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<?php
/*=======================================================================
// File:        JPGRAPH_CANVTOOLS.PHP
// Description: Some utilities for text and shape drawing on a canvas
// Created:     2002-08-23
// Author:      Johan Persson (johanp@aditus.nu)
// Ver:         $Id: jpgraph_canvtools.php,v 1.1 2004/06/15 10:13:19 jpm Exp $
//
// License:     This code is released under QPL
// Copyright (C) 2001,2002 Johan Persson
//========================================================================
*/

DEFINE('CORNER_TOPLEFT',0);
DEFINE('CORNER_TOPRIGHT',1);
DEFINE('CORNER_BOTTOMRIGHT',2);
DEFINE('CORNER_BOTTOMLEFT',3);


//===================================================
// CLASS CanvasScale
// Description: Define a scale for canvas so we
// can abstract away with absolute pixels
//===================================================
 
class CanvasScale {
    var $g;
    var $w,$h;
    var $ixmin=0,$ixmax=10,$iymin=0,$iymax=10;

    function CanvasScale(&$graph,$xmin=0,$xmax=10,$ymin=0,$ymax=10) {
        $this->g = &$graph;
        $this->w = $graph->img->width;
        $this->h = $graph->img->height;
        $this->ixmin = $xmin;
        $this->ixmax = $xmax;
        $this->iymin = $ymin;
        $this->iymax = $ymax;
    }
    
    function Set($xmin=0,$xmax=10,$ymin=0,$ymax=10) {
        $this->ixmin = $xmin;
        $this->ixmax = $xmax;
        $this->iymin = $ymin;
        $this->iymax = $ymax;
    }

    function Translate($x,$y) {
        $xp = round(($x-$this->ixmin)/($this->ixmax - $this->ixmin) * $this->w);
        $yp = round(($y-$this->iymin)/($this->iymax - $this->iymin) * $this->h);
        return array($xp,$yp);
    }

    function TranslateX($x) {
        $xp = round(($x-$this->ixmin)/($this->ixmax - $this->ixmin) * $this->w);
        return $xp;
    }

    function TranslateY($y) {
        $yp = round(($y-$this->iymin)/($this->iymax - $this->iymin) * $this->h);
        return $yp;
    }

}


//===================================================
// CLASS Shape
// Description: Methods to draw shapes on canvas
//===================================================
class Shape {
    var $img,$scale;

    function Shape(&$aGraph,&$scale) {
        $this->img = &$aGraph->img;
        $this->img->SetColor('black');
        $this->scale = &$scale;
    }

    function SetColor($aColor) {
        $this->img->SetColor($aColor);
    }

    function Line($x1,$y1,$x2,$y2) {
        list($x1,$y1) = $this->scale->Translate($x1,$y1);
        list($x2,$y2) = $this->scale->Translate($x2,$y2);
        $this->img->Line($x1,$y1,$x2,$y2);
    }

    function Polygon($p,$aClosed=false) {
        $n=count($p);
        for($i=0; $i < $n; $i+=2 ) {
           $p[$i]   = $this->scale->TranslateX($p[$i]);
           $p[$i+1] = $this->scale->TranslateY($p[$i+1]);
        }
        $this->img->Polygon($p,$aClosed);
    }

    function FilledPolygon($p) {
        $n=count($p);
        for($i=0; $i < $n; $i+=2 ) {
           $p[$i]   = $this->scale->TranslateX($p[$i]);
           $p[$i+1] = $this->scale->TranslateY($p[$i+1]);
        }
        $this->img->FilledPolygon($p);
    }
    

    // Draw a bezier curve with defining points in the $aPnts array
    // using $aSteps steps.
    // 0=x0, 1=y0
    // 2=x1, 3=y1
    // 4=x2, 5=y2
    // 6=x3, 7=y3
    function Bezier($p,$aSteps=40) {
        $x0 = $p[0];
        $y0 = $p[1];
        // Calculate coefficients
        $cx = 3*($p[2]-$p[0]);
        $bx = 3*($p[4]-$p[2])-$cx;
        $ax = $p[6]-$p[0]-$cx-$bx;
        $cy = 3*($p[3]-$p[1]);
        $by = 3*($p[5]-$p[3])-$cy;
        $ay = $p[7]-$p[1]-$cy-$by;

        // Step size
        $delta = 1.0/$aSteps;

        $x_old = $x0;
        $y_old = $y0;
        for($t=$delta; $t<=1.0; $t+=$delta) {
            $tt = $t*$t; $ttt=$tt*$t;
            $x  = $ax*$ttt + $bx*$tt + $cx*$t + $x0;
            $y = $ay*$ttt + $by*$tt + $cy*$t + $y0;
            $this->Line($x_old,$y_old,$x,$y);
            $x_old = $x;
            $y_old = $y;
        }
        $this->Line($x_old,$y_old,$p[6],$p[7]);
    }

    function Rectangle($x1,$y1,$x2,$y2) {
        list($x1,$y1) = $this->scale->Translate($x1,$y1);
        list($x2,$y2)   = $this->scale->Translate($x2,$y2);
        $this->img->Rectangle($x1,$y1,$x2,$y2);
    }

    function FilledRectangle($x1,$y1,$x2,$y2) {
        list($x1,$y1) = $this->scale->Translate($x1,$y1);
        list($x2,$y2)   = $this->scale->Translate($x2,$y2);
        $this->img->FilledRectangle($x1,$y1,$x2,$y2);
    }
    
    function Circle($x1,$y1,$r) {
        list($x1,$y1) = $this->scale->Translate($x1,$y1);
        if( $r >= 0 )
            $r   = $this->scale->TranslateX($r);
        else
            $r = -$r;
        $this->img->Circle($x1,$y1,$r);
    }

    function FilledCircle($x1,$y1,$r) {
        list($x1,$y1) = $this->scale->Translate($x1,$y1);
        if( $r >= 0 )
            $r   = $this->scale->TranslateX($r);
        else
            $r = -$r;
        $this->img->FilledCircle($x1,$y1,$r);
    }

    function RoundedRectangle($x1,$y1,$x2,$y2,$r=null) {    
        list($x1,$y1) = $this->scale->Translate($x1,$y1);
        list($x2,$y2)   = $this->scale->Translate($x2,$y2);

        if( $r == null )
            $r = 5;
        elseif( $r >= 0 )
            $r = $this->scale->TranslateX($r);
        else
            $r = -$r;
        $this->img->RoundedRectangle($x1,$y1,$x2,$y2,$r);
    }

    function FilledRoundedRectangle($x1,$y1,$x2,$y2,$r=null) {    
        list($x1,$y1) = $this->scale->Translate($x1,$y1);
        list($x2,$y2)   = $this->scale->Translate($x2,$y2);

        if( $r == null )
            $r = 5;
        elseif( $r > 0 )
            $r = $this->scale->TranslateX($r);
        else
            $r = -$r;
        $this->img->FilledRoundedRectangle($x1,$y1,$x2,$y2,$r);    
    }

    function ShadowRectangle($x1,$y1,$x2,$y2,$fcolor=false,$shadow_width=null,$shadow_color=array(102,102,102)) {
        list($x1,$y1) = $this->scale->Translate($x1,$y1);
        list($x2,$y2) = $this->scale->Translate($x2,$y2);
        if( $shadow_width == null ) 
            $shadow_width=4;
        else
            $shadow_width=$this->scale->TranslateX($shadow_width);
        $this->img->ShadowRectangle($x1,$y1,$x2,$y2,$fcolor,$shadow_width,$shadow_color);
    }

    function SetTextAlign($halign,$valign="bottom") {
        $this->img->SetTextAlign($halign,$valign="bottom");
    }

    function StrokeText($x1,$y1,$txt,$dir=0,$paragraph_align="left") {
        list($x1,$y1) = $this->scale->Translate($x1,$y1);
        $this->img->StrokeText($x1,$y1,$txt,$dir,$paragraph_align);
    }

    // A rounded rectangle where one of the corner has been moved "into" the
    // rectangle 'iw' width and 'ih' height. Corners:
    // 0=Top left, 1=top right, 2=bottom right, 3=bottom left
    function IndentedRectangle($xt,$yt,$w,$h,$iw=0,$ih=0,$aCorner=3,$aFillColor="",$r=4) {
    
        list($xt,$yt) = $this->scale->Translate($xt,$yt);
        list($w,$h)   = $this->scale->Translate($w,$h);
        list($iw,$ih) = $this->scale->Translate($iw,$ih);
        
        $xr = $xt + $w - 0;
        $yl = $yt + $h - 0;

        switch( $aCorner ) {
            case 0: // Upper left
            
                // Bottom line, left &  right arc
                $this->img->Line($xt+$r,$yl,$xr-$r,$yl);
                $this->img->Arc($xt+$r,$yl-$r,$r*2,$r*2,90,180);
                $this->img->Arc($xr-$r,$yl-$r,$r*2,$r*2,0,90);

                // Right line, Top right arc
                $this->img->Line($xr,$yt+$r,$xr,$yl-$r);
                $this->img->Arc($xr-$r,$yt+$r,$r*2,$r*2,270,360);

                // Top line, Top left arc
                $this->img->Line($xt+$iw+$r,$yt,$xr-$r,$yt);
                $this->img->Arc($xt+$iw+$r,$yt+$r,$r*2,$r*2,180,270);

                // Left line
                $this->img->Line($xt,$yt+$ih+$r,$xt,$yl-$r);

                // Indent horizontal, Lower left arc
                $this->img->Line($xt+$r,$yt+$ih,$xt+$iw-$r,$yt+$ih);
                $this->img->Arc($xt+$r,$yt+$ih+$r,$r*2,$r*2,180,270);

                // Indent vertical, Indent arc
                $this->img->Line($xt+$iw,$yt+$r,$xt+$iw,$yt+$ih-$r);
                $this->img->Arc($xt+$iw-$r,$yt+$ih-$r,$r*2,$r*2,0,90);

                if( $aFillColor != '' ) {
                    $bc = $this->img->current_color_name;
                    $this->img->PushColor($aFillColor);
                    $this->img->FillToBorder($xr-$r,$yl-$r,$bc);
                    $this->img->PopColor();
                }

                break;

            case 1: // Upper right

                // Bottom line, left &  right arc
                $this->img->Line($xt+$r,$yl,$xr-$r,$yl);
                $this->img->Arc($xt+$r,$yl-$r,$r*2,$r*2,90,180);
                $this->img->Arc($xr-$r,$yl-$r,$r*2,$r*2,0,90);

                // Left line, Top left arc
                $this->img->Line($xt,$yt+$r,$xt,$yl-$r);
                $this->img->Arc($xt+$r,$yt+$r,$r*2,$r*2,180,270);

                // Top line, Top right arc
                $this->img->Line($xt+$r,$yt,$xr-$iw-$r,$yt);
                $this->img->Arc($xr-$iw-$r,$yt+$r,$r*2,$r*2,270,360);

                // Right line
                $this->img->Line($xr,$yt+$ih+$r,$xr,$yl-$r);

                // Indent horizontal, Lower right arc
                $this->img->Line($xr-$iw+$r,$yt+$ih,$xr-$r,$yt+$ih);
                $this->img->Arc($xr-$r,$yt+$ih+$r,$r*2,$r*2,270,360);

                // Indent vertical, Indent arc
                $this->img->Line($xr-$iw,$yt+$r,$xr-$iw,$yt+$ih-$r);
                $this->img->Arc($xr-$iw+$r,$yt+$ih-$r,$r*2,$r*2,90,180);

                if( $aFillColor != '' ) {
                    $bc = $this->img->current_color_name;
                    $this->img->PushColor($aFillColor);
                    $this->img->FillToBorder($xt+$r,$yl-$r,$bc);
                    $this->img->PopColor();
                }

                break;

            case 2: // Lower right
                // Top line, Top left & Top right arc
                $this->img->Line($xt+$r,$yt,$xr-$r,$yt);
                $this->img->Arc($xt+$r,$yt+$r,$r*2,$r*2,180,270);
                $this->img->Arc($xr-$r,$yt+$r,$r*2,$r*2,270,360);

                // Left line, Bottom left arc
                $this->img->Line($xt,$yt+$r,$xt,$yl-$r);
                $this->img->Arc($xt+$r,$yl-$r,$r*2,$r*2,90,180);

                // Bottom line, Bottom right arc
                $this->img->Line($xt+$r,$yl,$xr-$iw-$r,$yl);
                $this->img->Arc($xr-$iw-$r,$yl-$r,$r*2,$r*2,0,90);

                // Right line
                $this->img->Line($xr,$yt+$r,$xr,$yl-$ih-$r);
            
                // Indent horizontal, Lower right arc
                $this->img->Line($xr-$r,$yl-$ih,$xr-$iw+$r,$yl-$ih);
                $this->img->Arc($xr-$r,$yl-$ih-$r,$r*2,$r*2,0,90);

                // Indent vertical, Indent arc
                $this->img->Line($xr-$iw,$yl-$r,$xr-$iw,$yl-$ih+$r);
                $this->img->Arc($xr-$iw+$r,$yl-$ih+$r,$r*2,$r*2,180,270);

                if( $aFillColor != '' ) {
                    $bc = $this->img->current_color_name;
                    $this->img->PushColor($aFillColor);
                    $this->img->FillToBorder($xt+$r,$yt+$r,$bc);
                    $this->img->PopColor();
                }

                break;

            case 3: // Lower left
                // Top line, Top left & Top right arc
                $this->img->Line($xt+$r,$yt,$xr-$r,$yt);
                $this->img->Arc($xt+$r,$yt+$r,$r*2,$r*2,180,270);
                $this->img->Arc($xr-$r,$yt+$r,$r*2,$r*2,270,360);

                // Right line, Bottom right arc
                $this->img->Line($xr,$yt+$r,$xr,$yl-$r);
                $this->img->Arc($xr-$r,$yl-$r,$r*2,$r*2,0,90);

                // Bottom line, Bottom left arc
                $this->img->Line($xt+$iw+$r,$yl,$xr-$r,$yl);
                $this->img->Arc($xt+$iw+$r,$yl-$r,$r*2,$r*2,90,180);

                // Left line
                $this->img->Line($xt,$yt+$r,$xt,$yl-$ih-$r);
            
                // Indent horizontal, Lower left arc
                $this->img->Line($xt+$r,$yl-$ih,$xt+$iw-$r,$yl-$ih);
                $this->img->Arc($xt+$r,$yl-$ih-$r,$r*2,$r*2,90,180);

                // Indent vertical, Indent arc
                $this->img->Line($xt+$iw,$yl-$ih+$r,$xt+$iw,$yl-$r);
                $this->img->Arc($xt+$iw-$r,$yl-$ih+$r,$r*2,$r*2,270,360);

                if( $aFillColor != '' ) {
                    $bc = $this->img->current_color_name;
                    $this->img->PushColor($aFillColor);
                    $this->img->FillToBorder($xr-$r,$yt+$r,$bc);
                    $this->img->PopColor();
                }

                break;
        }
    }
}


//===================================================
// CLASS RectangleText
// Description: Draws a text paragraph inside a 
// rounded, possible filled, rectangle.
//===================================================
class CanvasRectangleText {
    var $ix,$iy,$iw,$ih,$ir=4;
    var $iTxt,$iColor='black',$iFillColor='',$iFontColor='black';
    var $iParaAlign='center';
    var $iAutoBoxMargin=5;
    var $iShadowWidth=3,$iShadowColor='';

    function CanvasRectangleText($aTxt='',$xl=0,$yt=0,$w=0,$h=0) {
        $this->iTxt = new Text($aTxt);
        $this->ix = $xl;
        $this->iy = $yt;
        $this->iw = $w;
        $this->ih = $h;
    }
 
    function SetShadow($aColor='gray',$aWidth=3) {
        $this->iShadowColor = $aColor;
        $this->iShadowWidth = $aWidth;
    }

    function SetFont($FontFam,$aFontStyle,$aFontSize=12) {
        $this->iTxt->SetFont($FontFam,$aFontStyle,$aFontSize);
    }

    function SetTxt($aTxt) {
        $this->iTxt->Set($aTxt);
    }

    function ParagraphAlign($aParaAlign) {
        $this->iParaAlign = $aParaAlign;
    }

    function SetFillColor($aFillColor) {
        $this->iFillColor = $aFillColor;
    }

    function SetAutoMargin($aMargin) {
        $this->iAutoBoxMargin=$aMargin;
    }

    function SetColor($aColor) {
        $this->iColor = $aColor;
    }

    function SetFontColor($aColor) {
        $this->iFontColor = $aColor;
    }

    function SetPos($xl=0,$yt=0,$w=0,$h=0) {
        $this->ix = $xl;
        $this->iy = $yt;
        $this->iw = $w;
        $this->ih = $h;
    }

    function Pos($xl=0,$yt=0,$w=0,$h=0) {
        $this->ix = $xl;
        $this->iy = $yt;
        $this->iw = $w;
        $this->ih = $h;
    }

    function Set($aTxt,$xl,$yt,$w=0,$h=0) {
        $this->iTxt->Set($aTxt);
        $this->ix = $xl;
        $this->iy = $yt;
        $this->iw = $w;
        $this->ih = $h;
    }

    function SetCornerRadius($aRad=5) {
        $this->ir = $aRad;
    }

    function Stroke($aImg,$scale) {
        
        // If coordinates are specifed as negative this means we should
        // treat them as abolsute (pixels) coordinates
        if( $this->ix > 0 ) {
            $this->ix = $scale->TranslateX($this->ix) ;
        }
        else {
            $this->ix = -$this->ix;
        }

        if( $this->iy > 0 ) {
            $this->iy = $scale->TranslateY($this->iy) ;
        }
        else {
            $this->iy = -$this->iy;
        }
            
        list($this->iw,$this->ih) = $scale->Translate($this->iw,$this->ih) ;

        if( $this->iw == 0 ) 
            $this->iw = round($this->iTxt->GetWidth($aImg) + $this->iAutoBoxMargin);
        if( $this->ih == 0 ) {
            $this->ih = round($this->iTxt->GetTextHeight($aImg) + $this->iAutoBoxMargin);
        }

        if( $this->iShadowColor != '' ) {
            $aImg->PushColor($this->iShadowColor);
            $aImg->FilledRoundedRectangle($this->ix+$this->iShadowWidth,
                                          $this->iy+$this->iShadowWidth,
                                          $this->ix+$this->iw-1+$this->iShadowWidth,
                                          $this->iy+$this->ih-1+$this->iShadowWidth,
                                          $this->ir);
            $aImg->PopColor();      
        }

        if( $this->iFillColor != '' ) {
            $aImg->PushColor($this->iFillColor);
            $aImg->FilledRoundedRectangle($this->ix,$this->iy,
                                          $this->ix+$this->iw-1,
                                          $this->iy+$this->ih-1,
                                          $this->ir);
            $aImg->PopColor();
        }

        if( $this->iColor != '' ) {
            $aImg->PushColor($this->iColor);
            $aImg->RoundedRectangle($this->ix,$this->iy,
                                    $this->ix+$this->iw-1,
                                    $this->iy+$this->ih-1,
                                    $this->ir);
            $aImg->PopColor();
        }
        
        $this->iTxt->Align('center','center');
        $this->iTxt->ParagraphAlign($this->iParaAlign);
        $this->iTxt->SetColor($this->iFontColor);
        $this->iTxt->Stroke($aImg, $this->ix+$this->iw/2, $this->iy+$this->ih/2);

        return array($this->iw, $this->ih);

    }

}


?>