source: trunk/xgraph/jpgraph/Examples/mkgrad.php

<?php // content="text/plain; charset=utf-8"
//=======================================================================
// File:            MKGRAD.PHP
// Description: Simple tool to create a gradient background
// Ver:             $Id$
//=======================================================================

// Basic library classes
require_once ('jpgraph/jpgraph.php');
require_once ('jpgraph/jpgraph_bar.php');
require_once ('jpgraph/jpgraph_canvas.php');
  

// Must have a global comparison method for usort()
function _cmp($a,$b) {
    return strcmp($a,$b);
}

// Generate the input form
class Form {
    var $iColors;
    var $iGradstyles;
    function Form() {

        $rgb = new RGB();
        $this->iColors = array_keys($rgb->rgb_table);
        usort($this->iColors,'_cmp');

        $this->iGradstyles = array(
            "Vertical",2,
            "Horizontal",1,
            "Vertical from middle",3,
            "Horizontal from middle",4,
            "Horizontal wider middle",6,
            "Vertical wider middle",7,
            "Rectangle",5 );
    }

    function Run() {

        echo '<h3>Generate gradient background</h3>';
        echo '<form METHOD=POST action=""><table style="border:blue solid 1;">';
        echo '<tr><td>Width:<br>'.$this->GenHTMLInput('w',8,4,300).'</td>';
        echo "\n";
        echo '<td>Height:<br>'.$this->GenHTMLInput('h',8,4,300).'</td></tr>';
        echo "\n";
        echo '<tr><td>From Color:<br>';
        echo $this->GenHTMLSelect('fc',$this->iColors);
        echo '</td><td>To Color:<br>';
        echo $this->GenHTMLSelect('tc',$this->iColors);
        echo '</td></tr>';
        echo '<tr><td colspan=2>Gradient style:<br>';
        echo $this->GenHTMLSelectCode('s',$this->iGradstyles);
        echo '</td></tr>';
        echo '<tr><td colspan=2>Filename: (empty to stream)<br>';
        echo $this->GenHTMLInput('fn',55,100);
        echo '</td></tr>';
        echo '<tr><td colspan=2 align=right>'.$this->GenHTMLSubmit('submit').'</td></tr>';
        echo '</table>';
        echo '</form>';

    }

    function GenHTMLSubmit($name) {
        return '<INPUT TYPE=submit name="ok"  value=" Ok " >';
    }


    function GenHTMLInput($name,$len,$maxlen=100,$val='') {
        return '<INPUT TYPE=TEXT NAME='.$name.' VALUE="'.$val.'" SIZE='.$len.' MAXLENGTH='.$maxlen.'>';
    }

    function GenHTMLSelect($name,$option,$selected="",$size=0) {
        $txt="<select name=$name";
        if( $size > 0 )
            $txt .= " size=$size >";
        else 
            $txt .= ">";
        for($i=0; $i<count($option); $i++) {
            if( $selected==$option[$i] )
                $txt=$txt."<option selected value=\"$option[$i]\">$option[$i]</option>\n";              
            else
                $txt=$txt."<option value=\"".$option[$i]."\">$option[$i]</option>\n";
        }
        return $txt."</select>\n";
    }
    
    function GenHTMLSelectCode($name,$option,$selected="",$size=0) {
        $txt="<select name=$name";
        if( $size > 0 )
            $txt .= " size=$size >";
        else 
            $txt .= ">";
        for($i=0; $i<count($option); $i += 2) {
            if( $selected==$option[($i+1)] )
                $txt=$txt."<option selected value=".$option[($i+1)].">$option[$i]</option>\n";          
            else
                $txt=$txt."<option value=\"".$option[($i+1)]."\">$option[$i]</option>\n";
        }
        return $txt."</select>\n";
    }

}

// Basic application driver

class Driver {
    var $iGraph, $iGrad;
    var $iWidth,$iHeight;
    var $iFromColor, $iToColor;
    var $iStyle;
    var $iForm;

    function Driver() {
        $this->iForm = new Form();
    }

    function GenGradImage() {
        
        $aWidth  = (int)@$_POST['w'];
        $aHeight = (int)@$_POST['h'];
        $aFrom   = @$_POST['fc'];
        $aTo     = @$_POST['tc'];
        $aStyle  = @$_POST['s'];
        $aFileName  = @$_POST['fn'];

        $this->iWidth     = $aWidth;
        $this->iHeight    = $aHeight;
        $this->iFromColor = $aFrom;
        $this->iToColor   = $aTo;
        $this->iStyle     = $aStyle;

        $this->graph = new CanvasGraph($aWidth,$aHeight);
        $this->grad  = new Gradient($this->graph->img);
        $this->grad->FilledRectangle(0,0,
                                     $this->iWidth,$this->iHeight,
                                     $this->iFromColor,
                                     $this->iToColor,
                                     $this->iStyle);

        if( $aFileName != "" ) {
            $this->graph->Stroke($aFileName);
            echo "Image file '$aFileName' created.";
        }
        else
            $this->graph->Stroke();
    }


    function Run() {
        
        global $HTTP_POST_VARS;

        // Two modes:
        // 1) If the script is called with no posted arguments
        // we show the input form.
        // 2) If we have posted arguments we naivly assume that
        // we are called to do the image.

        if( @$_POST['ok']===' Ok ' ) { 
            $this->GenGradImage();
        }
        else
            $this->iForm->Run();
    }
}

$driver = new Driver();                         
$driver->Run();

?>