<?php
//=======================================================================
// File:        JPGRAPH_LEGEND.INC.PHP
// Description: Class to handle the legend box in the graph that gives
//              names on the data series. The number of rows and columns
//              in the legend are user specifyable.
// Created:     2001-01-08 (Refactored to separate file 2008-08-01)
// Ver:         $Id: jpgraph_legend.inc.php 1926 2010-01-11 16:33:07Z ljp $
//
// Copyright (c) Asial Corporation. All rights reserved.
//========================================================================

DEFINE('_DEFAULT_LPM_SIZE', 8); // Default Legend Plot Mark size


//===================================================
// CLASS Legend
// Description: Responsible for drawing the box containing
// all the legend text for the graph
//===================================================

class Legend
{
    public $txtcol=array();
    public $font_family=FF_DEFAULT;
    public $font_style=FS_NORMAL;
    public $font_size=8; // old. 12
    private $color=array(120,120,120); // Default frame color
    private $fill_color=array(245,245,245); // Default fill color
    private $shadow=false; // Shadow around legend "box"
    private $shadow_color='darkgray';
    private $mark_abs_hsize=_DEFAULT_LPM_SIZE;
    private $mark_abs_vsize=_DEFAULT_LPM_SIZE;
    private $xmargin=10;
    private $ymargin=0;
    private $shadow_width=2;
    private $xlmargin=4;
    private $ylinespacing=5;
    
    // We need a separate margin since the baseline of the last text would coincide with the bottom otherwise
    private $ybottom_margin = 8;
    
    private $xpos=0.05;
    
    private $ypos=0.15;
    
    private $xabspos=-1;
    
    private $yabspos=-1;
    private $halign="right";
    private $valign="top";
    private $font_color='black';
    private $hide=false;
    private $layout_n=1;
    private $weight=1;
    private $frameweight=1;
    private $csimareas='';
    private $reverse = false ;
    private $bkg_gradtype=-1;
    private $bkg_gradfrom='lightgray';
    private $bkg_gradto='gray';

    //---------------
    // CONSTRUCTOR
    public function __construct()
    {
        // Empty
    }
    //---------------
    // PUBLIC METHODS
    public function Hide($aHide=true)
    {
        $this->hide=$aHide;
    }

    public function SetHColMargin($aXMarg)
    {
        $this->xmargin = $aXMarg;
    }

    public function SetVColMargin($aSpacing)
    {
        $this->ylinespacing = $aSpacing ;
    }

    public function SetLeftMargin($aXMarg)
    {
        $this->xlmargin = $aXMarg;
    }

    // Synonym
    public function SetLineSpacing($aSpacing)
    {
        $this->ylinespacing = $aSpacing ;
    }

    public function SetShadow($aShow='gray', $aWidth=4)
    {
        if (is_string($aShow)) {
            $this->shadow_color = $aShow;
            $this->shadow=true;
        } else {
            $this->shadow = $aShow;
        }
        $this->shadow_width = $aWidth;
    }

    public function SetMarkAbsSize($aSize)
    {
        $this->mark_abs_vsize = $aSize ;
        $this->mark_abs_hsize = $aSize ;
    }

    public function SetMarkAbsVSize($aSize)
    {
        $this->mark_abs_vsize = $aSize ;
    }

    public function SetMarkAbsHSize($aSize)
    {
        $this->mark_abs_hsize = $aSize ;
    }

    public function SetLineWeight($aWeight)
    {
        $this->weight = $aWeight;
    }

    public function SetFrameWeight($aWeight)
    {
        $this->frameweight = $aWeight;
    }

    public function SetLayout($aDirection=LEGEND_VERT)
    {
        $this->layout_n = $aDirection==LEGEND_VERT ? 1 : 99 ;
    }

    public function SetColumns($aCols)
    {
        $this->layout_n = $aCols ;
    }

    public function SetReverse($f=true)
    {
        $this->reverse = $f ;
    }

    // Set color on frame around box
    public function SetColor($aFontColor, $aColor='black')
    {
        $this->font_color=$aFontColor;
        $this->color=$aColor;
    }

    public function SetFont($aFamily, $aStyle=FS_NORMAL, $aSize=10)
    {
        $this->font_family = $aFamily;
        $this->font_style = $aStyle;
        $this->font_size = $aSize;
    }

    public function SetPos($aX, $aY, $aHAlign='right', $aVAlign='top')
    {
        $this->Pos($aX, $aY, $aHAlign, $aVAlign);
    }

    public function SetAbsPos($aX, $aY, $aHAlign='right', $aVAlign='top')
    {
        $this->xabspos=$aX;
        $this->yabspos=$aY;
        $this->halign=$aHAlign;
        $this->valign=$aVAlign;
    }

    public function Pos($aX, $aY, $aHAlign='right', $aVAlign='top')
    {
        if (!($aX<1 && $aY<1)) {
            JpGraphError::RaiseL(25120);//(" Position for legend must be given as percentage in range 0-1");
        }
        $this->xpos=$aX;
        $this->ypos=$aY;
        $this->halign=$aHAlign;
        $this->valign=$aVAlign;
    }

    public function SetFillColor($aColor)
    {
        $this->fill_color=$aColor;
    }

    public function Clear()
    {
        $this->txtcol = array();
    }

    public function Add($aTxt, $aColor, $aPlotmark='', $aLinestyle=0, $csimtarget='', $csimalt='', $csimwintarget='')
    {
        $this->txtcol[]=array($aTxt,$aColor,$aPlotmark,$aLinestyle,$csimtarget,$csimalt,$csimwintarget);
    }

    public function GetCSIMAreas()
    {
        return $this->csimareas;
    }

    public function SetBackgroundGradient($aFrom='navy', $aTo='silver', $aGradType=2)
    {
        $this->bkg_gradtype=$aGradType;
        $this->bkg_gradfrom = $aFrom;
        $this->bkg_gradto = $aTo;
    }

    public function HasItems()
    {
        return (boolean)(count($this->txtcol));
    }

    public function Stroke($aImg)
    {
        // Constant
        $fillBoxFrameWeight=1;

        if ($this->hide) {
            return;
        }

        $aImg->SetFont($this->font_family, $this->font_style, $this->font_size);

        if ($this->reverse) {
            $this->txtcol = array_reverse($this->txtcol);
        }

        $n=count($this->txtcol);
        if ($n == 0) {
            return;
        }

        // Find out the max width and height of each column to be able
        // to size the legend box.
        $numcolumns = ($n > $this->layout_n ? $this->layout_n : $n);
        for ($i=0; $i < $numcolumns; ++$i) {
            $colwidth[$i] = $aImg->GetTextWidth($this->txtcol[$i][0]) +
                            2*$this->xmargin + 2*$this->mark_abs_hsize;
            $colheight[$i] = 0;
        }

        // Find our maximum height in each row
        $rows = 0 ;
        $rowheight[0] = 0;
        for ($i=0; $i < $n; ++$i) {
            $h = max($this->mark_abs_vsize, $aImg->GetTextHeight($this->txtcol[$i][0]))+$this->ylinespacing;

            // Makes sure we always have a minimum of 1/4 (1/2 on each side) of the mark as space
            // between two vertical legend entries
            //$h = round(max($h,$this->mark_abs_vsize+$this->ymargin));
            //echo "Textheight #$i: tetxheight=".$aImg->GetTextHeight($this->txtcol[$i][0]).', ';
            //echo "h=$h ({$this->mark_abs_vsize},{$this->ymargin})<br>";
            if ($i % $numcolumns == 0) {
                $rows++;
                $rowheight[$rows-1] = 0;
            }
            $rowheight[$rows-1] = max($rowheight[$rows-1], $h)+1;
        }

        $abs_height = 0;
        for ($i=0; $i < $rows; ++$i) {
            $abs_height += $rowheight[$i] ;
        }

        // Make sure that the height is at least as high as mark size + ymargin
        $abs_height = max($abs_height, $this->mark_abs_vsize);
        $abs_height += $this->ybottom_margin;

        // Find out the maximum width in each column
        for ($i=$numcolumns; $i < $n; ++$i) {
            $colwidth[$i % $numcolumns] = max(
                $aImg->GetTextWidth($this->txtcol[$i][0])+2*$this->xmargin+2*$this->mark_abs_hsize,
                $colwidth[$i % $numcolumns]
            );
        }

        // Get the total width
        $mtw = 0;
        for ($i=0; $i < $numcolumns; ++$i) {
            $mtw += $colwidth[$i] ;
        }

        // remove the last rows interpace margin (since there is no next row)
        $abs_height -= $this->ylinespacing;


        // Find out maximum width we need for legend box
        $abs_width = $mtw+$this->xlmargin+($numcolumns-1)*$this->mark_abs_hsize;

        if ($this->xabspos === -1  && $this->yabspos === -1) {
            $this->xabspos = $this->xpos*$aImg->width ;
            $this->yabspos = $this->ypos*$aImg->height ;
        }

        // Positioning of the legend box
        if ($this->halign == 'left') {
            $xp = $this->xabspos;
        } elseif ($this->halign == 'center') {
            $xp = $this->xabspos - $abs_width/2;
        } else {
            $xp = $aImg->width - $this->xabspos - $abs_width;
        }

        $yp=$this->yabspos;
        if ($this->valign == 'center') {
            $yp-=$abs_height/2;
        } elseif ($this->valign == 'bottom') {
            $yp-=$abs_height;
        }

        // Stroke legend box
        $aImg->SetColor($this->color);
        $aImg->SetLineWeight($this->frameweight);
        $aImg->SetLineStyle('solid');

        if ($this->shadow) {
            $aImg->ShadowRectangle(
                $xp,
                $yp,
                $xp+$abs_width+$this->shadow_width+2,
                $yp+$abs_height+$this->shadow_width+2,
                $this->fill_color,
                $this->shadow_width+2,
                $this->shadow_color
            );
        } else {
            $aImg->SetColor($this->fill_color);
            $aImg->FilledRectangle($xp, $yp, $xp+$abs_width, $yp+$abs_height);
            $aImg->SetColor($this->color);
            $aImg->Rectangle($xp, $yp, $xp+$abs_width, $yp+$abs_height);
        }

        if ($this->bkg_gradtype >= 0) {
            $grad = new Gradient($aImg);
            $grad->FilledRectangle(
                $xp+1,
                $yp+1,
                $xp+$abs_width-3,
                $yp+$abs_height-3,
                $this->bkg_gradfrom,
                $this->bkg_gradto,
                $this->bkg_gradtype
            );
        }

        // x1,y1 is the position for the legend marker + text
        // The vertical position is the baseline position for the text
        // and every marker is adjusted acording to that.

        // For multiline texts this get more complicated.

        $x1 = $xp + $this->xlmargin;
        $y1 = $yp + $rowheight[0] - $this->ylinespacing + 2 ; // The ymargin is included in rowheight

        // Now, y1 is the bottom vertical position of the first legend, i.e if
        // the legend has multiple lines it is the bottom line.

        $grad = new Gradient($aImg);
        $patternFactory = null;

        // Now stroke each legend in turn
        // Each plot has added the following information to  the legend
        // p[0] = Legend text
        // p[1] = Color,
        // p[2] = For markers a reference to the PlotMark object
        // p[3] = For lines the line style, for gradient the negative gradient style
        // p[4] = CSIM target
        // p[5] = CSIM Alt text
        $i = 1 ;
        $row = 0;
        foreach ($this->txtcol as $p) {

            // STROKE DEBUG BOX
            if (_JPG_DEBUG) {
                $aImg->SetLineWeight(1);
                $aImg->SetColor('red');
                $aImg->SetLineStyle('solid');
                $aImg->Rectangle($x1, $y1, $xp+$abs_width-1, $y1-$rowheight[$row]);
            }

            $aImg->SetLineWeight($this->weight);
            $x1 = round($x1)+1; // We add one to not collide with the border
            $y1=round($y1);

            // This is the center offset up from the baseline which is
            // considered the "center" of the marks. This gets slightly complicated since
            // we need to consider if the text is a multiline paragraph or if it is only
            // a single line. The reason is that for single line the y1 corresponds to the baseline
            // and that is fine. However for a multiline paragraph there is no single baseline
            // and in that case the y1 corresponds to the lowest y for the bounding box. In that
            // case we center the mark in the middle of the paragraph
            if (!preg_match('/\n/', $p[0])) {
                // Single line
                $marky = ceil($y1-$this->mark_abs_vsize/2)-1;
            } else {
                // Paragraph
                $marky = $y1 - $aImg->GetTextHeight($p[0])/2;

                //  echo "y1=$y1, p[o]={$p[0]}, marky=$marky<br>";
            }

            //echo "<br>Mark #$i: marky=$marky<br>";

            $x1 += $this->mark_abs_hsize;
    
            if (!empty($p[2]) && $p[2]->GetType() > -1) {


                // Make a plot mark legend. This is constructed with a mark which
                // is run through with a line

                // First construct a bit of the line that looks exactly like the
                // line in the plot
                $aImg->SetColor($p[1]);
                if (is_string($p[3]) || $p[3]>0) {
                    $aImg->SetLineStyle($p[3]);
                    $aImg->StyleLine($x1-$this->mark_abs_hsize, $marky, $x1+$this->mark_abs_hsize, $marky);
                }

                // Stroke a mark using image
                if ($p[2]->GetType() == MARK_IMG) {
                    $p[2]->Stroke($aImg, $x1, $marky);
                }

                // Stroke a mark with the standard size
                // (As long as it is not an image mark )
                if ($p[2]->GetType() != MARK_IMG) {

                    // Clear any user callbacks since we ont want them called for
                    // the legend marks
                    $p[2]->iFormatCallback = '';
                    $p[2]->iFormatCallback2 = '';

                    // Since size for circles is specified as the radius
                    // this means that we must half the size to make the total
                    // width behave as the other marks
                    if ($p[2]->GetType() == MARK_FILLEDCIRCLE || $p[2]->GetType() == MARK_CIRCLE) {
                        $p[2]->SetSize(min($this->mark_abs_vsize, $this->mark_abs_hsize)/2);
                        $p[2]->Stroke($aImg, $x1, $marky);
                    } else {
                        $p[2]->SetSize(min($this->mark_abs_vsize, $this->mark_abs_hsize));
                        $p[2]->Stroke($aImg, $x1, $marky);
                    }
                }
            } elseif (!empty($p[2]) && (is_string($p[3]) || $p[3]>0)) {
                // Draw a styled line
                $aImg->SetColor($p[1]);
                $aImg->SetLineStyle($p[3]);
                $aImg->StyleLine($x1-$this->mark_abs_hsize, $marky, $x1+$this->mark_abs_hsize, $marky);
                $aImg->StyleLine($x1-$this->mark_abs_hsize, $marky+1, $x1+$this->mark_abs_hsize, $marky+1);
            } else {
                // Draw a colored box
                $color = $p[1] ;

                // We make boxes slightly larger to better show
                $boxsize = max($this->mark_abs_vsize, $this->mark_abs_hsize) + 2 ;

                $ym = $marky-ceil($boxsize/2) ; // Marker y-coordinate

                // We either need to plot a gradient or a
                // pattern. To differentiate we use a kludge.
                // Patterns have a p[3] value of < -100
                if ($p[3] < -100) {
                    // p[1][0] == iPattern, p[1][1] == iPatternColor, p[1][2] == iPatternDensity
                    if ($patternFactory == null) {
                        $patternFactory = new RectPatternFactory();
                    }
                    $prect = $patternFactory->Create($p[1][0], $p[1][1], 1);
                    $prect->SetBackground($p[1][3]);
                    $prect->SetDensity($p[1][2]+1);
                    $prect->SetPos(new Rectangle($x1, $ym, $boxsize, $boxsize));
                    $prect->Stroke($aImg);
                    $prect=null;
                } else {
                    if (is_array($color) && count($color)==2) {
                        // The client want a gradient color
                        $grad->FilledRectangle(
                            $x1-$boxsize/2,
                            $ym,
                            $x1+$boxsize/2,
                            $ym+$boxsize,
                            $color[0],
                            $color[1],
                            -$p[3]
                        );
                    } else {
                        $aImg->SetColor($p[1]);
                        $aImg->FilledRectangle($x1-$boxsize/2, $ym, $x1+$boxsize/2, $ym+$boxsize);
                    }

                    // Draw a plot frame line
                    $aImg->SetColor($this->color);
                    $aImg->SetLineWeight($fillBoxFrameWeight);
                    $aImg->Rectangle(
                        $x1-$boxsize/2,
                        $ym,
                        $x1+$boxsize/2,
                        $ym+$boxsize
                    );
                }
            }
            $aImg->SetColor($this->font_color);
            $aImg->SetFont($this->font_family, $this->font_style, $this->font_size);
            $aImg->SetTextAlign('left', 'baseline');

            $debug=false;
            $aImg->StrokeText(
                $x1+$this->mark_abs_hsize+$this->xmargin,
                $y1,
                $p[0],
                0,
                'left',
                $debug
            );

            // Add CSIM for Legend if defined
            if (!empty($p[4])) {
                $xs = $x1 - $this->mark_abs_hsize ;
                $ys = $y1 + 1 ;
                $xe = $x1 + $aImg->GetTextWidth($p[0]) + $this->mark_abs_hsize + $this->xmargin ;
                $ye = $y1-$rowheight[$row]+1;
                $coords = "$xs,$ys,$xe,$y1,$xe,$ye,$xs,$ye";
                if (! empty($p[4])) {
                    $this->csimareas .= "<area shape=\"poly\" coords=\"$coords\" href=\"".htmlentities($p[4])."\"";

                    if (!empty($p[6])) {
                        $this->csimareas .= " target=\"".$p[6]."\"";
                    }

                    if (!empty($p[5])) {
                        $tmp=sprintf($p[5], $p[0]);
                        $this->csimareas .= " title=\"$tmp\" alt=\"$tmp\" ";
                    }
                    $this->csimareas .= " />\n";
                }
            }

            if ($i >= $this->layout_n) {
                $x1 = $xp+$this->xlmargin;
                $row++;
                if (!empty($rowheight[$row])) {
                    $y1 += $rowheight[$row];
                }
                $i = 1;
            } else {
                $x1 += $colwidth[($i-1) % $numcolumns] ;
                ++$i;
            }
        }
    }
} // Class