当前位置: 首页 > 工具软件 > GIFEncoder > 使用案例 >

php中如何滚动文字,怎么在PHP中利用GIFEncoder类实现一个滚动字幕

雍河
2023-12-01

怎么在PHP中利用GIFEncoder类实现一个滚动字幕

发布时间:2020-12-23 15:15:19

来源:亿速云

阅读:53

作者:Leah

怎么在PHP中利用GIFEncoder类实现一个滚动字幕?很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。

文字滚动分为两种情况。第一种为水平滚动:

复制代码 代码如下:

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:

复制代码 代码如下:

/*

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

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:

复制代码 代码如下:

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 );

}

}

?>

看完上述内容是否对您有帮助呢?如果还想对相关知识有进一步的了解或阅读更多相关文章,请关注亿速云行业资讯频道,感谢您对亿速云的支持。

 类似资料: