][0] + ($this->step_style ? 0 : 1))  * $factor));

		$areaCoords[] = $areaCoords[sizeof($areaCoords)-2]; // last x

		$areaCoords[] = $minY; // last y

		if($this->filledAreas[$i][3]) {

		    $img->SetColor($this->filledAreas[$i][2]);

		    $img->FilledPolygon($areaCoords);

		    $img->SetColor($this->color);

		}

		// Check if we should draw the frame.

		// If not we still re-draw the line since it might have been

		// partially overwritten by the filled area and it doesn't look

		// very good.

		// TODO: The behaviour is undefined if the line does not have

		// any line at the position of the area.

		if( $this->filledAreas[$i][4] )

		    $img->Polygon($areaCoords);

		else

	    	    $img->Polygon($cord);

		$areaCoords = array();

	    }

	}

	if( $this->mark->type == -1 || $this->mark->show == false )

	    return;

	for( $pnts=0; $pnts<$numpoints; ++$pnts) {

	    if( $exist_x ) $x=$this->coords[1][$pnts];

	    else $x=$pnts+$textadj;

	    $xt = $xscale->Translate($x);

	    $yt = $yscale->Translate($this->coords[0][$pnts]);

	    if( is_numeric($this->coords[0][$pnts]) ) {

		if( !empty($this->csimtargets[$pnts]) ) {

		    if( !empty($this->csimwintargets[$pnts]) ) {

			$this->mark->SetCSIMTarget($this->csimtargets[$pnts],$this->csimwintargets[$pnts]);

		    }

		    else {

			$this->mark->SetCSIMTarget($this->csimtargets[$pnts]);

		    }

		    $this->mark->SetCSIMAlt($this->csimalts[$pnts]);

		}

		if( $exist_x )

		    $x=$this->coords[1][$pnts];

		else

		    $x=$pnts;

		$this->mark->SetCSIMAltVal($this->coords[0][$pnts],$x);

		$this->mark->Stroke($img,$xt,$yt);

		$this->csimareas .= $this->mark->GetCSIMAreas();

	    }

	}

    }

} // Class

//===================================================

// CLASS AccLinePlot

// Description:

//===================================================

class AccLinePlot extends Plot {

    var $plots=null,$nbrplots=0,$numpoints=0;

    var $iStartEndZero=true;

//---------------

// CONSTRUCTOR

    function AccLinePlot($plots) {

        $this->plots = $plots;

	$this->nbrplots = count($plots);

	$this->numpoints = $plots[0]->numpoints;

	// Verify that all plots have the same number of data points

	for( $i=1; $i < $this->nbrplots; ++$i ) {

	    if( $plots[$i]->numpoints != $this->numpoints ) {

		JpGraphError::RaiseL(10003);//('Each plot in an accumulated lineplot must have the same number of data points',0)

	    }

	}

	for($i=0; $i < $this->nbrplots; ++$i ) {

	    $this->LineInterpolate($this->plots[$i]->coords[0]);

	}

    }

//---------------

// PUBLIC METHODS

    function Legend(&$graph) {

	$n=count($this->plots);

	for($i=0; $i < $n; ++$i )

	    $this->plots[$i]->DoLegend($graph);

    }

    function Max() {

	list($xmax) = $this->plots[0]->Max();

	$nmax=0;

	$n = count($this->plots);

	for($i=0; $i < $n; ++$i) {

	    $nc = count($this->plots[$i]->coords[0]);

	    $nmax = max($nmax,$nc);

	    list($x) = $this->plots[$i]->Max();

	    $xmax = Max($xmax,$x);

	}

	for( $i = 0; $i < $nmax; $i++ ) {

	    // Get y-value for line $i by adding the

	    // individual bars from all the plots added.

	    // It would be wrong to just add the

	    // individual plots max y-value since that

	    // would in most cases give to large y-value.

	    $y=$this->plots[0]->coords[0][$i];

	    for( $j = 1; $j < $this->nbrplots; $j++ ) {

		$y += $this->plots[ $j ]->coords[0][$i];

	    }

	    $ymax[$i] = $y;

	}

	$ymax = max($ymax);

	return array($xmax,$ymax);

    }

    function Min() {

	$nmax=0;

	list($xmin,$ysetmin) = $this->plots[0]->Min();

	$n = count($this->plots);

	for($i=0; $i < $n; ++$i) {

	    $nc = count($this->plots[$i]->coords[0]);

	    $nmax = max($nmax,$nc);

	    list($x,$y) = $this->plots[$i]->Min();

	    $xmin = Min($xmin,$x);

	    $ysetmin = Min($y,$ysetmin);

	}

	for( $i = 0; $i < $nmax; $i++ ) {

	    // Get y-value for line $i by adding the

	    // individual bars from all the plots added.

	    // It would be wrong to just add the

	    // individual plots min y-value since that

	    // would in most cases give to small y-value.

	    $y=$this->plots[0]->coords[0][$i];

	    for( $j = 1; $j < $this->nbrplots; $j++ ) {

		$y += $this->plots[ $j ]->coords[0][$i];

	    }

	    $ymin[$i] = $y;

	}

	$ymin = Min($ysetmin,Min($ymin));

	return array($xmin,$ymin);

    }

    // Gets called before any axis are stroked

    function PreStrokeAdjust(&$graph) {

	// If another plot type have already adjusted the

	// offset we don't touch it.

	// (We check for empty in case the scale is  a log scale

	// and hence doesn't contain any xlabel_offset)

	if( empty($graph->xaxis->scale->ticks->xlabel_offset) ||

	    $graph->xaxis->scale->ticks->xlabel_offset == 0 ) {

	    if( $this->center ) {

		++$this->numpoints;

		$a=0.5; $b=0.5;

	    } else {

		$a=0; $b=0;

	    }

	    $graph->xaxis->scale->ticks->SetXLabelOffset($a);

	    $graph->SetTextScaleOff($b);

	    $graph->xaxis->scale->ticks->SupressMinorTickMarks();

	}

    }

    function SetInterpolateMode($aIntMode) {

	$this->iStartEndZero=$aIntMode;

    }

    // Replace all '-' with an interpolated value. We use straightforward

    // linear interpolation. If the data starts with one or several '-' they

    // will be replaced by the the first valid data point

    function LineInterpolate(&$aData) {

	$n=count($aData);

	$i=0;

	// If first point is undefined we will set it to the same as the first

	// valid data

	if( $aData[$i]==='-' ) {

	    // Find the first valid data

	    while( $i < $n && $aData[$i]==='-' ) {

		++$i;

	    }

	    if( $i < $n ) {

		for($j=0; $j < $i; ++$j ) {

		    if( $this->iStartEndZero )

			$aData[$i] = 0;

		    else

			$aData[$j] = $aData[$i];

		}

	    }

	    else {

		// All '-' => Error

		return false;

	    }

	}

	while($i < $n) {

	    while( $i < $n && $aData[$i] !== '-' ) {

		++$i;

	    }

	    if( $i < $n ) {

		$pstart=$i-1;

		// Now see how long this segment of '-' are

		while( $i < $n && $aData[$i] === '-' )

		    ++$i;

		if( $i < $n ) {

		    $pend=$i;

		    $size=$pend-$pstart;

		    $k=($aData[$pend]-$aData[$pstart])/$size;

		    // Replace the segment of '-' with a linear interpolated value.

		    for($j=1; $j < $size; ++$j ) {

			$aData[$pstart+$j] = $aData[$pstart] + $j*$k ;

		    }

		}

		else {

		    // There are no valid end point. The '-' goes all the way to the end

		    // In that case we just set all the remaining values the the same as the

		    // last valid data point.

		    for( $j=$pstart+1; $j < $n; ++$j )

			if( $this->iStartEndZero )

			    $aData[$j] = 0;

			else

			    $aData[$j] = $aData[$pstart] ;

		}

	    }

	}

	return true;

    }

    // To avoid duplicate of line drawing code here we just

    // change the y-values for each plot and then restore it

    // after we have made the stroke. We must do this copy since

    // it wouldn't be possible to create an acc line plot

    // with the same graphs, i.e AccLinePlot(array($pl,$pl,$pl));

    // since this method would have a side effect.

    function Stroke(&$img,&$xscale,&$yscale) {

	$img->SetLineWeight($this->weight);

	$this->numpoints = count($this->plots[0]->coords[0]);

	// Allocate array

	$coords[$this->nbrplots][$this->numpoints]=0;

	for($i=0; $i<$this->numpoints; $i++) {

	    $coords[0][$i]=$this->plots[0]->coords[0][$i];

	    $accy=$coords[0][$i];

	    for($j=1; $j<$this->nbrplots; ++$j ) {

		$coords[$j][$i] = $this->plots[$j]->coords[0][$i]+$accy;

		$accy = $coords[$j][$i];

	    }

	}

	for($j=$this->nbrplots-1; $j>=0; --$j) {

	    $p=$this->plots[$j];

	    for( $i=0; $i<$this->numpoints; ++$i) {

		$tmp[$i]=$p->coords[0][$i];

		$p->coords[0][$i]=$coords[$j][$i];

	    }

	    $p->Stroke($img,$xscale,$yscale);

	    for( $i=0; $i<$this->numpoints; ++$i)

		$p->coords[0][$i]=$tmp[$i];

	    $p->coords[0][]=$tmp;

	}

    }

} // Class

/* EOF */

?>