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<?php
/*=======================================================================
// File:        JPGRAPH_CANVAS.PHP
// Description: Canvas drawing extension for JpGraph
// Created:     2001-01-08
// Ver:         $Id: jpgraph_canvas.php 782 2006-10-08 08:09:02Z ljp $
//
// Copyright (c) Aditus Consulting. All rights reserved.
//========================================================================
*/

//===================================================
// CLASS CanvasGraph
// Description: Creates a simple canvas graph which
// might be used together with the basic Image drawing
// primitives. Useful to auickoly produce some arbitrary
// graphic which benefits from all the functionality in the
// graph liek caching for example. 
//===================================================
class CanvasGraph extends Graph {
//---------------
// CONSTRUCTOR
    function CanvasGraph($aWidth=300,$aHeight=200,$aCachedName="",$timeout=0,$inline=1) {
        $this->Graph($aWidth,$aHeight,$aCachedName,$timeout,$inline);
    }

//---------------
// PUBLIC METHODS       

    function InitFrame() {
        $this->StrokePlotArea();
    }

    // Method description
    function Stroke($aStrokeFileName="") {
        if( $this->texts != null ) {
            for($i=0; $i < count($this->texts); ++$i) {
                $this->texts[$i]->Stroke($this->img);
            }
        }               
        if( $this->iTables !== null ) {
            for($i=0; $i < count($this->iTables); ++$i) {
                $this->iTables[$i]->Stroke($this->img);
            }   
        }
        $this->StrokeTitles();

        // If the filename is the predefined value = '_csim_special_'
        // we assume that the call to stroke only needs to do enough
        // to correctly generate the CSIM maps.
        // We use this variable to skip things we don't strictly need
        // to do to generate the image map to improve performance
        // a best we can. Therefor you will see a lot of tests !$_csim in the
        // code below.
        $_csim = ($aStrokeFileName===_CSIM_SPECIALFILE);

        // We need to know if we have stroked the plot in the
        // GetCSIMareas. Otherwise the CSIM hasn't been generated
        // and in the case of GetCSIM called before stroke to generate
        // CSIM without storing an image to disk GetCSIM must call Stroke.
        $this->iHasStroked = true;

        if( !$_csim ) {

            // Should we do any final image transformation
            if( $this->iImgTrans ) {
                if( !class_exists('ImgTrans') ) {
                    require_once('jpgraph_imgtrans.php');
                }
            
                $tform = new ImgTrans($this->img->img);
                $this->img->img = $tform->Skew3D($this->iImgTransHorizon,$this->iImgTransSkewDist,
                                                 $this->iImgTransDirection,$this->iImgTransHighQ,
                                                 $this->iImgTransMinSize,$this->iImgTransFillColor,
                                                 $this->iImgTransBorder);
            }
        

            // If the filename is given as the special _IMG_HANDLER
            // then the image handler is returned and the image is NOT
            // streamed back
            if( $aStrokeFileName == _IMG_HANDLER ) {
                return $this->img->img;
            }
            else {
                // Finally stream the generated picture                                 
                $this->cache->PutAndStream($this->img,$this->cache_name,$this->inline,$aStrokeFileName);
                return true;
            }
        }
    }
} // Class
/* EOF */
?>