PHP使用GIFEncoder类生成gif动态滚动字幕


Posted in PHP onJuly 01, 2014

今天在公司,经理让做一个滚动字幕。但是,不许生成gif图片。所以上网找了GIFEncoder这个类库。确实很好用,但是,应用过程中也出现了一些问题,现在写在这里,以供后来人参考,少走弯路。

文字滚动分为两种情况。第一种为水平滚动:

<?php

require_once("GIFEncoder.class.php");

$count=0;   //设置默认计数器

while(true){

    $str = $_REQUEST['str'] ? $_REQUEST['str']:"暂无输入";

    $length=strlen($str)*9;     //计算行长度,这个计算的比较简单,就是每个字数*9个像素

    $im=imagecreatefromgif("hudongbg.gif");     //根据图片创建图像

    $white = ImageColorAllocate($im,255,255,255);       //设置一个白色

    $str = iconv("GB2312","UTF-8",$str);        //特别注意的是转换编码,因为之后用到的imagettftext只能用utf-8编码

    $now=220-$count*5;      //当前运行的水平位置

    imagettftext($im,13,0,$now,20,$white,"ziti.ttf",$str);      //根据字体在图片上写文字,参数意思(图像源,文字大小,倾斜角度,水平位置,垂直位置,颜色,使用的字体文件,要写的内容

    imagegif($im);      

    imagedestroy($im);

    $imagedata[] = ob_get_contents();       //创建这一帧的图像数据

    ob_clean();

    $count++;

    if ($now+$length<0){    //如果最后一个文字移动到头,那么结束

        break;

    }

}

$diy[]=0;//开始延迟时间

$gif = new GIFEncoder($imagedata,$diy,0,2,0,0,0,"bin");

ob_start();

Header ('Content-type:image/gif');

echo $gif->GetAnimation();

?>

然后是垂直的:
<?php

/*

从url获得"str=第一行;第二行;第三行"的数据

*/

require_once("GIFEncoder.class.php");

$array_str=array();

$str=$_GET['str'];

/*

将$str转化成数组

*/

if ($str!=''){

    $array_str=explode(";",$str);

}else{

    $array_str=array("欢迎您光临本店!");

}

/*

如果数组元素没有值,清除最后一个“;”

*/

foreach( $array_str as $k=>$v){

    if( !$v )

    unset( $array_str[$k] );

}

for ($i=0,$length=count($array_str);$i<$length;$i++){

    for ($k=0;$k<20;$k++){

        $im=imagecreatefromgif("hudongbg.gif");     //根据图片创建图像

        $white = ImageColorAllocate($im,255,255,255);       //设置一个白色

        $test = iconv("GB2312","UTF-8",$array_str[$i]);     //特别注意的是转换编码,因为之后用到的imagettftext只能用utf-8编码,注意,一定要用字符串接收,不能用数组,否则会乱码

        $heigth=40-$k;        //当前文字高度

        imagettftext($im,13,0,0,$heigth,$white,"ziti.ttf",$test);        //将文字写入图片

        imagegif($im);

        $imagedata[] = ob_get_contents();

        ob_clean();

    }

}

/*

这里是设置每一张图片的延迟时间,到第20帧的时候,延迟2秒。这样才能出现文字走到顶,停顿一会的效果

*/

$delay=array();

for ($i=1,$length=count($array_str)*20;$i<=$length;$i++){

    if ($i%20==0){

        $delay[$i-1]="200";

    }else{

        $delay[$i-1]="1";

    }

}

$transparent=array(0);

$gif = new GIFEncoder($imagedata,$delay,0,2,0,0,$transparent,"bin");

ob_start();

Header ('Content-type:image/gif');

echo $gif->GetAnimation();

?>

 GIFEncoder类源码:
 

 <?php

Class GIFEncoder {

    var $GIF = "GIF89a";                /* GIF header 6 bytes        */

    var $VER = "GIFEncoder V2.06";        /* Encoder version                */

    var $BUF = Array ( );

    var $LOP =  0;

    var $DIS =  2;

    var $COL = -1;

    var $IMG = -1;

    var $ERR = Array (

    'ERR00' =>"Does not supported function for only one image!",

    'ERR01' =>"Source is not a GIF image!",

    'ERR02' =>"Unintelligible flag ",

    'ERR03' =>"Could not make animation from animated GIF source",

    );

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFEncoder...

    ::

    */

    function GIFEncoder        (

    $GIF_src, $GIF_dly, $GIF_lop, $GIF_dis,

    $GIF_red, $GIF_grn, $GIF_blu, $GIF_mod

    ) {

        if ( ! is_array ( $GIF_src ) && ! is_array ( $GIF_tim ) ) {

            printf        ( "%s: %s", $this->VER, $this->ERR [ 'ERR00' ] );

            exit        ( 0 );

        }

        $this->LOP = ( $GIF_lop > -1 ) ? $GIF_lop : 0;

        $this->DIS = ( $GIF_dis > -1 ) ? ( ( $GIF_dis < 3 ) ? $GIF_dis : 3 ) : 2;

        $this->COL = ( $GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1 ) ?

        ( $GIF_red | ( $GIF_grn << 8 ) | ( $GIF_blu << 16 ) ) : -1;

        for ( $i = 0; $i < count ( $GIF_src ); $i++ ) {

            if ( strToLower ( $GIF_mod ) == "url" ) {

                $this->BUF [ ] = fread ( fopen ( $GIF_src [ $i ], "rb" ), filesize ( $GIF_src [ $i ] ) );

            }

            else if ( strToLower ( $GIF_mod ) == "bin" ) {

                $this->BUF [ ] = $GIF_src [ $i ];

            }

            else {

                printf        ( "%s: %s ( %s )!", $this->VER, $this->ERR [ 'ERR02' ], $GIF_mod );

                exit        ( 0 );

            }

            if ( substr ( $this->BUF [ $i ], 0, 6 ) != "GIF87a" && substr ( $this->BUF [ $i ], 0, 6 ) != "GIF89a" ) {

                printf        ( "%s: %d %s", $this->VER, $i, $this->ERR [ 'ERR01' ] );

                exit        ( 0 );

            }

            for ( $j = ( 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) ), $k = TRUE; $k; $j++ ) {

                switch ( $this->BUF [ $i ] { $j } ) {

                    case "!":

                        if ( ( substr ( $this->BUF [ $i ], ( $j + 3 ), 8 ) ) == "NETSCAPE" ) {

                            printf        ( "%s: %s ( %s source )!", $this->VER, $this->ERR [ 'ERR03' ], ( $i + 1 ) );

                            exit        ( 0 );

                        }

                        break;

                    case ";":

                        $k = FALSE;

                        break;

                }

            }

        }

        GIFEncoder::GIFAddHeader ( );

        for ( $i = 0; $i < count ( $this->BUF ); $i++ ) {

            GIFEncoder::GIFAddFrames ( $i, $GIF_dly [ $i ] );

        }

        GIFEncoder::GIFAddFooter ( );

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFAddHeader...

    ::

    */

    function GIFAddHeader ( ) {

        $cmap = 0;

        if ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x80 ) {

            $cmap = 3 * ( 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ) );

            $this->GIF .= substr ( $this->BUF [ 0 ], 6, 7                );

            $this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap        );

            $this->GIF .= "!/377/13NETSCAPE2.0/3/1" . GIFEncoder::GIFWord ( $this->LOP ) . "/0";

        }

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFAddFrames...

    ::

    */

    function GIFAddFrames ( $i, $d ) {

        $Locals_str = 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) );

        $Locals_end = strlen ( $this->BUF [ $i ] ) - $Locals_str - 1;

        $Locals_tmp = substr ( $this->BUF [ $i ], $Locals_str, $Locals_end );

        $Global_len = 2 << ( ord ( $this->BUF [ 0  ] { 10 } ) & 0x07 );

        $Locals_len = 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );

        $Global_rgb = substr ( $this->BUF [ 0  ], 13,

        3 * ( 2 << ( ord ( $this->BUF [ 0  ] { 10 } ) & 0x07 ) ) );

        $Locals_rgb = substr ( $this->BUF [ $i ], 13,

        3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) );

        $Locals_ext = "!/xF9/x04" . chr ( ( $this->DIS << 2 ) + 0 ) .

        chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . "/x0/x0";

        if ( $this->COL > -1 && ord ( $this->BUF [ $i ] { 10 } ) & 0x80 ) {

            for ( $j = 0; $j < ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ); $j++ ) {

                if        (

                ord ( $Locals_rgb { 3 * $j + 0 } ) == ( $this->COL >>  0 ) & 0xFF &

                ord ( $Locals_rgb { 3 * $j + 1 } ) == ( $this->COL >>  8 ) & 0xFF &

                ord ( $Locals_rgb { 3 * $j + 2 } ) == ( $this->COL >> 16 ) & 0xFF

                ) {

                    $Locals_ext = "!/xF9/x04" . chr ( ( $this->DIS << 2 ) + 1 ) .

                    chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . chr ( $j ) . "/x0";

                    break;

                }

            }

        }

        switch ( $Locals_tmp { 0 } ) {

            case "!":

                $Locals_img = substr ( $Locals_tmp, 8, 10 );

                $Locals_tmp = substr ( $Locals_tmp, 18, strlen ( $Locals_tmp ) - 18 );

                break;

            case ",":

                $Locals_img = substr ( $Locals_tmp, 0, 10 );

                $Locals_tmp = substr ( $Locals_tmp, 10, strlen ( $Locals_tmp ) - 10 );

                break;

        }

        if ( ord ( $this->BUF [ $i ] { 10 } ) & 0x80 && $this->IMG > -1 ) {

            if ( $Global_len == $Locals_len ) {

                if ( GIFEncoder::GIFBlockCompare ( $Global_rgb, $Locals_rgb, $Global_len ) ) {

                    $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );

                }

                else {

                    $byte  = ord ( $Locals_img { 9 } );

                    $byte |= 0x80;

                    $byte &= 0xF8;

                    $byte |= ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 );

                    $Locals_img { 9 } = chr ( $byte );

                    $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );

                }

            }

            else {

                $byte  = ord ( $Locals_img { 9 } );

                $byte |= 0x80;

                $byte &= 0xF8;

                $byte |= ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );

                $Locals_img { 9 } = chr ( $byte );

                $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );

            }

        }

        else {

            $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );

        }

        $this->IMG  = 1;

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFAddFooter...

    ::

    */

    function GIFAddFooter ( ) {

        $this->GIF .= ";";

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFBlockCompare...

    ::

    */

    function GIFBlockCompare ( $GlobalBlock, $LocalBlock, $Len ) {

        for ( $i = 0; $i < $Len; $i++ ) {

            if        (

            $GlobalBlock { 3 * $i + 0 } != $LocalBlock { 3 * $i + 0 } ||

            $GlobalBlock { 3 * $i + 1 } != $LocalBlock { 3 * $i + 1 } ||

            $GlobalBlock { 3 * $i + 2 } != $LocalBlock { 3 * $i + 2 }

            ) {

                return ( 0 );

            }

        }

        return ( 1 );

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFWord...

    ::

    */

    function GIFWord ( $int ) {

        return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) );

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GetAnimation...

    ::

    */

    function GetAnimation ( ) {

        return ( $this->GIF );

    }

}

?>

 
PHP 相关文章推荐
基于数据库的在线人数,日访问量等统计
Oct 09 PHP
介绍几个array库的新函数 php
Dec 29 PHP
PHP中通过ADO调用Access数据库的方法测试不通过
Dec 31 PHP
php数据入库前清理 注意php intval与mysql的int取值范围不同
Dec 12 PHP
Zend Framework中的简单工厂模式 图文
Jul 10 PHP
php日期转时间戳,指定日期转换成时间戳
Jul 17 PHP
php实现执行某一操作时弹出确认、取消对话框
Dec 30 PHP
PHP生成随机密码方法汇总
Aug 27 PHP
PHPWind9.0手动屏蔽验证码解决后台关闭验证码但是依然显示的问题
Aug 12 PHP
PHP实现git部署的方法教程
Dec 19 PHP
php ajax confirm 删除实例详解
Mar 06 PHP
PHP7.3.10编译安装教程
Oct 08 PHP
PHP使用GIFEncoder类生成的GIF动态图片验证码
Jul 01 #PHP
ThinkPHP模板范围判断输出In标签与Range标签用法详解
Jun 30 #PHP
ThinkPHP模板判断输出Empty标签用法详解
Jun 30 #PHP
ThinkPHP模板判断输出Defined标签用法详解
Jun 30 #PHP
ThinkPHP模板判断输出Present标签用法详解
Jun 30 #PHP
ThinkPHP模板比较标签用法详解
Jun 30 #PHP
ThinkPHP模板Switch标签用法示例
Jun 30 #PHP
You might like
目录,文件操作详谈―PHP
2006/11/25 PHP
PHP 替换模板变量实现步骤
2009/08/24 PHP
PHP调用VC编写的COM组件实例
2014/03/29 PHP
PHP获取浏览器信息类和客户端地理位置的2个方法
2014/04/24 PHP
PHP命名空间(namespace)的使用基础及示例
2014/08/18 PHP
PHP实现模拟http请求的方法分析
2017/12/20 PHP
TP5框架实现自定义分页样式的方法示例
2020/04/05 PHP
asp批量修改记录的代码
2008/06/25 Javascript
Jquery通过Ajax访问XML数据的小例子
2013/11/18 Javascript
easyui datagrid 键盘上下控制选中行示例
2014/03/31 Javascript
详解JavaScript基于面向对象之继承实例
2015/12/16 Javascript
Laravel中常见的错误与解决方法小结
2016/08/30 Javascript
JS 获取HTML标签内的子节点的方法
2016/09/21 Javascript
node.js 发布订阅模式的实例
2017/09/10 Javascript
Vuejs在v-for中,利用index来对第一项添加class的方法
2018/03/03 Javascript
JS与CSS3实现图片响应鼠标移动放大效果示例
2018/05/04 Javascript
vue2中使用sass并配置全局的sass样式变量的方法
2018/09/04 Javascript
关于layui flow loading占位图的实现方法
2019/09/21 Javascript
Vue组件模板的几种书写形式(3种)
2020/02/19 Javascript
浅谈JavaScript窗体Window.ShowModalDialog使用
2020/07/22 Javascript
再谈Python中的字符串与字符编码(推荐)
2016/12/14 Python
python爬取淘宝商品销量信息
2018/11/16 Python
python根据时间获取周数代码实例
2019/09/30 Python
套娃式文件夹如何通过Python批量处理
2020/08/23 Python
python Cartopy的基础使用详解
2020/11/01 Python
通过一张图教会你CSS3倒影的实现
2017/09/26 HTML / CSS
阿联酋团购网站:Groupon阿联酋
2016/10/14 全球购物
英国领先的在线药房:Pharmacy First
2017/09/10 全球购物
世界上最受欢迎的钓鱼诱饵:Rapala
2019/05/02 全球购物
英国泽西岛植物:Jersey Plants Direct
2019/08/07 全球购物
软件缺陷的分类都有哪些
2014/08/22 面试题
高中自我评价范文
2014/01/27 职场文书
党员学习中共十八大思想报告
2014/09/12 职场文书
2014年班级工作总结
2014/11/14 职场文书
Win11无法访问设备和打印机 如何解决页面空白
2022/04/09 数码科技
Vue深入理解插槽slot的使用
2022/08/05 Vue.js