extend/alipay/pay/lotusphp_runtime/Captcha/CaptchaImageEngine.php

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<?php
/**
 * Lotus Captcha component is inspired by "cool-php-captcha" project
 * http://code.google.com/p/cool-php-captcha
 */
class LtCaptchaImageEngine
{
	public $conf;

    protected $maxWordLength = 9;

    /**
     * * Background color in RGB-array
     */
    protected $backgroundColor = array(255, 255, 255);

    /**
     * * Foreground colors in RGB-array
     */
    protected $colors = array(
        array(27, 78, 181), // blue
        array(22, 163, 35), // green
        array(214, 36, 7), // red
        );

    /**
     * * Shadow color in RGB-array or null
     */
    protected $shadowColor = null; //array(0, 0, 0);
    
    /**
     * Font configuration
     * 
     * - font: TTF file
     * - spacing: relative pixel space between character
     * - minSize: min font size
     * - maxSize: max font size
     */
    protected $fonts = array('Antykwa' => array('spacing' => -3, 'minSize' => 27, 'maxSize' => 30, 'font' => 'AntykwaBold.ttf'),
        'Candice' => array('spacing' => -1.5, 'minSize' => 28, 'maxSize' => 31, 'font' => 'Candice.ttf'),
        'DingDong' => array('spacing' => -2, 'minSize' => 24, 'maxSize' => 30, 'font' => 'Ding-DongDaddyO.ttf'),
        'Duality' => array('spacing' => -2, 'minSize' => 30, 'maxSize' => 38, 'font' => 'Duality.ttf'),
        'Jura' => array('spacing' => -2, 'minSize' => 28, 'maxSize' => 32, 'font' => 'Jura.ttf'),
        'StayPuft' => array('spacing' => -1.5, 'minSize' => 28, 'maxSize' => 32, 'font' => 'StayPuft.ttf'),
        'Times' => array('spacing' => -2, 'minSize' => 28, 'maxSize' => 34, 'font' => 'TimesNewRomanBold.ttf'),
        'VeraSans' => array('spacing' => -1, 'minSize' => 20, 'maxSize' => 28, 'font' => 'VeraSansBold.ttf'),
        );

    /**
     * * Wave configuracion in X and Y axes
     */
    protected $Yperiod = 12;
    protected $Yamplitude = 14;
    protected $Xperiod = 11;
    protected $Xamplitude = 5;

    /**
     * * GD image
     */
    protected $im;