gd.php

完美的在线教育系统

<?php
/***********************************************************************
** Title.........:  GD Driver
** Version.......:  1.0
** Author........:  Xiang Wei ZHUO <[e-mail]>
** Filename......:  GD.php
** Last changed..:  30 Aug 2003 
** Notes.........:  Orginal is from PEAR
**/
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Peter Bowyer <[e-mail]>                      |
// |          Alan Knowles <[e-mail]>                            |
// +----------------------------------------------------------------------+
//
//    Usage :
//    $img    = new Image_Transform_GD();
//    $angle  = -78;
//    $img->load('magick.png');
//
//    if($img->rotate($angle,array('autoresize'=>true,'color_mask'=>array(255,0,0)))){
//        $img->addText(array('text'=>"Rotation $angle",'x'=>0,'y'=>100,'font'=>'/usr/share/fonts/default/TrueType/cogb____.ttf'));
//        $img->display();
//    } else {
//        echo "Error";
//    }
//
//
// $Id: GD.php 26 2004-03-31 02:35:21Z Wei Zhuo $
//
// Image Transformation interface using the GD library
//

require_once "Transform.php";

Class Image_Transform_Driver_GD extends Image_Transform
{
    /**
     * Holds the image file for manipulation
     */
    var $imageHandle = '';

    /**
     * Holds the original image file
     */
    var $old_image = '';

    /**
     * Check settings
     *
     * @return mixed true or  or a PEAR error object on error
     *
     * @see PEAR::isError()
     */
    function Image_Transform_GD()
    {
        return;
    } // End function Image

    /**
     * Load image
     *
     * @param string filename
     *
     * @return mixed none or a PEAR error object on error
     * @see PEAR::isError()
     */
    function load($image)
    {
        $this->uid = md5($_SERVER['REMOTE_ADDR']);
        $this->image = $image;
        $this->_get_image_details($image);
        $functionName = 'ImageCreateFrom' . $this->type;
		if(function_exists($functionName))
		{
			$this->imageHandle = $functionName($this->image);
		}
    } // End load

    /**
     * addText
     *
     * @param   array   options     Array contains options
     *                              array(
     *                                  'text'  The string to draw
     *                                  'x'     Horizontal position
     *                                  'y'     Vertical Position
     *                                  'Color' Font color
     *                                  'font'  Font to be used
     *                                  'size'  Size of the fonts in pixel
     *                                  'resize_first'  Tell if the image has to be resized
     *                                                  before drawing the text
     *                              )
     *
     * @return none
     * @see PEAR::isError()
     */
    function addText($params)
    {
        $default_params = array(
                                'text' => 'This is Text',
                                'x' => 10,
                                'y' => 20,
                                'color' => array(255,0,0),
                                'font' => 'Arial.ttf',
                                'size' => '12',
                                'angle' => 0,
                                'resize_first' => false // Carry out the scaling of the image before annotation?  Not used for GD
                                );
        $params = array_merge($default_params, $params);
        extract($params);

        if( !is_array($color) ){
            if ($color[0]=='#'){
                $this->colorhex2colorarray( $color );
            } else {
                include_once('Image/Transform/Driver/ColorsDefs.php');
                $color = isset($colornames[$color])?$colornames[$color]:false;
            }
        }

        $c = imagecolorresolve ($this->imageHandle, $color[0], $color[1], $color[2]);

        if ('ttf' == substr($font, -3)) {
            ImageTTFText($this->imageHandle, $size, $angle, $x, $y, $c, $font, $text);
        } else {
            ImagePSText($this->imageHandle, $size, $angle, $x, $y, $c, $font, $text);
        }
        return true;
    } // End addText


    /**
     * Rotate image by the given angle
     * Uses a fast rotation algorythm for custom angles
     * or lines copy for multiple of 90 degrees
     *
     * @param int       $angle      Rotation angle
     * @param array     $options    array(  'autoresize'=>true|false,
     *                                      'color_mask'=>array(r,g,b), named color or #rrggbb
     *                                   )
     * @author Pierre-Alain Joye
     * @return mixed none or a PEAR error object on error
     * @see PEAR::isError()
     */
    function rotate($angle, $options=null)
    {
        if(function_exists('imagerotate') && false) {
            $white = imagecolorallocate ($this->imageHandle, 255, 255, 255);
			$this->imageHandle = imagerotate($this->imageHandle, $angle, $white);
            return true;
        }

        if ( $options==null ){
            $autoresize = true;
            $color_mask = array(255,255,0);
        } else {
            extract( $options );
        }

        while ($angle <= -45) {
            $angle  += 360;
        }
        while ($angle > 270) {
            $angle  -= 360;
        }

        $t      = deg2rad($angle);

        if( !is_array($color_mask) ){
            if ($color[0]=='#'){
                $this->colorhex2colorarray( $color_mask );
            } else {
                include_once('Image/Transform/Driver/ColorDefs.php');
                $color = isset($colornames[$color_mask])?$colornames[$color_mask]:false;
            }
        }

        // Do not round it, too much lost of quality
        $cosT   = cos($t);
        $sinT   = sin($t);

        $img    =& $this->imageHandle;

        $width  = $max_x  = $this->img_x;
        $height = $max_y  = $this->img_y;
        $min_y  = 0;
        $min_x  = 0;

        $x1     = round($max_x/2,0);
        $y1     = round($max_y/2,0);

        if ( $autoresize ){
            $t      = abs($t);
            $a      = round($angle,0);
            switch((int)($angle)){
                case 0:
                        $width2     = $width;
                        $height2    = $height;
                    break;
                case 90:
                        $width2     = $height;
                        $height2    = $width;
                    break;
                case 180:
                        $width2     = $width;
                        $height2    = $height;
                    break;
                case 270:
                        $width2     = $height;
                        $height2    = $width;
                    break;
                default:
                    $width2     = (int)(abs(sin($t) * $height + cos($t) * $width));
                    $height2    = (int)(abs(cos($t) * $height+sin($t) * $width));
            }

            $width2     -= $width2%2;
            $height2    -= $height2%2;

            $d_width    = abs($width - $width2);
            $d_height   = abs($height - $height2);
            $x_offset   = $d_width/2;
            $y_offset   = $d_height/2;
            $min_x2     = -abs($x_offset);
            $min_y2     = -abs($y_offset);
            $max_x2     = $width2;
            $max_y2     = $height2;
        }

        if(function_exists('ImageCreateTrueColor')){
            $img2 =ImageCreateTrueColor($width2,$height2);
        } else {
            $img2 =ImageCreate($width2,$height2);
        }
	

        if ( !is_resource($img2) ){
            return false;/*PEAR::raiseError('Cannot create buffer for the rotataion.',
                                null, PEAR_ERROR_TRIGGER, E_USER_NOTICE);*/
        }

        $this->img_x = $width2;
        $this->img_y = $height2;