php不用GD库生成当前时间的PNG格式图象的程序

<?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);

}

}



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