PHP使用GIFEncoder类生成gif动态滚动字幕
发布:smiling 来源: PHP粉丝网 添加日期:2021-03-05 11:57:01 浏览: 评论:0
这篇文章主要介绍了PHP使用GIFEncoder类生成gif动态滚动字幕,文字滚动分为两种情况,一种为水平滚动,一种为垂直滚动,需要的朋友可以参考下。
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 );
- }
- }
- ?>
Tags: GIFEncoder gif动态滚动字幕
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