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不用gd库生成当前时间的png格式图象的程序

不用GD库生成当前时间的PNG格式图象的程序  
该程序是不用GD库可以生成当前时间的PNG格式图象,给人大开眼界,很有参考价值. teaman整理

<?php
        
    
function set_4pixel($r, $g, $b, $x, $y)
    {
    global
$sx, $sy, $pixels;

    
$ofs = 3 * ($sx * $y + $x);
    
$pixels[$ofs] = chr($r);
    
$pixels[$ofs + 1] = chr($g);
    
$pixels[$ofs + 2] = chr($b);
    
$pixels[$ofs + 3] = chr($r);
    
$pixels[$ofs + 4] = chr($g);
    
$pixels[$ofs + 5] = chr($b);
    
$ofs += 3 * $sx;
    
$pixels[$ofs] = chr($r);
    
$pixels[$ofs + 1] = chr($g);
    
$pixels[$ofs + 2] = chr($b);
    
$pixels[$ofs + 3] = chr($r);
    
$pixels[$ofs + 4] = chr($g);
    
$pixels[$ofs + 5] = chr($b);
    }
    
//生成数字图象的函数     
    
function draw2digits($x, $y, $number)
    {
    
draw_digit($x, $y, (int) ($number / 10));
    
draw_digit($x + 11, $y, $number % 10);
    }
         
    function
draw_digit($x, $y, $digit)
    {
    global
$sx, $sy, $pixels, $digits, $lines;
             
    
$digit = $digits[$digit];
    
$m = 8;
    for (
$b = 1, $i = 0; $i < 7; $i++, $b *= 2) {
        if ((
$b & $digit) == $b) {
        
$j = $i * 4;
        
$x0 = $lines[$j] * $m + $x;
        
$y0 = $lines[$j + 1] * $m + $y;
        
$x1 = $lines[$j + 2] * $m + $x;
        
$y1 = $lines[$j + 3] * $m + $y;
        if (
$x0 == $x1) {
            
$ofs = 3 * ($sx * $y0 + $x0);
            for (
$h = $y0; $h <= $y1; $h++, $ofs += 3 * $sx) {
            
$pixels[$ofs] = chr(0);
            
$pixels[$ofs + 1] = chr(0);
            
$pixels[$ofs + 2] = chr(0);
            }
        } else {
            
$ofs = 3 * ($sx * $y0 + $x0);
            for (
$w = $x0; $w <= $x1; $w++) {
            
$pixels[$ofs++] = chr(0);
            
$pixels[$ofs++] = chr(0);
            
$pixels[$ofs++] = chr(0);
            }
        }
        }
    }
    }
         
    
//将文字加入到图象中  
    
function add_chunk($type)
    {
    global
$result, $data, $chunk, $crc_table;

    
// chunk :为层
    // length: 4 字节: 用来计算 chunk  
    // chunk type: 4 字节
    // chunk data: length bytes
    // CRC: 4 字节:  循环冗余码校验
         
    // copy data and create CRC checksum
    
$len = strlen($data);
    
$chunk = pack("c*", ($len >> 24) & 255,
        (
$len >> 16) & 255,
        (
$len >> 8) & 255,
        
$len & 255);
    
$chunk .= $type;
    
$chunk .= $data;

    
// calculate a CRC checksum with the bytes chunk[4..len-1]
    
$z = 16777215;
    
$z |= 255 << 24;
    
$c = $z;
    for (
$n = 4; $n < strlen($chunk); $n++) {
        
$c8 = ($c >> 8) & 0xffffff;
        
$c = $crc_table[($c ^ ord($chunk][$n])) & 0xff] ^ $c8;
    }
    
$crc = $c ^ $z;

    
$chunk .= chr(($crc >> 24) & 255);
    
$chunk .= chr(($crc >> 16) & 255);
    
$chunk .= chr(($crc >> 8) & 255);
    
$chunk .= chr($crc & 255);

    
// 将结果加到$result中
    
$result .= $chunk;
    }


    
//主程序

    
$sx = 80;
    
$sy = 21;
    
$pixels = "";
             
    
// 填充
    
for ($h = 0; $h < $sy; $h++) {
    for (
$w = 0; $w < $sx; $w++) {
        
$r = 100 / $sx * $w + 155;
        
$g = 100 / $sy * $h + 155;
        
$b = 255 - (100 / ($sx + $sy) * ($w + $h));
        
$pixels .= chr($r);
        
$pixels .= chr($g);
        
$pixels .= chr($b);
    }
    }
         
    
$date = getdate();
    
$s = $date["seconds"];
    
$m = $date["minutes"];
    
$h = $date["hours"];
    
$digits = array(95, 5, 118, 117, 45, 121, 123, 69, 127, 125);
    
$lines = array(1, 1, 1, 2, 0, 1, 0, 2, 1, 0, 1, 1, 0, 0, 0, 1, 0, 2, 1, 2, 0, 1, 1, 1, 0, 0, 1, 0);
         
    
draw2digits(4, 2, $h);
    
draw2digits(30, 2, $m);
    
draw2digits(56, 2, $s);
    
set_4pixel(0, 0, 0, 26, 7);
    
set_4pixel(0, 0, 0, 26, 13);
    
set_4pixel(0, 0, 0, 52, 7);
    
set_4pixel(0, 0, 0, 52, 13);

    
// 创建循环冗余码校验表
    
$z = -306674912;  // = 0xedb88320
    
for ($n = 0; $n < 256; $n++) {
        
$c = $n;
        for (
$k = 0; $k < 8; $k++) {
            
$c2 = ($c >> 1) & 0x7fffffff;
            if (
$c & 1) $c = $z ^ ($c2); else $c = $c2;
        }
        
$crc_table[$n] = $c;
    }

    
// PNG file signature
    
$result = pack("c*", 137,80,78,71,13,10,26,10);
         
    
// IHDR chunk data:
    //   width:              4 bytes
    //   height:             4 bytes
    //   bit depth:          1 byte (8 bits per RGB value)
    //   color type:         1 byte (2 = RGB)
    //   compression method: 1 byte (0 = deflate/inflate)
    //   filter method:      1 byte (0 = adaptive filtering)
    //   interlace method:   1 byte (0 = no interlace)
    
$data = pack("c*", ($sx >> 24) & 255,
    (
$sx >> 16) & 255,
    (
$sx >> 8) & 255,
    
$sx & 255,
    (
$sy >> 24) & 255,
    (
$sy >> 16) & 255,
    (
$sy >> 8) & 255,
    
$sy & 255,
    
8,
    
2,
    
0,
    
0,
    
0);
    
add_chunk("IHDR");

    
// 以下不敢乱翻译,请自行参考
    //    scanline:
    //        filter byte: 0 = none
    //        RGB bytes for the line
    //    the scanline is compressed with "zlib", method 8 (RFC-1950):
    //        compression method/flags code: 1 byte ($78 = method 8, 32k window)
    //        additional flags/check bits:   1 byte ($01: FCHECK = 1, FDICT = 0, FLEVEL = 0)
    //        compressed data blocks:        n bytes
    //            one block (RFC-1951):
    //                bit 0: BFINAL: 1 for the last block
    //                bit 1 and 2: BTYPE: 0 for no compression
    //                next 2 bytes: LEN (LSB first)
    //                next 2 bytes: one's complement of LEN
    //                LEN bytes uncompressed data
    //        check value:  4 bytes (Adler-32 checksum of the uncompressed data)
    //
    
$len = ($sx * 3 + 1) * $sy;
    
$data = pack("c*", 0x78, 0x01,
        
1,
    
$len & 255,
    (
$len >> 8) & 255,
    
255 - ($len & 255),
    
255 - (($len >> 8) & 255));
    
$start = strlen($data);
    
$i2 = 0;
    for (
$h = 0; $h < $sy; $h++) {
    
$data .= chr(0);
    for (
$w = 0; $w < $sx * 3; $w++) {
        
$data .= $pixels[$i2++];
    }
    }


    
// calculate a Adler32 checksum with the bytes data[start..len-1]
    
$s1 = 1;
    
$s2 = 0;
    for (
$n = $start; $n < strlen($data); $n++) {
    
$s1 = ($s1 + ord($data[$n])) % 65521;
    
$s2 = ($s2 + $s1) % 65521;
    }
    
$adler = ($s2 << 16) | $s1;

    
$data .= chr(($adler >> 24) & 255);
    
$data .= chr(($adler >> 16) & 255);
    
$data .= chr(($adler >> 8) & 255);
    
$data .= chr($adler & 255);
    
add_chunk("IDAT");

    
// IEND: marks the end of the PNG-file
    
$data = "";
    
add_chunk("IEND");

    
// 列印图象
     
    
echo($result);
?>

//如何调用,其实很简单,将上面存为Timeimg.php
//然后新建一个页面如下:

<html>
    <head>
    <title>test</title>
    <meta http-equiv="Content-Type" content="text/html">
    </head>
    <body>
    <img src="Timeimg.php">  //以图象连接方式调用PHP文件
</body>
</html>